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RAC Section No. 1

Total questions: 45

Worksheet time: 25mins

Name
Class
Date
1.

A reversible Carnot cycle used for refrigeration

comprises

a)

Two isentropic and two adiabatic processes

b)

Two isentropic and two constant volume processes

c)

Two isentropic and two constant pressure process

d)

Two isentropic and two isothermal processes

2.

Where does the low pressure liquid become a gas (vapour)?

a)

Evaporator

b)

Condenser

c)

TX valve

d)

Compressor

3.
The two major functions of the compressor are to circulate refrigerant and to compress ____________. 
a)
Low-pressure refrigerant vapor into hot, high temperature vapor
b)
High-pressure refrigerant vapor into high-temperature, low temperature liquid
c)
Low-pressure refrigerant liquid into hot, high temperature vapor
d)
Low-pressure refrigerant liquid into hot, high temperature liquid
4.

As refrigerant moves through the condenser it goes from _____ to ________

a)

a Vapor to a Liquid

b)

a Liquid to a Vapor

c)

Low pressure Vapor to a low pressure vapor

d)

High pressure liquid to a low pressure liquid

5.

The heat removing capacity of one tone of refrigeration is equal to?

a)

210 Watt

b)

210 kJ/hour

c)

3.5 kJ/hour

d)

3.5 W

6.

In which type of air refrigeration system a secondary compressor is used?

a)

Reduced ambient type air refrigeration System

b)

Regenerative type air refrigeration System

c)

Simple air refrigeration System

d)

Boot strap air refrigeration System

7.

The COP of a refrigerator is 4. What will be the COP of a heat pump if it is working between same source and sink temperature ?

a)

2

b)

3

c)

4

d)

5

8.

One tonne of refrigerating machine means that,

a)

One tonne is the total mass of the machine

b)

One tonne of refrigerant is used

c)

One tonne of water can be converted into ice.

d)

One tonne of ice when melts from and at 0oC in 24 hours, the refrigerating effect produced is equivalent to 210 KJ/min

9.

In air conditioning of aeroplanes, using air as refrigerant, the cycle used is

a)

Reversed Carnot cycle

b)

Reversed Joule cycle

c)

Reversed Brayton cycle

d)

Reversed Otto cycle

10.

The condition of refrigerant after passing through the condenser in a vapour compression system is

a)

(A) Saturated liquid

b)

(B) Wet vapour

c)

(C) Dry saturated vapour

d)

(D) Superheated vapour

11.

The C.O.P. of a heat pump working on a reversed Carnot cycle is ( T₂- high temperature, T₁ - Low Temperature)

a)

(A) T₁/(T₂ - T₁)

b)

(B) (T₂ - T₁)/T₁

c)

(C) (T₁ - T₂)/T₁

d)

(D) T₂/(T₂ - T₁)

12.

The highest temperature during the cycle,in a vapour compression system,occures after .......

a)

A.Compression

b)

B.Condensation

c)

C.Expansion

d)

C.Evaporation

13.

A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

a)

(A) 1.33

b)

(B) 2.33

c)

(C) 3.33

d)

(D) 4.33

14.

In which direction does refrigerant flow during a normal cooling cycle?

a. compressor to condenser

b. compressor to evaporator

c. compressor to filter drier

d. compressor to exit of evaporator

a)

compressor to evaporator

b)

compressor to filter drier

c)

compressor to exit of evaporator

d)

compressor to condenser

15.

Below are the process in refrigeration system EXCEPT

a)

Compression

b)

Condensation

c)

Power

d)

Evaporation

16.

A boot-strap air cooling system has

a)

One heat exchanger

b)

Two heat exchanger

c)

Three heat exchanger

d)

Four heat exchanger

17.

ODP stands for

a)

Outdoor Dangerous Pollution

b)

Over Demanding Protocol

c)

Ozone Depletion Protocol

d)

Ozone Depletion Potential

18.

The chemical formula of refrigerant R11 is:

a)

CCl3F

b)

CClF3

c)

CClHF

d)

CHF

19.

Secondary refrigerants are also called as

a)

Coolers

b)

Brines

c)

Wines

d)

Synthetic Solutions

20.

