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Chief 1 > Exam 1 chief > Flashcards

Exam 1 chief Flashcards

1
Q

Normal furnace draft found in oil fired boilers is

A

.05 to 0.1 inches of water

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2
Q

Ammonia refrigerant leaks are best detected by use of a

A

Sulfur candle

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3
Q

Which one of the following types of oil burners requires lower oil admission temperatures

A

Steam atomizing burner

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4
Q

The maximum time allowed for trail for ignition on the main flame of an oil burner is shall not exceed 15 or 90 seconds depending on the btu

A

10 seconds

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5
Q

The proper amount of CO2 when using natural gas is

A

8%

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6
Q

The proper amount of CO2 when using number six oil is

A

14%

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7
Q

What attempting to determine the proper size of a boiler feed pump it is advisable to obtain one capable of delivering

A

One cubic foot of water for every boiler horsepower an hour

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8
Q

Azeolite watch her softener exchanges calcium and magnesium ions for

A

Sodium ions

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9
Q

The absorbing reagent which is used to absorb CO2

A

Potassium hydroxide

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10
Q

The absorbing reagent which is used to absorb O2

A

Potassium pyrrogalate

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11
Q

The absorbing free agent which is used to absorb Co is

A

Cuprous chloride

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12
Q

Lantern rings are used on centrifugal pumps too

A

Prevent air leakage into the casing

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13
Q

The main reason for not using water to extinguish fires on or near a power plant electrical equipment is

A

It may conduct electricity and cause shock

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14
Q

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

A

Saybolt universal viscosity meter

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15
Q

A scale pocket is most often found on

A

The bottom of a riser

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16
Q

When a hydrometer made of wood or hair is made to operate a relay to automatically control humidity it is called

A

Hygrostate

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17
Q

If you were about to start a large motor-driven ammonia compressor you would

A

Close the suction valve and open the discharge full

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18
Q

Went to identical centrifugal pumps are operated in series

A

The head at which they operate together at a given capacity is double that for a single pump

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19
Q

Attend one set down transformer has 44,000 volts on the primary and 4,400 volts on the secondary if the taps are changed to reduce the number of turns in the primary by 2.5% then the secondary voltage will be most nearly

A

4,510 volts

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20
Q

Wearing rings are installed on centrifugal pumps to prevent wear and tear to

A

impeller

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21
Q

The fuel oil pressure in a mechanical atomizer burner varies from

A

100 to 200 PSI

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22
Q

On ammeter is connected to the secondary of a current transformer with the ratio of 100 to 5 if the ammeter indicates 2.0 amps the current in the primary circuit will be most nearly

A

40 amps

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23
Q

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

A

False

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24
Q

When sampling stack gases care should be taken to obtain a representative sample of the gases

A

True

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25
Q

For the drive removal of Ash created by a pulverizing coal system it is best to use a low fusing ash coal

A

False

26
Q

Soup blowers should be operated when the boiler is operating at 75% capacity or higher

A

False

27
Q

The fourth pass out of boiler can add up to 8 percent efficiency

A

True

28
Q

For every 20 degrees Fahrenheit rise in feed water temperature due to heating the feed water there is a 1% saving in fuel

A

False

29
Q

A fuel oil pump should exceed the oil burners maximum intake requirement

A

True

30
Q

When the critical velocity of liquid is reached the liquids flow lines start to break up

A

True

31
Q

The size of the fuel valve determines the time needed for fuel ignition

A

False

32
Q

Humidity is removed from the air by heating the air

A

False

33
Q

Make up water when needed should be added slowly and at a time when the boiler is steaming moderately

A

True

34
Q

The total head of a pump is calculated by adding the suction lift and the suction head

A

False

35
Q

on automatic combustion control maintains steam pressure by supplying fuel and air simultaneously to the boiler according to the steam demand

A

True

36
Q

A whistling noise in the expansion valve on on ammonia system indicates on insufficient amount of refrigerant in the system

A

True

37
Q

The problem of scale is greater in a high pressure boiler than in a low pressure boiler

A

True

38
Q

What factor determines whether a boiler is constructed high pressure or low pressure

