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DC 3rd > 2011 Practice Test > Flashcards

2011 Practice Test Flashcards

1
Q

The component in which liquid vapor by absorbing heat is called?

a. Condenser
b. Compressor
c. Expansion tube
d. Evaporator

A

Evaporator

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2
Q

Select the best answer electrical grounding method?

A

a. Metal stake drive 8 foot into the ground.

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3
Q

A _____ valve should be used for throttling purpose?

a. Globe
b. Ball
c. Gate
d. Check

A

a. Globe

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4
Q

What is the acceptable range for residual sodium sulfite in the boiler maintain?
A. 15-30
B. 20-40
C. 30-70
D. 40-80

A

C. 30-70

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5
Q

What is the BTU content of a gallon of #4?
a. 141,000
b. 148,000
c. 146,000
d. 150,000

A

c. 146,000

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6
Q

What does a zeolite water softener system use as a means of regeneration?
a. salt
b. Hot water
c. Cold water
d. Brine

A

d. Brine

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7
Q

What are the 4 steps for a Zeolite Rejuvenation water softener process?

A

a. Back wash
b. Brine
c. Fast rinse
d. Brine tank refill/Service

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8
Q

Where is medium temperature liquid found?

A

a. Condenser

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9
Q

Where is high temperature vapor found?

A

a. At the discharge of the compressor or condenser

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10
Q

What stays are used to support the burner chamber in a scotch marine boiler?
a. Grinder stay
b. Diagonal Stays
c. Through Stays
d. Palm Stay

A

b. Diagonal Stays

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11
Q

Name the wire that connects all component of a system to a physical ground or water pipe?

A

a. Grounding Electrode Conductor

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12
Q

On the boilers that have both Quick opening and Screw type blow down valves, the Quick
opening valve must be located?

A

a. Closest to the boiler and followed by the screw type valve

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13
Q

High pressure boilers equipped with Quick opening and Screw type valves are blown down how?

A

a. By opening the Quick opening valve first and closing it Last

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14
Q

ASME Code defines a slow opening valve as what?

A

a. One requiring at least 5 full 360 degree turns between full open and close position

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15
Q

During a 24 hours operation how often should you check the water level?

A

Once per shift

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16
Q

How often you checking the high limit switch?

A

Annually

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17
Q

What is the recommended time for a complete external inspection of a boiler?

A

Once per shift

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18
Q

What is the first thing to do when shutting down a boiler?

A

Turn of the fire

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19
Q

A flow control should be blown down when?

A

Once per shift

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20
Q

How often should you check the Low Water Fuel Cut off?

A

Once per shift

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21
Q

Why is oil added to the refrigerant?

A

a. To lubrication of the compressor
b. Keep refrigerant migrating

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22
Q

Recycled and filtered refrigerant can be used where?

A

By the same owner in the same type of equipment

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23
Q

Data printed on the equipment nameplate would include manufacturer, model, and serial
number and________________?

A

a. Stamp of approval from commissioning authority

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24
Q

How many BTU does it take to raise 10 lbs of steam from 40 to 41 degrees?

A

a. 1 BTU

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25
Q

When working on a boiler permits should be required?

A

a. For every shift

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26
Q
  1. How many things do safety controls protect against?
A

a. Over pressure
b. Over Heating
c. Fire side explosions

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27
Q

What chemical compounds in water cause permanent hardness?

A

a. Calcium Sulfate and Magnesium Silicate

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28
Q

What chemicals are used to combat corrosion?

A

a. Sodium Sulfite and Hydrazine

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29
Q

You have boiler water that is found to have a PH of 5. What compound do you add to
neutralize?

A

a. Bases

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30
Q

What produces soft scale?

A

a. Calcium Carbonate and Magnesium Carbonate

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31
Q

With normal oxygen and low alkalinity, what is added to boiler water?

A

a. Neutralizing Amines

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32
Q

What is hard forming scale?

A

a. Silica

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33
Q

Which chemicals are used to combat scale?

A

a. Combined Phosphate Treatment

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34
Q

Which compound not heat produce?

A

a. Nitrogen

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35
Q

What takes no actual action in combustion?

