1728 + Mcqs in Electronics McqOptions

1.	What is the resonant frequency in the given circuit?
A.	6.5 kHz
B.	53.7 kHz
C.	107.4 kHz
D.	18.1 MHz
Answer» C. 107.4 kHz

Discussion

2.	What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5 V, and VL = 3.3 V?
A.	45.0 degrees
B.	82.7 degrees
C.	90.0 degrees
D.	172.7 degrees
Answer» C. 90.0 degrees

Discussion

3.	Which statement best describes reactance in a series RLC circuit?
A.	Capacitive reactance is always dominant.
B.	Inductive reactance is always dominant.
C.	Resistance is always dominant.
D.	The larger of the two reactances is dominant.
Answer» E.

Discussion

4.	What is the band pass (F1 F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?
A.	100.0 kHz to 155.0 kHz
B.	147.5 kHz to 152.5 kHz
C.	295.5 kHz to 4500 kHz
D.	149,970 Hz to 150,030 Hz
Answer» C. 295.5 kHz to 4500 kHz

Discussion

5.	What is the total impedance of a 60 Hz series RLC circuit when XL = 7.5 ohms, XC = 265.3 ohms, and R = 33 ohms?
A.	257.8 ohms
B.	259.9 ohms
C.	290.8 ohms
D.	1989.75 ohms
Answer» C. 290.8 ohms

Discussion

6.	A capacitor can be fully charged in 4 time constants.
A.	True
B.	False
Answer» C.

Discussion

7.	Capacitors are often used as filters.
A.	True
B.	False
Answer» B. False

Discussion

8.	Capacitors in parallel have a higher total value than any individual capacitor.
A.	True
B.	False
Answer» B. False

Discussion

9.	A high-pass filter heavily attenuates the higher frequencies.
A.	True
B.	False
Answer» C.

Discussion

10.	The impedance of an RC series circuit is (R2 +C2)1/2.
A.	True
B.	False
Answer» C.

Discussion

11.	A capacitor stores electric energy in the form of an electric field.
A.	True
B.	False
Answer» B. False

Discussion

12.	The frequency response curve for a low-pass filter illustrates that as the frequency of the input increases, the voltage of the output will decrease.
A.	True
B.	False
Answer» B. False

Discussion

13.	The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).
A.	True
B.	False
Answer» B. False

Discussion

14.	The true power in an RC series circuit is PR = I2 x R.
A.	True
B.	False
Answer» B. False

Discussion

15.	This circuit is a low-pass filter.
A.	True
B.	False
Answer» C.

Discussion

16.	This circuit is a high-pass filter.
A.	True
B.	False
Answer» C.

Discussion

17.	By increasing the resistance of a coil you can increase the Q of the coil at resonance.
A.	True
B.	False
Answer» C.

Discussion

18.	In the given circuit, the voltage at point A equals ______.
A.	10 V
B.	+1 V
C.	+9 V
D.	+10 V
Answer» E.

Discussion

19.	In the given circuit, the voltage dropped across R1 equals _____.
A.	1 V
B.	9 V
C.	10 V
D.	19 V
Answer» C. 10 V

Discussion

20.	___ is often used to analyze multiple-source circuits.
A.	Thevenin's theorem
B.	Superposition
C.	Kirchhoff's law
D.	Ohm's law
Answer» C. Kirchhoff's law

Discussion

21.	If a Wheatstone bridge is balanced, its output voltage is ____.
A.	the same as its input voltage
B.	very high
C.	dependent on the unknown resistor value
D.	equal to 0 V
Answer» E.

Discussion

22.	When a load is connected to a voltage divider, the total resistance of the circuit will ________.
A.	increase
B.	decrease
C.	remain the same
D.	double
Answer» C. remain the same

Discussion

23.	The bandwidth of a filter is the range of frequencies between the half-power frequencies.
A.	True
B.	False
Answer» B. False

Discussion

24.	If the output voltage were taken from across the resistor in the given circuit, the circuit would be a band-pass filter.
A.	True
B.	False
Answer» B. False

Discussion

25.	When inductive and capacitive reactance are present in the same series circuit, the magnitude of the total reactance is equal to the sum of the magnitudes of the individual reactances.
A.	True
B.	False
Answer» C.

Discussion

26.	The quality factor at resonance of a series circuit is VR/VL.
A.	True
B.	False
Answer» C.

Discussion

27.	The less selective a filter is, the steeper the slope of its curves at the cutoff frequencies.
A.	True
B.	False
Answer» C.

Discussion

28.	If the given circuit in were operating at resonance, the total current would be maximum.
A.	True
B.	False
Answer» C.

Discussion

29.	If the output voltage were taken across the resistor in the given circuit, the circuit would be a band-stop filter.
A.	True
B.	False
Answer» B. False

Discussion

30.	In a series RLC circuit, at above resonance the circuit is more capacitive than it is inductive.
A.	True
B.	False
Answer» C.

Discussion

31.	The voltage across the inductor is 77.8 volts.
A.	True
B.	False
Answer» C.

Discussion

32.	If the given circuit were at resonance, the total current would be at its maximum.
A.	True
B.	False
Answer» B. False

Discussion

33.	Series LC combinations are used more often in tuned amplifier circuits than are parallel LC combinations.
A.	True
B.	False
Answer» C.

