Electrical Machines Objective Questions – Set 23

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

The speed regulation of a DC motor is given as

With the increase in speed of DC motor

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

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?

When the supply terminal of a DC shunt motor are interchanged

In a DC compound motor the field regulator is provided to

Direction of rotation of DC motor is reversed by

Rotating part of DC motor is known as

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

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

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

When the mechanical power is developed by a DC motor maximum

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

The speed of a DC series motor is

Speed of DC motor can be controlled by varying

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

The armature shaft must be able to with stand

The DC compound motors are generally

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

The output power of any electrical motor is taken from the

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

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

If the field winding connection of DC shunt motor is changed

DC Motor

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

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

Rotating part of DC motor is known as

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

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