A

a. Nitrogen

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36
Q
  1. With hydroxide present and normal oxygen levels which chemical will cause problem?
A

a. Chlorine

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37
Q

What mechanical device is used to remove scale from Fire Tubes?

A

a. A Tube Rattler or Vibrator is used

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38
Q

Who can make Adjustments or repairs on a Safety Valve?

A

a. Qualify person from Manufacturer or Representative

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39
Q

What mechanical device is used to remove scale from water Tubes?

A

a. A Tube Turbine is used

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40
Q

In a duct air handling system, space thermostat control building temperatures by?
a. Resetting the air handler hot & cold deck temperature
b. Mixing the air from the hot & cold deck at the air handler
c. Control a reheat coil located in the duct serving the space
d. Mixing the air from hot & cold duct in a mixing box serving the space

A

d. Mixing the air from hot & cold duct in a mixing box serving the space

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41
Q

The removal of moisture from air using a cooling coil is called _________ dehumification?
a. Active
b. Passive
c. Desiccant
d. Mechanica

A

b. Passive

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42
Q

In a multi-zone air handler unit, the zone thermostat controls the zone temperature by?
a. Varying the air volume to the zone
b. Reset of the hot & cold deck supply temperatures
c. Modulating the heating and cooling coil control valve
d. Dampers that control the air flow from the hot & cold deck

A

d. Dampers that control the air flow from the hot & cold deck

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43
Q

An air handler unit that has hot & cold air ducts connected to (molding boxes?) located in each building space is called a __________air handler unit?
a. Dual duct
b. Multi zone
c. Single zone
d. Terminal reheat

A

a. Dual duct

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44
Q

An air handler unit supplies a constant supply air temperature of 55 degree F to building spaces and includes a coil called _____air handler unit?
a. A vav
b. An induction
c. A terminal reheat
d. A constant volume

A

c. A terminal reheat

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45
Q

An air handler unit that provides heating, cooling, ventilation, and air conditioning to more than
one building or area and has its cooling & heating Coil in separate side-by side ducts is called a
_______air handling unit?
a. Dual duct
b. Multi zone
c. Single zone
d. Terminal

A

b. Multi zone

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46
Q

In a dual duct air handling system space thermostatic control building temperature by?
a. Resetting the air handler hot & cold duct temperature
b. Moving the air from the hot & cold deck at the air handler
c. Controlling a reheat coil located in the duct serving the space
d. Moving the air from the hot & cold duct in a molding box serving the space

A

d. Moving the air from the hot & cold duct in a molding box serving the space

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47
Q

A boiler is rated at (86,250 lbs, 88,250 lbs, 96,250 lbs) of steam per hour. What is the
equivalent boiler horsepower?
a. 750
b. 1500
c. 2500
d. 3500

A

c. 2500 HP = 86,250 / 34.5 = 2500 lbs

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48
Q

Total Force

A

TF = Pressure x Area

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49
Q

What is the total force acting on a 4 inches diameter safety value disc with a boiler pressure of
12 psi?
a. 125.50
b. 150.79
c. 176.03
d. 193.90

A

b. 150.79

TF = P x A

TF = P x ( d x d x 0.7854)

TF = 12 x 4 x 4 x 0.7854

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50
Q

The expansion tank on a closed loop system should be located?
a. On the suction side of the pump
b. At the lowest point of the system
c. At the highest point of the system
d. On the discharge side of the pump

A

a. On the suction side of the pump

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51
Q

What is the primary purpose of a crank case heater on a reciprocating chiller?
a. To heat condensate water
b. To prevent refrigeration migration
c. To prevent thickening of lubricant
a. To add false load in low condition

A

b. To prevent refrigeration migration

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52
Q

What is meant by the percent of (skip, step, and slip) in a pump?
a. Difference in the efficiency of the drive motor
b. Capacity of the pump at its peak horsepower
c. Difference of flow compared minimum speed and full speed
d. Percentage of flow compared minimum speed and full speed
e. The difference in theoretical capacity compared to the actual capacity

A

d. Percentage of flow compared minimum speed and full speed

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53
Q

Which of the following types pump can be started with the discharge value closed?
a. Gear
b. Vane
c. Rotary
d. Centrifugal

