compression systems operation

1.

1 point

The emergency discharge should be operated

on the order of an authorized person.

when there is a fire.

when purging the system.

on the order of the plant manager.

when there is a chance of an explosion.

2.

1 point

To prevent liquid refrigerant from being carried to the compressor,

an indirect system would be used.

the evaporator outlet gas is superheated.

an absorption system is used.

safety heads are used.

the system is kept flooded.

3.

1 point

In what state is the refrigerant entering the condenser?

Superheated vapor

Boiling liquid

Sub-cooled liquid

Saturated vapor

4.

1 point

The discharge of a pressure relief valve must be _____________ meters above the ground.

12

4.6

7.2

7.6

2.3

5.

1 point

A lack of refrigerant charge in the system, is indicated by a

high discharge temperatures.

closed expansion valve.

high discharge pressure.

low discharge pressure.

6.

1 point

What is the minimum required relief capacity, in kg/min, of a relief valve on an ammonia receiver 1m in diameter and 2m long?

2

8.4

5.6

2.4

4.8

7.

1 point

Overpressure protection is not required on vessels with an internal diameter less than

152 mm

255 mm

240 mm

280 mm

168 mm

8.

1 point

Refrigerant piping that crosses passageways shall be not less than ________ above the floor.

2.7 m

2 m

2.9 m

3.7 m

2.3 m

9.

1 point

A new refrigeration system is placed under a vacuum to

remove any moisture.

add the refrigerant as a gas.

draw the refrigerant charge in

test the compressor parts for tightness.

test for leaks.

10.

1 point

Vessels with an internal gross volume of 0.28 m3 or more shall have:

A fusible plug.

Two pressure relief devices in parallel.

A pressure relief valve

A fusible plug or pressure relief valve.

A rupture diaphragm.

11.

1 point

Receivers used to carry the full charge should have a sufficient capacity without the liquid occupying more than:

50%

75%

80%

60%

90%

12.

1 point

The minimum low side design pressure of an ammonia system is

103 kpa.

210 kpa

951 kpa

6583 kpa

138 kpa

13.

1 point

Liquid level gage glasses on refrigeration receivers must be fitted with

test plugs.

automatic shut off valves.

a plastic gage.

packless valves.

rising stem valves.

14.

1 point

When charging a refrigeration system

the compressor valves are throttled.

you add to the condenser.

the King Valve is shut.

the compressor is stopped.

you add to the receiver

15.

1 point

How much ammonia does a standard cylinder hold?

25 kg

45 kg

75 kg

110 kg

16.

1 point

During normal operation, how often should the suction line strainer be cleaned?

Monthly

Daily

Semi-annually

Weekly

17.

1 point

Piping for ammonia systems is normally

cast iron.

stainless steel.

copper tubing.

plastic

carbon steel.

18.

1 point

The maximum amount of refrigerant, besides the charge that may be stored in the machinery room, is

136 kg

50 kg

200 kg

100 kg

78 kg

19.

1 point

What is placed alongside the emergency valve?

An axe

Breathing apparatus

An emergency stop switch

An alarm

Firehose