R4RIN – MCQs, Mock Tests | Electrical engineering Network Theory Set-3

The Superposition Theorem is not applicable for _________

1. Power calculation
2. Voltage calculation
3. Current Calculation
4. Both Voltage and Current calculation

✅ Correct Answer: 1

In superposition theorem when we consider one voltage source, all the other voltage sources are ___________

1. Shorted
2. Removed
3. Undisturbed
4. Opened

✅ Correct Answer: 1

In Reciprocity Theorem, which of the following ratios is considered?

1. Voltage to current
2. Current to current
3. Voltage to voltage
4. No ratio is considered

✅ Correct Answer: 1

The Reciprocity Theorem is valid for ___________

1. Non-Linear Time Invariant circuits
2. Linear Time Invariant circuits
3. Non-Linear Time Variant circuits
4. Linear Time Variant circuits

✅ Correct Answer: 2

The Reciprocity Theorem is applicable for __________

1. Single-source networks
2. Multi-source networks
3. Both Single and Multi-source networks
4. Neither Single nor Multi-source networks

✅ Correct Answer: 1

The temperature coefficient of a metal as the temperature increases will ____________

1. Decreases
2. Increases
3. Remains unchanged
4. Increases and remains same

✅ Correct Answer: 1

Given a wire of resistance R Ω. The resistance of a wire of the same material and same weight and double the diameter is ___________

1. 0.5 R
2. 0.25 R
3. 0.125 R
4. 0.0625 R

✅ Correct Answer: 4

The star equivalent resistance of 3 resistors having each resistance = 5 Ω is ____________

1. 1.5 Ω
2. 1.67 Ω
3. 3 Ω
4. 4.5 Ω

✅ Correct Answer: 2

The charge associated with a bulb rated as 20 W, 200 V and used for 10 minutes is ____________

1. 36 C
2. 60 C
3. 72 C
4. 50 C

✅ Correct Answer: 2

For a series RL circuit having L = 5 H, current = 1 A (at an instant). The energy stored in magnetic field is ___________

1. 3.6 J
2. 2.5 J
3. 1.5 J
4. 3 J

✅ Correct Answer: 2

For a practical voltage source, which of the following is correct?

1. Cannot be less than source voltage
2. Cannot be higher than source voltage
3. Is always less than source voltage
4. Is always equal to source voltage

✅ Correct Answer: 2

Consider an electric motor having resistance of 10 Ω, 20 Ω and 30 Ω respectively. The percentage of energy dissipated by 10 Ω earthing plate is ____________

1. More than 50% of total energy
2. Less than 50% of total energy
3. Depends on the materials of the three plates
4. May be more or less than 50% of total energy

✅ Correct Answer: 1

Consider a resistive network circuit, having 3 sources of 18 W, 50 W and 98 W respectively and a resistance R. When all source act together the maximum and minimum power is ____________

1. 98 W, 18 W
2. 166 W, 18 W
3. 450 W, 2 W
4. 166 W, 2 W

✅ Correct Answer: 3

A current waveform is of the shape of a right angled triangle with period of t = 1 sec. Given a resistance R = 1 Ω. The average power is __________

1. 1 W
2. 0.5 W
3. 0.333 W
4. 0.111 W

✅ Correct Answer: 4

Given two mutually coupled coils have a total inductance of 1500 mH, the self-inductance of each coils if the coefficient of coupling is 0.2 is ____________

1. 325 mH
2. 255 mH
3. 625 mH
4. 550 mH

✅ Correct Answer: 3

For a series RL circuit, the impedance Z = 10 Ω at a frequency of 50 Hz. At 100 Hz the impedance is ___________

1. 10 Ω
2. 20 Ω
3. 1 Ω
4. More than 1 Ω but less than 10 Ω 0 Ω

✅ Correct Answer: 4

Consider the self-inductances of two coils as 12 H and 5 H. 50 % of one flux links the other. The mutual inductance is ___________

1. 30 H
2. 24 H
3. 9 H
4. 4.5 H

✅ Correct Answer: 4

A network contains linear resistors and ideal voltage source s. If values of all the resistors are doubled, then voltage across each resistor is __________

1. Halved
2. Doubled
3. Increases by 2 times
4. Remains same

✅ Correct Answer: 4

The linear circuit element among the following is ___________

1. Capacitor
2. Inductor
3. Resistor
4. Capacitor & Inductor

✅ Correct Answer: 3

A particular electric current is made up of two component: a 10 A and a sine wave of peak value 14.14 A. The average value of electric current is __________

1. 0
2. 24.14 A
3. 10 A
4. 14.14 A

✅ Correct Answer: 3

Among the following, the active element of electrical circuit is ____________

1. Voltage source
2. Current source
3. Resistance
4. Voltage and current source both

✅ Correct Answer: 3

The basic elements of an electric circuit are _____________

1. R, L and C
2. Voltage
3. Current
4. Voltage as well as current

✅ Correct Answer: 1

The energy stored in the magnetic field at a solenoid 100 cm long and 10 cm diameter wound with 1000 turns of wire carrying an electric current of 10 A, is ___________

1. 1.49 J
2. 0.49 J
3. 0.1 J
4. 1 J

✅ Correct Answer: 2

The two windings of a transformer have an inductor of 2 H each. If mutual inductor between them is also 2 H, then which of the following is correct?

