MCQOPTIONS
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MCQOPTIONS
This section includes 1728 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input? |
| A. | 3.5 mV |
| B. | ground |
| C. | 1.42 mV |
| D. | 0.56 mV |
| Answer» D. 0.56 mV | |
| 102. |
If ground is applied to the (+) terminal of an inverting op-amp, the ( ) terminal will: |
| A. | not need an input resistor |
| B. | be virtual ground |
| C. | have high reverse current |
| D. | not invert the signal |
| Answer» C. have high reverse current | |
| 103. |
With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio? |
| A. | 87.9 dB |
| B. | 43.9 dB |
| C. | 43.9 dB |
| D. | 87.9 dB |
| Answer» E. | |
| 104. |
If the input to a comparator is a sine wave, the output is a: |
| A. | ramp voltage |
| B. | sine wave |
| C. | rectangular wave |
| D. | sawtooth wave |
| Answer» D. sawtooth wave | |
| 105. |
What three subcircuits does a phase locked loop (PLL) consist of? |
| A. | phase comparator, comparator, and VCO |
| B. | phase comparator, bandpass filter, and VCO |
| C. | phase comparator, bandpass filter, and demodulator |
| D. | phase comparator, low-pass filter, and VCO |
| Answer» E. | |
| 106. |
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 | |
| 107. |
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 | |
| 108. |
With negative feedback, the returning signal |
| A. | is proportional to the output current |
| B. | is proportional to the differential voltage gain |
| C. | opposes the input signal |
| D. | aids the input signal |
| Answer» D. aids the input signal | |
| 109. |
What is the output waveform? |
| A. | sine wave |
| B. | square wave |
| C. | +15 V |
| D. | 15 V |
| Answer» B. square wave | |
| 110. |
The closed-loop voltage gain of an inverting amplifier equals: |
| A. | the ratio of the input resistance to the feedback resistance |
| B. | the open-loop voltage gain |
| C. | the feedback resistance divided by the input resistance |
| D. | the input resistance |
| Answer» D. the input resistance | |
| 111. |
What is the cutoff frequency of this low-pass filter? |
| A. | 4.8 kHz |
| B. | 3.8 kHz |
| C. | 2.8 kHz |
| D. | 1.8 kHz |
| Answer» E. | |
| 112. |
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 | |
| 113. |
What starts a free-running multivibrator? |
| A. | a trigger |
| B. | an input signal |
| C. | an external circuit |
| D. | nothing |
| Answer» E. | |
| 114. |
A portion of the output that provides circuit stabilization is considered to be: |
| A. | negative feedback |
| B. | distortion |
| C. | open-loop |
| D. | positive feedback |
| Answer» B. distortion | |
| 115. |
Which of the following cannot actually move? |
| A. | majority carriers |
| B. | ions |
| C. | holes |
| D. | free electrons |
| Answer» C. holes | |
| 116. |
What electrical characteristic of intrinsic semiconductor material is controlled by the addition of impurities? |
| A. | conductivity |
| B. | resistance |
| C. | power |
| D. | all of the above |
| Answer» B. resistance | |
| 117. |
In "p" type material, minority carriers would be: |
| A. | holes |
| B. | dopants |
| C. | slower |
| D. | electrons |
| Answer» E. | |
| 118. |
What can a semiconductor sense? |
| A. | magnetism |
| B. | temperature |
| C. | pressure |
| D. | all of the above |
| Answer» E. | |
| 119. |
When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called? |
| A. | energy gap |
| B. | hole |
| C. | electron-hole pair |
| D. | recombination |
| Answer» C. electron-hole pair | |
| 120. |
Silicon atoms combine into an orderly pattern called a: |
| A. | covalent bond |
| B. | crystal |
| C. | semiconductor |
| D. | valence orbit |
| Answer» C. semiconductor | |
| 121. |
In "n" type material, majority carriers would be: |
| A. | holes |
| B. | dopants |
| C. | slower |
| D. | electrons |
| Answer» E. | |
| 122. |
Minority carriers are many times activated by: |
| A. | heat |
| B. | pressure |
| C. | dopants |
| D. | forward bias |
| Answer» B. pressure | |
| 123. |
Which semiconductor material is made from coal ash? |
| A. | germanium |
