Electric Drives Practice Test 1

1. Which of the following devices should be used as a switch for high power and high voltage application?

2. Calculate the shaft power developed by a motor using the given data: E_b = 50V and I = 60 A. Assume frictional losses are 400 W and windage losses are 600 W.

3. When a UJT is used for triggering an SCR, then the wave shape of voltage obtained from the UJT circuit will be ____________

4. The unit of the flux is Weber.

5. Calculate mark to space ratio if the system is on for 5 sec and off for 10 sec.

6. Armature reaction is demagnetizing in nature due to purely lagging load.

7. For large DC machines, the yoke is usually made of which material?

8. Salient pole machines are more stable than cylindrical rotor machines.

9. Among the following which one exhibits linearly rising load torque characteristics?

10. A Buck-Boost converter is used to _________