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Test: RAC Level - 1 - Mechanical Engineering MCQ

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25 Questions MCQ Test - Test: RAC Level - 1

Test: RAC Level - 1 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: RAC Level - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: RAC Level - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: RAC Level - 1 below.

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Test: RAC Level - 1 - Question 1

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The Coefficient of Performance of a domestic refrigerator is

A.
less than 1
B.
more than 1
C.
equal to 1
D.
dependent upon the mass of the refrigerant

Test: RAC Level - 1 - Question 2

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Which one of the following is correct relation between (COP)_HP and (COP)_R

A.
(COP)_HP – (COP)_R= 1
B.
(COP)_R – (COP)_HP = 1
C.
(COP)_HP + (COP)_R = 1
D.
(COP)_HP + (COP)_R = 0

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Test: RAC Level - 1 - Question 3

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One tonnes of refrigeration is equal to

A.
210 kJ/min
B.
3.5 kJ/min
C.
105 kJ/min
D.
250 kJ/min

Test: RAC Level - 1 - Question 4

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Thermoelectric refrigeration system is based on

A.
Peltier effect
B.
Seeback effect
C.
Joule effect
D.
None of these

Test: RAC Level - 1 - Question 5

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A heat pump operating based on a reversed carnot cycle between temperature T₁ and T₂, where T₁ is higher absolute temperature and T₂ is lower absolute temperature then the COP of heat pump is

Test: RAC Level - 1 - Question 6

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A refrigerator operating based on reversed carnot cycle between T₁and T₂ where T₁ is high temperature and T₂ is lower temperature then COP of refrigerator is

Test: RAC Level - 1 - Question 7

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Horse power and kW required per tonne of refrigeration is expressed as

A.
B.
C.
4.75 × COP and 3.5 COP
D.

Detailed Solution for Test: RAC Level - 1 - Question 7

Horse power per ton = 4.75?COP

1 kW/ton = 3.516/COP

Test: RAC Level - 1 - Question 8

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The COP of a heat pump can be increased either by decreasing T_H by ΔT or by increasing T_L by ΔT. The new COP of the heat pump is

A.
same in both the cases
B.
highest if T_H is decreased
C.
highest it T_Lin in increased
D.
independent of change in T_H and T_L

Test: RAC Level - 1 - Question 9

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The COP of a Carnot refrigeration cycle decreases on

A.
decreasing the difference in operating temperatures
B.
keeping the upper temperature constant and increasing the lower temperature
C.
increasing the upper temperature and keeping the lower temperature constant
D.
increasing the upper temperature and decreasing the lower temperature

Test: RAC Level - 1 - Question 10

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The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.

A.
same
B.
less
C.
more
D.
none

Test: RAC Level - 1 - Question 11

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Which one of the following sequence is correct in vapour compression cycle

A.
iso-enthalpic expansion, iso-baricheat rejection, isentropic compression, iso-baric heat absorption
B.
iso-entropic compression, iso-baric heat rejection, iso-enthalpic expansion, iso-baric heat absorption
C.
iso-baric heat absorption, isentropic compress, iso-baric heat rejection, iso enthalpic expansion
D.
iso-enthalpic expansion, iso-baric heat absorption isentropic compression, isobaric heat rejection

Test: RAC Level - 1 - Question 12

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In a vapour-compression refrigeration cycle, if h₁ and h₂ denote the enthalpies at inlet and exit of the compressor respectively, h₃ is the enthalpy at the exit of the condenser and h₄ is the enthalpy at the inlet of the evaporator, the COP for the cycle is

Test: RAC Level - 1 - Question 13

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In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

A.
expansion valve to the evaporator
B.
evaporator to the thermostat
C.
condenser to the expansion valve
D.
condenser to the evaporator

Detailed Solution for Test: RAC Level - 1 - Question 13

In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the Expansion valve to the evaporator

Test: RAC Level - 1 - Question 14

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Formation of frost on evaporator of refrigerator

