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Electric Circuits MCQs | Electric Circuits Multiple Choice Questions(MCQs) & Answers

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Questions
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

Answer: 2 Watts
2 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

Answer: 2 Joules
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3 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

Answer: L1 + L2 - 2M
4 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

Answer: 714 micro-farad
5 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

Answer: A galvanometer with low resistance in series is an ammeter
6 A passive network
A Has no current source
B Has no e.m.f. source
C Has neither of the above
D Has either of the above

Answer: Has no e.m.f. source
7 In the circuit given below, the ammeter reads 0.1 ampere and voltmeter 10 volts. The internal resistance of the ammeter is 1 ohm and that of voltmeter is 500 ohms. What is the value of R?
A 110 ohms
B 120 ohms
C 115 ohms
D 125 ohms

Answer: 125 ohms
8 Mass in the MKS unit system is analogous to
A Resistance
B Voltage
C Inductance
D Capacitance

Answer: Capacitance
9 A damped oscillation has the equation I = 50 e-10tsin 628 t. What will be the frequency of a oscillation?
A 50 Hz
B 75 Hz
C 100 Hz
D 60 Hz

Answer: 100 Hz
10 A 0.5 meter long conductor carrying a current of 2 amperes is placed in a magnetic field having the flux density of 0.05 wb/m2. What will be the amount of force experienced by the conductor?
A 1 New
B 2 New
C 0.05 New
D 0.5 New

Answer: 0.05 New
11 If a coil has a resistance of 10 ohms and an inductance of 1 H, what will be the value of current 0.1 second after switching on a 500 V d.c. supply?
A 6.32 A
B 3.16 A
C 3.7 A
D 4.0 A

Answer: 3.16 A
12 An electrical circuit is shown below, what will be the power dissipation in the circuit assuming P as power across R2 ?
A 3/4 P
B 2/3 P
C 4/3 P
D 3/2 P

Answer: 4/3 P
13 If two resistances connected in parallel and each dissipates 10 watts the total power supplied by the voltage source equals
A 5 watts
B 10 watts
C 20 watts
D 100 watts

Answer: 20 watts
14 If a parallel circuit is open in the main line, the current
A Increases in each branch
B Is zero in all branches
C Is zero in the highest resistive branch
D Increases in the branch of the lowest resistance

Answer: Is zero in all branches
15 In which of the following circuits most current will be produced by the voltage source?
A 5 volts across a 5 ohm resistance
B 5 volts across two 5 ohm resistance in series
C 5 volts across two 5 ohm resistance in parallel
D 500 volts across a 1 M Ω resistance

Answer: 5 volts across two 5 ohm resistance in parallel
16 If a wire conductor of 0.1 ohm resistance is doubled in length, its resistance becomes
A 0.1 ohm
B 0.02 ohm
C 0.2 ohm
D 0.05 ohm

Answer: 0.2 ohm
17 The square waveform of current has following relation between r.m.s. value and average value
A R.M.S. value of current is greater than the average value
B R.M.S. value of current is less than the average value
C R.M.S. value of the current is to average value
D There is no meaning of r.m.s value and average value for square wave

Answer: R.M.S. value of the current is to average value
18 The transient currents are associated with the
A Applied voltage to the circuit
B Changes in the stored energy in the inductors and capacitors
C Resistance of the circuit
D Impedance of the circuit

Answer: Changes in the stored energy in the inductors and capacitors
19 A closed switch has a resistance of
A Infinity
B Zero
C About 500 ohms
D None Of The Above

Answer: Zero
20 Two 500 ohms, 1 watt resistors are connected in parallel. Their combined resistance and wattage rating will be
A 5000 ohms, 1 watt
B 250 ohms, 2 watts
C 1000 ohms, 2 watts
D 500 ohms, 2 watts

Answer: 250 ohms, 2 watts
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