1728 + Mcqs in Electronics McqOptions

1.	A mathematical operation for finding the area under the curve of a graph is called __________.
A.	differentiation
B.	integration
C.	curve averaging
D.	linear regression
Answer» C. curve averaging

Discussion

2.	The n-type semiconductor material is doped by adding material with electron holes.
A.	True
B.	False
Answer» C.

Discussion

3.	The first transistor was invented in 1938.
A.	True
B.	False
Answer» C.

Discussion

4.	An ac wave shape could be a sine wave, square wave, or sawtooth wave.
A.	True
B.	False
Answer» B. False

Discussion

5.	A sawtooth voltage waveform has a linear ramp that changes voltage level with respect to time.
A.	True
B.	False
Answer» B. False

Discussion

6.	The period of a 10 kHz sine wave is 10 s.
A.	True
B.	False
Answer» C.

Discussion

7.	The average value of a sine wave is .707 times the peak value.
A.	True
B.	False
Answer» C.

Discussion

8.	Germanium is the most widely used semiconductor material because of its stability at high temperatures.
A.	True
B.	False
Answer» C.

Discussion

9.	The natural elements carbon, germanium, and silicon are semiconductors.
A.	True
B.	False
Answer» B. False

Discussion

10.	The P-N junction is a barrier to electron flow.
A.	True
B.	False
Answer» B. False

Discussion

11.	The number of electrons in the outer shell of carbon, germanium, and silicon is 5.
A.	True
B.	False
Answer» C.

Discussion

12.	In the given circuit, if Rf is reduced to 8 k, the circuit becomes the ______.
A.	digital-to-analog converter
B.	averaging amplifier
C.	scaling adder
D.	summing amplifier with gain greater than unity
Answer» C. scaling adder

Discussion

13.	The reference voltage for the comparator in the given circuit equals ______.
A.	0 V
B.	+8.8 V
C.	+16 V
D.	+7.2 V
Answer» C. +16 V

Discussion

14.	The feedback component in an op-amp integrator is a capacitor.
A.	True
B.	False
Answer» B. False

Discussion

15.	When the capacitance in an active high-pass filter increases, the critical frequency decreases.
A.	True
B.	False
Answer» B. False

Discussion

16.	The letter in the Greek alphabet used to represent wavelength is __________.
A.	lambda
B.	theta
C.	omega
D.	delta
Answer» B. theta

Discussion

17.	The __________ is defined as the ratio of a pulse width (positive or negative pulse or cycle) to the overall period of time of the wave.
A.	pulse width
B.	duty cycle
C.	phase shift
D.	active ratio
Answer» C. phase shift

Discussion

18.	Large-scale integration (LSI) ICs contain between ______ and _______ interconnected components.
A.	15,000, 150,000
B.	1,500, 15,000
C.	180, 1,000
D.	180, 1,500
Answer» C. 180, 1,000

Discussion

19.	One example of the use of a Schmitt trigger is as a(n) _____
A.	astable oscillator
B.	transition pulse generator
C.	pulse shaper
D.	buffer
Answer» D. buffer

Discussion

20.	Totem pole outputs _________ be connected __________ because ____________.
A.	can, in parallel, sometimes higher current is required
B.	cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
C.	should, in series, certain applications may require higher output voltage
D.	can, together, together they can handle larger load currents and higher output voltages
Answer» C. should, in series, certain applications may require higher output voltage

Discussion

21.	An open collector output can ________ current, but it cannot ___________________.
A.	sink, source current
B.	source, sink current
C.	sink, source voltage
D.	source, sink voltage
Answer» B. source, sink current

Discussion

22.	DC current flows in one direction, while ac current rises from zero to a maximum, then falls to zero in one direction, then rises to a maximum, then falls to zero in the opposite direction.
A.	True
B.	False
Answer» B. False

Discussion

23.	A square and a rectangular waveform appear to have a step voltage transition.
A.	True
B.	False
Answer» B. False

Discussion

24.	The duty cycle of a square wave with a pulse width of 3 s and a period of 9 s is 40%.
A.	True
B.	False
Answer» C.

Discussion

25.	The rms value of a sine wave is .707 x peak-to-peak value/2.
A.	True
B.	False
Answer» B. False

Discussion

26.	DC current transfers better over longer distances than ac current.
A.	True
B.	False
Answer» C.

Discussion

27.	CMOS circuits consume less power than TTL circuits.
A.	True
B.	False
Answer» B. False

Discussion

28.	NMOS devices use MOSFETs to implement the full range of logic gates using the universal NAND gate.
A.	True
B.	False
Answer» C.

