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MCQOPTIONS
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.
| 101. |
What is the range of the capacitor Cds? |
| A. | 0.01 to 0.1 pF |
| B. | 0.1 to 1 pF |
| C. | 0.1 to 1 nF |
| D. | 0.1 to 1 F |
| Answer» C. 0.1 to 1 nF | |
| 102. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input voltage for the rated output if the amplifier voltage gain is 20 dB. |
| A. | 1.225 mV |
| B. | 12.25 mV |
| C. | 122.5 mV |
| D. | 1.225 V |
| Answer» E. | |
| 103. |
A 3-dB drop in hfe will occur at a frequency defined by ________. |
| A. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca09_0320a.gif"> |
| B. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca09_0320b.gif"> |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 104. |
An amplifier rated at 30-W output is connected to a 5- speaker. Calculate the input power required for full power output if the power gain is 20 dB. |
| A. | 3 mW |
| B. | 30 mW |
| C. | 300 mW |
| D. | 3 W |
| Answer» D. 3 W | |
| 105. |
The larger capacitive elements of the design will determine the ________ cutoff frequency. |
| A. | low |
| B. | mid |
| C. | high |
| Answer» B. mid | |
| 106. |
Determine the break frequency for this circuit. |
| A. | 15.915 Hz |
| B. | 159.15 Hz |
| C. | 31.85 Hz |
| D. | 318.5 Hz |
| Answer» C. 31.85 Hz | |
| 107. |
What is the ratio of the output power to the input power at the cutoff frequencies in a normalized frequency response plot? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.707 |
| D. | 1 |
| Answer» C. 0.707 | |
| 108. |
What is the ratio of the output voltage to the input voltage at the cutoff frequencies in a normalized frequency response plot? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.707 |
| D. | 1 |
| Answer» D. 1 | |
| 109. |
Which of the following statements is true for a square-wave signal? |
| A. | It is composed of both even and odd harmonics. |
| B. | It is composed only of odd harmonics. |
| C. | It is composed only of even harmonics. |
| D. | The harmonics waveforms are also square waves. |
| Answer» C. It is composed only of even harmonics. | |
| 110. |
A change in frequency by a factor of ________ is equivalent to 1 decade. |
| A. | 2 |
| B. | 10 |
| C. | 5 |
| D. | 20 |
| Answer» C. 5 | |
| 111. |
What magnitude voltage gain corresponds to a decibel gain of 50? |
| A. | 31.6238 |
| B. | 316.228 |
| C. | 3162.38 |
| D. | 31623.8 |
| Answer» C. 3162.38 | |
| 112. |
By what other name(s) are the cutoff frequencies in a frequency response plot called? |
| A. | Corner frequency |
| B. | Break frequency |
| C. | Half-power frequency |
| D. | All of the above |
| Answer» E. | |
| 113. |
The ________-frequency response of a transformer-coupled system is calculated primarily by the stray capacitance between the turns of the primary and secondary windings. |
| A. | low |
| B. | mid |
| C. | high |
| Answer» D. | |
| 114. |
Which of the following configurations does (do) not involve the Miller effect capacitance? |
| A. | Common-emitter |
| B. | Common-base |
| C. | Common-collector |
| D. | All of the above |
| Answer» C. Common-collector | |
| 115. |
MOSFETs make better power switches than BJTs because they have |
| A. | lower turn-off times. |
| B. | lower on-state resistance. |
| C. | a positive temperature coefficient. |
| D. | all of the above |
| Answer» E. | |
| 116. |
When VGS = 0.5 Vp gm is ________ the maximum value. |
| A. | one-fourth |
| B. | one-half |
| C. | three-fourths |
| Answer» C. three-fourths | |
| 117. |
MOSFET digital switching is used to produce which digital gates? |
| A. | inverters |
| B. | NOR gates |
| C. | NAND gates |
| D. | all of the above |
| Answer» E. | |
| 118. |
Referring to the transfer characteristics shown below, calculate gm at VGSQ = 1 V. |
| A. | 2 mS |
| B. | 3 mS |
| C. | 4 mS |
| D. | 5 mS |
| Answer» C. 4 mS | |
| 119. |
There is a ________ phase inversion between gate and source in a source follower. |
| A. | 0 |
| B. | 90 |
| C. | 180 |
| D. | none of the above |
| Answer» B. 90 | |
| 120. |
Refer to this figure. If C4 opened, the signal voltage at the drain of Q1 would |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | distort. |
| Answer» D. distort. | |
| 121. |
A change in frequency by a factor of ________ is equivalent to 1 octave. |
| A. | 2 |
| B. | 10 |
| C. | 5 |
| D. | 20 |
| Answer» B. 10 | |
| 122. |
What is the ratio of the capacitive reactance XCS to the input resistance RI of the input RC circuit of a single-stage BJT amplifier at the low-frequency cutoff? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.75 |
| D. | 1.0 |
| Answer» E. | |
| 123. |
For which of the following frequency region(s) can the coupling and bypass capacitors no longer be replaced by the short-circuit approximation? |
| A. | Low-frequency |
| B. | Mid-frequency |
| C. | High-frequency |
| D. | All of the above |
| Answer» B. Mid-frequency | |
| 124. |
Determine the lower cutoff frequency of this network. |
| A. | 15.8 Hz |
| B. | 46.13 Hz |
| C. | 238.73 Hz |
| D. | 1575.8 Hz |
| Answer» D. 1575.8 Hz | |
| 125. |
The smaller capacitive elements of the design will determine the ________ cutoff frequencies. |
| A. | low |
| B. | mid |
| C. | high |
| Answer» D. | |
| 126. |
The theoretical efficiency of a class D amplifier is |
