Explore topic-wise MCQs in Heat Transfer.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

NTU is a number of transfer units, dimensionless parameter defined as

A. U A/C <sub>MIN</sub>
B. 2 U A/C <sub>MIN</sub>
C. 3 U A/C <sub>MIN</sub>
D. 4 U A/C <sub>MIN</sub>
Answer» B. 2 U A/C <sub>MIN</sub>
Discussion
2.

Consider the above problem, find the steam condensation rate

A. 52.22 kg/hr
B. 42.22 kg/hr
C. 32.22 kg/hr
D. 22.22 kg/hr
Answer» E.
Discussion
3.

In a surface condenser, the water flowing through a series of tubes at the rate of 200 kg/hr is heated from 15 degree Celsius to 75 degree Celsius. The steam condenses on the outside surface of tubes at atmospheric pressure and the overall heat transfer coefficient is estimated at 860 k J/m2 hr degree. Find the number of transfer units of the heat exchanger. At the condensing pressure, stream has saturation temperature 0f 100 degree Celsius and the latent heat of vaporization is 2160 k J/kg. Further, the steam is initially just saturated and the condensate leaves the exchanger without sub-cooling i.e. only latent heat of condensing steam is transferred to water. Take specific heat of water as 4 k J/kg K

A. 3.224
B. 2.224
C. 1.224
D. 0.224
Answer» D. 0.224
Discussion
4.

E NTU method is particularly useful in thermal design of heat exchangers when

A. Inlet temperature of the fluid streams are not known as a priori
B. The outlet temperatures of the hot fluid streams is known but that of cold fluid stream is not known as a priori
C. The outlet temperatures of the fluid streams is known as a priori
D. The outlet temperatures of the fluid streams are not known as a priori
Answer» E.
Discussion