Types of Heat Exchanger Questions & Answers

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Types of Heat Exchanger Questions & Answers

1. Heat exchanger effectiveness is
a) <1
b) =1
c) >1
d) None of the mentioned
Answer: <1 

2. In a cross flow heat exchanger, the angle between hot and cold fluids is
a) 900
b) 1800
c) 800
d) None of the mentioned
Answer: 900

3. In a counter flow heat exchanger, the angle between hot and cold fluids is
a) 900
b) 1800
c) 800
d) None of the mentioned
Answer: 1800

4. In condensers/boilers, heat capacity ratio is
a) Infinity
b) Zero
c) 1
d) None of the mentioned
Answer: Zero

5. Rate of heat transfer by condensing fluid is
a) m.cp Δt
b) m. LH
c) m.Δt
d) None of the mentioned
Answer: m. LH

6. In case of a 1:1 heat exchanger, use
a) LMTD
b) NTU
c) LMTD or NTU
d) None of the mentioned
Answer: LMTD or NTU

7. NTU in a heat exchanger is
a) UA/C
b) C min/UA
c) UA/C max
d) None of the mentioned
Answer: None of the mentioned

8. ‘C’ heat capacity ratio in a heat exchanger be
a) =1
b)  > 1
c) >4
d) None of the mentioned
Answer: None of the mentioned

9. The sequence of the modes of heat transfer in case of a heat exchanger are
a) Cond + Conv + rad
b) Conv+ Rad +Conv
c) Conv +Cond +Conv
d) None of the mentioned
Answer: Conv +Cond +Conv

10. A heat exchanger transfers heat from one fluid to another
a) Solid
b) Fluid
c) Solid & fluid
d) None of the mentioned
Answer: Fluid

11. Latent heat is transferred in a heat exchanger during
a) Heating
b) Cooling
c) Phase change
d) None of the mentioned
Answer: Phase change

12. Sensible heat is transferred in a heat exchanger like
a) Cooler
b) Boiler
c) Condenser
d) None of the mentioned
Answer: Cooler

13. In a direct contact heat exchanger, there is
a) Mass transfer
b) Heat transfer
c) Heat & mass transfer
d) None of the mentioned
Answer: Heat & mass transfer

14. The direct contact heat exchanger is
a) Boiler
b) Condenser
c) Desert cooler
d) None of the mentioned
Answer: Desert cooler

15. In a regenerator heat exchanger
a) Both hot and cold fluids are passed simultaneously
b) First hot fluid & then cold fluid is passed
c) Can’t say
d) None of the mentioned
Answer: First hot fluid & then cold fluid is passed

16. The operation of a regenerator heat exchanger is
a) Continuous
b) Intermittent
c) Both continuous & intermittent
d) None of the mentioned
Answer: Intermittent

17. In a recuperator heat exchanger, the hot & cold fluids
a) Mix physically
b) Do not mix physically
c) Mix chemically
d) None of the mentioned
Answer: Do not mix physically

18. Which of the following is the recuperator heat exchanger
a) Automobile radiator
b) Desert cooler
c) Cooling tower
d) None of the mentioned
Answer: Automobile radiator

19. In a condenser, the temperature of the hot fluid is
a) Decreasing
b) Increasing
c) Remains constant
d) None of the mentioned
Answer: Remains constant

20. In a condenser, the temperature of the cold fluid is
a) Decreasing
b) Increasing
c) Remains constant
d) None of the mentioned
Answer: Increasing

21. In a boiler, the temperature of the hot fluid is
a) Decreasing
b) Increasing
c) Remains constant
d) None of the mentioned
Answer: Decreasing

22. In a boiler, the temperature of the boiling fluid is
a) Decreasing
b) Increasing
c) Remains constant
d) None of the mentioned
Answer: Remains constant

23. The effectiveness of a parallel and counter flow heat exchanger is of same value in a
a) Radiator
b) Condenser
c) Pre-heater
d) None of the mentioned
Answer: Condenser

24. Use a correction factor ‘F’ to calculate the rate of heat transfer in case of a
a) Parallel flow heat exchanger
b) Counter flow heat exchanger
c) Cross flow heat exchanger
d) None of the mentioned
Answer: Cross flow heat exchanger

25. Temperature variation in a heat exchanger is
a) Linear
b) Parabolic
c) Exponential
d) None of the mentioned
Answer: Parabolic

26. The heat capacity ratio ‘C’ in a heat exchanger is zero in case of a
a) Radiator
b) Pre-heater
c) Condenser
d) None of the mentioned
Answer: Condenser

27. The effectiveness of a parallel flow heat exchanger with increasing value of heat capacity ratio & for a fixed value of NTU
a) Remains constant
b) Decreases
c) Increases
d) None of the mentioned
Answer: Decreases

28. The effectiveness of a parallel flow heat exchanger with increasing value of heat capacity ratio & for a fixed value of NTU
a) Remains constant
b) Decreases
c) Increases
d) None of the mentioned
Answer: Decreases
 
29. The direct contact heat exchanger operate under
a) Transient conditions
b) Steady state conditions
c) Transient/steady state conditions
d) None of the mentioned
Answer: Steady state conditions

30. The recuperator heat exchangers operate under
a) Transient conditions
b) Steady state conditions
c) Transient/steady state conditions
d) None of the mentioned
Answer: Steady state conditions

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