Explore topic-wise MCQs in Engineering.

This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

1251.

A feedback amplifier has a ________ upper 3-dB frequency and a ________ lower 3-dB frequency compared to an amplifier without feedback.

A. smaller, higher
B. higher, smaller
C. smaller, smaller
D. higher, higher
Answer» C. smaller, smaller
1252.

A pass transistor may be used in a series regulator, as the current-carrying device.

A. True
B. False
Answer» C.
1253.

For an IC regulator, the input voltage must be at least 2 V above the regulated output voltage.

A. True
B. False
Answer» B. False
1254.

A switching regulator can be configured as a step-up or a step-down voltage regulator.

A. True
B. False
Answer» B. False
1255.

IC voltage regulators are sometimes called three-terminal regulators.

A. True
B. False
Answer» B. False
1256.

Under no-load, a shunt regulator has minimum current through the control element.

A. True
B. False
Answer» C.
1257.

The ________ is (are) an adjustable voltage regulator.

A. series 7800 ICs
B. series 7900 ICs
C. LM317
D. None of the above
Answer» D. None of the above
1258.

The ________ the ac variation with respect to the dc level, the ________ the filter circuit's operation.

A. smaller, better
B. larger, better
C. smaller, worse
D. None of the above
Answer» B. larger, better
1259.

IC units provide regulation of ________.

A. a fixed positive voltage
B. a fixed negative voltage
C. an adjustably set voltage
D. All of the above
Answer» E.
1260.

The ________ values of capacitor filter provide ________ ripple and ________ average voltage.

A. larger, more, higher
B. smaller, less, lower
C. smaller, more, higher
D. larger, less, higher
Answer» E.
1261.

Collector-feedback bias provides very poor stability with negative feedback from collector to base.

A. True
B. False
Answer» C.
1262.

A transistor is operating in a linear fashion at saturation.

A. True
B. False
Answer» C.
1263.

Base biasing is common in relay driver circuits.

A. True
B. False
Answer» B. False
1264.

The formula DC = IB/IC is correct.

A. True
B. False
Answer» C.
1265.

The base bias circuit arrangement provides poor stability because its Q-point varies widely with DC.

A. True
B. False
Answer» B. False
1266.

In class B operation, the current drawn from a single power supply has the form of ________ rectified signal.

A. a full-wave
B. a half-wave
C. both a full-wave and a half-wave
D. None of the above
Answer» B. a half-wave
1267.

Improvement in production techniques of power transistors have ________.

A. produced higher power ratings in small-sized packaging cases
B. increased the maximum transistor breakdown voltage
C. provided faster-switching power transistors
D. All of the above
Answer» E.
1268.

The amount of power dissipated by the transistor is the ________ of that drawn from the dc supply (set by the bias point) and the amount delivered to the ac load.

A. summation
B. product
C. difference
D. average
Answer» D. average
1269.

The complementary Darlington-connected transistor for a class B amplifier provides ________ output current and ________ output resistance.

A. higher, higher
B. higher, lower
C. lower, lower
D. lower, higher
Answer» C. lower, lower
1270.

The greater the power handled by the power transistor, ________ the case temperature.

A. the higher
B. the lower
C. there is no change in
D. None of the above
Answer» B. the lower
1271.

In a class A transformer-coupled amplifier, the ________ the value of VCEmax and the ________ the value of VCEmin, the ________ the efficiency to (from) the theoretical limit of 50%.

A. larger, smaller, farther
B. larger, smaller, closer
C. smaller, larger, closer
D. None of the above
Answer» C. smaller, larger, closer
1272.

Class D operation can achieve power efficiency of over ________.

A. 90%
B. 78.5%
C. 50%
D. 25%
Answer» B. 78.5%
1273.

In Fourier technique, any periodic distorted waveform can be represented by ________ the fundamental and all harmonic components.

A. multiplying
B. subtracting
C. dividing
D. adding
Answer» E.
1274.

The beta of a power transistor is generally ________.

A. more than 200
B. 100 to 200
C. less than 100
D. 0
Answer» D. 0
1275.

The fundamental component is typically ________ any harmonic component.

A. larger than
B. the same as
C. smaller than
D. None of the above
Answer» B. the same as
1276.

The class C amplifier is biased below cutoff.

