Test: RAC Level - 2

Question 1

Clapeyron equation is a relation between

Accepted Answer

temperature, pressure, specific volume and enthalpy

Answer

temperature, pressure and enthalpy

Answer

specific volume and enthalpy

Answer

temperature and enthalpy

Answer

temperature, pressure, and specific volume

Question 2

One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

Accepted Answer

in 24 hours

Answer

in 1 hour

Answer

in 1 minute

Answer

in 12 hours

Answer

in 10 hours

Question 3

One ton refrigeration corresponds to

Accepted Answer

50 kcal/min

Answer

50 kcal/kr

Answer

80 kcal/day

Answer

80 kcal/hr

Answer

1000 kcal/day

Question 4

In S.I. unit, one ton of refrigeration is equal to

Accepted Answer

210 kJ/min

Answer

21 kJ/min

Answer

420 kJ/min

Answer

840 kJ/min

Answer

105 kJ/min

Question 5

The moisture in a refrigerant is removed by

Accepted Answer

driers

Answer

evaporator

Answer

safety relief valve

Answer

dehumidifier

Answer

expansion valve

Question 6

Critical pressure of a liquid is the pressure

Accepted Answer

above which liquid will remain liquid

Answer

above which liquid becomes gas

Answer

above which liquid becomes vapour

Answer

above which liquid becomes solid

Answer

at which all the tree phases exist together

Question 7

The refrigerant for a refrigerator should have

Accepted Answer

high latent heat

Answer

high sensible heat

Answer

high total heat

Answer

low latent heat

Answer

low sensible heat

Question 8

Rating of a domestic refrigerator is of the order of

Accepted Answer

0.1 ton

Answer

5 tons

Answer

10 tons

Answer

40 tons

Answer

100 tons

Question 9

The domestic refrigerator uses following type of compressor

Accepted Answer

piston type reciprocating

Answer

centrifugal

Answer

axial

Answer

miniature sealed unit

Answer

none of the above

Question 10

Refrigeration in aeroplanes usually employs the following refrigerant

Accepted Answer

Air

Answer

CO2

Answer

Freon-11

Answer

Freon-22

Answer

none of the above

Question 11

The higher temperature in vapour compression cycle occurs at

Accepted Answer

compressor discharge

Answer

receiver

Answer

expansion valve

Answer

evaporator

Answer

condenser discharge

Question 12

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

Accepted Answer

increases

Answer

decreases

Answer

remains same

Answer

depends on other factors

Answer

none of the above

Question 13

Aqua ammonia is used as refrigerant in the following type of refrigeration system

Accepted Answer

absorption

Answer

compression

Answer

direct

Answer

indirect

Answer

none of the above

Question 14

Where does the lowest temperature occur in a vapour compression cycle ?

Accepted Answer

evaporator

Answer

condenser

Answer

compressor

Answer

expansion valve

Answer

receiver

Question 15

Freon group of refrigerants are

Accepted Answer

non-toxic and non-inflammable

Answer

inflammable

Answer

toxic

Answer

non-inflammable and toxic

Answer

non-toxic and inflammable

Question 16

Ammonia is

Accepted Answer

highly toxic and inflammable

Answer

non-toxic

Answer

non-inflammable

Answer

toxic and non-inflammable

Answer

none of the above

Question 17

Superheating in a refrigeration cycle

Accepted Answer

decreases COP

Answer

increases COP

Answer

other factors decide COP

Answer

unpredictable

Question 18

Moisture in freon refrigeration system causes

Accepted Answer

freezing automatic regulating valve

Answer

ineffective refrigeration

Answer

high power consumption

Answer

corrosion of whole system

Answer

breakdown of refrigerant

Question 19

The COP of a vapour compression plant in comparison to vapour absorption plant is

Accepted Answer

more

Answer

less

Answer

same

Answer

more/less depending on size of plant

Question 20

The COP of a domestic refrigerator in comparison to domestic air conditioner will be

Accepted Answer

less

Answer

same

Answer

more

Answer

dependent on weather conditions

Answer

unpredictable

Question 21

The evolution of heat of solution takes place in ammonia absorption plant when

Accepted Answer

ammonia vapour goes into solution

Answer

ammonia vapour is driven out of solution

Answer

lithium bromide mixes with strong solution

Answer

weak solution mixes with strong solution

Answer

lithium bromide is driven out of solution

Question 22

Presence of moisture in a refrigerant affects the working of

Accepted Answer

expansion valve

Answer

heat transfer

Answer

condenser

Answer

evaparator

Answer

none of the above

Question 23

The electrolux refrigerator works on

Accepted Answer

absorption refrigeration system

Answer

electro magnetic principle

Answer

thermo-electric principle

Answer

vapour compression system

Answer

vortex tube system

Question 24

Lithium bromide in vapour absorption refrigeration system is used as

Accepted Answer

absorbent

Answer

refrigerant

Answer

cooling substance

Answer

auxiliary refrigerant

Answer

lubricant

Question 25

In electrolux refrigerator

Accepted Answer

ammonia evaporates in hydrogen

Answer

ammonia is absorbed in hydrogen

Answer

ammonia is absorbed in water

Answer

hydrogen evaporates in ammonia

Answer

hydrogen is absorbed in water

RAC Level - 2 - Free MCQ Practice Test with solutions, GATE ME Mechanical

MCQ Practice Test & Solutions: Test: RAC Level - 2 (25 Questions)

Clapeyron equation is a relation between

One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

One ton refrigeration corresponds to

In S.I. unit, one ton of refrigeration is equal to

The moisture in a refrigerant is removed by

Critical pressure of a liquid is the pressure

The refrigerant for a refrigerator should have

Rating of a domestic refrigerator is of the order of

The domestic refrigerator uses following type of compressor

Refrigeration in aeroplanes usually employs the following refrigerant

The higher temperature in vapour compression cycle occurs at

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

Aqua ammonia is used as refrigerant in the following type of refrigeration system

Where does the lowest temperature occur in a vapour compression cycle ?

Freon group of refrigerants are

Ammonia is

Superheating in a refrigeration cycle

Moisture in freon refrigeration system causes

The COP of a vapour compression plant in comparison to vapour absorption plant is

The COP of a domestic refrigerator in comparison to domestic air conditioner will be

The evolution of heat of solution takes place in ammonia absorption plant when

Presence of moisture in a refrigerant affects the working of

The electrolux refrigerator works on

Lithium bromide in vapour absorption refrigeration system is used as

In electrolux refrigerator

Mechanical Engineering SSC JE (Technical)

Mechanical Engineering SSC JE (Technical)

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