Cylindrical winding on transformers is generally used beyond

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 :

The synchronous motors are not self-starting because

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

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 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 :

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.

Which test can be used to determine the no load losses of a shunt motor ?

The speed of a d.c. motor is

Damper windings are provided in synchronous machines to

The form factor of d.c. supply voltage is always