# Electrical Engineering MCQ Test Preparation

Electrical Engineering MCQ Test Preparation

In a network made up of linear resistors and ideal voltage source values of resistors are doubled. Then the voltage across each resistor is

 A. doubledB. halved C. decreased four times D. not changed

When a resistor R is connected to a current source, it consumes a power of 18 W. When the same R is connected to a voltage source having the same magnitude as the current source, the power absorbed by R is 4.5 W. The magnitude of the current source and the value of R are

 A. √18A and 1 ΩB. 1A and 18 Ω C. 3A and 2 Ω D. 6A and 0.5 Ω

Kirchhoff’s laws are valid for

 A. linear circuit onlyB. passive time invariant circuits C. non-linear circuits only D. both linear and non-linear circuits

Superposition theorem is not applicable for

 A. voltage calculationB. bilateral elements C. power calculations D. passive elements

Which of the following theorem is applicable for both linear and non-linear circuits ?

 A. Superposition theoremB. Norton theorem C. Thevenin theorem D. None of these

Two wires A and B of same material and length l and 2l have radius r and 2r respectively. The ratio of their specific resistance will be

 A. 1 : 4B. 1 : 2C. 1 : 1 D. 1 : 8

The electrical conductivity of metal is typically of the order of (in ohm − 1m − 1)

 A. 107B. 105C. 10 − 4 D. 10 − 6

Pure metal generally have

 A. high conductivity and low temperature coefficientB. high conductivity and large temperature coefficientC. low conductivity and zero temperature coefficient D. low conductivity and high temperature coefficient

If the length of a wire of resistance R is uniformly stretched n times its original value, its new resistance is

 A. n.RB. n2.RC. R/n D. R/n2

A wire of length l and of circular cross – section of radius r has a resistance of R ohms. Another wire of same material and of x-section radius 2r will have the same R if the length is

 A. 2lB. l/2C. l2 D. 4l

Ohm’s law in point from in field theory can be expressed as

 A. J = σ.EB. V = IRC. J = E/σ D. R = Ρ(l/A)

The insulation resistance of a cable of 10 km is 1 MΩ. For a length of 100 km of the same cable, the insulation resistance will be

 A. 1 MΩB. 0.1 MΩC. 10 MΩ D. 0.01 MΩ

The temperature coefficient of resistance of an insulator is

 A. positive and independent of temperatureB. negative and dependent on temperatureC. negative and independent on temperature D. positive and dependent on temperature

## Electrical Engineering MCQ Test Preparation

PUBLIC SERVICE COMMISSION & OTHER TESTS INFORMATION IN PAKISTAN © 2016