Technical Test SSC JE: Electrical Engineering (EE)- 14 - Electrical Engineering (EE) MCQ

Zero-sequence currents can flow from a line to transformer bank if the windings are in

Resistivity of wire depends on

In a transistor largest dimension is that of –

Which one of the following describes correctly the effect of adding a zero to the system ?

For both lap and wave windings, there are as many commutator bars as the number of

A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies.The frequency of the horizontal input is 1,000 Hz. What is the frequency of the vertical input ?

Negative-sequence reactance of a transformer is
 

Current flow through a bipolar transistor is by means of –

Five resistances are connected as shown in fig.6.

The equivalent resistance between the point A and B will be

The smallest change in a measured variable to which an instrument will respond is

114.Which of the following bridges can be used for inductance measurement ?
1. Maxwell bridge     2. Hay's bridge
3. Wein bridge          4. Wheatstone bridge
Select the correct answer using the code given below:
 

What is the approximate input impedance of a CRO?

Which of the following relation is incorrect ?

power factor =

Dead time of the instrument is

A FET can be used as a variable –

The power of a three-wire balanced system was measured by two wattmeter method. The reading of one of the wattmeter was found to be double that of the other. What is the pf of the system ?

The field coils of a dc generator are usually made of

Torque/weight ratio of an instrument indicates

 ......... is the best electronic device for fast switching.

123. The characteristic equation of a feedback control system is given by :s³ + 6s² + 9s + 4 = 0 is What is the number of roots in the left -half of the s-plane ?

An alternating e.m.f. is applied to a pure inductance such that inductive reactance is 10 W.If the frequency of a.c. is doubled, the reactance will become

A series R-L-C circuit will have unity power factor if operated at a frequency of

The errors introduced by an instrument fall in which category ?

The current drawn by a 120 V dc motor with back emf of 110 V and armature resistance of 0.4W is

If the power factor is below 0.5 in two wattmeter method of power measurement

The positive-negative and zero sequence impedances of a solidly grounded system under steady-state condition always follow the relations

The resistance temperature coefficient is defined as