CASCADE REFRIGERATION MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

CASCADE REFRIGERATION

MULTIPLE CHOICE QUESTIONS

(MCQ) WITH ANSWERS

Cascade refrigeration is an extension of

vapor compression refrigeration in order

to achieve lower temperatures. There are

independent refrigeration circuits using

different refrigerants. These are

interconnected. Two-three-four stage

systems are in use.

Fig. Two stage Cascade refrigeration Line diagram & its representation on p-h Chart

1. Cascade refrigeration is applicable to

(a) Air refrigeration
(b) Vapor compression refrigeration
(c) Vapor absorption refrigeration
(d) None
(Ans: b)

2. In cascade refrigeration, number of refrigerants used is

(a) ≤ One
(b) ≥ Two
(c) Zero
(d) None
(Ans: b)

3. Cascading refrigeration is applicable for

(a) Cold storage
(b) Comfort air conditioning
(c) Low temperature applications
(d) None
(Ans: c)

4. In cascade refrigeration, low stage refrigeration condenser forms a Cascade heat exchanger with 

(a) Evaporator of high temperature refrigeration
(b) Evaporator of low temperature refrigeration
(c) Condenser of high temperature refrigeration
(d) None
(Ans: a)

5. The COP of a single stage vapor CR compared to Cascade refrigeration working between the same temperature limits is

(a) Greater 
(b) Lesser
(c) Equal 
(d) None
(ANs: b)

6. For achieving -50⁰C temperature, cascade refrigeration used is

(a) Two stage
(b) Three stage
(c) Four stage
(d) None
(Ans: a)

7. For achieving -80⁰C temperature, cascade refrigeration used is

(a) Two stage
(b) Three stage
(c) Four stage
(d) None
(Ans: b)

8. For achieving -100⁰C temperature, cascade refrigeration used is

(a) Two stage
(b) Three stage
(c) Four stage
(d) None
(Ans: c)

9. The refrigerants used in cascade refrigeration

(a) Mix with each other
(b) Do not mix with each other
(c) Mix in the vapor state
(d) None
(Ans: b)

10. In Cascade refrigeration, cooling effect is 

(a) Latent heat
(b) Total heat
(c) Sensible heat
(d) None
(Ans: a)

11. The ratio of  COP of a two stage Cascade refrigeration system vs three stage cascade system is 

(a)  < 1

(b) > 1

(a) = 1

(d) None

(Ans: a)

12. In a 2 stage cascade refrigeration system, cooling effect occurs in the

(a) one evaporator

(b) Two evaporators

(c) One evaporator and one condenser

(d) None

(Ans: a)

13. Two stage cascade refrigeration produces

1. -10⁰C

2. -20⁰C

3. -50⁰C

4. None

ANS: (c )

14. Three stage cascade refrigeration produces

1. -10⁰C

2. -70⁰C

3. -50⁰C

4. None

ANS: (b )

15. Four stage cascade refrigeration produces

1. -100⁰C

2. -200⁰C

3. -50⁰C

4. None

ANS: (a )

16. The normal boiling points of R-22 and R-13 are

1. -29.8 & -60.8⁰C

2. -60.8 & -80.8⁰C

3. -41 & -83.8⁰C

4. None

ANS: (c )

17. Work done in a two stage Cascade refrigeration is

1. Firstly      W₁

2. Secondly  W₂

3. Thirdly      W₁-W₂

4. None

ANS: (d)

18. COP of a two stage Cascade refrigeration is

1. Firstly        (W1+W2)/N

2. Secondly    N/(W₁-W₂)

3. Thirdly        N/(W₁+W₂)

4. None

ANS: (c )

19.   Same refrigerant used in a two stage Cascade refrigeration.

• Yes

• No

• Can’t say

• None

ANS: (b)

20. The important use of Cascade refrigeration is in the storage of

1. Blood & medicines

2. Meat & wines

3. Milk & milk products

4. None

ANS: (a)

21. The Cascade heat exchanger is the combination of

1. Condenser of high temperature refrigeration and evaporator of low temperature refrigeration

2. Evaporator of high temperature refrigeration and condenser of low temperature refrigeration

3. Condenser & evaporator of the same stage of refrigeration

4. None

ANS: (b)

https://www.mesubjects.net/wp-admin/post.php?post=4194&action=edit       MCQ non-conventional refrigeration

https://www.mesubjects.net/wp-admin/post.php?post=4198&action=edit         MCQ Vapor Comp Ref-2