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Mission ISRO 2019: Electrical Machines Quiz 2
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Question 1
A transformer operates most efficiently at 1/4th full load. Its iron (PI) and copper loss (PCu) are related as:
Question 2
What is the maximum torque of an induction motor that has a rotor resistance of 0.002 Ω/phase. If the resistance is increased to 0.004 Ω/phase?
Question 3
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?
Question 4
An 8-pole, 50 Hz, 3-phase induction motor has a power input of 72 kW. The motor is running at a speed of 700 rpm. Determine the mechanical power developed, if the total stator loss is 800 W.
Question 5
Below figure shows the torque-speed characteristics of a 3-phase induction motor.
Determine the breakdown torque of the motor.
Determine the breakdown torque of the motor.
Question 6
The voltage regulation of a synchronous generator depends upon the power factor of the load. If the voltage regulation is negative, the power factor is:
Question 7
A 10 kW, 3 ph, 4 pole, 50 Hz synchronous motor was used to drive a constant speed load. The torque induced in the damper winding when the motor is running at synchronous speed is
Question 8
A 415 V, 3 ph synchronous condenser is used for pf correction. It is desired to make the pf unity. The pf of the connected load is 0.5 lag and the load current is 60 A. The kVA rating of the synchronous condenser used
Question 9
The armature of a 3 ph, 415 V, 30 kVA synchronous machine is wound with 5/6 fractional pitch winding . The coil span in degrees and the pitch factor is
Question 10
A 415 V, 3 ph, 50 Hz, 10 kVA synchronous motor was working at full load condition. The air gap flux was established by the field winding current alone. The motor operates at
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