| A. | 75%. |
| B. | 85%. |
| C. | 90%. |
| D. | 100%. |
| Answer» E. | |
| 127. |
A common-source amplifier is similar in configuration to which BJT amplifier? |
| A. | common-base |
| B. | common-collector |
| C. | common-emitter |
| D. | emitter-follower |
| Answer» D. emitter-follower | |
| 128. |
Refer to this figure. If R6 opened, the signal at the drain of Q1 would |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | distort. |
| Answer» D. distort. | |
| 129. |
Refer to this figure. Find the value of VD. |
| A. | 20 V |
| B. | 11 V |
| C. | 10 V |
| D. | 9 V |
| Answer» E. | |
| 130. |
In a common-base amplifier, the input signal is connected to the |
| A. | base. |
| B. | collector. |
| C. | emitter. |
| D. | output. |
| Answer» D. output. | |
| 131. |
Which of the following represent(s) the advantage(s) of the system approach over the r-model approach? |
| A. | Thevenin's theorem can be used. |
| B. | The effect of changing the load can be determined by a simple equation. |
| C. | There is no need to go back to the ac equivalent model and analyze the entire network. |
| D. | All of the above |
| Answer» E. | |
| 132. |
The differential amplifier has |
| A. | one input and one output. |
| B. | two inputs and two outputs. |
| C. | two inputs and one output. |
| D. | one input and two outputs. |
| Answer» D. one input and two outputs. | |
| 133. |
The emitter-follower configuration has a ________ impedance at the input and a ________ impedance at the output. |
| A. | low, low |
| B. | low, high |
| C. | high, low |
| D. | high, high |
| Answer» D. high, high | |
| 134. |
The differential amplifier produces outputs that are |
| A. | common mode. |
| B. | in-phase with the input voltages. |
| C. | the sum of the two input voltages. |
| D. | the difference of the two input voltages. |
| Answer» E. | |
| 135. |
The ________ model suffers from being limited to a particular set of operating conditions if it is to be considered accurate. |
| A. | hybrid equivalent |
| B. | r |
| C. | <sub>e</sub> |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/beta.gif"> |
| E. | Thevenin |
| Answer» B. r | |
| 136. |
FET amplifiers provide ________. |
| A. | excellent voltage gain |
| B. | high input impedance |
| C. | low power consumption |
| D. | All of the above |
| Answer» E. | |
| 137. |
CMOS digital switches use |
| A. | n-channel and p-channel D-MOSFETs in series. |
| B. | n-channel and p-channel D-MOSFETs in parallel. |
| C. | n-channel and p-channel E-MOSFETs in series. |
| D. | n-channel and p-channel E-MOSFETs in parallel. |
| Answer» D. n-channel and p-channel E-MOSFETs in parallel. | |
| 138. |
Refer to this figure. If gm = 4000 mS and a signal of 75 mV rms is applied to the gate, calculate the p-p output voltage. |
| A. | 990 mV |
| B. | 1.13 V p-p |
| C. | 2.8 V p-p |
| D. | 990 V p-p |
| Answer» D. 990 V p-p | |
| 139. |
Refer to this figure. If C2 shorted, Vout would |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | distort. |
| Answer» E. | |
| 140. |
The input resistance at the gate of a FET is extremely |
| A. | high. |
| B. | low. |
| Answer» B. low. | |
| 141. |
What is the range of the current gain for BJT transistor amplifiers? |
| A. | less than 1 |
| B. | 1 to 100 |
| C. | above 100 |
| D. | All of the above |
| Answer» E. | |
| 142. |
What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate? |
| A. | The output and input voltages are 180 out of phase. |
| B. | Gain is smaller than 1. |
| C. | Gain is larger than 1. |
| D. | None of the above |
| Answer» B. Gain is smaller than 1. | |
| 143. |
For the common-emitter fixed-bias configuration, there is a ________ phase shift between the input and output signals. |
| A. | 0 |
| B. | 45 |
| C. | 90 |
| D. | 180 |
| Answer» E. | |
| 144. |
A common-emitter amplifier has ________ voltage gain, ________ current gain, ________ power gain, and ________ input impedance. |
| A. | high, low, high, low |
| B. | high, high, high, low |
| C. | high, high, high, high |
| D. | low, low, low, high |
| Answer» C. high, high, high, high | |
| 145. |
The advantage that a Sziklai pair has over a Darlington pair is |
| A. | higher current gain. |
| B. | less input voltage is needed to turn it on. |
| C. | higher input impedance. |
| D. | higher voltage gain. |
| Answer» C. higher input impedance. | |
| 146. |
The ________ model fails to account for the output impedance level of the device and the feedback effect from output to input. |
| A. | hybrid equivalent |
| B. | r |
| C. | <sub>e</sub> |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/beta.gif"> |
| E. | Thevenin |
| Answer» C. <sub>e</sub> | |
| 147. |
Refer to this figure. Calculate the value of VB. |
| A. | 5 V |
| B. | 3.7 V |
| C. | 20 V |
| D. | 3 V |
| Answer» C. 20 V | |
| 148. |
You have a need to apply an amplifier with a very high power gain. Which of the following would you choose? |
| A. | common-collector |
| B. | common-base |
| C. | common-emitter |
| D. | emitter-follower |
| Answer» D. emitter-follower | |
| 149. |
What is the voltage gain of a feedback pair connection? |
| A. | 1 |
| B. | 1 |
| C. | 100 |
| D. | 100 |
| Answer» B. 1 | |
| 150. |
Refer to this figure. Determine the value of Av. |
| A. | 49.6 |
| B. | 5 |
| C. | 100 |
| D. | 595 |
| Answer» C. 100 | |