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A 600 V DC shunt motor draws 50 A during maximum power condition. Calculate the armature resistance of this motor?
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At the starting stage of a cylindrical rotor synchronous motor, the rotor field winding is usually _
The excitation emf of a synchronous motor is 1.5 PU when it is connected to an infinite bus-bar. The operating power factor of the motor is ZPF lagging. What is the value of power angle of this motor? (Neglect all losses).
The 3-phase Induction motor has a rotor emf/ph of 30 V and current of 60 A at a slip of 10%. It's rotor copper loss at this speed is 4320 W. Calculate the starting current of the rotor circuit?
The Synchronous reactance of an alternator is dependent on which of the following.
1) field excitation
2) air-gap length 3) number of turns in armature winding The correct answer is
The no-load current through the tertiary delta connection of a star-star-denta, 1:1:1 ratio transformer is 5 amp. Now, a balanced 3-ph load of 10 amp, UPF is connected on the secondary star side. What would be the delta winding current?
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?
