# Thermal Engineering - Mechanical Engineering (MCQ) questions and answers

1)   Which of the following relations depict relation between Celsius and Fahrenheit scale?

a. (oC / 5) = (oF – 32) / 9
b. (oC / 9) = (oF – 32) / 5
c. (oC / 32) = (oF – 9) / 5
d. None of the above
 Answer  Explanation ANSWER: (oC / 5) = (oF – 32) / 9 Explanation: No explanation is available for this question!

2)   According to Kelvin-Planck statement, it is impossible to construct a device operating on a cycle which transfers heat from ____

a. low pressure heat reservoir to high pressure reservoir
b. low temperature heat reservoir to high temperature reservoir
c. high pressure heat reservoir to low pressure reservoir
d. high temperature heat reservoir to low temperature reservoir
 Answer  Explanation ANSWER: low temperature heat reservoir to high temperature reservoir Explanation: No explanation is available for this question!

3)   In an isolated system, ________ can be transferred between the system and its surrounding.

a. only energy
b. only mass
c. both energy and mass
d. neither energy nor mass
 Answer  Explanation ANSWER: neither energy nor mass Explanation: No explanation is available for this question!

4)   Which of the following is an extensive property?

a. Volume
b. Pressure
c. Viscosity
d. All of the above
 Answer  Explanation ANSWER: Volume Explanation: No explanation is available for this question!

5)   How is absolute pressure measured?

a. Gauge pressure + Atmospheric pressure
b. Gauge pressure – Atmospheric pressure
c. Gauge pressure / Atmospheric pressure
d. None of the above
 Answer  Explanation ANSWER: Gauge pressure + Atmospheric pressure Explanation: No explanation is available for this question!

6)   The extensive properties of a system, _______

a. are independent of the mass of the system
b. depend upon temperature of the system
c. depend upon the mass of the system
d. none of the above
 Answer  Explanation ANSWER: depend upon the mass of the system Explanation: No explanation is available for this question!

7)   An isobaric process, has constant _____

a. density
b. pressure
c. temperature
d. volume
 Answer  Explanation ANSWER: pressure Explanation: No explanation is available for this question!

8)   The radiation pyrometers work on the principle of ______

a. Newton's law
b. Stefan Boltzmann's law
c. Zeroth law
d. None of the above
 Answer  Explanation ANSWER: Stefan Boltzmann's law Explanation: No explanation is available for this question!

9)   According to Joule's law, the internal energy of a perfect gas is the function of absolute ______

a. density
b. pressure
c. temperature
d. volume
 Answer  Explanation ANSWER: temperature Explanation: No explanation is available for this question!

10)   Which of the following relations is true, for coefficient of performance (C.O.P)?

a. (C.O.P)heat pump – (C.O.P)refrigerator = 1
b. (C.O.P)heat pump – (C.O.P)refrigerator > 1
c. (C.O.P)heat pump – (C.O.P)refrigerator < 1
d. (C.O.P)heat pump – ( C.O.P)refrigerator = 0
 Answer  Explanation ANSWER: (C.O.P)heat pump – (C.O.P)refrigerator = 1 Explanation: No explanation is available for this question!