UP polytechnic Lecturer (EE) Quiz 41 for AE & JE Exams Exams

Question 1

In wein’s bridge the formula for frequency f is

Question 2

Match List-I with List-II

Question 3

A polarized relay is

Question 4

In a balanced 3-phase 200 V circuit, the line current is 115.5 A. When the power is measured by two wattmeter method, one of the wattmeters reads 20 kW and the other one reads zero. What is the power factor of the load?

Question 5

The charging reactance of 50 km length of the line is 1500 Ω. What will be the charging reactance for 100 km length of the line?

Question 6

An overcurrent relay having a current setting of 125% connected to a supply circuit through a current transformer of ratio 500/1. The pick up value is

Question 7

A moving-coil voltmeter has a resistance of 80 Ω. The scale is divided into 120 equal divisions. When a potential difference of 0.8 V is applied to the terminals of the voltmeter a deflection of 80 divisions is obtained. Explain how the instrument could be used for measuring up to 220 V.

Question 8

Which of the statement given below is/are correct?

(a) BJT is a current controlled device with high input impedance and high gain bandwidth.

(b) UJT is a positive resistance device and used as oscillator.

(c) FET is a voltage-controlled device with high input impedance and gain bandwidth.

(d) BJT, FET, UJT can all be used for amplification

Question 9

Hysteresis motor can be used in which of the following ?

Question 10

A dc generator running at 750 rpm generates an emf of 220V. The percentage increase in the flux per pole to generate 250V at 700 rpm would be