A. True
B. False
Answer» B. False
1277.

Class B amplifiers are usually zero-biased.

A. True
B. False
Answer» B. False
1278.

Class B amplifiers are usually operated in push-pull to obtain an output that is a near replica of the input signal.

A. True
B. False
Answer» B. False
1279.

In a large-signal amplifier, the ac signal only needs to move over a small percentage of the total ac load line.

A. True
B. False
Answer» C.
1280.

The controlled variable on the output side of an FET transistor is a ________ level.

A. current
B. voltage
C. resistor
D. None of the above
Answer» B. voltage
1281.

The level of VDS is typically between ________ % and ________ % of VDD.

A. 0, 100
B. 10, 90
C. 25, 75
D. None of the above
Answer» D. None of the above
1282.

The coupling capacitors are ________ for the dc analysis and ________ for the ac analysis.

A. open-circuit, low impedance
B. short-circuit, low impedance
C. open-circuit, high impedance
D. None of the above
Answer» B. short-circuit, low impedance
1283.

________ levels of RS result in ________ quiescent values of ID and ________ negative values of VGS.

A. Increased, lower, less
B. Increased, higher, less
C. Increased, higher, more
D. Increased, less, lower
Answer» B. Increased, higher, less
1284.

The dc load line is drawn using the equation obtained by applying Kirchhoff's voltage law (KVL) at ________ side loop(s) of the circuit.

A. the output
B. the input
C. both the input and output
D. None of the above
Answer» C. both the input and output
1285.

In a universal JFET bias curve, the vertical scale labeled M is used for finding the solution to the ________ configuration.

A. fixed-bias
B. self-bias
C. voltage-divider
D. None of the above
Answer» D. None of the above
1286.

________ must be considered in the total design process.

A. Dc conditions
B. Level of amplification
C. Signal strength
D. All of the above
Answer» E.
1287.

The input controlling variable for an FET transistor is a ________ level.

A. resistor
B. current
C. voltage
D. All of the above
Answer» D. All of the above
1288.

For the field-effect transistor, the relationship between the input and the output quantities is ________.

A. linear
B. nonlinear
C. 3rd degree
D. None of the above
Answer» C. 3rd degree
1289.

In p-channel FETs, the level of VGS is ________ while the level of VDS is ________.

A. negative, negative
B. positive, positive
C. negative, positive
D. positive, negative
Answer» E.
1290.

In a universal JFET bias curve, the vertical scale labeled m is used to find the solution to the ________ configuration.

A. fixed-bias
B. self-bias
C. voltage-divider
D. None of the above
Answer» B. self-bias
1291.

When plotting the transfer characteristics, choosing VGS = 0.5VP will result in a drain current level of ________ IDSS.

A. 0
B. 0.25
C. 0.5
D. 1
Answer» C. 0.5
1292.

For a common-base configuration, the input impedance is relatively ________ and the output impedance quite ________.

A. high, small
B. small, high
C. small, small
D. high, high
Answer» C. small, small
1293.

For transistor amplifiers, the no-load voltage gain is ________ the loaded voltage gain.

A. smaller than
B. greater than
C. the same as
D. None of the above
Answer» C. the same as
1294.

The output voltage and the input voltage are ________ for the common-base configuration.

A. 45 out of phase
B. 90 out of phase
C. 180 out of phase
D. in phase
Answer» E.
1295.

In an emitter-follower, the output voltage is ________ with the input voltage.

A. 45 out of phase
B. 90 out of phase
C. 180 out of phase
D. in phase
Answer» E.
1296.

________ can be applied to determine the response of the ac equivalent circuit.

A. Mesh analysis
B. Node analysis
C. Thevenin's theorem
D. All of the above
Answer» E.
1297.

A Darlington pair provides a very low input impedance.

A. True
B. False
Answer» C.
1298.

The output resistance of the common-emitter amplifier is approximately equal to the collector resistance.

A. True
B. False
Answer» B. False
1299.

A coupling capacitor couples dc to an amplifier.

A. True
B. False
Answer» C.
1300.

The common-base amplifier has a good voltage gain, low input impedance, and high current gain.

A. True
B. False
Answer» C.