A

d. Centrifugal

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54
Q

The vertical distance from the center line of the pump up to top level of the supply tank is
called?
a. Friction head
b. Total dynamic head
c. Static suction head
d. Static discharge head

A

c. Static suction head

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55
Q

Where in a system is a foot valve value installed and what is its purpose?
a. A value operated by your foot in order to prime a centrifugal pump ____ operation
b. A value providing a cushion effect on a positive displacement pump _____ minimum the
pulsations created by each stroke.
c. An automatic value located on the discharge side of the pump which opens when the outlet
pressure overcomes the static head pressure.
d. A type of check value located below the normal level of the tank _____ attached to the end
of the suction line of the pump, used to keep _____ suction line full to facilitate starting.

A

d. A type of check value located below the normal level of the tank _____ attached to the end
of the suction line of the pump, used to keep _____ suction line full to facilitate starting.

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56
Q

What is meant by a pump becoming steam bound?
a. When the feed water to the pump is too cold, causing cavitations
b. When the volume impeller rotation changers the pressure head to velocity head
c. When the pump’s discharge is equal to the pressure in the boiler, causing a high water
condition.
d. When the static pressure at the suction of the pump falls below the vapor pressure
corresponding to its temperature.

A

d. When the static pressure at the suction of the pump falls below the vapor pressure
corresponding to its temperature.

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57
Q

In a multi-zone air handling unit, the zone thermostat controls the zone temperature by?
a. Varying the air volume to the zone
b. Reset of the hot & cold deck supply temperatures
c. Modulating the heating & cooling coil control value
d. Dampers that control the air flow from the hot & cold deck

A

d. Dampers that control the air flow from the hot & cold deck

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58
Q

Which of the following is a positive displacement pump?
a. Jet
b. Propeller
c. Centrifugal
d. Reciprocating

A

d. Reciprocating

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59
Q

What does the whistle on the top of the water column indicating?
a. High water condition ( only )
b. Low water condition ( only )
c. High and low water condition
d. Gauge glass has clogged and become inaccurate

A

c. High and low water condition

60
Q

The heart of a refrigeration system is the _______?
a. Compressor
b. Liquid pump
c. High side float
d. Metering device

A

a. Compressor

61
Q

Refrigerant flow into the evaporator is controlled by ___________?
a. Head pressure
b. The compressor
c. A metering device
d. Condenser liquid level

A

c. A metering device

62
Q

A reciprocating compressor operating with refrigerant R-410 head pressure of 476 psi and a suction pressure of 118 psi. What is the compressor’s compression ratio?
a. 3.7
b. 4
c. 5
d. 6

A

b. 4

476 + 14.7 / 118 + 14.7 = 3.760

63
Q

The part of the refrigeration system that absorbs heat into the system is controlled by the
______?
a. Absorber
b. Condenser
c. Evaporator
d. Heat exchanger

A

c. Evaporator

64
Q

A replacement refrigerant for R-12 medium and high temperature refrigeration application is
_____?
a. 123 A
b. 134 A
c. 407 C
d. 410 A

A

b. 134 A

65
Q

The color for an R-134 a refrigerant cylinder is _______?
a. Green
b. Dark Blue
c. Light Blue
d. Chocolate

A

c. Light Blue

66
Q

. The color for an R-410 a refrigerant cylinder is _______?
a. Rose
b. Green
c. White
d. Dark Blue

A

a. Rose

67
Q

Which of the following is a hanged joint between two or more _____ furnace and may be located in the center of the furnace, with _______ than 18-inches an apart?
a. Stay ring
b. Dish back
c. Morrison ring
d. Adamson ring

A

d. Adamson ring

68
Q

Which of the following statement is true concerning fire tube and water tube boilers?
a. A water tube boiler’s biggest advantage over a fire tube boiler___? ____flexibility to increase
capacities and pressure.
b. In a fire tube boiler, the water circulates through the tubes and ____? _____ Water tube
boiler the water circulates outside the tubes.
c. In most water tubes boilers, the tubes are contained within the ____? ______ Boiler allowing
for added water and steam circulation.
d. A fire tube boiler has an advantage over a water tube because ____? ______ Construction
of the boiler enables the use for utility-steam ____? _____.

