UP polytechnic Lecturer (EE) Quiz 6

What is the ratio of No-load speed to full load speed of a 200 kVA, 12 pole, 220V, 3 phase, 60 Hz synchronous motor?

A three-phase synchronous motor draws 200 A from the line at power factor at rated load. Considering the same line voltage and load, the line current at a power factor of 0.5 leading is

What is the maximum speed of 60 Hz alternator?

A 20 turn iron-cored inductor is connected to 100V, 50Hz source. The maximum flux density of core is 1Wb/m². The cross sectional area of core is ____.

A synchronous motor is operated from a bus voltage of 1.0 pu and is drawing 1.0 pu zero power factor leading current. Its synchronous reactance is 0.5 pu What is the excitation emf of the motor?

The operating region when a 3-phase induction motor is run at speed more than synchronous speed in the same direction.

The supply voltage to a 3-phase induction motor is reduced by 10 percent. By what percentage will the maximum torque decrease?

As the load on a synchronous motor is increased, the torque angle:-

At s = 0, the torque of an induction motor is:-

The stator of a three-phase, 4-pole alternator accommodates a single-layer three-phase winding in 36 slots. If the coil span of the winding is 120 electrical degrees, then the distribution factor is: