silicon and germanium, but not gallium.

A switching regulator that is configured as a voltage-inverter produces what type of output?

an output that is a higher voltage than the input voltage

an ac output with opposite phase to the input ac

a dc output that is the negative of the dc input voltage

an output that is a higher voltage than the input voltage

an ac output from a dc input voltage

Refer to the given figure. This circuit is called

a series-pass voltage regulator.

a step-down switching regulator.

In Figure 17-1(a)(see question 6), the purpose of R1 is to

limit current through the diode.

provide output voltage sampling.

What is the purpose of an additional RC filter section in a power supply circuit?

Increase the dc voltage component

Increase the ac voltage component

Decrease the ac voltage component

Refer to the given figure. This circuit is known as

a series-pass voltage regulator.

a step-down switching regulator.

Clipping is the result of

the input signal being too large.

the transistor being driven into saturation.

the transistor being driven into cutoff.

The Schottky diode is used

in circuits requiring negative resistance.

in very fast-switching circuits.

What is (are) common fault(s) in a BJT-based circuit?

opens or shorts internal to the transistor

external opens and shorts on the circuit board

Which of the following describe(s) a power amplifier?

It does not provide much voltage gain.

Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

It needs two separate voltage sources.

There is crossover distortion in the output signal.

It does not provide exact switching of one transistor off and the other on at the zero-voltage condition.

For BJT power transistors, the collector terminal is always connected to the transistor's case

because the collector terminal is located nearest the case.

because the collector terminal is the critical terminal for heat dissipation.

because the collector terminal is located nearest the case.

1475 + Mcqs in Electronic Devices Page 8 McqOptions

351.	Refer to this figure. Find the tunnel diode symbol.
A.	a
B.	b
C.	c
D.	d
E.	e
Answer» E. e

Discussion

352.	Refer to this figure. If the load current increases, I_R will ________ and I_Z will ________.
A.	remain the same, increase
B.	decrease, remain the same
C.	increase, remain the same
D.	remain the same, decrease
Answer» E.

Discussion

353.	LEDs are made out of
A.	silicon.
B.	germanium.
C.	gallium.
D.	silicon and germanium, but not gallium.
Answer» D. silicon and germanium, but not gallium.

Discussion

354.	The normal operating region for a zener diode is the
A.	forward-bias region.
B.	reverse-bias region.
C.	zero-crossing region.
D.	reverse-breakdown region.
Answer» E.

Discussion

355.	Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R₁ need to have?
A.	2.25 W
B.	5 W
C.	10 W
D.	22.5 W
Answer» E.

Discussion

356.	A switching regulator that is configured as a voltage-inverter produces what type of output?
A.	an ac output with opposite phase to the input ac
B.	a dc output that is the negative of the dc input voltage
C.	an output that is a higher voltage than the input voltage
D.	an ac output from a dc input voltage
Answer» C. an output that is a higher voltage than the input voltage

Discussion

357.	Refer to the given figure. This circuit is called
A.	a series-pass voltage regulator.
B.	a shunt voltage regulator.
C.	a step-up switching regulator.
D.	a step-down switching regulator.
Answer» E.

Discussion

358.	In Figure 17-1(a)(see question 6), the purpose of R₁ is to
A.	provide a reference voltage.
B.	limit current through the diode.
C.	limit voltage to the op-amp.
D.	provide output voltage sampling.
Answer» C. limit voltage to the op-amp.

Discussion

359.	For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using X_C = ________.
A.	0.707 C
B.	1.414 C
C.	1.3 C
D.	0.785 C
Answer» D. 0.785 C

Discussion

360.	What is the purpose of an additional RC filter section in a power supply circuit?
A.	Increase the dc voltage component
B.	Increase the ac voltage component
C.	Decrease the ac voltage component
D.	None of the above
Answer» D. None of the above

Discussion

361.	What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier?
A.	0
B.	0.5
C.	1
D.	2
Answer» C. 1

Discussion

362.	If the value of full-load voltage is the same as the no-load voltage, the voltage regulation calculated is ________ %, which is the best expected.
A.	0
B.	1
C.	99
D.	100
Answer» B. 1

Discussion

363.	Calculate the ripple of a filter output having a 20-V dc component and a 1.7 V_r(rms) ac component.
A.	6%
B.	8.5%
C.	85%
D.	58%
Answer» C. 85%

Discussion

364.	A voltage regulator has a no-load output of 18 V and a full-load output of 17.3 V. The percent load regulation is
A.	0.25%.
B.	96.1%.
C.	4.05%.
D.	1.04%.
Answer» D. 1.04%.