A

a. A water tube boiler’s biggest advantage over a fire tube boiler, flexibility to increase capacities and pressure.

69
Q

A chief engineer preparing for mud drum inspection, which of the following will you not do?
a. Prepare fans for fresh air
b. Lock and tag out blow down valves
c. Wear goggles and mask
d. Set up a 110 volt lighting for inspection

A

d. Set up a 110 volt lighting for inspection

70
Q

What do you use to bank off a boiler and bring it back online without using the shut off valve?
a. Ball valve
b. Pilot
c. Automatic stop valve

A

c. Automatic stop valve

71
Q

What is not advantage of an economic boiler over a conventional HRT Boiler?
a. Space, ability to increase capacity, flexibility,
b. More brick needed.
c. Can be shipped as a unit
d. More heating square foot

A

a. Space, ability to increase capacity, flexibility

72
Q

. What do you call the chemicals are used to test water treatment test for hardness is?
a. Reagents
b. Test chemicals
c. Titration test
d. Hardness Titrant test

A

a. Reagents

73
Q

What are the three “T”s of combustion stand for?

A

a. Time, Temperature, Turbulence

74
Q

What do you do to attain complete combustion in a boiler?
a. Increase primary air
b. Increase secondary air
c. Decrease fuel supply
d. Increase excess air

A

b. Increase secondary air

75
Q

Air leaking into the inner and outer of the boiler, what will happen?
a. Decrease boiler efficiency
b. Increase stack temperature
c. Tubes uses excess air for complete combustion

A

a. Decrease boiler efficiency

76
Q

By clicking on the exibit the picture is a display of (page 365 BOG)?
a. Cross section of control chamber
b. Full nozzle reaction type safety valve
c. Adjusting ring

A

b. Full nozzle reaction type safety valve

77
Q

What controls the steam pressure and monitors the combustion air intake?
a. Discrete, Analog, and DDC
b. Analog
c. Fuel, air, water
d. All of the a above

A

c. Fuel, air, water

78
Q

What happens to the water in a boiler that is at 80% load of a sudden, the flame goes off?
a. Water will shrink and swell
b. Water will shrink and cause a low water condition
c. Water will swell and create a high water condition
d. No effect on the water

A

b. Water will shrink and cause a low water condition

79
Q

What is installed between the boiler drum and the steam gauge to create a water seal
protection for the gauge?
a. Siphon
b. Valve
c. Gauge
d. Both A & B

A

a. Siphon

80
Q

What is the replacement refrigerant for R-22?
a. R-12
b. R-11
c. R-410 A
d. R-134 A

A

c. R-410 A

81
Q
  1. Which valves to the boiler is opened ______ and ______ during blow down?
    a. By opening the Quick opening valve first and closing it Last.
    b. Last, First
    c. Second and First
A

a. By opening the Quick opening valve first and closing it Last.

82
Q

How and why tube ends on a fire boiler are secure?
a. Tube ends are flare to keep them pulling apart
b. Tube ends are flare to provide more efficient water circulation
c. Tube ends are beaded to keep the tube ends cool from the heat furnace
d. Tube ends are beaded to allow for greater expansion and control the tubes

A

d. Tube ends are beaded to allow for greater expansion and control the tubes

83
Q

What is not an advantage of the economic type boiler over the conventional type boiler?
a. Required amount of brickwork is less
b. Boiler may be shipped as a complete unit
c. Allows greater flexibility expansion and contraction
d. Provides a greater heating surface areas per square foot

A

c. Allows greater flexibility expansion and contraction

84
Q

An accelerated circulation water tube in one characterized by?
a. A booster pump
b. Heated down comers
c. External down comers
d. Internal circulating tubes

A

b. Heated down comers

85
Q

What is platinum used in RTD (Resistive temperature Device)?

