DC GENERATOR - Practice Mode

1) What is the effect if the shunt field resistance is above critical resistance value in a D.C generator?

Output voltage is pulsating Output voltage is above normal Generator fails to build up voltage Generator builds up voltage normally

Correct Answer: Generator fails to build up voltage

2) What is the effect of armature reaction in DC generator?

Output voltage increases Output voltage decreases Output voltage is pulsating Output voltage will become zero

Correct Answer: Output voltage decreases

3) Calculate the emf generated in a 4 pole DC generator with simplex wave wound armature has 1020 conductors and driven at a speed of 1500 rpm, the flux / pole is 0.007 webers?

178 V 243 V 357 V 428 V

Correct Answer: 357 V

4) How the effect of armature reaction can be neutralized in large DC generators?

Using compensating winding Providing additional inter poles Increasing brush contact resistance Adding resistance wires with winding

Correct Answer: Using compensating winding

5) What is the effect in D.C generator, if it is kept ideal for long time?

Field coil resistance increases Armature resistance increases Increase the armature reaction Looses its residual magnetism

Correct Answer: Looses its residual magnetism

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