Explore topic-wise MCQs in Heat Transfer Questions and Answers.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

The parameter m = (h P/k A C) 1/2 has been stated to increase in a long fin. If all other parameters are constant, then

A. Profile of temperature will remain the same
B. Along the length temperature drop will be less
C. The parameter influences the heat flow only
D. The temperature drop along the length will be steeper
Answer» E.
Discussion
2.

Let us assume there are two pieces of copper wire 0.1625 cm in diameter with a device that melts it at 195 degree Celsius. The wires are positioned vertically in air at 24 degree Celsius and the heat transfer coefficient of the wire is 17 W/ square m K. Let us say k = 335W/m K i.e. of wire. Find out the energy input?

A. 1.234W
B. 2.652W
C. 4.562W
D. 9.435W
Answer» C. 4.562W
Discussion
3.

Three rods, one made of silver (l = 420W/m K), second made of aluminum (k = 210W/m K) and the third made of iron (k = 70W/m K) are coated with a uniform layer of wax all around. The rods are placed vertically in a boiling water bath with 250 mm length of each rod projecting outside. If all the rods are having following dimensions i.e. diameter = 15 mm and length = 300 mm and have identical surface coefficient 12.5W/ m2 K, work out the ratio of lengths up to which wax will melt on each rod

A. 2.45:1:1.732
B. 1.732:1:2.45
C. 2.45:1.732:1
D. 1.732:1:2.45
Answer» D. 1.732:1:2.45
Discussion