NON CONVENTIONAL REFRIGERATION MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
NON CONVENTIONAL REFRIGERATION
MULTIPLE CHOICE QUESTIONS
(MCQ) WITH ANSWERS
MCQ makes the concept very clear. More
MCQ may be practiced to improve
knowledge further. Then, it is very
useful in the design, construction and
working of the system.
1. The materials of thermoelectric refrigeration systems should have:
(a) High electrical and thermal conductivity
(b) Low electrical conductivity and high thermal conductivity
(c ) High electrical conductivity and low thermal conductivity
(d)None
ANS: (c )
2. A thermoelectric refrigeration systems requires:
a) A high voltage AC (alternating current) input
b) A low voltage AC input
c) A high voltage DC (direct current) input
d) A low voltage DC input
ANS: (d)
3. Thermoelectric refrigeration system is based on
a) Peltier effect
b) Joule effect
c)Joule-Thomson throttling
d) None
ANS: (a)
4. Lowering of cold junction temperature, the neutral temperature
(a) Increases
(b) No change
(c) Decreases
(d) None
ANS: (b)
5. Two ends of a conductor are at different temperatures, an electromotive force is generated between the two ends is
(a) Peltier emf
(b) Seebeck emf
(c ) Thomson emf
(d) None
ANS: (c )
6 . In a Thermo-electric refrigeration, cooling effect is produced by
(a) Latent heat
(b) Total heat
(c) Sensible heat
(d) None
(Ans: c)
7. In vortex-tube refrigeration, cooling effect is produced by
(a) Latent heat
(b) Total heat
(c) Sensible heat
(d) None
(Ans: c)
8. Pressure of air in a Vortex tube is
-
-
3 bars
-
5 bars
-
7 bars
-
None
-
ANS: (c )
9. Nozzles are fitted in the Vortex tube as
-
-
Longitudinally
-
Tangentially
-
Radially
-
None
-
ANS: (b)
10. Which stream of air in a Vortex tube is cold?
-
-
Inner
-
Outer
-
Both inner & outer
-
None
-
ANS: (a)
11. Which stream of air in a Vortex tube is hot?
-
-
Inner
-
Outer
-
Both inner & outer
-
None
-
ANS: (b)
12. The inner stream becomes cold because of
-
-
Heat Transfer
-
Mass transfer
-
Momentum transfer
-
None
-
ANS: (c )
13. The minimum temperature achieved in a Vortex tube is
-
-
-700C
-
-500C
-
-300C
-
None
-
ANS: (d)
14. Maximum cooling obtained in a Vortex Test tube refrigeration is
-
-
5 Tons
-
0 Tons
-
5 Tons
-
None
-
ANS: (c )
15. Number of moving parts in a Vortex tube is
-
-
1
-
2
-
3
-
None
-
ANS: (d)
16. The obstruction to flow is on which side of nozzles in a Vortex tube?
-
-
Near side
-
Far side
-
Both near and far side
-
None
-
ANS: (b)
17. Some air going out of Vortex tube is on the side of
-
-
Obstruction
-
Nozzles
-
Both (a) & (b)
-
None
-
ANS: (a)
18. Shape of obstruction in a Vortex tube is
-
-
Circular
-
Conical
-
Rectangular
-
None
-
ANS: (b)
19. Diameter of the Vortex test tube is
-
-
25 mm
-
50 mm
-
75 mm
-
None
-
ANS: (b)
20. The length of the Vortex Test tube is
-
-
250 mm
-
500 mm
-
750 mm
-
None
-
ANS: (b)
21. The material of the Vortex Test tube is
-
-
Rubber
-
Plastic
-
Stainless tube
-
None
-
ANS: (c )
22. Number of nozzles used in Vortex Test tube is
-
-
6
-
10
-
8
-
None
-
ANS: (c )
23. RPM produced in the vortex in a Vortex Test tube is
-
-
50000
-
100000
-
75000
-
None
-
ANS: (b)
24. The minimum temperature achieved in a Vortex Test tube is
-
-
-70C
-
-170C
-
-270C
-
None
-
ANS: (a)
25. The COP of Vortex Test tube refrigeration is
-
-
1
-
5
-
1
-
None
-
ANS: (c )
26. Design of Vortex tube is
-
-
Simple
-
Complex
-
Can’t say
-
None
-
ANS: (a)
27. Controls used in a Vortex tube is
-
-
4
-
6
-
8
-
None
-
ANS: (d)
28. Vortex tube occupies space
-
-
Large
-
Small
-
Medium
-
None
-
ANS: (b)
29. The cost of Vortex tube is
-
-
Less
-
Big
-
Medium
-
None
-
ANS: (a)
30. Weight of Vortex tube equipment is
-
-
Less
-
More
-
Medium
-
None
-
ANS: (a)
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