Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields

1. A 2 ohms resistor having 1 ampere current will dissipate the power of

a) 2 Watts
b) 2 Joules
c) 1 Watt
d) 1 Joule

Ans: (a)

2. When 2 volts e.m.f. is applied across a 1 farad capacitor, it will store the energy of

a) 2 Joules
b) 2 Watts
c) 4 Joules
d) 1 Watt

Ans: (a)

3. Thevenin’s equivalent circuit can be used to calculate the power loss in the original circuit.

a) True
b) False

Ans: (a)

4. A 1 H inductance carrying the current of amperes will store the energy of

a) 2 Watts
b) 2 Joules
c) 4 Watts
d) 4 Joules

Ans: (b)

5. An electrical circuit with 10 branches and 7 junctions will have

a) 10 loop equations
b) 4 loop equations
c) 3 loop equations
d) 7 loop equations

Ans: (b)

6. An electrical circuit with 8 independent nodes will have

a) 10 node equations
b) 4 node equations
c) 3 node equations
d) 7 node equations

Ans: (d)

7. If two winding having self-inductances L1 and L2, and a mutual inductance m are connected in series will opposite, then the total inductance of series combination will be

a) L1 + L2 - 2M
b) L1 + L2 + 2M
c) L1 - L2 + 2M
d) L1 + L2 – M

Ans: (a)

8. The parallel circuit resonance magnifies

a) Current
b) Voltage
c) Power
d) None of the above

Ans: (b)

9. The power factor at resonance in R-L-C parallel circuit is

a) 0.5 lagging
b) 0.5 leading
c) Unity
d) Zero

Ans: (c)

10.An inductive circuit resistance 2 ohms and inductance 0.5 H is connected to a 250 volts, 50 Hz supply. What capacitance will be placed in parallel to produce resonance?

a) 700 micro-farad
b) 750 micro-farad
c) 701 micro-farad
d) 714 micro-farad
e) 711 micro-farad

Ans: (d)

11. The current in resonance in parallel L-C circuit will be

a) Very small
b) Very high
c) Zero
d) Infinity

Ans: (a)

12. Which of the following statement is true?

a) A galvanometer with low resistance in series is an ammeter
b) A galvanometer with high resistance in series is an ammeter

c) A galvanometer with high resistance in parallel is a voltmeter

d) A galvanometer with low resistance in parallel is a voltmeter

Ans: (a)

13. The time constant of the capacitance circuit defined as the time during which voltage

a) Rises to 63.2% of its final steady value
b) Rises to 38.6% of its final steady value
c) Falls to 36.8% of its final steady value
d) None of the above

Ans: (a)

14. Which of the following equation is Poisson’s equation?

a) d2V/dx2 + d2V/dy2 + d2V/dz2 = 0
b) d2V/dx2 = - p/ε0
c) d2V/dx2 + d2V/dy2 = 0
d) d2V/dx2 + d2V/dy2 = p/ε0

Ans: (b)

15. The circuit whose properties are same in either direction is known as

a) Reversible circuit
b) Irreversible circuit
c) Unilateral
d) Bilateral circuit

Ans: (d)