Discussion

29.	Schottky TTL logic gates overcome the problem of saturation delay time.
A.	True
B.	False
Answer» B. False

Discussion

30.	A three-state output TTL can have three possible outputs: LOW, HIGH, or FLOATING.
A.	True
B.	False
Answer» C.

Discussion

31.	Integrated-injection logic offers high component density and is easier to fabricate than TTL.
A.	True
B.	False
Answer» B. False

Discussion

32.	The forward voltage drop for a germanium transistor is 0.7 V and for a silicon transistor is 0.3 V.
A.	True
B.	False
Answer» C.

Discussion

33.	When a depletion region of a transistor is large the barrier voltage is also large.
A.	True
B.	False
Answer» B. False

Discussion

34.	The first integrated circuit was invented in 1959.
A.	True
B.	False
Answer» B. False

Discussion

35.	A covalent bond is when atoms lose valence shell electrons.
A.	True
B.	False
Answer» C.

Discussion

36.	When a voltage is placed across a semiconductor, free electrons move toward the negative voltage.
A.	True
B.	False
Answer» C.

Discussion

37.	One example of the use of an S-R flip-flop is as a(n):
A.	transition pulse generator
B.	astable oscillator
C.	racer
D.	switch debouncer
Answer» E.

Discussion

38.	Which is not an analog-to-digital (ADC) conversion error?
A.	differential nonlinearity
B.	missing code
C.	incorrect code
D.	offset
Answer» B. missing code

Discussion

39.	Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to:
A.	sample and hold the output of the binary counter during the conversion process
B.	stabilize the comparator's threshold voltage during the conversion process
C.	stabilize the input analog signal during the conversion process
D.	sample and hold the D/A converter staircase waveform during the conversion process
Answer» D. sample and hold the D/A converter staircase waveform during the conversion process

Discussion

40.	The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:
A.	quantization
B.	accuracy
C.	resolution
D.	monotonicity
Answer» D. monotonicity

Discussion

41.	Subtraction is commutative.
A.	True
B.	False
Answer» C.

Discussion

42.	The expressions, , are equivalent.
A.	True
B.	False
Answer» B. False

Discussion

43.	PMOS and NMOS ____________________________.
A.	represent MOSFET devices utilizing either P-channel or N-channel devices exclusively within a given gate
B.	are enhancement type CMOS devices used to produce a series of high-speed logic known as 74HC
C.	represent positive and negative MOS type devices that can be operated from differential power supplies and are compatible with operational amplifiers
D.	none of the above
Answer» B. are enhancement type CMOS devices used to produce a series of high-speed logic known as 74HC

Discussion

44.	The number of inputs that a gate output can drive without possible logic errors is the _______.
A.	propagation delay
B.	noise margin
C.	speed-power product
D.	fanout
Answer» E.

Discussion

45.	In order to get a HIGH or a LOW output from an open-collector gate, an external _________ must be connected between +VCC and the collector.
A.	pull-down resistor
B.	pull-up resistor
C.	diode
D.	buffer
Answer» C. diode

Discussion

46.	An undefined state, neither high nor low, is called _________.
A.	don't care
B.	floating
C.	minimum state
D.	noise
Answer» C. minimum state

Discussion

47.	Delay times and current/voltage values remain constant regardless of temperature or other operating conditions for robust circuits like TTL.
A.	True
B.	False
Answer» C.

