Technical Test SSC JE: Electrical Engineering (EE)- 4 - Electrical Engineering (EE) MCQ

A magnetic ring has a mean circumference of 20 cm and a cross section of 20 cm² and has 800 numbers of turns of wire. When the exciting current is 5A, the flux is 2 mWb. The relative permeability of iron is nearly

Random error is

A semiconductor device made out of a material having very high temperature coefficient of resistance is

One single-phase energy meter operating on 230 V and 5A for 5 hours makes 1940 revolution. Meter constant is 400 rev/kWh. The power factor of the load is

In a junction transistor, the collector cut-off current 'I_CBO' reduces considerably by doping the

In a D.C. generator all of the following could be the effects of iron losses except

The losses occurring in a D.C. generator are given below which loss is likely to have highest proportion at rated load of the generator

In a D.C. generator the critical resistance can be increased by

A series resonant circuit has an inductive reactance of 1000W, a capacitive reactance of 1000W and a resistance of 0.1W. If resonant frequency is 10 MHz, then the bandwidth of the circuit will be

Consider the network given below

The time constant of the circuit is

Two bulbs marked 200 watt, 250 volts and 100 watt -250 volts are joined in series to 250 volts supply. Power consumed in circuits is

Three equal resistors connected in series across a source of emf together dissipate 10 watts of power. What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf ?

In a transmission system, the weight of copper used is proportional to

If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency will

A piece of silver wire has a resistance of 1W. A manganin wire has specific resistance 30 times that of silver. The resistance of a manganin wire of one fourth length and one third diameter will be

Wattless current is possible, only in

If the stator voltage and frequency of an induction motor are reduced proportionately,its

The efficiency and p.f. of SCIM increases in proportion to its

Which of the following lamp gives nearly monochromatic light ?

A auto transformer used with sodium vapour lamp should have

For supply on 25 kV, 50 Hz single phase, suitable motor for electric traction is

The welding transformer used in resistance welding will

The power factor of the load using welding transformer is usually

The welding load is always

Pump, blowers and fans are usually called for

In lap windings, the equalizer rings are used to save

A transformer is considered to have a network of series capacitance due to