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Chief 6 Flashcards

1
Q

When attempting to determinethe proper size for a boiler feed pump it is advisable to obtain one capable of delivering

A

One cubic foot of water for every boiler horsepower

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2
Q

A zeolite water softener exchanges calcium and magnesium ions for

A

Sodium ions

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3
Q

The motor out of rotary cup oil burner drives the atomizing cup at a speed of

A

3450 rpm

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4
Q

The proper amount of CO2 when using number six oil is

A

14%

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5
Q

The best type of flame detection device to use on a multiple oil burner systems would be

A

Ultraviolet

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6
Q

The pressure at the base of a column of water 125 ft high will be

A

54.25psi

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7
Q

The temperature of the air surrounding a 40° C electric motor is 65° f. What is the ambient temperature

A

65° f

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8
Q

Cavitation is more likely to occur in a

A

Centrifugal pump

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9
Q

The maximum time allowed for trial of ignition on an oil burner with the minimum firing rate is

A

90 seconds

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10
Q

Normal furnace draft found in oil fired boilers is

A

.05 to 1.0 inches of water

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11
Q

The proper amount of CO2 present when using natural gas is

A

10%

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12
Q

A scale pocket is most often on

A

The bottom of a riser

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13
Q

The most widely accepted test method used to determine the viscosity of the various grades of fuel oil is the

A

Saybolt universal viscosimeter

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14
Q

The component present in greatest amount by weight number six fuel oil is

A

Carbon

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15
Q

The most highly toxic of the following refrigerants is

A

Sulfur dioxide

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16
Q

On induced draft fan connected is between the

A

Stack and the breeching

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17
Q

If the temperature of the condensate returning to the vacuum pump in a low pressure steam vacuum heating system is above 180° f the trouble may be caused by

A

Faulty radiator traps

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18
Q

Which of the following is not on the low side of refrigeration system

A

Liquid seal

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19
Q

When the temperature of water that is to be pumped rises from 150° f to 200° f the suction lift of the pump will

A

Decrease

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20
Q

Want to duplex system pump dimension is given as 3x 2x3 the third figure usually refers to the

A

Length of the stroke

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21
Q

115 volt hot water heater has resistance of 5.75 ohms the current it will take at rated voltages

A

20 amps

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22
Q

When it is necessary to add chemicals to a heating boiler it should be done

A

At a time when there is heavy flow of condensate to the boiler

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23
Q

An open feed water heater is located

A

Ahead of the feed pump

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24
Q

If a Fahrenheit thermostat registered a hundred degrees Fahrenheit what would be the reading on a Celsius scale

A

37.7 C

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25
Q

Specific gravity can be measured by the use of a

A

Hydrometer

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26
Q

Modern electric motors are considerably smaller than older motors of the same horsepower because of the use of

A

Thinner insulation

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27
Q

The pitch rivets in a boiler seem joint is the

A

Distance between center lines of adjacent rivets

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28
Q

Approximately how many feet would a boiler to be if it measured 3 meters long

A

9.85

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29
Q

An elliptical manhole opening in a water tube boiler shall not be less than

A

160 square inches

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30
Q

The largest size safety valve would have a diameter of

A

5 in

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31
Q

Ammonia system condenser tubes are usually constructed of

A

Steel

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32
Q

The corrosive action of the flu gases in an oil-fired boiler would be more noticeable if the flu gas temperature was

A

Decreased

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33
Q

One of the most popular types of wet back water boilers is a

A

Scotch Marine

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34
Q

One firetube boiler cannot be taken out of service already great length of time to permanently repair an interior tube leak a boiler inspector may allow

A

The use of a tube stopper

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35
Q

A globe valve is better suited for

A

Application requiring frequent operation

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36
Q

The lower the vacuum maintained in a vacuum heating system the easier it is to control the steam distribution true or false

A

False

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37
Q

It is possible to operate a steam heating system with a pressure lower than atmospheric pressure

A

True

38
Q

A fusible plug is a fire actuated device that melts away a tin core at 400 to 500 degrees

A

True

39
Q

Brian can be used as a primary refrigerant

A

False

40
Q

New York State industrial code rules require 2 water gauge glasses on boilers operating at a pressure above 400 PSI

A

True

41
Q

Ammonia requires a greater displacement than Freon number 12 two produce one ton of refrigerant

A

False

42
Q

If the air is cooled from 80° to 40°, Fahrenheit it’s moisture content increases

A

False

43
Q

There is very little difference between a DC motor and a DC generator for many uses they are easily interchanged

A

True

44
Q

Spawling is the formation of lions or pits found in piping caused by dissolved gases

A

False

45
Q

There are 144 cubic inches in a cubic foot

A

False

46
Q

The ringleman chart is used for flue gas analysis

A

False

47
Q

A pump will not handle hot water from below the pump level but will handle hot water supplied from above it

A

True

48
Q

Low pressure steam or an electric heater is required for heating number six fuel oil

A

True

49
Q

The carbon monoxide content in the flu gas from an efficiently fired boiler should be approximately zero percent

A

True

50
Q

On electrostatic precipitator is used to remove particles from flu gases

A

True

51
Q

on arbitrary index combining the effects of temperature humidity and movement in an air conditioning is called effective temperature

A

True

52
Q

A compound gauge is one that measures both air and steam pressure

A

False

53
Q

it is considered good practice in the care and operation of a steam boiler to use hot water whenever possible in refilling a boiler prior to firing

