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DC 3dr > Chapter- 120-139 > Flashcards

Chapter- 120-139 Flashcards

1
Q

Discrete control when used for steam pressure is what type of control

A

On/off

Stop/go

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2
Q

The purpose of the condenser in a refrigerant system is to

Cool the refrigerant gas

Change the refrigerant vapor a liquid state

Change the refrigerant liquid into vapor

Filter out the moisture

A

Change the refrigerant vapor a liquid state

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3
Q

The ______ is where the liquid refrigerant turns to gas and absorbs latent heat

Condenser

Compressor

Filter drier

Evaporator

A

Evaporator

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4
Q

The _________ removes moisture from a refrigeration system

Condenser

Compressor

Filter drier

Evaporator

A

Filter drier

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5
Q

The oil in refrigeration system is used for

Lubrication

Cooling and lubrication

Cooling

Cooling lubrication and filtration

A

Cooling and lubrication

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6
Q

When is pump steam bound

A

When water is too hot for suction

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7
Q

Which by product has the lowest heating value

Coke oven

Coal gas

Blast furnace gas

Sewer gas

A

Blast furnace gas

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8
Q

What is the last protection against overheating in a boiler

LWCO

safety valve

High temperature cut out switch

Flame safeguard

A

LWCO

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9
Q

In an open type expansion tank how high should the tank be mounted

At least 6 feet above the highest heating element

At least 4 feet above the highest heating element

A

At least 4 feet above the highest heating element

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10
Q

Which element does not take an actual action in the combustion process

Carbon

Nitrogen

Hydrogen

Oxygen

A

Nitrogen

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11
Q

What would you add to the boiler if you are needed to protect the refractory from excess heat and increase the capacity of the boiler

Down comer tubes

Steam tubes

Riser tubes

Water wall tubes

A

Riser tubes

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12
Q

What kind of valve allows a boiler to be cut in online when the main isolate valve is open or close

Automatic check valve

Pilot gate valve

Stop check valve

Glove valve

A

Stop check valve

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13
Q

In a siphon what is the water seal between the boiler and the pressure control called

Water glaze

Apparatus water

Condensate

A

Condensate

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14
Q

How to calculate a boiler horse power with factor of evaporation

A

Lb/hr times factor of evaporation divided by 34.5

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15
Q

What is the circumference of a circle with a 10” diameter

Formula

A

3.14 times diameter

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16
Q

What is the area of a circle with 10” diameter

Formula

A

Area times area times 0.7854

17
Q

What is the area of a triangle with a base of 20” and a heigh of 18”

Formula

A

1/2 times base times high

18
Q

What is the force acting on a 2” pressure relief valve with a popping pressure of 125 psi

Formula

A

Tp times area times area times 0.7854

19
Q

At what pressure will a 3” pressure relief valve lift with a 1500 pounds spring

Formula

A

1500 divided (3x3x0.7854)

DC 3dr (13 decks)

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