Discussion

365.	Refer to the given figure. This circuit is known as
A.	a series-pass voltage regulator.
B.	a shunt voltage regulator.
C.	a step-up switching regulator.
D.	a step-down switching regulator.
Answer» C. a step-up switching regulator.

Discussion

366.	Calculate the voltage regulation of a power supply having V_NL = 50 V and V_FL = 48 V.
A.	4.17%
B.	5.2%
C.	6.2%
D.	7.1%
Answer» B. 5.2%

Discussion

367.	Clipping is the result of
A.	the input signal being too large.
B.	the transistor being driven into saturation.
C.	the transistor being driven into cutoff.
D.	all of the above
Answer» E.

Discussion

368.	Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?
A.	base bias
B.	collector-feedback bias
C.	voltage-divider bias
D.	emitter bias
Answer» C. voltage-divider bias

Discussion

369.	Schottky diodes are also known as
A.	PIN diodes.
B.	hot carrier diodes.
C.	step-recovery diodes.
D.	tunnel diodes.
Answer» C. step-recovery diodes.

Discussion

370.	The Schottky diode is used
A.	in high-power circuits.
B.	in circuits requiring negative resistance.
C.	in very fast-switching circuits.
D.	in power supply rectifiers.
Answer» D. in power supply rectifiers.

Discussion

371.	You have an application for a diode to be used in a tuning circuit. A type of diode to use might be
A.	an LED.
B.	a Schottky diode.
C.	a Gunn diode.
D.	a varactor.
Answer» E.

Discussion

372.	Which of the following is not a linear/digital IC?
A.	Phase-locked loop
B.	Voltage-controlled oscillator
C.	Passive filter
D.	Comparator
Answer» D. Comparator

Discussion

373.	A 339 IC is an example of a fourteen-pin DIP that can be made to function as a ________.
A.	comparator
B.	555 timer
C.	D to A converter
D.	ladder network
Answer» B. 555 timer

Discussion

374.	What is (are) general-purpose/small-signal transistors case type(s)?
A.	TO-18
B.	TO-92
C.	TO-39
D.	TO-52
E.	all of the above
Answer» F.

Discussion

375.	What is the order of doping, from heavily to lightly doped, for each region?
A.	base, collector, emitter
B.	emitter, collector, base
C.	emitter, base, collector
D.	collector, emitter, base
Answer» C. emitter, base, collector

Discussion

376.	Refer to this figure. The value of V_BC is:
A.	9.2 V
B.	9.9 V
C.	9.9 V
D.	9.2 V
Answer» E.

Discussion

377.	What is (are) common fault(s) in a BJT-based circuit?
A.	opens or shorts internal to the transistor
B.	open bias resistor(s)
C.	external opens and shorts on the circuit board
D.	all of the above
Answer» E.

Discussion

378.	The dc load line on a family of collector characteristic curves of a transistor shows the
A.	saturation region.
B.	cutoff region.
C.	active region.
D.	all of the above
Answer» E.

Discussion

379.	Refer to this figure. Determine the minimum value of V_IN from the following that will saturate this transistor.
A.	13.21 V
B.	12.51 V
C.	0.7 V
D.	9.4 V
Answer» B. 12.51 V

Discussion

380.	The magnitude of dark current in a phototransistor usually falls in what range?
A.	mA
B.	A
C.	nA
D.	pA
Answer» D. pA

Discussion

381.	A 35 mV signal is applied to the base of a properly biased transistor with an r'_e = 8 and R_C = 1 k. The output signal voltage at the collector is:
A.	3.5 V
B.	28.57 V
C.	4.375 mV
D.	4.375 V
Answer» E.

