Basic Electrical Engineering Mock Test 7

10%

Question 1 of 10

1. What happens to the inductance as the area of the cross section of the coil increases?

Becomes zero

Remains the same

Increases

Decreases

Question 1 of 10

Question 2 of 10

2. PMMC instruments can be used as a fluxmeters by _______

Removing the control spring

Using a high resistance in series

Making the control springs having a large moment of inertia

Using a low resistance shunt

Question 2 of 10

Question 3 of 10

3. If either the inductance or the rate of change of current is doubled, the induced e.m.f?

Becomes zero

Becomes half

Remains constant

Doubles

Question 3 of 10

Question 4 of 10

4. An RL network is one which consists of ____________

Resistor and inductor in parallel

Resistor and inductor in series

Resistor and capacitor in parallel

Resistor and capacitor in series

Question 4 of 10

Question 5 of 10

5. Calculate the inductance in an inductive circuit whose time constant is 2s and the resistance is 5 ohm.

15H

20H

10H

Question 5 of 10

Question 6 of 10

6. What is the expression for current in the given circuit?

i=2(e^-2t)A

i=2(1+e^-2t)A

i=2(e^2t)A

i=2(1-e^-2t)A

Question 6 of 10

Question 7 of 10

7. What happens to the inductance when the current in the coil becomes double its original value?

Becomes half

Becomes four times

Becomes double

Remains same

Question 7 of 10

Question 8 of 10

8. What is the unit for inductive reactance?

Henry

Ohm

Volts

Farad

Question 8 of 10

Question 9 of 10

9. The discharging time constant of a circuit consisting of an inductor is the time taken for the voltage in the inductor to become __________ % of the initial voltage.

Question 9 of 10

Question 10 of 10

10. Calculate the number of turns in an inductor with a ferromagnetic core when the inductance is 4000 H, the current changes from 5A to 7A and the flux changes from 760 to 800 Wb.

400

300

200

100

Question 10 of 10