Technical Test SSC JE: Electrical Engineering (EE)- 13 - Electrical Engineering (EE) MCQ

If a sinusoidal voltage source is connected to a power transformer, its no load current would be

Short-circuit test is performed on a transformer with a certain impressed voltage at rated frequency. If the short-circuit test is now performed with the same magnitude of impressed voltage but at a frequency higher than the rated frequency, then

If a 230 V DC series motor is connected to a 230 V AC supply, then the motor will

A pair of similar DC shunt generators operate in parallel and supply a common load. It is
required to switch-off machine 1 and allow machine 2 to supply the entire load. The
following operations are to be used to achieve this
1. Switch-off the main switch of machine 1.
2. Reduce the field current of machine 1.
3. Increase the field current of machine 2.
4. Ensure that machine 1 just floats.
The correct sequence of these operations is

Match List-I with List-II and select the correct answer using the codes given below the lists.

As compared to DOL starting, a cage induction motor with star-delta starting shall have

The speed of a 3-phase induction motor operating in its stable region

Match List-I (power factor) with List-II (armature reaction of an alternator) and select
the correct answer using the codes given below the lists

While a 2-pole AC servomotor is in operation, if the voltage across the control field winding becomes zero, then the motor has a tendency to run as a single-phase induction motor. To prevent this

Which of the following single-phase motor has highest starting torque

If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

On which one of the following cycles does a modern steam plant work

The most appropriate operating speeds in rpm of generator used in thermal, nuclear and hydropower plants would be

In the network as shown in figure the marked parameters are per unit impedances. The busadmittance matrix of the network is

The Buchholz relay protects a transformer from

If the fault current is 3000 A for a relay with a plug setting of 50% and CT ratio of 1000 : 1,the plug setting multiplier would be

Maloperation of differential protection of transformers due to magnetizing in rush current is prevented by

In twBo wattmeter method of measuring 3-phase power, power factor is 0.5, then one of the wattmeter will read

Schering bridge is used to

Following figures show four bridges. Which figure is Owen's bridge

The power in a resistor R is estimated measuring the voltage and current using voltmeter-ammeter method. Two different arrangements can be used as shown in circuit I and II. Less erroneous results are obtained adapting

A CRO uses

The latching current of SCR is 18 mA. Its holding current will be

The maximum  in a SCR is

In the figure below the, current of 1A flows through the resistance of

Find the value of Vx in the given figure

Which of the following is correct regarding autotransformer