MCQOPTIONS
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MCQOPTIONS
This section includes 194 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The voltage required to force the differential output to zero is called _______. |
| A. | input-offset current |
| B. | input-offset voltage |
| C. | input bias current |
| D. | slew rate voltage |
| Answer» C. input bias current | |
| 102. |
If an input signal is applied to the inverting input of an op-amp with the noninverting input grounded, the output signal would be opposite in polarity to the input. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 103. |
Operational amplifiers (op-amps) use internal capacitive coupling between stages. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 104. |
The 555 timer can be connected to operate a(n) ___________. |
| A. | astable multivibrator |
| B. | bistable multivibrator |
| C. | monostable multivibrator |
| D. | astable multivibrator and a monostable multivibrator |
| Answer» E. | |
| 105. |
The ideal output impedance for an operational amplifier is 0 . |
| A. | 1 |
| B. | |
| Answer» B. | |
| 106. |
A voltage-follower op-amp has the output connected directly to the inverting input. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 107. |
A virtual ground is a(n) ______ ground because this point is at zero volts. |
| A. | ordinary |
| B. | voltage |
| C. | chassis |
| D. | earth |
| Answer» C. chassis | |
| 108. |
If the input to a comparator is a sine wave, the output is a(n) _________. |
| A. | ramp voltage |
| B. | sine wave |
| C. | sawtooth wave |
| D. | rectangular wave |
| Answer» E. | |
| 109. |
An inverting amplifier has a phase shift of 180° from input to output. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 110. |
The frequency of a crystal is dependent on how much voltage is applied to activate it. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 111. |
The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 M, Zout = 80 , and Aol = 250,000. |
| A. | 4.7 k |
| B. | 22.7 k |
| C. | 3 M |
| D. | 68.6 k |
| Answer» B. 22.7 k | |
| 112. |
______ is NOT a characteristic of an ideal op-amp. |
| A. | Infinite voltage gain |
| B. | Minimum bandwidth |
| C. | Infinite input impedance |
| D. | Zero output impedance |
| Answer» C. Infinite input impedance | |
| 113. |
An astable multivibrator has two states. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 114. |
The common-mode rejection ratio (CMMR) is the ratio of _____ to ______. |
| A. | the differential voltage gain, the common-mode voltage gain |
| B. | the differential power gain, the common-mode power gain |
| C. | the ideal voltage gain, the actual voltage gain |
| D. | signal voltage, noise voltage |
| Answer» B. the differential power gain, the common-mode power gain | |
| 115. |
It takes 4 s for the output voltage of an op-amp to rise from –14 V to +14 V. The slew rate of this op-amp is 3.5 V/s. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 116. |
A 555 timer can be configured as an astable multivibrator. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 117. |
The feedback resistor has a value of ______ in the given circuit |
| A. | 2 k |
| B. | 10.5 k |
| C. | 21 k |
| D. | 40 k |
| Answer» E. | |
| 118. |
The voltage-follower amplifier circuit has a fixed voltage gain of approximately 10. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 119. |
An open feedback resistor in an inverting or noninverting op-amp circuit can cause severe clipping of the output signal. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 120. |
Crystal oscillator circuits have a very low Q. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 121. |
The resistors Rf and Ri in an op-amp circuit control ______ . |
| A. | positive feedback and current gain |
| B. | negative feedback and power gain |
| C. | negative feedback and voltage gain |
| D. | open and closed loop gain |
| Answer» D. open and closed loop gain | |
| 122. |
In a common-mode input to an op-amp, both inputs are connected to the same signal source. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 123. |
If an input signal is applied to the inverting input of an op-amp with the noninverting input grounded, the output signal would be opposite in polarity with the input. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 124. |
An oscillator whose frequency can be controlled by an input "control voltage" is called a(n) ______ . |
| A. | PLL |
| B. | Schmitt trigger |
| C. | VCO |
| D. | S-R latch |
| Answer» D. S-R latch | |
| 125. |
An S-R flip-flop is an example of a bistable multivibrator circuit. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 126. |