Discussion

48.	5400 TTL series logic chips are made to military specifications.
A.	True
B.	False
Answer» B. False

Discussion

49.	Totem pole output circuits can change states faster than open-collector output circuits.
A.	True
B.	False
Answer» B. False

Discussion

50.	The characteristic that a change of one binary step on the input of a digital-to-analog converter (DAC) should cause exactly one step change on the output is called ________.
A.	resolution
B.	monotonicity
C.	linearity
D.	accuracy
Answer» C. linearity

Discussion

Explore topic-wise MCQs in Testing Subject.

A mathematical operation for finding the area under the curve of a graph is called __________.

The n-type semiconductor material is doped by adding material with electron holes.

The first transistor was invented in 1938.

An ac wave shape could be a sine wave, square wave, or sawtooth wave.

A sawtooth voltage waveform has a linear ramp that changes voltage level with respect to time.

The period of a 10 kHz sine wave is 10 s.

The average value of a sine wave is .707 times the peak value.

Germanium is the most widely used semiconductor material because of its stability at high temperatures.

The natural elements carbon, germanium, and silicon are semiconductors.

The P-N junction is a barrier to electron flow.

The number of electrons in the outer shell of carbon, germanium, and silicon is 5.

In the given circuit, if Rf is reduced to 8 k, the circuit becomes the ______.

The reference voltage for the comparator in the given circuit equals ______.

The feedback component in an op-amp integrator is a capacitor.

When the capacitance in an active high-pass filter increases, the critical frequency decreases.

The letter in the Greek alphabet used to represent wavelength is __________.

The __________ is defined as the ratio of a pulse width (positive or negative pulse or cycle) to the overall period of time of the wave.

Large-scale integration (LSI) ICs contain between ______ and _______ interconnected components.

One example of the use of a Schmitt trigger is as a(n) _____

Totem pole outputs _________ be connected __________ because ____________.

An open collector output can ________ current, but it cannot ___________________.

DC current flows in one direction, while ac current rises from zero to a maximum, then falls to zero in one direction, then rises to a maximum, then falls to zero in the opposite direction.

A square and a rectangular waveform appear to have a step voltage transition.

The duty cycle of a square wave with a pulse width of 3 s and a period of 9 s is 40%.

The rms value of a sine wave is .707 x peak-to-peak value/2.

DC current transfers better over longer distances than ac current.

CMOS circuits consume less power than TTL circuits.

NMOS devices use MOSFETs to implement the full range of logic gates using the universal NAND gate.

Schottky TTL logic gates overcome the problem of saturation delay time.

A three-state output TTL can have three possible outputs: LOW, HIGH, or FLOATING.

Integrated-injection logic offers high component density and is easier to fabricate than TTL.

The forward voltage drop for a germanium transistor is 0.7 V and for a silicon transistor is 0.3 V.

When a depletion region of a transistor is large the barrier voltage is also large.

The first integrated circuit was invented in 1959.

A covalent bond is when atoms lose valence shell electrons.

When a voltage is placed across a semiconductor, free electrons move toward the negative voltage.

One example of the use of an S-R flip-flop is as a(n):

Which is not an analog-to-digital (ADC) conversion error?

Sample-and-hold circuits in analog-to digital converters (ADCs) are designed to:

The difference between analog voltage represented by two adjacent digital codes, or the analog step size, is the:

Subtraction is commutative.

The expressions, , are equivalent.

PMOS and NMOS ____________________________.

The number of inputs that a gate output can drive without possible logic errors is the _______.

In order to get a HIGH or a LOW output from an open-collector gate, an external _________ must be connected between +VCC and the collector.

An undefined state, neither high nor low, is called _________.

Delay times and current/voltage values remain constant regardless of temperature or other operating conditions for robust circuits like TTL.

5400 TTL series logic chips are made to military specifications.

Totem pole output circuits can change states faster than open-collector output circuits.

The characteristic that a change of one binary step on the input of a digital-to-analog converter (DAC) should cause exactly one step change on the output is called ________.

Large-scale integration (LSI) ICs contain between and _ interconnected components.

Totem pole outputs _ be connected because ______.

An open collector output can current, but it cannot ___________.