Electrical Machines Objective Questions – Set 23

Rotating part of DC motor is known as

With the increase in speed of DC motor

The DC compound motors are generally

The armature shaft must be able to with stand

In a DC compound motor the field regulator is provided to

Which of following winding is connected in series with armature winding of DC machine?

If the flux of DC motor approaches zero, its speed will

The direction of rotation of a DC compound motor can be reversed by interchanging

The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

When the supply terminal of a DC shunt motor are interchanged

A large series motor is never started without some mechanical on it because otherwise it will

If a DC motor is connected across the AC supply it will

Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

Direction of rotation of DC motor is reversed by

If the field winding connection of DC shunt motor is changed

In case of a conductively compensated DC series motor, the compensating winding is provided

An electric motor with constant output power will have a torque speed characteristics in the form of a

The speed of a DC series motor is

The speed regulation of a DC motor is given as

The output indicate on the name plate of any motor is always the

Rotating part of DC motor is known as

The output power of any electrical motor is taken from the

When the mechanical power is developed by a DC motor maximum

If the back emf in DC motor vanishes suddenly the motor will

DC Motor

If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

E_b/V ratio of a DC motor is an indication of

Speed of DC motor can be controlled by varying

The direction of rotation of a DC motor can be determent by