Discussion

34.	The quality factor of a parallel circuit at resonance is VC/VS or VL/VS.
A.	True
B.	False
Answer» B. False

Discussion

35.	The impedance is 160 .
A.	True
B.	False
Answer» C.

Discussion

36.	The greater the selectivity, the wider the bandwidth.
A.	True
B.	False
Answer» C.

Discussion

37.	A parallel tuned circuit can be used to couple energy from one circuit to another.
A.	True
B.	False
Answer» B. False

Discussion

38.	The impedance is 9684 .
A.	True
B.	False
Answer» B. False

Discussion

39.	The diode's characteristic curve shows that current increases when voltage increases.
A.	True
B.	False
Answer» B. False

Discussion

40.	If a bridge rectifier is used, it is not necessary to use a transformer.
A.	True
B.	False
Answer» B. False

Discussion

41.	Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.
A.	True
B.	False
Answer» B. False

Discussion

42.	A common problem with rectifiers is open diodes.
A.	True
B.	False
Answer» B. False

Discussion

43.	The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons.
A.	True
B.	False
Answer» B. False

Discussion

44.	The opposition to ac from a capacitor is called reluctance.
A.	True
B.	False
Answer» C.

Discussion

45.	The greater the distance between the plates of a capacitor, the smaller the capacitance value.
A.	True
B.	False
Answer» B. False

Discussion

46.	An ohmmeter can be used to test a capacitor.
A.	True
B.	False
Answer» B. False

Discussion

47.	This circuit is an RC integrator.
A.	True
B.	False
Answer» C.

Discussion

48.	In the given circuit, the voltage across the capacitor 1 ms after the switch is closed is 11.61 V.
A.	True
B.	False
Answer» C.

Discussion

49.	The loading effect of a voltmeter can be ignored if ____.
A.	the measured voltage is very high
B.	the measured voltage is very low
C.	the meter's resistance is at least 10 times greater than the resistance across which it is connected
D.	the meter's resistance is at least 10 times less than the resistance across which it is connected
Answer» D. the meter's resistance is at least 10 times less than the resistance across which it is connected

Discussion

50.	A Thevenin equivalent circuit contains _____.
A.	a voltage source in series with a resistance
B.	a current source in series with a resistance
C.	resistors in a series-parallel configuration
D.	many voltage sources
Answer» B. a current source in series with a resistance

Discussion

Explore topic-wise MCQs in Testing Subject.

What is the resonant frequency in the given circuit?

What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5 V, and VL = 3.3 V?

Which statement best describes reactance in a series RLC circuit?

What is the band pass (F1 F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?

What is the total impedance of a 60 Hz series RLC circuit when XL = 7.5 ohms, XC = 265.3 ohms, and R = 33 ohms?

A capacitor can be fully charged in 4 time constants.

Capacitors are often used as filters.

Capacitors in parallel have a higher total value than any individual capacitor.

A high-pass filter heavily attenuates the higher frequencies.

The impedance of an RC series circuit is (R2 +C2)1/2.

A capacitor stores electric energy in the form of an electric field.

The frequency response curve for a low-pass filter illustrates that as the frequency of the input increases, the voltage of the output will decrease.

The phase angle of an RC series circuit is = invtan (XC/R) = invtan (VC/VR).

The true power in an RC series circuit is PR = I2 x R.

This circuit is a low-pass filter.

This circuit is a high-pass filter.

By increasing the resistance of a coil you can increase the Q of the coil at resonance.

In the given circuit, the voltage at point A equals ______.

In the given circuit, the voltage dropped across R1 equals _____.

___ is often used to analyze multiple-source circuits.

If a Wheatstone bridge is balanced, its output voltage is ____.

When a load is connected to a voltage divider, the total resistance of the circuit will ________.

The bandwidth of a filter is the range of frequencies between the half-power frequencies.

If the output voltage were taken from across the resistor in the given circuit, the circuit would be a band-pass filter.

When inductive and capacitive reactance are present in the same series circuit, the magnitude of the total reactance is equal to the sum of the magnitudes of the individual reactances.

The quality factor at resonance of a series circuit is VR/VL.

The less selective a filter is, the steeper the slope of its curves at the cutoff frequencies.

If the given circuit in were operating at resonance, the total current would be maximum.

If the output voltage were taken across the resistor in the given circuit, the circuit would be a band-stop filter.

In a series RLC circuit, at above resonance the circuit is more capacitive than it is inductive.

The voltage across the inductor is 77.8 volts.

If the given circuit were at resonance, the total current would be at its maximum.

Series LC combinations are used more often in tuned amplifier circuits than are parallel LC combinations.

The quality factor of a parallel circuit at resonance is VC/VS or VL/VS.

The impedance is 160 .

The greater the selectivity, the wider the bandwidth.

A parallel tuned circuit can be used to couple energy from one circuit to another.

The impedance is 9684 .

The diode's characteristic curve shows that current increases when voltage increases.

If a bridge rectifier is used, it is not necessary to use a transformer.

Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.

A common problem with rectifiers is open diodes.

The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 1018 electrons.

The opposition to ac from a capacitor is called reluctance.

The greater the distance between the plates of a capacitor, the smaller the capacitance value.

An ohmmeter can be used to test a capacitor.

This circuit is an RC integrator.

In the given circuit, the voltage across the capacitor 1 ms after the switch is closed is 11.61 V.

The loading effect of a voltmeter can be ignored if ____.

A Thevenin equivalent circuit contains _____.