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The air-gap power in a 6-pole, 50 Hz induction motor is 40 kW and it's output power is 36 kW. Neglect rotational loss and calculate the torque developed (in N-m)?
What must be the turns ratio of a star-delta transformer to be connected with a 11 kV/33 kV delta-star transformer in parallel?
A synchronous motor operates at full load such that the synchronous reactance drop (IaXs) is equal to the terminal voltage per phase. If the (IaXs) drop is 30% less than the induced EMF, calculate the motor's power factor?
An alternator is connected to an infinite bus-bar and delivers rated power at 0.8 lag pf. To improve the power factor to unity, which of the following procedures will be used?
The starting current and torque of a 500 V DC shunt motor is 400 A, 500 N-m respectively. What would be the torque at a full-load speed of 300 rad/sec?
The speed of a 3-phase, SCIM, 50 Hz induction motor is 750 rpm at no-load. It's speed with full-load torque is 95% of no-load value. What would be the new speed of stator poles being changed to 6 by keeping the load torque constant?
A 100/200 V, 10 kVA transformer has a maximum regulation of 10% at full-load. This transformer offers zero regulation at 0.8 lead power factor. What would be the full-load copper loss of this transformer?
A 10 pole alternator has 120 slots in stator. Each coil has a span of 9 slots. The value of pitch factor is __
The no-load current drawn by a 11 kV, 50 Hz transformer is (1-j5) A. If the supply voltage changes to 75 Hz, the magnetizing reactance (in k-ohm) would be _
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A 500 V DC shunt motor has a starting current of 250 A and full load current of 50 A. The mechanical power developed at full-load will be _. Neglect the rotational losses.
If the load connected on a 3-phase, 4-pole, 50 Hz induction motor is equal to it's breakdown capacity, then the operating slip will be ___. Consider the standstill rotor impedance as (1+j5) ohm/phase.
The operating slip of a 3-phase, 400 V, Y-connected, 50 Hz, 2-pole induction motor is 0.06 and it's rotor voltage per phase at this slip is 10 V. What would be the turns ratio of this motor?
The magnetizing reactance of a transformer is independent of ____
The short circuit test details of a 1000V, 20 kVA transformer is 50V, rated current, 600 W. What would be the % voltage regulation at full-load, ZPF leading power factor?
