Explore topic-wise MCQs in Electronics.

This section includes 83 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.

51.

As frequency decreases in a parallel RL circuit the impedance also decreases.

A. 1
B.
Answer» B.
Discussion
52.

The given circuit is a _______.

A. low-pass filter
B. high-pass filter
C. band-pass filter
D. band-stop filter
Answer» B. high-pass filter
Discussion
53.

In a series RL circuit, a power factor of 0.5 results in less energy conversion to heat than does a power factor of 0.6.

A. 1
B.
Answer» B.
Discussion
54.

If the frequency decreases in the given circuit, then _____.

A. IT decreases
B. IR increases
C. IL increases
D. none of the currents will change
Answer» D. none of the currents will change
Discussion
55.

The current lags the source voltage in a series RL circuit.

A. 1
B.
Answer» B.
Discussion
56.

If a 7.5 k resistance is connected to a 10 k inductive reactance in a series RL circuit, then the impedance equals 12.5 k .

A. 1
B.
Answer» B.
Discussion
57.

In the circuit given is, _____.

A. VR leads VL
B. VR lags VL
C. VR is in phase with VL
D. VR, VL, and VS are all in phase
Answer» B. VR lags VL
Discussion
58.

Which of the following statements is true if R1 opens in the circuit in the given circuit?

A. IL2 increases.
B. ZT decreases.
C. VS increases.
D. VL1 equals 0 V.
Answer» E.
Discussion
59.

Phase angle is the difference in phase between the applied voltage (VS) and the circuit current (IT).

A. 1
B.
C. 1
D.
Answer» B.
Discussion
60.

Which of the following statements is true if the frequency decreases in the circuit in the given circuit?

A. The phase angle decreases.
B. VR decreases.
C. IT decreases.
D. VS decreases.
Answer» B. VR decreases.
Discussion
61.

If VS increases in the given circuit, then the _____.

A. impedance increases
B. real power decreases
C. phase angle increases
D. current increases
Answer» E.
Discussion
62.

What is the magnitude of the phase angle between the source voltage and current when a 100 mH inductor with an inductive reactance of 6 k and a 1 k resistor are in series with a source?

A. 0.1°
B. 9.0°
C. 61.0°
D. 81.0°
Answer» E.
Discussion
63.

The voltage dropped across the resistor in the circuit in the given circuit is approximately equal to ___.

A. 5 V
B. 10 V
C. 7.98 V
D. 6.02 V
Answer» D. 6.02 V
Discussion
64.

The phase angle in the circuit in the given circuit is approximately equal to ______.

A. 53°
B. 90°
C. 37°
D. 0°
Answer» D. 0¬∞
Discussion
65.

What is the magnitude of the phase angle of a 24 Vac parallel RL circuit when R = 45 and XL = 1100 ?

A. 0.001°
B. 2.3°
C. 87.6°
D. 89.9°
Answer» C. 87.6¬∞
Discussion
66.

The frequency at which XL = R in an RL circuit is called the _______________.

A. cutoff frequency
B. optimum frequency
C. bandwidth characteristic
D. resonant frequency
Answer» B. optimum frequency
Discussion
67.

The impedance of a series circuit when R = 15 k and XL = 10 k is approximately equal to ________.

A. 5 k
B. 6 k
C. 18 k
D. 25 k
Answer» D. 25 k
Discussion
68.

In the given circuit, IT equals _____.

A. 0.5 A
B. 0.083333333333333
C. 1.5 A
D. 2.5 A
Answer» E.
Discussion
69.

The phase angle will increase in a parallel RL circuit if the resistance is increased.

A. 1
B.
Answer» B.
Discussion
70.

Which of the following statements is true about a lag network?

A. An increase in frequency causes an increase in phase lag.
B. An increase in frequency causes an increase in the magnitude of the output voltage.
C. A decrease in frequency causes an increase in phase lag.
D. A decrease in frequency causes a decrease in the magnitude of the output voltage.
Answer» B. An increase in frequency causes an increase in the magnitude of the output voltage.
Discussion
71.

The circuit in the given circuit is a low-pass filter.

A. 1
B.
Answer» B.
Discussion
72.

The phase angle will decrease in a series RL circuit if the inductance is increased.

A. 1
B.
C. 1
D.
Answer» C. 1
Discussion
73.

For series ac circuits containing both resistance and inductive reactance, total opposition to current can be found by simply adding ohmic values or oppositions to current.

A. 1
B.
Answer» C.
Discussion
74.

The impedance of the circuit in the given circuit is 110 .

A. 1
B.
Answer» C.
Discussion
75.

Which of the following statements is true if R = 100 and XL = 100 in the circuit in the given circuit?

A. Each component drops 5 V.
B. The impedance equals 200 .
C. The power factor equals 1.
D. The phase angle equals 45°.
Answer» E.
Discussion
76.

If XL= 100 and R = 100 , then impedance will be

A. 141.4
B. 14.14
C. 100
D. 200
Answer» B. 14.14
Discussion
77.

As the frequency increases in a series RL circuit the impedance also increases.

A. 1
B.
C. 1
D.
Answer» B.
Discussion
78.

Calculate the voltage dropped across R1 in the given circuit.

A. 14 V
B. 26.8 V
C. 28 V
D. 0 V
Answer» C. 28 V
Discussion
79.

Calculate the voltage dropped across L2 in the given circuit.

A. 18 V
B. 6 V
C. 13.5 V
D. 0 V
Answer» C. 13.5 V
Discussion
80.

What is the true power of a 24 Vac parallel RL circuit when R = 45 and XL = 1100 ?

A. 313.45 W
B. 12.8 W
C. 44.96 W
D. 22.3 W
Answer» C. 44.96 W
Discussion
81.

Which of the following statements is true if the inductor shorts out in the circuit in the given circuit?

A. Each component drops 5 V.
B. The impedance equals 0 .
C. The power factor equals 1.
D. The phase angle equals 90°.
Answer» D. The phase angle equals 90¬∞.
Discussion
82.

If the resistance is larger than the inductive reactance in the given circuit, the phase angle is _______.

A. less than 0°
B. between 0° and 45°
C. between 45° and 0°
D. greater than 90°
Answer» C. between 45¬∞ and 0¬∞
Discussion
83.

As frequency increases

A. both series and parallel RL impedance decrease
B. series RL impedance decreases and parallel RL impedance increases
C. series RL impedance increases and parallel RL impedance decreases
D. both series and parallel RL impedance increase
Answer» E.
Discussion