Discussion

382.	Refer to this figure. The value of V_CE is:
A.	9.9 V
B.	9.2 V
C.	0.7 V
D.	19.3 V
Answer» B. 9.2 V

Discussion

383.	nMOS and pMOS transistors can be used for class B.
A.	True
B.	False
Answer» B. False

Discussion

384.	Determine V_B1.
A.	0 V
B.	0.7 V
C.	9.3 V
D.	10.7 V
Answer» E.

Discussion

385.	A class A amplifier with R_C = 3.3 k and R_E = 1.2 k has a V_CC = 20 V. Find I_C(sat).
A.	4.4 mA
B.	6.1 mA
C.	16.7 mA
D.	20 mA
Answer» B. 6.1 mA

Discussion

386.	In practice, the efficiency of a capacitively coupled class A amplifier is about ________%.
A.	25
B.	40
C.	70
D.	10
Answer» E.

Discussion

387.	Which of the following describe(s) a power amplifier?
A.	It can handle large power.
B.	It can handle large current.
C.	It does not provide much voltage gain.
D.	All of the above
Answer» E.

Discussion

388.	Categorize the power efficiency of each class of amplifier, from worst to best.
A.	A, B, AB, D
B.	A, AB, D, B
C.	A, AB, B, D
Answer» D.

Discussion

389.	Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier?
A.	Quasi-complementary
B.	Transformer-coupled
C.	Complementary-symmetry
D.	None of the above
Answer» B. Transformer-coupled

Discussion

390.	What is the maximum efficiency of a class B circuit?
A.	90%
B.	78.5%
C.	50%
D.	25%
Answer» C. 50%

Discussion

391.	The maximum efficiency of a class B amplifier is ________ percent.
A.	50
B.	25
C.	70
D.	79
Answer» E.

Discussion

392.	The maximum efficiency of a transformer-coupled class A amplifier is ________.
A.	25%
B.	50%
C.	78.5%
D.	63.6%
Answer» C. 78.5%

Discussion

393.	A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180 of the input cycle.
A.	A
B.	B
C.	C
D.	AB
Answer» E.

Discussion

394.	The class ________ amplifier is biased below cutoff.
A.	A
B.	AB
C.	B
D.	C
Answer» E.

Discussion

395.	Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?
A.	It needs two separate voltage sources.
B.	There is crossover distortion in the output signal.
C.	It does not provide exact switching of one transistor off and the other on at the zero-voltage condition.
D.	All of the above
Answer» E.

Discussion

396.	Which of the power amplifiers has the lowest overall efficiency?
A.	Class A
B.	Class B or AB
C.	Class C
D.	Class D
Answer» B. Class B or AB

Discussion

397.	Calculate the efficiency of a class B amplifier for a supply voltage of V_CC = 20 V with peak output voltage of V_L(p) = 18 V. Assume R_L = 16.
A.	78.54%
B.	75%
C.	70.69%
D.	50%
Answer» D. 50%

Discussion

398.	This is an example of the output swing for a class ________ amplifier.
A.	A
B.	B
C.	AB
D.	C
E.	D
Answer» B. B

Discussion

399.	For BJT power transistors, the collector terminal is always connected to the transistor's case
A.	for easy circuit connection.
B.	to prevent shorts.
C.	because the collector terminal is the critical terminal for heat dissipation.
D.	because the collector terminal is located nearest the case.
Answer» D. because the collector terminal is located nearest the case.

Discussion

400.	Refer to this figure. The approximate voltages on the base, collector, and emitter, respectively, are
A.	0.7 V, 6.8 V, 0 V.
B.	0 V, 0 V, 0 V.
C.	0.7 V, 15 V, 0 V.
D.	0.7 V, 0 V, 15 V.
Answer» D. 0.7 V, 0 V, 15 V.

Discussion

Explore topic-wise MCQs in Engineering.

Refer to this figure. Find the tunnel diode symbol.

Refer to this figure. If the load current increases, IR will ________ and IZ will ________.

