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GATE EE : Electrical Machines Champion Quiz 4

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Question 1

The angle δ in the swing equation of a synchronous generator is the

Question 2

The resultant flux density in the air gap of a synchronous generator is the lowest during ____

Question 3

Which one of the following statements is not correct in respect of synchronous machines?

Question 4

A round rotor generator with internal voltage E₁ = 2.0 p.u. and X = 1.1 p.u. is connected to a round rotor synchronous motor with internal voltage E₂ = 1.3 p.u. and X = 1.2 p.u. The reactance of the line connecting the generator to the motor is 0.5 p.u. when the generator supplies 0.5 p.u. power, the rotor angle difference between the machines will be

Question 5

A stand–alone engine driven Synchronous generator is feeding a partly inductive load. A capacitor is now connected across the load to completely nullify the inductive current. For this operating condition

Question 6

A 10 pole, 25 Hz alternator is directly coupled to and is driven by 60 Hz synchronous motor. What is the number of poles for the synchronous motor?

Question 7

Two 3-phase, Y-connected alternators are to be paralleled to a set of common bus bars. The armature has a per phase synchronous reactance of 1.7 Ω and negligible armature resistance. The line voltage of the first machines is adjusted to 3300 V and that of the second machine is adjusted to 3200 V, the machine voltages are in phase at the instant they are paralleled. Under this condition, the synchronizing current per phase will be

Question 8

A 4–pole, 3–phase, double layer winding is housed in a 36–slot stator for an ac machine with 60 ° phase spread. Coil span is 7 slot pitches. Number of slots in which top and bottom layers belong to different phases is

Question 9

In an alternator, power output is 40 kW and power rating is - 25 KVAR. Calculate the value of tanφ?

Question 10

A 400V, 50 kVA, 0.8 pf leading Δ-connected, 50 Hz synchronous machine has a synchronous reactance of 2Ω and negligible armature resistance. The friction and wind age losses are 2 kW and the core loss is 0.8 kW. The shaft is supplying 9kW load at a power factor of 0.8 leading. The line current drawn is

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ESE & GATE EE Electrical Machines

Jun 8ESE & GATE EE