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# GATE 2025 Electrical Machines Foundation Quiz 35

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Question 1

A synchronous generator is supplying power to an infinite bus at voltage of 1.0pu and supplying current of 1.0pu at zero power factor lagging. its synchronous reactance is 0.5 pu. the excitation emf will be:

Question 2

An 8-pole synchronous machine has a synchronous speed of 900 rpm. Determine the frequency of the machine.

Question 3

A 3-phase synchronous generator is supplying maximum power to infinite bus at rated voltage and 0.8 pu of armature current. If its excitation emf is 1.5 pu. Then the value of synchronous reactance of generator will be (Negligible armature resistance).

Question 4

A 3-ϕ, 20-pole, synchronous generator has 180 stator coils with double layer full pitch winding. The rotor is driven at 300 RPM and flux per pole (sinusoidally distributed) is 25 mWb the voltage induced per phase is nearest to

Question 5

The power consumption of an industry is 500 KVA, at 0.8 p.f lagging. A synchronous motor is added to raise the power factor of industry to unity. If the power intake of the motor is 150 kW, the p.f of motor will be ______.