A.
increases the heat transfer rate due to superior heat transfer
B.
loss of heat transfer rate due to poor heat transfer
C.
can be avoided by proper design
D.
increases the COP

Test: RAC Level - 1 - Question 15

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In a vapour compression cycle, the refrigerant immediately after expansion valve is

A.
Saturated liquid
B.
Sub-cooled liquid
C.
Wet vapour
D.
Dry vapour

Test: RAC Level - 1 - Question 16

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Sub-cooling in a refrigeration cycle have effect of

A.
increase in COP
B.
decrease in COP
C.
no effect in COP
D.
none of these

Test: RAC Level - 1 - Question 17

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Superheating in refrigeration cycle

A.
increases COP
B.
decreases COP
C.
doesn’t alter COP
D.
none of these

Detailed Solution for Test: RAC Level - 1 - Question 17

Correct Answer :- b

Explanation : Useful superheating increases both the refrigeration effect as well as the work of compression. Hence the COP (ratio of refrigeration effect and work of compression) may or may not increase with superheat, depending mainly upon the nature of the working fluid. Even though useful superheating may or may not increase the COP of the system, a minimum amount of superheat is desirable as it prevents the entry of liquid droplets into the compressor

Test: RAC Level - 1 - Question 18

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Solid CO₂ is produced by

A.
vapour absorption method
B.
simple vapour compression cycle
C.
vapour compression cycle with compounding of compressor
D.
pressure snow chamber method

Test: RAC Level - 1 - Question 19

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The thermodynamic cycle used in aircraft refrigeration is

A.
reversed Carnot
B.
reversed Brayton
C.
vapour Compression cycle
D.
reversed Stirling

Test: RAC Level - 1 - Question 20

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In aircraft, air refrigeration cycle is used because of

A.
low weight per tonne of refrigeration
B.
high heat transfer rate
C.
lower temperature at high altitudes
D.
higher coefficient of performance

Test: RAC Level - 1 - Question 21

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Bell Coleman cycle consists of

A.
two isobars and two isentropes
B.
two isochores and two isentropes
C.
two isotherms and two isochores
D.
two isotherms and two isentropes

Test: RAC Level - 1 - Question 22

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In electrolux refrigerator.

A.
ammonia is absorbed in hydrogen
B.
ammonia is absorbed in water
C.
ammonia evaporates in hydrogen
D.
hydrogen evaporates in ammonia

Detailed Solution for Test: RAC Level - 1 - Question 22

Correct Answer :- c

Explanation : In Electrolux refrigerator Ammonia evaporates in hydrogen.

The ammonia liquid leaving the condenser enters the evaporator and evaporates into the hydrogen at the low temperature corresponding to its low partial pressure. The mixture of ammonia and hydrogen passes to the absorber into which is also admitted water from the separator. The water absorbs the ammonia and the hydrogen returns to the evaporator. In the absorber the ammonia therefore passes from the ammonia circuit into water circuit as ammonia in water solution. This strong solution passes to the generator where it is heated and the vapor given off rises to the separator. The water with the vapor is separated out and a weak solution of ammonia is passed back to the absorber, thus completing the water circuit. The ammonia vapor rises from the separator to the condenser where it is condensed and then returned to the evaporator.

Test: RAC Level - 1 - Question 23

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Which of the following cycles uses air as the refrigerant

A.
Ericsson
B.
Sterling
C.
Carnot
D.
Bell-coleman

Test: RAC Level - 1 - Question 24

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An important characteristic of absorption system of refrigeration is

A.
noisy operation
B.
quiet operation
C.
cooling below 0ºC
D.
very little power consumption

Test: RAC Level - 1 - Question 25

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The relative coefficient of performance is

A.
actual COP/theoretical COP
B.
theoretical COP/actual COP
C.
actual COP × theoretical COP
D.
1-actual COP × theoretical COP

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RAC Level - 1 MCQs with Answers

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