The frequency of e.m.f generated by a generator depends upon its

The form factor for half wave rectified sine wave is :

Heat from the filament of a lamp is transmitted to the surrounding mainly through

Which of the following devices cannot convey from d.c. to a.c. ?

A material commonly used for shielding or screening magnetism is :

As the voltage of transmission increases, the volume of conductor :

Application of Nortion's theorem to a circuit yields :

Flemings left hand rule is applicable to :

Electric potential is a

The colour of sodium lamp is :

Skewing of rotor slots helps in

Transformer-core laminations are made of :

Ohm's law (E = IR)

The core flux in a transformer depends mainly on

Transient disturbances are due to :

Circular coil sections are used because they :

Load shading is done :

1 Tesla is the same as one

The synchronous motors are not self-starting because

The rotor of the salient pole alternator has 24 poles. The number of cycles of emf in one revolution would be :

Transient currents in electrical circuits are associated with

Mutual inductance between two coils can be decreased by :

An electric field can deflect

In a d.c. machine, armature emf is

In performing the short circuit test of a transformer

Which of the following materials has the highest permeability ?

One lux is same as

In which method of starting a motor, the starting current is maximum ?

In which of the following motors, the slater and rotor magnetic fields rotate at the same speed :

The advantage of salient poles in an alternator is

The power factor in a transformer

The method of heating used for non conducting material is

In induction heating, which of the following is of high value ?

Transportation method is

When the relative permeability of a material is slightly less than 1, it is called a

In quality system, which is the model for quality assurance in design production, installation and servicing ?

For repetitive type projects, the mostly used network technique is

In a ACSR conductors, steel wire is used for

Economiser in a boiler is used to :

The pole and pole shoes of a synchronous machine are laminated in order to reduce :

Oil in transformer is used as :

In the measurement of 3 phase power by 2 wattmeter method if 2 wattmeter readings are equal, the power factor of the circuit is :

In a delta connected circuit, the relationship between line and phase voltage of a delta connected circuit is given by

For moving iron instruments, which statement below is not correct ?

The increase in resistance due to non uniform distribution of current in a conductor is known as :

Class 11 insulation is normally used in :

The type of d.c. generator used for arc welding purposes is

The major disadvantage, with solar cells for power generation is :

Distribution transformers are usually designed to have maximum efficiency

Select the wrong statement from below, which is the essential condition for parallel operation of two or more transformers.