LEDs are made out of

The normal operating region for a zener diode is the

Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R1 need to have?

A switching regulator that is configured as a voltage-inverter produces what type of output?

Refer to the given figure. This circuit is called

In Figure 17-1(a)(see question 6), the purpose of R1 is to

For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using XC = ________.

What is the purpose of an additional RC filter section in a power supply circuit?

What is the ratio of the period of the output voltage to the period of the input voltage in a full-wave rectifier?

If the value of full-load voltage is the same as the no-load voltage, the voltage regulation calculated is ________ %, which is the best expected.

Calculate the ripple of a filter output having a 20-V dc component and a 1.7 Vr(rms) ac component.

A voltage regulator has a no-load output of 18 V and a full-load output of 17.3 V. The percent load regulation is

Refer to the given figure. This circuit is known as

Calculate the voltage regulation of a power supply having VNL = 50 V and VFL = 48 V.

Clipping is the result of

Which transistor bias circuit arrangement provides good stability using negative feedback from collector to base?

Schottky diodes are also known as

The Schottky diode is used

You have an application for a diode to be used in a tuning circuit. A type of diode to use might be

Which of the following is not a linear/digital IC?

A 339 IC is an example of a fourteen-pin DIP that can be made to function as a ________.

What is (are) general-purpose/small-signal transistors case type(s)?

What is the order of doping, from heavily to lightly doped, for each region?

Refer to this figure. The value of VBC is:

What is (are) common fault(s) in a BJT-based circuit?

The dc load line on a family of collector characteristic curves of a transistor shows the

Refer to this figure. Determine the minimum value of VIN from the following that will saturate this transistor.

The magnitude of dark current in a phototransistor usually falls in what range?

A 35 mV signal is applied to the base of a properly biased transistor with an r'e = 8 and RC = 1 k. The output signal voltage at the collector is:

Refer to this figure. The value of VCE is:

nMOS and pMOS transistors can be used for class B.

Determine VB1.

A class A amplifier with RC = 3.3 k and RE = 1.2 k has a VCC = 20 V. Find IC(sat).

In practice, the efficiency of a capacitively coupled class A amplifier is about ________%.

Which of the following describe(s) a power amplifier?

Categorize the power efficiency of each class of amplifier, from worst to best.

Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier?

What is the maximum efficiency of a class B circuit?

The maximum efficiency of a class B amplifier is ________ percent.

The maximum efficiency of a transformer-coupled class A amplifier is ________.

A class ________ amplifier is biased slightly above cutoff and operates in the linear region for slightly more than 180 of the input cycle.

The class ________ amplifier is biased below cutoff.

Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

Which of the power amplifiers has the lowest overall efficiency?

Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16.

This is an example of the output swing for a class ________ amplifier.

For BJT power transistors, the collector terminal is always connected to the transistor's case

Refer to this figure. The approximate voltages on the base, collector, and emitter, respectively, are

Refer to this figure. If the load current increases, I_R will ________ and I_Z will ________.

Refer to the given figure. If the output of the circuit were to be a short circuit, what power rating would R₁ need to have?

In Figure 17-1(a)(see question 6), the purpose of R₁ is to

For a full-wave rectifier with ac ripple at 120 Hz, the impedance of a capacitor can be calculated using X_C = ________.

Calculate the ripple of a filter output having a 20-V dc component and a 1.7 V_r(rms) ac component.

Calculate the voltage regulation of a power supply having V_NL = 50 V and V_FL = 48 V.

Refer to this figure. The value of V_BC is:

Refer to this figure. Determine the minimum value of V_IN from the following that will saturate this transistor.

A 35 mV signal is applied to the base of a properly biased transistor with an r'_e = 8 and R_C = 1 k. The output signal voltage at the collector is:

Refer to this figure. The value of V_CE is:

Determine V_B1.

A class A amplifier with R_C = 3.3 k and R_E = 1.2 k has a V_CC = 20 V. Find I_C(sat).

Calculate the efficiency of a class B amplifier for a supply voltage of V_CC = 20 V with peak output voltage of V_L(p) = 18 V. Assume R_L = 16.