Electrical Machines Objective Questions – Set 2

In DC machines internal characteristics are plotted between

In DC machine shape of armature MMF wave is?

The functions of inter poles are

The size of inter pole are small as compared to main poles. What is the reason?

Which of the following generators are used in arc welding?

Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

In DC machines shape of net flux density is?

Compensating winding is placed in the

Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

Series field consists of--------number of turns and ---------- conductors respectively

The effect of ------------------ on main field flux is armature reaction?

In DC machine shape of main field flux distribution is?

Armature flux is.............with respect to main field flux or main field poles?

Demagnetization effects which of the following?

Which of the following is/are the methods to reduce the armature reaction and its effects?

No load saturation characteristics are plotted between

Which of the following is/are the advantages of carbon brush over the copper brush?

Flux density under trailing pole tips in case of generator will

Cross magnetization effects which of the following?

For a dc machine shunt resistance and armature resistance values are

Which of the following statements is/are correct ?

Brushes are always placed on--------------- , in order to achieve sparkles commutation?

Which of the following is/are effects of armature reaction?

Series generators are used in which of the following applications?

In DC machine torque depends on which of the following?

Dummy coils are used for

Flux density under leading pole tips in case of generator will

What is/are the necessary conditions for voltage build up in self excited generator?

Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?