A

The safety valve setting and the asme code stamp on the boiler

39
Q

Every boiler should be internally inspected how often

A

High pressure once a year low pressure once every three years

40
Q

Every boiler should be externally inspected how often

A

Twice per year once at internal inspection and one six months later

41
Q

What factor of safety is used for boiler 23 years old

A

Five up to 25 years of age

42
Q

When is a boiler exempt from a fusible plug

A

When it is on automatically fired boiler oil or gas

43
Q

Name three types of flame detection systems used on oil-fired equipment and explain each

A

Number one photocell flame detection it both sense the visible light of the flame number two infrared flame detection it will sense the infrared waves of the flame number three ultraviolet light flame detection it will sense the ultraviolet waves of the flame

44
Q

you know Brian refrigeration system the Brian solution is nothing more than water to which sodium chloride or calcium chloride has been added what is the chief advantage of this brine solution over plain water

A

It will not freeze when the temperature is lowered below 32° f

45
Q

if a boiler in your care was being converted from high pressure to low pressure what would you do following to properly adapt them to the new pressure explain in detail

A

Steam traps the steam trap orifices would have to be changed to orifices with a larger opening for lower pressure safety valves the safety valves would have to be changed to a low pressure safety valve and it would be physically larger to relieve the volume of steam steam piping the steam piping would have to be changed to a larger pipe size because low pressure steam is at a larger volume per pound of steam flow

46
Q

What are two results of an increase in temperature to air being compressed by an air compressor

A

One it will decrease the capacity of the compressor 2. it will increase the horsepower of the motor

47
Q

Name two types of superheaters and tell where each would be located

A

One radiant type super heater-it would be located in the combustion chamber to receive its heat by the furnace radiation 2. Convection type super heater it would be located between the two Banks and would receive its heat by the hot combustion gases that pass over it

48
Q

What would the advantage of installing fins on superheat her tubes

A

It would increase the efficiency of the superheater

49
Q

How does a d super heater work

A

A temperating bypassing Superior heater piping through a steam drum below the water level which will remove heat and decrease the super heat temperature 2. Injection by injecting pure water through a spray nozzle inside the superheater piping the water will absorb heat and produce more superheated steam at a lower temperature

50
Q

How is he removed from the oil large transformers

A

The oil transfers the heat to the Shell of the transformer which has fins on the outside and are cooled by air

51
Q

With what occurs when air or moist air comes in contact with this oil

A

A sludge is formed which retards heat transfer

52
Q

What is used on large transformers instead of error in the space above the oil which is located inside the case

A

Nitrogen gas

53
Q

List three causes of tube failure in boiler operations

A

Scale caustic and brittleman excess expanding oxygen pitting

54
Q

Name two devices used to control or eliminate water hammer

A

Steam traps properly pitch steam and return lines

55
Q

Why is the suction in inlet pipe normally fitted into the center of the casing of a centrifugal pump

A

Because the centrifugal force creates a vacuum at the center of the rotation of the impeller

56
Q

Name two causes of shock to a hot water heating system

A

Trapped air in the system 2adding cold water to the boiler

57
Q

Name two disadvantages of using steam atomization in conjunction with oil burners

A

It takes a great quantity of your steam to atomize the oil 2.you need steam from another boiler to start a cold boiler or you must use air to atomize the oil if the source of steam is not available

58
Q

What is caustic embrittlement and what causes it

A

Water with inverling characteristics high alkalinity 2stress and leak to concentrate the alkalinity which causes tiny cracks in boiler metal which weekends the metal it occurs at seams and two bands where the metal has been stressed by work

59
Q

Name two ways in which boiler tubes may be replaced

A

Expanded and beated to the tube sheet 2. Welded

60
Q

Many types of steam separators use of rotary or spinning action to separate water particles from the steam upon what principle do they work and what takes place during this action

A

Centrifugal force which separates the water particles from the steam

61
Q

Under what conditions would would it be legal for the chief engineer to leave his boiler room and go to another part of the building

A

If a second class engineer is on the same watch

Chief 1 (7 decks)

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