Energy Conversion

In a lap winding, the number of brushes required is equal to

What is the approximate efficiency of a large transformer?

In a wave winding, the commutator pitch is approximately equal to

A triplex wave winding will have _____ parallel paths.

For a given dc generator, the generated voltage depends upon

For the same rating, a dc machine has _____ an ac machine.

Difference between the speeds of a rotating magnetic field and the associated rotor.

The field winding of a dc shunt machine usually carries _____ of the rated current of the machine.

A separately excited dc generator is not used because

The effect of armature reaction is to

In a dc generator, armature reaction _____ pole tip

The greatest percentage of heat loss in a dc machine is due to

The size of a dc generator can be reduced by using

A secondary cell whose active positive plate consists of nickel hydroxide, and active negative-plate material is powdered iron mixed with cadmium. Its typical output when fully charged is Vo = 1.2V

If a cell can be charged after it is depleted, it is considered as

A battery means

In a dry cell, what will happen to the internal resistance as it aged?

The maximum current a cell can deliver through a 0.01 ohm load during testing

In batteries, the material used to insulate the positive plates from negative plates are technically called

How long will a battery need to operate a 240 Watts equipment, whose capacity is 100Ah and 24 volts rating?