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Test: RAC Level - 2

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25 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Test: RAC Level - 2

Test: RAC Level - 2 for Mechanical Engineering 2023 is part of Mechanical Engineering SSC JE (Technical) preparation. The Test: RAC Level - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: RAC Level - 2 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: RAC Level - 2 below.

Solutions of Test: RAC Level - 2 questions in English are available as part of our Mechanical Engineering SSC JE (Technical) for Mechanical Engineering & Test: RAC Level - 2 solutions in Hindi for Mechanical Engineering SSC JE (Technical) course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: RAC Level - 2 | 25 questions in 50 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Mechanical Engineering SSC JE (Technical) for Mechanical Engineering Exam | Download free PDF with solutions

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Test: RAC Level - 2 - Question 1

Clapeyron equation is a relation between

A.
temperature, pressure and enthalpy
B.
specific volume and enthalpy
C.
temperature and enthalpy
D.
temperature, pressure, and specific volume
E.
temperature, pressure, specific volume and enthalpy

Test: RAC Level - 2 - Question 2

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

A.
in 1 hour
B.
in 1 minute
C.
in 24 hours
D.
in 12 hours
E.
in 10 hours

Test: RAC Level - 2 - Question 3

One ton refrigeration corresponds to

A.
50 kcal/min
B.
50 kcal/kr
C.
80 kcal/day
D.
80 kcal/hr
E.
1000 kcal/day

Test: RAC Level - 2 - Question 4

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

A.
210 kJ/min
B.
21 kJ/min
C.
420 kJ/min
D.
840 kJ/min
E.
105 kJ/min

Test: RAC Level - 2 - Question 5

The moisture in a refrigerant is removed by

A.
evaporator
B.
safety relief valve
C.
dehumidifier
D.
driers
E.
expansion valve

Test: RAC Level - 2 - Question 6

Critical pressure of a liquid is the pressure

A.
above which liquid will remain liquid
B.
above which liquid becomes gas
C.
above which liquid becomes vapour
D.
above which liquid becomes solid
E.
at which all the tree phases exist together

Test: RAC Level - 2 - Question 7

The refrigerant for a refrigerator should have

A.
high sensible heat
B.
high total heat
C.
high latent heat
D.
low latent heat
E.
low sensible heat

Test: RAC Level - 2 - Question 8

Rating of a domestic refrigerator is of the order of

A.
0.1 ton
B.
5 tons
C.
10 tons
D.
40 tons
E.
100 tons

Test: RAC Level - 2 - Question 9

The domestic refrigerator uses following type of compressor

A.
centrifugal
B.
axial
C.
miniature sealed unit
D.
piston type reciprocating
E.
none of the above

Test: RAC Level - 2 - Question 10

Refrigeration in aeroplanes usually employs the following refrigerant

A.
CO₂
B.
Freon-11
C.
Freon-22
D.
Air
E.
none of the above

Test: RAC Level - 2 - Question 11

The higher temperature in vapour compression cycle occurs at

A.
receiver
B.
expansion valve
C.
evaporator
D.
condenser discharge
E.
compressor discharge

Test: RAC Level - 2 - Question 12

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

A.
decreases
B.
increases
C.
remains same
D.
depends on other factors
E.
none of the above

Test: RAC Level - 2 - Question 13

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

A.
compression
B.
direct
C.
indirect
D.
absorption
E.
none of the above

Test: RAC Level - 2 - Question 14

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

A.
condenser
B.
evaporator
C.
compressor
D.
expansion valve
E.
receiver

Test: RAC Level - 2 - Question 15

Freon group of refrigerants are

A.
inflammable
B.
toxic
C.
non-inflammable and toxic
D.
non-toxic and inflammable
E.
non-toxic and non-inflammable

Test: RAC Level - 2 - Question 16

Ammonia is

A.
non-toxic
B.
non-inflammable
C.
toxic and non-inflammable
D.
highly toxic and inflammable
E.
none of the above

Test: RAC Level - 2 - Question 17

Superheating in a refrigeration cycle

A.
increases COP
B.
decreases COP
C.
other factors decide COP
D.
unpredictable

Detailed Solution for Test: RAC Level - 2 - Question 17

Superheating in a refrigeration cycle Decreases C.O.P

Test: RAC Level - 2 - Question 18

Moisture in freon refrigeration system causes

A.
ineffective refrigeration
B.
high power consumption
C.
freezing automatic regulating valve
D.
corrosion of whole system
E.
breakdown of refrigerant

Test: RAC Level - 2 - Question 19

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

A.
more
B.
less
C.
same
D.
more/less depending on size of plant

Test: RAC Level - 2 - Question 20

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

A.
same
B.
more
C.
less
D.
dependent on weather conditions
E.
unpredictable

Test: RAC Level - 2 - Question 21

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

A.
ammonia vapour goes into solution
B.
ammonia vapour is driven out of solution
C.
lithium bromide mixes with strong solution
D.
weak solution mixes with strong solution
E.
lithium bromide is driven out of solution

Test: RAC Level - 2 - Question 22

Presence of moisture in a refrigerant affects the working of

A.
compressor
B.
condenser
C.
evaparator
D.
expansion valve
E.
heat transfer

Test: RAC Level - 2 - Question 23

The electrolux refrigerator works on

A.
electro magnetic principle
B.
thermo-electric principle
C.
vapour compression system
D.
vortex tube system
E.
absorption refrigeration system

Test: RAC Level - 2 - Question 24

Lithium bromide in vapour absorption refrigeration system is used as

A.
refrigerant
B.
cooling substance
C.
auxiliary refrigerant
D.
absorbent
E.
lubricant

Test: RAC Level - 2 - Question 25

In electrolux refrigerator

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

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