When gas is used as a fluid in a double pipe heat exchanger, which one of the following is not true?

Fins increase necessary heat transfer area

The gas side has a low heat transfer coefficient

Extended fins are used on the gas side to increase the Heat Transfer coefficient

The gas side heat transfer coefficient is the highest

Fins increase necessary heat transfer area

Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15m3/s and 21m3/s respectively. Which fluid pass arrangement would be best suited for the HE?

Parallel flow with B in inner pipe and A in the annulus

Parallel flow with A in inner pipe and B in the annulus

Counterflow with B in inner pipe and A in the annulus

Counterflow with A in inner pipe and B in the annulus

Parallel flow with B in inner pipe and A in the annulus

Which is the major mean of heat transfer in a Double Pipe heat exchanger?

Combined Convection and Conduction

11 + Mcqs in HT Equipment Double Pipe Heat Exchangers in Heat Transfer Operations Page 1 McqOptions

1.	In a double pipe heat exchanger, in the inner side fluid enters at 20 and leaves at 45 . The annulus has steam condensing at 1atm. What is the value of LMTD?
A.	39
B.	66.7
C.	70
D.	40.5
Answer» C. 70

Discussion

2.	Which one of the following is the correct representation of Temperature profile for Double pipe heat exchanger?
A.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11a.png"><img alt="The representation of Temperature profile for Double pipe heat exchanger - option a" class="alignnone size-full wp-image-246601" height="211" src="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11a.png" width="290"/></a>
B.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11b.png"><img alt="The representation of Temperature profile for Double pipe heat exchanger - option b" class="alignnone size-full wp-image-246602" height="223" sizes="(max-width: 318px) 100vw, 318px" src="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11b.png 318w, https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11b-300x210.png 300w" width="318"/></a>
C.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11c.png"><img alt="The representation of Temperature profile for Double pipe heat exchanger - option c" class="alignnone size-full wp-image-246603" height="224" sizes="(max-width: 302px) 100vw, 302px" src="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11c.png 302w, https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11c-300x223.png 300w" width="302"/></a>
D.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11d.png"><img alt="The representation of Temperature profile for Double pipe heat exchanger - option d" class="alignnone size-full wp-image-246604" height="248" sizes="(max-width: 311px) 100vw, 311px" src="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11d.png 311w, https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11d-300x239.png 300w, https://www.sanfoundry.com/wp-content/uploads/2019/09/heat-transfer-operations-questions-answers-double-pipe-heat-exchangers-q11d-100x80.png 100w" width="311"/></a>
Answer» E.

Discussion

3.	For the calculation of Overall Heat transfer coefficient for fouling factor R, which one of the following expression do we use?
A.	(h<sub>i</sub><sup>-1</sup>+h<sub>o</sub><sup>-1</sup> + R<sup>-1</sup>)
B.	(h<sub>i</sub><sup>-1</sup>+h<sub>o</sub><sup>-1</sup> + R)<sup>-1</sup>
C.	(h<sub>i</sub> + h<sub>o</sub> + R)<sup>-1</sup>
D.	(h<sub>i</sub><sup>-1</sup>+h<sub>o</sub><sup>-1</sup> + R<sup>-1</sup>)<sup>-1</sup>
Answer» C. (h<sub>i</sub> + h<sub>o</sub> + R)<sup>-1</sup>

Discussion

4.	Consider we have a Double pipe Heat Exchanger, with inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (K_A = 15W/mK and K_B = 20W/mK) we desire to have their flow rates as 15m³/s and 21m³/s respectively. If their Nusselt number after calculation is Nu_i = 429 and Nu_o = 530. What is the overall heat transfer coefficient of the equipment is no fouling exists?
A.	168.4 W/m<sup>2</sup>K
B.	168.4 10<sup>3</sup> KW/m<sup>2</sup>K
C.	188.4 W/m<sup>2</sup>K
D.	168.4 KW/m<sup>2</sup>K
Answer» E.

Discussion

5.	When gas is used as a fluid in a double pipe heat exchanger, which one of the following is not true?
A.	The gas side has a low heat transfer coefficient
B.	Extended fins are used on the gas side to increase the Heat Transfer coefficient
C.	The gas side heat transfer coefficient is the highest
D.	Fins increase necessary heat transfer area
Answer» D. Fins increase necessary heat transfer area

Discussion

6.	Which of the following is not a subset of the category of Tubular Heat Exchangers?
A.	Double pipe
B.	Finned pipe
C.	Shell and Tube
D.	Spiral tube
Answer» C. Shell and Tube

Discussion

7.	In an operation when we want to heat a stream of liquid by Steam, we usually keep steam on the annular side and fluid on the inner side.
A.	True
B.	False
Answer» B. False

Discussion

8.	How many times do we have to calculate for Nusselt number in a Double Pipe Heat Exchanger?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

9.	Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15m³/s and 21m³/s respectively. Which fluid pass arrangement would be best suited for the HE?
A.	Parallel flow with A in inner pipe and B in the annulus
B.	Counterflow with B in inner pipe and A in the annulus
C.	Counterflow with A in inner pipe and B in the annulus
D.	Parallel flow with B in inner pipe and A in the annulus
Answer» D. Parallel flow with B in inner pipe and A in the annulus

Discussion

10.	Which is the major mean of heat transfer in a Double Pipe heat exchanger?
A.	Convection
B.	Conduction
C.	Radiation
D.	Combined Convection and Conduction
Answer» E.

Discussion

11.	If in a double pipe heat exchanger, we require to have a constant wall temperature, we use it in a counter-flow direction.
A.	True
B.	False
Answer» C.

Discussion

Explore topic-wise MCQs in Heat Transfer Operations.

In a double pipe heat exchanger, in the inner side fluid enters at 20 and leaves at 45 . The annulus has steam condensing at 1atm. What is the value of LMTD?

Which one of the following is the correct representation of Temperature profile for Double pipe heat exchanger?

For the calculation of Overall Heat transfer coefficient for fouling factor R, which one of the following expression do we use?

When gas is used as a fluid in a double pipe heat exchanger, which one of the following is not true?

Which of the following is not a subset of the category of Tubular Heat Exchangers?

In an operation when we want to heat a stream of liquid by Steam, we usually keep steam on the annular side and fluid on the inner side.

How many times do we have to calculate for Nusselt number in a Double Pipe Heat Exchanger?

Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15m3/s and 21m3/s respectively. Which fluid pass arrangement would be best suited for the HE?

Which is the major mean of heat transfer in a Double Pipe heat exchanger?

If in a double pipe heat exchanger, we require to have a constant wall temperature, we use it in a counter-flow direction.

Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15m³/s and 21m³/s respectively. Which fluid pass arrangement would be best suited for the HE?