A

Because of its stability at high temperature

86
Q

In a HVAC system’s, controlled by thermostat, the difference is the difference between
The?
a. Set point and the temperature at which the switch turns the systems on
b. Temperature at which the switch turns the systems on and the temperature at which
it Turns it off
c. Set point and the temperature at which the switch turns the systems off
d. Set point and the temperature at which the heat anticipator begins to produce heat

A

c. Set point and the temperature at which the switch turns the systems off

87
Q

What is the purpose of a suction accumulator?
a. It prevent moisture that condenses on refrigerant lines from getting in the
compressor
b. If filter out solid particles from refrigerant flowing through the suction line
c. It contains liquid refrigerant to allow evaporation prior to entering the compressor
d. It absorbs any moisture that may have contaminated the refrigerant flowing through a Suction line

A

c. It contains liquid refrigerant to allow evaporation prior to entering the compressor

88
Q

What must be submitted to the code official when field assembly of boilers is required?
a. Certification of completion
b. Boiler inspection report
c. Ansi testing document
d. U‐1 Manufacture’s data report

A

b. Boiler inspection report

89
Q

A boiler has 2800 furnaces temperature and 600 stack temperatures reading. What is
The boiler efficiency? (Page 646 BOG)
a. 44.4
b. 56.7
c. 78.57
d. 100.8

A

c. 78.57 Input ‐ loss divided by input x 100 2800 – 600 x 100 = 78.57

90
Q

What do you call a reading from the center point of an impeller across to the gauge?
a. Static pressure
b. Head pressure
c. Static inlet pressure
d. Status Suction

A

a. Static pressure

91
Q

What is the Heart of a refrigeration system?
a. Evaporator
b. Condenser
c. Compressor
d. Metering Device

A

c. Compressor

92
Q

Which coal has the biggest level of fixed carbon content?
a. Anthracite
b. Bituminous
c. Semi‐bituminous
d. Lignite

A

a. Anthracite = 14,000

93
Q

What is the cause of high excess in a condensate return tank with temperature up to 20
Degrees above normal?
a. Steam traps are stuck open
b. Less condensate in system
c. Re‐heater does not work

A

a. Steam traps are stuck open

94
Q

Water inlet into a building is 100 psig, if no booster pumps are used. What will be the
Pressure on the 10th floor, if the building is 10 feet per floor?
a. 43.3
b. 44.4
c. 56.7
d. 100.8

A

a. 43.3 2.31 = 1 psi, 100 psi = 100/2.31 = 43.3 psi

95
Q

Where is the total hardness of a softener reading .5 grains?

A

a. ( 17.1 x .5 = 8.6 )

96
Q

How many BTUs are raise 2 lbs of water from 32F to 212F?
a. 180 btu
b. 360 btu
c. 970 btu
d. Other

A

b. 360 btu 180 – 32 = 218 x 2 = 360btu

97
Q

A stoker that uses a feed RAM is a?
a. Underfeed stoker
b. Over feet stoker
c. A chain grate feeder
d. None of the

A

a. Underfeed stoker

98
Q

Water scales can be removed by boiling or raising water temperature is?
a. Calcium
b. Magnesium
c. Temporary
d. Non‐Carbonated Salts

A

c. Temporary

99
Q

What is the proper way of testing a safety valve?
a. Allow pressure to build up to 75% before lifting the test level
b. Allow pressures to rise up to 20%
c. Never test a safety valve

A

a. Allow pressure to build up to 75% before lifting the test level

100
Q

What a safety valve discharge, it should relieve the boiler so that the pressure does not
Exceed more than ______?
a. 1%
b. 6%
c. 5%
d. 10%

A

b. 6%

101
Q

When conducting an evaporation test, the operator must secure what?
a. The flame to the burner
b. The feed water to the boiler
c. The power to the boiler

A

b. The feed water to the boiler

102
Q

What steam trap has one movable device that rises to allow steam through and resets
On condensate?
a. Thermodynamic
b. Thermostatic trap
c. Inverted Bucket trap
d. Float trap

A

d. Float trap

103
Q

What part in a refrigeration cycle discharges, high temperature pressure of vapor?
a. Condenser
b. Compressor
c. Evaporator
d. Metering Device