What starts a free-running multivibrator? |
| A. | a trigger |
| B. | an input signal |
| C. | an external circuit |
| D. | nothing |
| Answer» E. | |
| 127. |
In order for an output to swing above and below a zero reference, the op-amp circuit requires: |
| A. | a resistive feedback network |
| B. | zero offset |
| C. | a wide bandwidth |
| D. | a negative and positive supply |
| Answer» E. | |
| 128. |
What is the output voltage? |
| A. | 15 V |
| B. | 5 V |
| C. | –5 V |
| D. | –15 V |
| Answer» D. ‚Äì15 V | |
| 129. |
An astable multivibrator is also known as a: |
| A. | one-shot multivibrator |
| B. | free-running multivibrator |
| C. | bistable multivibrator |
| D. | monostable multivibrator |
| Answer» C. bistable multivibrator | |
| 130. |
An operational amplifier contains a differential amplifier, a voltage amplifier, and an output amplifier. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 131. |
Input impedance [Zin(I)] of an inverting amplifier is approximately equal to: |
| A. | Ri |
| B. | Rf + Ri |
| C. | ‚àû |
| D. | Rf – Ri |
| Answer» B. Rf + Ri | |
| 132. |
What is the frequency of this 555 astable multivibrator? |
| A. | 278 Hz |
| B. | 178 Hz |
| C. | 78 Hz |
| D. | 8 Hz |
| Answer» C. 78 Hz | |
| 133. |
This circuit is a differentiator. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 134. |
Common-mode signals have _____. |
| A. | the same amplitude |
| B. | the same phase |
| C. | the same frequency |
| D. | All of the above |
| Answer» E. | |
| 135. |
The given circuit is ___. |
| A. | an inverting amplifier |
| B. | a noninverting amplifier |
| C. | a voltage follower |
| D. | a differential amplifier |
| Answer» C. a voltage follower | |
| 136. |
What is the difference between common-mode and differential-mode input signals? |
| A. | phase relationship |
| B. | voltage |
| C. | current |
| D. | apparent power |
| Answer» B. voltage | |
| 137. |
The Schmitt trigger is a two-state device that is used for: |
| A. | pulse shaping |
| B. | peak detection |
| C. | input noise rejection |
| D. | filtering |
| Answer» B. peak detection | |
| 138. |
When a capacitor is used in place of a resistor in an op-amp network, its placement determines: |
| A. | open- or closed-loop gain |
| B. | integration or differentiation |
| C. | saturation or cutoff |
| D. | addition or subtraction |
| Answer» C. saturation or cutoff | |
| 139. |
A circuit that has an output equal to the algebraic sum of the inputs is called a(n) ______ . |
| A. | integrator amplifier |
| B. | summing amplifier |
| C. | differential amplifier |
| D. | voltage multiplier |
| Answer» C. differential amplifier | |
| 140. |
An ideal amplifier should have: |
| A. | high input current |
| B. | zero offset |
| C. | high output impedance |
| D. | moderate gain |
| Answer» C. high output impedance | |
| 141. |
What is the output waveform of the circuit? |
| A. | sine wave |
| B. | square wave |
| C. | sawtooth wave |
| D. | triangle wave |
| Answer» C. sawtooth wave | |
| 142. |
A virtual ground is a ground for current, but not for voltage. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 143. |
The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals: |
| A. | the ratio of the input resistance to the feedback resistance |
| B. | the open-loop voltage gain Aol |
| C. | the feedback resistance divided by the input resistance |
| D. | the input resistance |
| Answer» D. the input resistance | |
| 144. |
With negative feedback, the returning signal: |
| A. | aids the input signal |
| B. | is proportional to output current |
| C. | opposes the input signal |
| D. | is proportional to differential voltage gain |
| Answer» D. is proportional to differential voltage gain | |
| 145. |
How many logic states does an S-R flip-flop have? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 146. |
If the frequency of an astable multivibrator is 54.86 kHz then its period is 1.82 s. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 147. |
This circuit is operating in a closed-loop mode. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 148. |
If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value? |
| A. | 7.82 V |
| B. | saturation |
| C. | cutoff |
| D. | 9.52 V |
| Answer» E. | |
| 149. |
The voltage gain of the amplifier in the given circuit would increase if ______. |
| A. | the feedback resistor was decreased in value |
| B. | the input voltage was increased |
| C. | the input resistor was increased in value |
| D. | None of the above |
| Answer» E. | |
| 150. |
A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier? |
| A. | common-mode |
| B. | darlington |
| C. | differential |
| D. | operational |
| Answer» D. operational | |