Electric Drives Practice Test 3

1. The generated e.m.f from 22-pole armature having 75 turns driven at 78 rpm having flux per pole as 400 mWb, with lap winding is ___________

2. The short circuit test on a 3-φ induction motor is conducted at a rotor speed of _______

3. Calculate the active power in a 543 F capacitor.

4. Calculate the value of the frequency if the capacitive reactance is .1 Ω and the value of the capacitor is .02 F.

5. A particular voltage is made up of two components: a 5 A and a cosine wave of peak value 7.8 A. The average value of voltage is _________

6. Calculate the value of the duty cycle if the system is on for 48 sec and off for 1 sec.

7. The unit of oscillating power is VAR.

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

9. Calculate the active power in a 2 Ω resistor with 8 A current flowing through it.

10. The phase difference between voltage and current in the choke coil.