A

b. Compressor

104
Q

What part in a refrigeration cycle discharges low pressure liquid?
a. Evaporator
b. Compressor
c. Condenser
d. Expansion valve

A

d. Expansion valve

105
Q

Proximate analysis reports which of the following?
a. The chemical contents
b. The volatile matter, percent of moisture, fixed carbon and ash

A

b. The volatile matter, percent of moisture, fixed carbon and ash

106
Q

What is that maximum range of pressure settings of all the saturated steam safety
Valves on boilers?
a. 3 % of the highest set valve
b. 6% of the highest set valve
c. 10% of the highest set valve
d. 12% of the highest set valve

A

c. 10% of the highest set valve

107
Q

What type of valve would you use nearest the boiler in a blow down line?
a) quick opening
b) slow opening
c) either quick or slow opening
d) globe valve

A

a) quick opening

108
Q

What type of valve would you use to control blow down?
a) quick opening
b) slow opening
c) both
d) a butterfly valve

A

b) slow opening

109
Q

How is a boiler hydrostatic test performed?
a) the same way an accumulation test is performed
b) fill the boiler with 70ºF of water and raise the pressure to 1.5 MAWP
c) fire the oiler to max pressure
d) fill with water and raise to no more than 6% MAWP

A

b) fill the boiler with 70ºF of water and raise the pressure to 1.5 MAWP

110
Q

A 3 element feed regulator senses what to control water flow?
a) air pressure, water level, steam pressure
b) water level, steam flow, water flow
c) steam pressure, steam flow, water level
d) water pressure, steam flow, water level

A

b) water level, steam flow, water flow

111
Q

On/off controls that activate devices using a one variable (i.e. pressure) are called?
a) analog controls
b) discrete controls
c) telemetry controls
d) digital control

A

b) discrete controls

112
Q

Controls which use a quantity measured over a range of dynamic values are?
a) analog
b) discrete
c) telemetry
d) digital

A

a) analog

113
Q

What type of valve would not be a good choice if sediment is present in a system?
a) quick closing
b) gate valve
c) OS&Y gate
d) globe valve

A

d) globe valve

114
Q

A proximate analysis of coal will not report what?
a) percent of moisture
b) fixed carbon
c) percent of various chemical elements
d) ash

A

c) percent of various chemical elements

115
Q

Boiler shall be designed and constructed in accordance with?
a) UL 726
b) UL 834
c) ASME CSD‐1
d) all of the above

A

c) ASME CSD‐1

116
Q

Discrete control when used for steam pressure is what type of control?
a) analog
b) on/off
c) stop/go
d) b and c

A

d) b and c

117
Q

The purpose of the condenser in a refrigerant system is to
a) cool the refrigerant gas
b) change the refrigerant vapor a liquid state
c) change the refrigerant liquid into a vapor
d) filter out the moisture

A

b) change the refrigerant vapor a liquid state

118
Q

The __ is where the liquid refrigerant turns to gas and absorbs latent heat
a) condenser
b) compressor
c) filter drier
d) evaporator

A

d) evaporator

119
Q

The __ removes moisture from a refrigeration system
a) condenser
b) compressor
c) filter drier
d) evaporator

A

c) filter drier

120
Q

The oil in a refrigeration system is used for
a) lubrication
b) cooling and lubrication
c) cooling
d) cooling lubrication and filtration

A

b) cooling and lubrication

121
Q

When is a pump steam bound?

A

a. Steam bound indicates the water is too hot for the suction of the pump, and the
water flashes into steam with reduction of pressure.

122
Q

Which condition is a boiler not protected against?
a) under pressure
b) overpressure
c) overheating
d) fireside explosion

A

a) under pressure

123
Q

Which by product has the lowest heating value?
a) coke oven
b) coal gas
c) blast furnace gas
d) sewer gas

A

c) blast furnace gas

124
Q

What is the last protection against overheating in a boiler?
a) LWCO
b) safety valve
c) high temperature cut out switch
d) flame safeguard

A

a) LWCO

125
Q

In an open type expansion tank how high should the tank be mounted?
a) at least 6 feet above the highest heating element
b) at least 4 feet above the highest heating element
c) at least 8 feet above the highest heating element
d) at least 5 feet above the highest heating element

A

b) at least 4 feet above the highest heating element

126
Q

Which element does not take an actual action in the combustion process?
a) carbon
b) nitrogen
c) hydrogen
d) oxygen

A

b) nitrogen

127
Q

mmediately after a repair to a refrigeration system what is used to remove moisture
From the system?
a) Compressor
b) evaporator
c) vacuum pump
d) air filter

A

c) vacuum pump

128
Q

The boiler steam line is 450 feet long. During start up the pipe is heated from 70F to
360F. how many inches the pipe will expand?

a. 13.50
b. 11.58
c. 10.18
d. 12.5

A

c. 10.18

129
Q

What would you add to a boiler, if you are needed to the protect the refractory from
Excess heat and to increase the capacity of the boiler?
a. Down comer tubes
b. Steam tubes
c. Riser tubes
d. Water wall tube

A

c. Riser tubes

130
Q

A condensate tank has a lot of steam existing from its vent it is registering 20 F higher
Than normal. What could be the reason?
a. Heaters failing open
b. Steam trap failing open
c. High water condition in the boiler
d. Low condensate level

A

b. Steam trap failing open

131
Q

What kind of valve allows a boiler to be “cut in online” when the main isolation valve is
Open or closed?
a. Automatic check valve
b. Pilot gate valve
c. Stop check valve
d. Globe valve

A

c. Stop check valve

132
Q

In a siphon, what is the water seal between the boiler and the pressure controls called?
a. Water glaze
b. At temperature water
c. Apparatus water
d. Condensate

A

d. Condensate

133
Q

area of a circle?

A

A = (D² X 0.7854)

134
Q

volume of a cylinder

A

V = Area of a circle X High or Length.

135
Q

What is the normal sodium sulfite in a boiler?
a. 20-40
b. 20-60
c. 40-60
d. 60-100

A

a. 20-40

136
Q

Where is the cooling tower bleed line?
a. Return line
b. Supply line
c. Drain line
d. Other

A

c. Drain line

137
Q

Plume discharges from the cooling tower shall not less than?
a. 5 feet
b. 10 feet
c. 20 feet
d. 50 feet

A

a. 5 feet

138
Q

How is fire tube in a boiler secured?

A

a. To the tube sheet

139
Q

What kind of steam trap has a simple float/disc that lifts?
a. Inverted bucket
b. Float thermostatic
c. Thermostatic
d. Thermodynamic

A

a. Inverted bucket

140
Q

What type of maintenances practiced when a piece of equipment is allowed to
Run until it fails?
a. preventive
b. Predicative
c. Breakdown
d. Engineered

A

c. Breakdown

141
Q

The height in feet of a liquid above a point such as pump suction is?
a) pressure head
b) static head
c) friction head
d) velocity head

A

b) static head

142
Q

In the design of a water tube boiler the?
a) water circulate around the tubes
b) water circulates around the tubes and the gases of combustion go through the tubes
c) gases of combustion pass over the tubes and the water circulates through the tubes
d) the lower drum contains a steam and water mixture

A

c) gases of combustion pass over the tubes and the water circulates through the tubes

143
Q

Which of the following methods are used to support large furnaces in a SM boiler?
a) installing stay bolts between the furnace and the outer shell
b) corrugating the furnace walls
c) dividing the furnace length into sections with a stiffening flange or welded stiffening
rings
d) any of the above methods may be used

A

d) any of the above methods may be used

144
Q

What is the safety factor of 1200 psi, and the maximum pressure is 200 psi?
a. 5.5
b. 6.0
c. 6.5
d. 7.0

A

b. 6.0 1200 psi / 200 psi = 6.0 psi

145
Q

What jumper is used to connect the neutral and ground?
a. Natural Jumper
b. Insulated Jumper
c. Main Bonding Jumper
d. Equipment Grounding Conductor

A

c. Main Bonding Jumper

146
Q

Every discharge pipe on a safety valve should be at least?
a. 12 feet high
b. 6 feet high
c. 3 feet high
d. Above the highest area of the boiler

A

b. 6 feet high

147
Q
A

DC 3rd (4 decks)

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