DMRC Electrical Engineering Paper-1 2014

Remain constant.

First decrease and then increase

Increase continuously.

First increase and then decrease.

Both the starting current and torque reduce

Both the starting current and torque increase

The starting current reduces but starting torque increases

The staring current reduces but starting torque remains same.

A capacitor across the mains

A capacitor in series with the machine

A capacitor in series with the auxiliary winding

Equal value capacitors in series with the main and the auxiliary windings

Better speed regulation

Less loss in external resistance

Simplicity in control circuit

Reduced cost of controller

More than full load copper losses

Equal to full load copper losses

Less than full load copper losses

Negligible compared to full load copper losses

Improve heat dissipation

Reduce corona loss

Reduce skin effect

Reduce the line inductance

Higher than emitter region

Lower than base region

Is higher base region but lower than emitter region

Independent of the doping of base and emitter regions.

200 Ω

400 Ω

600 Ω

1600 Ω

Control the output

Provide impedance matching

Provide DC isolation between amplifier and load

Increase the bandwidth

Paper capacitor

Electrolytic capacitor

Ceramic capacitor

Any type of capacitor