Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

Determine the output voltage when V1 = V2 = 1 V.

A. 0 V
B. 2 V
C. 1 V
D. 2 V
Answer» C. 1 V
Discussion
2.

How many op-amps are required to implement this equation? Vo = V1

A. 2
B. 3
C. 4
D. 1
Answer» E.
Discussion
3.

Calculate the output voltage for this circuit when V1 = 2.5 V and V2 = 2.25 V.

A. 5.25 V
B. 2.5 V
C. 2.25 V
D. 5.25 V
Answer» E.
Discussion
4.

Calculate the output voltage if V1 = 0.2 V and V2 = 0 V.

A. 0 V
B. 6.6 V
C. 4 V
D. 2 V
Answer» E.
Discussion
5.

A number of op-amp stages can be used to provide separate gains.

A. True
B. False
Answer» B. False
Discussion
6.

A diode conducts when it is forward-biased, and the anode is connected to the ________ through a limiting resistor.

A. positive supply
B. negative supply
C. cathode
D. anode
Answer» B. negative supply
Discussion
7.

As the forward current through a silicon diode increases, the internal resistance

A. increases.
B. decreases.
C. remains the same.
Answer» C. remains the same.
Discussion
8.

The voltage gain of a basic instrumentation amplifier is set by a(n)

A. diode.
B. capacitor.
C. resistor.
D. inductor.
Answer» D. inductor.
Discussion
9.

A basic ________ amplifier is formed by three op-amps and seven resistors.

A. instrumentation
B. isolation
C. log
D. antilog
Answer» B. isolation
Discussion
10.

Instrumentation amplifiers are normally used to measure

A. small differential signal voltages.
B. signals superimposed on a common-mode voltage often much larger than the signal voltage.
C. both of the above
D. none of the above
Answer» D. none of the above
Discussion
11.

Refer to given circuits. Which circuit is known as an OTA?

A. a
B. b
C. c
D. d
Answer» E.
Discussion
12.

A silicon diode measures a low value of resistance with the meter leads in both positions. The trouble, if any, is

A. the diode is open.
B. the diode is shorted to ground.
C. the diode is internally shorted.
D. the diode is working correctly.
Answer» D. the diode is working correctly.
Discussion
13.

Single-element semiconductors are characterized by atoms with ____ valence electrons.

A. 3
B. 4
C. 5
D. 2
E. none of the above
Answer» C. 5
Discussion
14.

Under normal conditions a diode conducts current when it is

A. reverse-biased.
B. forward-biased.
C. avalanched.
D. saturated.
Answer» C. avalanched.
Discussion
15.

At the cutoff frequency the output is down 20 dB.

A. True
B. False
Answer» C.
Discussion
16.

The feedback signal in a Hartley oscillator is derived from an inductive voltage in the tank circuit.

A. True
B. False
Answer» B. False
Discussion
17.

A phase-locked loop (PLL) is a feedback circuit consisting of a

A. phase detector.
B. low-pass filter.
C. VCO.
D. all of the above
Answer» E.
Discussion
18.

Coupling and bypass capacitors affect the high-frequency response of an amplifier.

A. True
B. False
Answer» C.
Discussion
19.

The lower and upper critical frequencies of an amplifier can be determined using the step-response method.

A. True
B. False
Answer» B. False
Discussion
20.

The basis for the decibel unit stems from the logarithmic response of the human ear to the intensity of sound.

A. True
B. False
Answer» B. False
Discussion
21.

OLEDs can be sprayed onto a substrate using an inkjet printer.

A. True
B. False
Answer» B. False
Discussion
22.

The silicon dioxide (SiO2) layer used in a MOSFET is ________.

A. an insulator
B. a conductor
C. a semiconductor
D. None of the above
Answer» B. a conductor
Discussion
23.

What is the normalized gain expressed in dB for the cutoff frequencies?

A. 3 dB
B. +3 dB
C. 6 dB
D. 20 dB
Answer» B. +3 dB
Discussion
24.

In which of the following are operational amplifiers (op-amps) used?

A. Oscillators
B. Filters
C. Instrumentation circuits
D. All of the above
Answer» E.
Discussion
25.

Determine the output voltage when V1 = V2 = 1 V.

A. 0 V
B. 2 V
C. 1 V
D. 2 V
Answer» E.
Discussion
26.

The term "dBm" means decibels referenced to 1 mW of power.

A. True
B. False
Answer» B. False
Discussion
27.

Bandwidth is the difference between fcl and fcu.

A. True
B. False
Answer» B. False
Discussion
28.

In an instrumentation amplifier, the output voltage is based on the ________ times a scale factor.

A. summation of the two inputs
B. product of the two inputs
C. difference between the two inputs
D. None of the above
Answer» D. None of the above
Discussion
29.

The voltage gain of a voltage buffer is ________ .

A. 1
B. 0
C. 1
D. 5
Answer» B. 0
Discussion
30.

A heat sink provides ________ thermal resistance between case and air.

A. a high
B. a low
C. the same
D. None of the above
Answer» C. the same
Discussion
31.

In the Wien bridge oscillator with R1 = R2 = R and C1 = C2 = C, a ratio of R3 to R4 will provide sufficient loop gain for the circuit to oscillate.

A. 0
B. 0.5
C. 1
D. 2
Answer» E.
Discussion
32.

The ________ are the terminals of an SCS.

A. anode, anode gate, cathode gate, and cathode
B. anode, cathode, cathode gate, and gate
C. anode, anode gate, cathode, and gate
D. anode, cathode, and gate
Answer» B. anode, cathode, cathode gate, and gate
Discussion
33.

The anode gate connection can be used to turn the SCS device ________.

A. on
B. off
C. neither on nor off
D. either on or off
Answer» E.
Discussion
34.

You have an unknown type of diode in a circuit. You measure the voltage across it and find it to be 0.3 V. The diode might be

A. a silicon diode.
B. a germanium diode.
C. a forward-biased silicon diode.
D. a reverse-biased germanium diode.
Answer» C. a forward-biased silicon diode.
Discussion
35.

An OTA has

A. a bias-current input terminal.
B. high output impedance.
C. no fixed open-loop voltage gain.
D. all of the above
Answer» E.
Discussion
36.

A decade of frequency change is a change by a factor of 10.

A. True
B. False
Answer» B. False
Discussion
37.

The forward voltage across an LED is typically 0.7 V.

A. True
B. False
Answer» C.
Discussion
38.

A photodiode is used in a reverse-bias position, and it will increase conduction as the light intensity increases.

A. True
B. False
Answer» B. False
Discussion
39.

A tunnel diode has a negative-resistance characteristic.

A. True
B. False
Answer» B. False
Discussion
40.

Two types of reverse breakdown in a zener diode are avalanche and zener.

A. True
B. False
Answer» B. False
Discussion
41.

Schottky diodes are used primarily in high-frequency and fast-switching applications.

A. True
B. False
Answer» B. False
Discussion
42.

Determine the value of VDSQ.

A. 3.5 V
B. 4.86 V
C. 7.14 V
D. 10 V
Answer» B. 4.86 V
Discussion
43.

Specification sheets typically provide the value of the constant k for enhancement-type MOSFETs.

A. True
B. False
Answer» C.
Discussion
44.

Determine the quiescent values of ID and VGS.

A. 1.2 mA, 1.8 V
B. 1.5 mA, 1.5 V
C. 2.0 mA, 1.2 V
D. 3.0 mA, 0.8 V
Answer» C. 2.0 mA, 1.2 V
Discussion
45.

Seldom are current levels measured since such maneuvers require disturbing the network structure to insert the meter.

A. True
B. False
Answer» B. False
Discussion
46.

In the design of linear amplifiers, it is good design practice to choose operating points that do not crowd the saturation level or cutoff regions.

A. True
B. False
Answer» B. False
Discussion
47.

Miller's theorem is used in the high-frequency analysis of BJTs and FETs.

A. True
B. False
Answer» B. False
Discussion
48.

One characteristic of amplifiers is that the sum of the voltage gain and the bandwidth is always constant when the roll-off is 20 dB/decade.

A. True
B. False
Answer» C.
Discussion
49.

Internal transistor capacitances affect the high-frequency response of amplifiers.

A. True
B. False
Answer» B. False
Discussion
50.

What is the response time of cadmium sulfide (CdS) in photoconductive cells?

A. 100 ms
B. 50 ms
C. 25 ms
D. 10 ms
Answer» B. 50 ms
Discussion