MCQ GAS REFRIGERATION

 

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https://www.mesubjects.net/wp-admin/post.php?post=4198&action=edit  MCQ Vapor Comp Ref

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MCQ GAS REFRIGERATION

MCQ on gas refrigeration increases understanding

and clarity. Its COP is much less than one. It is

still used in all the aircrafts because of being safe

& eco-friendly nature.

.

  1. A gas refrigeration works on

  1. Carnot Cycle

  2. Rankine Cycle

  3. Brayton Cycle

  4. None

ANS: (d)

  1. A gas refrigeration works on

  1. Reversed Carnot Cycle

  2. Rankine Cycle

  3. Reversed Brayton Cycle

  4. None

ANS: (c)

  1. In gas refrigeration, cooling effect is by

  1. Sensible heat effect

  2. Latent heat effect

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. In gas refrigeration, evaporator is replaced by a

  1. Boiler

  2. Refrigerator

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. In gas refrigeration, condenser is replaced by a

  1. Refrigerator

  2. Boiler

  3. Cooler

  4. None

ANS: (c )

  1. COP of gas refrigeration is

  1. >1

  2. <1

  3. = 1

  4. None

ANS: (b)

  1. In gas refrigeration, expansion valve is replaced by

  1. Refrigerator

  2. Compressor

  3. Turbine

  4. None

ANS: (c )

  1. In gas refrigeration, COP is

  1. Cooling effect/Work input in compressor

  2. Work input in compressor/Cooling effect

  3. Cooling effect/Net work done

  4. None

ANS: (c )

  1. Gas refrigeration is used in

  1. Refrigerated trucks

  2. Refrigerators

  3. Aircrafts

  4. None

ANS: (c )

  1. Why is gas refrigeration used in aircrafts?

  1. Less weight of refrigeration equipment

  2. More weight of refrigeration equipment

  3. Same weight as in vapor compression refrigeration

  4. None

ANS: (a)

  1. In gas refrigeration, temperature drop across expander is

  1. Very high

  2. Very low

  3. No drop

  4. None

ANS: (a)

  1. Gas refrigeration is more harmful than vapor compression refrigeration

  1. Yes

  2. NO

  3. Can’t say

  4. None

ANS: (b)

  1. In gas refrigeration, which one is not present

  1. Compressor

  2. Turbine

  3. Generator

  4. None

ANS: (c )

  1. In gas refrigeration, condenser is cooled by

  1. Water

  2. Brine

  3. Air

  4. None

ANS: (c )

  1. Which compressor is used in gas refrigeration?

  1. Reciprocating

  2. Rotary

  3. Centrifugal

  4. None

ANS: (c )

  1. The theoretical expansion process used in gas refrigeration is

  1. Isentropic

  2. Isothermal

  3. Isobaric

  4. None

ANS: (a)

  1. The theoretical compression process used in gas refrigeration is

  1. Isentropic

  2. Isothermal

  3. Isobaric

  4. None

ANS: (a)

  1. The size of cooler in gas refrigeration as compared to vapor compression refrigeration is

  1. Smaller

  2. Equal

  3. Larger

  4. None

ANS: (c )

  1. The temperature after expansion in gas refrigeration is

  1. Above 00C

  2. Below 00C

  3. Can’t say

  4. None

ANS: (b)

  1. Secondary refrigerant used in gas refrigeration

  1. Ammonia

  2. Freon

  3. Water

  4. None

ANS: (d)

  1. In gas refrigeration, brine solution is used as secondary refrigerant

  • Yes

  • No

  • Can’t say

  • None

ANS: (b)

  1. Cooling effect in gas refrigeration is

  1. m. (h1-h4)

  2. m.cp Δt

  3. m. Latent heat

  4. None

ANS: (b)

  1. The work done in the compressor of gas refrigeration is

  1. m. (h2-h1)

  2. m.cp (t2-t1)

  3. m. Latent heat

  4. None

ANS: (b)

  1. The work done in the expander of gas refrigeration is

  1. m. (h3-h4)

  2. m.cp (t3-t4)

  3. m. cv (t3-t4)

  4. None

ANS: (b)

  1. The heat lost in the cooler of gas refrigeration is

  1. m. (h2-h3)

  2. m.cp (t2-t3)

  3. m. cv (t2-t3)

  4. None

ANS: (b)