Test: RAC Level - 1

# Test: RAC Level - 1

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## 25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: RAC Level - 1

Test: RAC Level - 1 for Mechanical Engineering 2023 is part of Mechanical Engineering SSC JE (Technical) 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 2023 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

### The Coefficient of Performance of a domestic refrigerator is

Test: RAC Level - 1 - Question 2

### Which one of the following is correct relation between (COP)HP and (COP)R

Test: RAC Level - 1 - Question 3

### One tonnes of refrigeration is equal to

Test: RAC Level - 1 - Question 4

Thermoelectric refrigeration system is based on

Test: RAC Level - 1 - Question 5

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

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

Test: RAC Level - 1 - Question 7

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

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

Horse power per ton = 4.75?COP

kW/ton = 3.516/COP

Test: RAC Level - 1 - Question 8

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

Test: RAC Level - 1 - Question 9

The COP of a Carnot refrigeration cycle decreases on

Test: RAC Level - 1 - Question 10

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

Test: RAC Level - 1 - Question 11

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

Test: RAC Level - 1 - Question 12

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

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

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

Formation of frost on evaporator of refrigerator

Test: RAC Level - 1 - Question 15

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

Test: RAC Level - 1 - Question 16

Sub-cooling in a refrigeration cycle have effect of

Test: RAC Level - 1 - Question 17

Superheating in refrigeration cycle

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

Solid CO2 is produced by

Test: RAC Level - 1 - Question 19

The thermodynamic cycle used in aircraft refrigeration is

Test: RAC Level - 1 - Question 20

In aircraft, air refrigeration cycle is used because of

Test: RAC Level - 1 - Question 21

Bell Coleman cycle consists of

Test: RAC Level - 1 - Question 22

In electrolux refrigerator.

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

Which of the following cycles uses air as the refrigerant

Test: RAC Level - 1 - Question 24

An important characteristic of absorption system of refrigeration is

Test: RAC Level - 1 - Question 25

The relative coefficient of performance is

## Mechanical Engineering SSC JE (Technical)

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## Mechanical Engineering SSC JE (Technical)

6 videos|97 docs|57 tests