# Environmental Factors MCQ Questions & Answers

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

Question 1

1 Btu/h is equal to ___________

A. 0.641
B. 0.334
C. 0.293
D. 0.417

Question 2

Calculate the compensator rating required for a sec(?)=1.

A. 0.64 P.U
B. 0.21 P.U
C. 0.57 P.U
D. 0 P.U

Question 3

Calculate the heat loss in the electric motor for time interval 0-5 sec using the following data: Ia=2 A, Ra=.8?.

A. 16 J-sec
B. 14 J-sec
C. 12 J-sec
D. 10 J-sec

Question 4

Calculate the value of THD if the distortion factor is .8.

A. 76 %
B. 75 %
C. 74 %
D. 73 %

Question 5

Calculate the value of Voltage ripple factor if the Form factor is 1.1.

A. 45.8 %
B. 46.2 %
C. 47.5 %
D. 49.9 %

Question 6

Electric motors are placed in __________ to protect them from dust and contamination.

A. Enclosures
B. Open environment
C. Moisturizing environment
D. Hot environment

Question 7

Full form of THD is ____________

A. Total harmonic diverter
B. Total harmonic digital
C. Total harmonic distortion
D. Total harmonic discrete

Question 8

Full form of VRF.

A. Voltage ripple factor
B. Voltage revert factor
C. Volume ripple factor
D. Volume revert factor

Question 9

A. Over-current protection
B. Speed protection
C. Over frequency protection
D. Oversize protection

Question 10

Second lowest order harmonic present in 3-? fully controlled rectifier is __________

A. 5th
B. 7th
C. 3rd
D. 2nd

Question 11

The most common cause of motor failure is ____________

B. Low resistance
C. Contamination
D. Over-Heating

Question 12

What is the range of size of the motor (kW) for efficiency nearly equals to 90%?

A. 15-150
B. 0-2
C. Mar-15
D. 150-250

Question 13

Which test is used to determine the conditions where electric motors are being used?

A. Thermography
B. Geography
C. Seismography
D. Anthropology

Question 14

Calculate the compensator rating required for a sec(Φ)=1.

A. 0.64 P.U
B. 0.21 P.U
C. 0.57 P.U
D. 0 P.U

Question 15

Calculate the heat loss in the electric motor for time interval 0-5 sec using the following data: Ia=2 A, Ra=.8Ω.

A. 16 J-sec
B. 14 J-sec
C. 12 J-sec
D. 10 J-sec

Question 16

Calculate the value of THD if the distortion factor is .8.

A. 76%
B. 75%
C. 74%
D. 73%

Question 17

Calculate the value of Voltage ripple factor if the Form factor is 1.1.

A. 45.80%
B. 46.20%
C. 47.50%
D. 49.90%