A

True

54
Q

Flooding of a boiler could be caused by the formation of scale on the seats of a float operated boiler supply valve

A

True

55
Q

Suit usually accumulates on the outside surface of the tubes in an HRT boiler

A

False

56
Q

A dead weight test her is used to calibrate steam gauges

A

True

57
Q

After a suit blowing operation the flu gas temperature should be higher

A

False

58
Q

Water tube boilers are faster steamers than fire tube boilers because they contain larger heating surfaces

A

True

59
Q

according to the asme code a boiler becomes a high temperature hot water boiler when the pressure exceeds 160 PSI and the temperature is in excess of 250° f

A

True

60
Q

If you were to conduct a hydrostatic test on a high pressure boiler who is normal operating pressure was 225 PSI you would need a test pressure of 300 PSI

A

False

61
Q

The formation of ice on the expansion coils of on ammonia unit can assist in the cooling of the space

A

False

62
Q

A refrigeration condenser will work more efficiently if the pressure is reduced on the gas or vapor to be condensed

A

False

63
Q

If the suction pressure of a steam is increased the horsepower per ton of refrigeration is generally increased

A

False

64
Q

The higher the temperature of the condensing water the more efficient the condenser can operate

A

False

65
Q

The higher the discharge pressure the higher the horsepower required per ton of refrigeration

A

True

66
Q

The liquid receivers on dry systems are generally larger than those used on flooded systems

A

False

67
Q

A pressure type expansion valve should be located at the inlet connection of the cooling unit

A

True

68
Q

The thermostatic type of refrigeration control is most likely found in domestic units

A

True

69
Q

On accumulation of ice on the evaporator coils tends to increase the suction pressure

A

True

70
Q

Ammonia is generally used as the refrigerant in theaters schools and public buildings

A

False

71
Q

Essay scale-is the problem of scale greater greater and high pressure boilers or low pressure boilers explain your answer

A

High pressure because the higher temperature of the boiler water bakes the scale onto the tubes and shell

72
Q

I say what is meant by the statement that an oil burner has an eight to one turn down ratio

A

If the burner burned 80 gallons per hour on high fire it would burn 10 gallons per hour on low fire

73
Q

Why is an accumulated accumulation test made on a boiler?

A

The accumulation test proves they’re relieving capacity of the boiler safety valve

74
Q

A general rule of thumb is to preheat fuel oil to within —– to —— of its flashpoint.

A

10° f to 20° f

75
Q

Why is it that a pump will not handle hot water from below the level of the pump?

A

The suction side of a pump creates a partial vacuum. if the lift is high and the water is too hot it can cause the water to flash into steam and the pump will become steam bound

76
Q

What is the purpose of a shading coil on a shaded pole induction motor?

A

The shading coil is out of phase with the main winding acting as a phase splitting device to produce rotating magnetic field necessary to self-start induction motors

77
Q

If water is said to be hard what two chemical salts would most likely be found in the water?

A

Calcium carbonate and sulfates and magnesium

78
Q

Which safety valve should blow first the valve on the boiler boiler or the valve on the super heater

A

The super heater valve opens first this ensures a flow of steam through the superheater so that it is not damaged from overheating

79
Q

one of the functions of oil in a large transformer is to help remove the heat developed in the transformer due to electrical losses how is the heat removed from the oil?

A

Cooling tubes and fins where the hot oil loses its heat to the ambient air

80
Q

What occurs when error or moisture comes in contact with this oil

A

Moisture decreases the dye electric properties of the oil it can also form a sludge which coats windings and impedes heat transfer

81
Q

What is used on large transformers instead of air in this space above the oil inside the case?

A

Nitrogen

82
Q

Name two disadvantages of using steam atomization in conjunction with an oil burner?

A

Loss of treated boiler water loss of heat BTUs in the steam used to atomize the oil

83
Q

What is caustic embrittlement and what causes it?

A

Weakening of the boiler steel due to intercrystalline cracks it is caused by boiler water that is too high in alkalinity and also stress

84
Q

What is the function of the expansion tank in a hot walked her heating system?

A

It provides for expansion and contraction of the system as it is heated and cooled makeup water is added here excess system air is removed here

85
Q

What is the main disadvantage of using an infrared LED sulfide flame detection system?

A

Because it can read glowing refractory like it is a flame when this occurs when and burner is trying to light it will shut the burner down nuisance shutdown

86
Q

list the three most important steps necessary to convert a high pressure steam heating system to a low pressure steam heating system

A

Change traps change safety valve tool larger size larger piping

87
Q

Name two conditions which would cause a centrifugal pump to fail to pump water

A

A worn pump slippage water that is too hot and or too high a suction lift

88
Q

Which is found closest to the stack in the path of the furnace gases on economizer or preheater and why

A

The air preheater. The hottest gas is passed through the economizer first because it provides the most efficiency from the waste stack gases

89
Q

What is the maximum suction lift you would recommend for centrifugal pump under normal conditions

A

15 ft for centrifugal pump 20 ft for reciprocating

90
Q

The three main objectives of air conditioning are

A

Provides proper temperature for comfort provides proper humidity for comfort provides the air and provides proper airflow

91
Q

Name two specific types of circuit breakers

A

Thermal and thermal magnetic

Chief 1 (7 decks)

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