Electrical Machines Practice Test 3

1. Identify the machines by observing their external characteristics for (i) and (ii) respectively.
(i)
(ii)

2. A dc series generator as armature and field connections are reversed, the generator __________

3. If the students give a forward shift of 10° to the dc generator, then it _________

4. The direct-on-line starter is used to start a small dc motor because it limits initial current drawn by armature circuit.

5. A dc shunt motor is connected to the source through 3-point starter. Suddenly if we starter handle is moved fastly from off to on position, then the _________

6. The air-gap flux density waveform has decreased flux under one pole tip and measured under the other is due to __________

7. Compensating windings are embedded in pole faces and having the same polarity as that of adjoining armature winding.

8. With no commutating poles used the brushes are given backward lead in the dc motor.

9. The self-excited dc generator with gradual build up of residual voltage and EMF corresponds to __________

10. The space distribution of flux produced in a DC machine is?