1. Turns ratio of the transformer is also 2
2. Transformer is an ideal transformer
3. It is a perfect transformer
4. It is a perfect as well as an ideal transformer

✅ Correct Answer: 3

The form factor of sinusoidal alternating electric current is ___________

1. 0
2. 1
3. 1.11
4. 1.15

✅ Correct Answer: 3

The rms value of the sine wave is 100 A. Its peak value is ____________

1. 70.7 A
2. 141.4 A
3. 150 A
4. 282.8 A

✅ Correct Answer: 2

Potential of earth is – 50 V. If the potential difference between anode and cathode (earthed) is measured as 150 V, actual voltage on anode is __________

1. 0 V
2. 100 V
3. 200 V
4. 250 V

✅ Correct Answer: 3

An alternating voltage V = 150 sin(314)t is supplied to a device which offers a resistance of 20 Ω in forward direction of electric current while preventing the flow of electric current in reverse direction. The form factor is ___________

1. 0.57
2. 0.318
3. 1.414
4. 1.57

✅ Correct Answer: 4

A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross sectional area of 300 mm2. The inductor of the coil corresponding to a magnetizing electric current of 3 A will be?

1. 37.68 μH
2. 47.68 μH
3. 113.04 μH
4. 120.58 μH

✅ Correct Answer: 3

Impedance is a complex quantity having the real part as _______ and the imaginary part as ______

1. resistance, resistance
2. resistance, reactance
3. reactance, resistance
4. reactance, reactance

✅ Correct Answer: 2

If we apply a sinusoidal input to RL circuit, the current in the circuit is __________ and the voltage across the elements is _______________

1. square, square
2. square, sinusoid
3. sinusoid, square
4. sinusoid, sinusoid

✅ Correct Answer: 4

In purely resistive circuit, energy delivered by source is ____________ by resistance.

1. dissipated in the form of heat
2. stored as electric field
3. stored as magnetic field
4. returned to source

✅ Correct Answer: 1

In inductor, the energy delivered by source is ____________ by inductor.

1. stored as magnetic field
2. dissipated in the form of heat
3. returned to source
4. stored as electric field

✅ Correct Answer: 1

In capacitor, the energy delivered by source is ____________ by capacitor.

1. returned to source
2. dissipated in the form of heat
3. stored as electric field
4. stored as magnetic field

✅ Correct Answer: 3

If there is complex impedance in a circuit, part of energy is ____________ by reactive part and part of its energy is ____________ by the resistance.

1. alternately stored and returned, alternately stored and returned
2. alternately stored and returned, dissipated
3. dissipated, alternately stored and returned
4. dissipated, dissipated

✅ Correct Answer: 2

The time varying part in the equation of instantaneous power has frequency ________________ that of the frequency of voltage or current wave forms.

1. equal to
2. twice
3. thrice
4. four times

✅ Correct Answer: 2

Instantaneous power is negative, when the polarities of voltage and current are of __________

1. opposite sign
2. same sign
3. voltage is zero
4. current is zero

✅ Correct Answer: 1

At θ=π/2, positive portion is __________ negative portion in power cycle.

1. greater than
2. less than
3. equal to
4. greater than or equal to

✅ Correct Answer: 3

If a circuit has complex impedance, the average power is ______

1. power stored in inductor only
2. power stored in capacitor only
3. power dissipated in resistor only
4. power stored in inductor and power dissipated in resistor

✅ Correct Answer: 3

The highest power factor will be?

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 1

In case of resistive load, what is the power factor?

1. 4
2. 3
3. 2
4. 1

✅ Correct Answer: 4

For reactive load, the power factor is equal to?

1. 0
2. 1
3. 2
4. 3

✅ Correct Answer: 1

Average power is also called?

1. apparent power
2. reactive power
3. true power
4. instantaneous power

✅ Correct Answer: 3

If we apply a sinusoidal voltage to a circuit, the product of voltage and current is?

1. true power
2. apparent power
3. average power
4. reactive power

✅ Correct Answer: 2

The power factor=?

1. sinθ
2. cosθ
3. tanθ
4. secθ

✅ Correct Answer: 2

The power factor is the ratio of ________ power to the ______ power.

1. average, apparent
2. apparent, reactive
3. reactive, average
4. apparent, average

✅ Correct Answer: 1

The power factor is called leading power factor in case of ____ circuits.

1. LC
2. RC
3. RL
4. RLC

✅ Correct Answer: 2

The term lagging power factor is used in which circuits?

1. RLC
2. RC
3. RL
4. LC

✅ Correct Answer: 3

Reactive power is expressed in?

1. Watts (W)
2. Volt Amperes Reactive (VAR)
3. Volt Ampere (VA)
4. No units

✅ Correct Answer: 2

If there are M branch currents, then we can write ___________ number of independent equations.

1. M-2
2. M-1
3. M
4. M+1

✅ Correct Answer: 3