Inorganic compounds are

a)

500 series

b)

200 series

c)

700 series

d)

1000 series

21.

The reference gas used in calculation of ODP is:

a)

CO2

b)

CFC

c)

NO2

d)

Hydrocarbons

22.

R717 is refrigerant name for

a)

Water

b)

Carbon dioxide

c)

Ammonia

d)

Air

23.

For the refrigernat R134a, 'a' stands for:

a)

isomers

b)

Epimers

c)

isotopes

d)

Derivation

24.

Multicompression vapour refrigeration systems are used when

a)

Required temperature lift increases

b)

Required temperature lift decreases

c)

Refrigeration is required at different temperatures

d)

Required refrigeration capacity is large

25.

Using intercooling in multi-stage compression systems

a)

Refrigeration effect can be increased

b)

Work of compression in higher stage compressor can be reduced

c)

Maximum cycle temperature can be increased

d)

All of the above

26.

In multi-stage systems

a)

The refrigerant used should have high critical temperature and low freezing point

b)

There is a possibility of migration of lubricating oil from one compressor to other

c)

Operating pressures can be too high or too low

d)

All of the above

27.

Refrigeration system with liquid subcooler is used to

a)

Prevent the entry of liquid into compressor

b)

Prevent flashing of refrigerant liquid ahead of low stage expansion device

c)

Reduce work of compression

d)

None of the above

28.

Which of the following refrigerants replace R12 in domestic refrigerators?

a)

R22

b)

R11

c)

R134a

d)

R141b

29.

For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

a)

copper

b)

aluminum

c)

steel

d)

brass

30.

The freon group of refrigerants are

a)

halo-carbon refrigerants

b)

azeotrope refrigerants

c)

inorganic refrigerants

d)

hydro-carbon refrigerants

31.

In absorption refrigeration systems, the compressor of vapour compression systems is replaced by

a)

Absorber

b)

Generator

c)

Pump

d)

All of the above

32.

Which is the three fluid vapour absorption system ?

a)

Aqua-Ammonia

b)

LiBr-Aqua

c)

Electrolux

d)

Kelvinator

33.

In the Aqua-Ammonia vapour absorption system, which is used as absorbent

a)

Aqua

b)

Ammonia

c)

Air

d)

None of above

34.

In a three fluid vapour absorption refrigeration system, the hydrogen gas is used to

a)

Improve system performance

b)

Reduce the partial pressure of refrigerant in evaporator

c)

Circulate the refrigerant

d)

Provide a vapour seal

35.

Compared to compression systems, absorption systems offer the benefits of

a)

Higher COPs

b)

Lower refrigeration temperatures

c)

Possibility of using low-grade energy sources

d)

All of the above

36.

The ODP Value for R134a is

a)

0

b)

1

c)

2

d)

3

37.

Compared to compression systems, absorption systems

a)

Contain very few moving parts

b)

Offer less noise and vibration

c)

Are compact for large capacities

d)

All of above

38.

Identyfy odd word

a)

R500

b)

R717

c)

R118

d)

R744

39.

The refrigerant, commonly used in vapour absorption system is

a)

Ammonia

b)

Water

c)

Halocarbon

d)

Hydrocarbon

e)

Ammonia & Water

40.

When different temperatures are to be maintained at different points then_______evaporator system may be used

a)

Single

b)

Multiple

c)

Both

d)

None

41.

Which of the following refrigerants is a blend?

a)

R-134a

b)

R-22

c)

R-410a

d)

none of the above

42.

Multicompression vapour refrigeration systems are used when

a)

Required temperature lift increases

b)

Required temperature lift decreases

c)

Refrigeration is required at different temperatures

d)

Required refrigeration capacity is large

43.

In multi-stage systems

a)

The refrigerant used should have high critical temperature and low freezing point

b)

There is a possibility of migration of lubricating oil from one compressor to other

c)

Operating pressures can be too high or too low

d)

All of the above

44.

ODP value of R11 is

a)

0

b)

1

c)

2

d)

3

45.

In the Aqua-Ammonia vapour absorption system, which is used as absorbent

a)

Aqua

b)

Ammonia

c)

Air

d)

None of above

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