# Heating Effects MCQ Questions & Answers

Heating Effects MCQs : This section focuses on the "Heating Effects". These Multiple Choice Questions (MCQs) should be practiced to improve the Heating Effects skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A circuit consists of two 7 F capacitors connected in series and 12 H inductor. Determine the order of the circuit.

A. 1
B. 2
C. 0
D. 3

Question 2

Calculate the heat absorbed by a 3 ? resistor when 6 V is applied across it.

A. 12 W
B. 10 W
C. 8 W
D. 11 W

Question 3

Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 24 watts/? and heat dissipation constant value (D) is 3 watts/?.

A. 8 sec
B. 7 sec
C. 6 sec
D. 9 sec

Question 4

Calculate the quality factor for the R-C circuit connected in the cooling system if R=1 ? and C=10 F.

A. 0.1
B. 0.2
C. 0.3
D. 0.4

Question 5

Calculate the steady state temperature value for T(t)=1.5(1-e-17t).

A. 1.5
B. 4.8
C. 3.9
D. 2.4

Question 6

Convert 20 ? into Fahrenheit.

A. 68 ?
B. 58 ?
C. 78 ?
D. 48 ?

Question 7

Convert 50? into Celsius.

A. 20 ?
B. 10 ?
C. 30 ?
D. 40 ?

Question 8

Cooling air travels 10 m distance in 5 sec from point A to point B. Calculate the velocity of the cooling air.

A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 10 m/s

Question 9

Inadequate rating of the equipment can ___________

A. Increase the speed
B. Decrease the speed
C. Damage the winding
D. Increase the efficiency

Question 10

Insufficient rating of the machine can damage the windings.

A. True
B. False

Question 11

Iron losses occur in the machine are variable losses.

A. True
B. False

Question 12

What is the unit of power?

A. Joule/sec
B. Joule/sec2
C. Joule/sec3
D. Joule/sec4

Question 13

Which of the following are the classes of insulating material in electrical machines?

A. ?, A, E, F, H, C
B. ?, E, B, F, H, C
C. A, E, B, F, H, C
D. ?, A, E, F, C

Question 14

Calculate the heat absorbed by a 3 Ω resistor when 6 V is applied across it.

A. 12 W
B. 10 W
C. 8 W
D. 11 W

Question 15

Calculate the heating time constant of the machine if the thermal capacity (c) of the machine is 24 watts/℃ and heat dissipation constant value (D) is 3 watts/℃.

A. 8 sec
B. 7 sec
C. 6 sec
D. 9 sec

Question 16

Calculate the quality factor for the R-C circuit connected in the cooling system if R=1 Ω and C=10 F.

A. 0.1
B. 0.2
C. 0.3
D. 0.4

Question 17

Convert 20 ℃ into Fahrenheit.

A. 68 ℉
B. 58 ℉
C. 78 ℉
D. 48 ℉

Question 18

Convert 50℉ into Celsius.

A. 20 ℃
B. 10 ℃
C. 30 ℃
D. 40 ℃