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# GATE 2025 Electrical Machines Foundation Quiz 30

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Question 1

What will happen, if the residual flux is reversed in a shunt generator, which is building a voltage normally?

Question 2Multiple Correct Options

The generated emf in armature coil of a DC machine.

Question 3Multiple Correct Options

Improved commutation in DC machines can be achieved by

Question 4

For a Shunt DC machine, consider supply voltage as 240 V, armature resistance to be 0.15 Ω and field resistance is 120 Ω.If line current when machine runs as a generator and as motor is 75A in each case. Then ratio of speed of machine as a generator to speed of machine as a motor is _______

Question 5

In a 220 volt long shunt compound generator, the resistance of armature, shunt and series winding are 0.05Ω, 110Ω and 0.5Ω respectively. The load consists of 110 lamps connected in parallel, each rated at 55W, 110V. What will be the voltage drop in series field winding _________ in V.
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