Electric Drives Mock Test 3

10%

Question 1 of 10

1. Calculate the power factor if the power angle is 36.86°.

Question 1 of 10

Question 2 of 10

2. The power factor of a squirrel cage induction motor is ___________

Low at heavy loads only

Low at rate load only

Low at light load only

Low at the light and heavy loads both

Question 2 of 10

Question 3 of 10

3. A particular current is made up of two components: a 10 A and a sine wave of peak value 14.14 A. The average value of current is _________

24.14 A

Zero

10 A

14.14 A

Question 3 of 10

Question 4 of 10

4. The generated e.m.f from 2-pole armature having 2 conductors driven at 3000 rpm having flux per pole as 4000 mWb, with 91 parallel paths is ___________

8.64 V

8.12 V

8.79 V

8.56 V

Question 4 of 10

Question 5 of 10

5. A 20-pole, 3-phase, 90 Hz induction motor is operating at a speed of _______ rpm. The frequency of the rotor current of the motor in Hz is 20.

420.12

422.45

418.56

421.23

Question 5 of 10

Question 6 of 10

6. A 32-pole, 3-phase, 70 Hz induction motor is operating at a speed of 112 rpm. The frequency of the rotor current of the motor in Hz is __________

40.1

40.2

46.1

40.6

Question 6 of 10

Question 7 of 10

7. Calculate the active power in a 157.1545 H inductor.

0 W

4897 W

4577 W

4567 W

Question 7 of 10

Question 8 of 10

8. Calculate the power developed by a motor using the given data: E_b = 55 V and I = 6 A.

220 W

440 W

330 W

550 W

Question 8 of 10

Question 9 of 10

9. The slope of the V-I curve is 4.9°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

.08 Ω

.03 Ω

.07 Ω

.04 Ω

Question 9 of 10

Question 10 of 10

10. If induction motor air gap power is 67 KW and mechanically developed power is 26 KW, then rotor ohmic loss will be _________ KW.

Question 10 of 10