| B. | silicon |
| C. | tin |
| D. | carbon |
| Answer» B. silicon | |
| 124. |
Elements with 1, 2, or 3 valence electrons usually make excellent: |
| A. | conductors |
| B. | semiconductors |
| C. | insulators |
| D. | neutral |
| Answer» B. semiconductors | |
| 125. |
Which material may also be considered a semiconductor element? |
| A. | carbon |
| B. | ceramic |
| C. | mica |
| D. | argon |
| Answer» B. ceramic | |
| 126. |
What is the voltage across R1 if the P-N junction is made of silicon? |
| A. | 12 V |
| B. | 11.7 V |
| C. | 11.3 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 127. |
If conductance increases as temperature increases, this is known as a: |
| A. | positive coefficient |
| B. | negative current flow |
| C. | negative coefficient |
| D. | positive resistance |
| Answer» D. positive resistance | |
| 128. |
Solid state devices were first manufactured during: |
| A. | World War 2 |
| B. | 1904 |
| C. | 1907 |
| D. | 1960 |
| Answer» E. | |
| 129. |
Electron pair bonding occurs when atoms: |
| A. | lack electrons |
| B. | share holes |
| C. | lack holes |
| D. | share electrons |
| Answer» E. | |
| 130. |
How many valence electrons are in every semiconductor material? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 131. |
What is a type of doping material? |
| A. | extrinsic semiconductor material |
| B. | pentavalent material |
| C. | n-type semiconductor |
| D. | majority carriers |
| Answer» C. n-type semiconductor | |
| 132. |
When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material: |
| A. | 1949, William Schockley |
| B. | 1955, Walter Bratten |
| C. | 1959, Robert Noyce |
| D. | 1960, John Bardeen |
| Answer» D. 1960, John Bardeen | |
| 133. |
A P-N junction mimics a closed switch when it: |
| A. | has a low junction resistance |
| B. | is reverse biased |
| C. | cannot overcome its barrier voltage |
| D. | has a wide depletion region |
| Answer» B. is reverse biased | |
| 134. |
What is this circuit? |
| A. | a low-pass filter |
| B. | a high-pass filter |
| C. | a bandpass filter |
| D. | a band-stop filter |
| Answer» E. | |
| 135. |
A noninverting closed-loop op-amp circuit generally has a gain factor: |
| A. | less than one |
| B. | greater than one |
| C. | of zero |
| D. | equal to one |
| Answer» C. of zero | |
| 136. |
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. | |
| 137. |
Op-amps used as high- and low-pass filter circuits employ which configuration? |
| A. | noninverting |
| B. | comparator |
| C. | open-loop |
| D. | inverting |
| Answer» E. | |
| 138. |
The major difference between ground and virtual ground is that virtual ground is only a: |
| A. | voltage reference |
| B. | current reference |
| C. | power reference |
| D. | difference reference |
| Answer» B. current reference | |
| 139. |
The ratio between differential gain and common-mode gain is called: |
| A. | amplitude |
| B. | differential-mode rejection |
| C. | common-mode rejection |
| D. | phase |
| Answer» D. phase | |
| 140. |
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 | |
| 141. |
If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary? |
| A. | 6240 ohms |
| B. | 2.4 kilohms |
| C. | 410 ohms |
| D. | 0.62 kilohms |
| Answer» B. 2.4 kilohms | |
| 142. |
A circuit that uses an amplifier with passive filter elements is called a(n): |
| A. | relaxation oscillator |
| B. | signal generator |
| C. | differential amplifier |
| D. | active filter |
| Answer» E. | |
| 143. |
The input offset current equals the |
| A. | average of two base currents |
| B. | collector current divided by the current gain |
| C. | difference between two base-emitter voltages |
| D. | difference between two base currents |
| Answer» E. | |
| 144. |
The voltage follower has a: |
| A. | closed-loop voltage gain of unity |
| B. | small open-loop voltage gain |
| C. | closed-loop bandwidth of zero |
| D. | large closed-loop output impedance |
| Answer» B. small open-loop voltage gain | |
| 145. |
What is the output waveform of the circuit? |
| A. | sine wave |
| B. | square wave |
| C. | sawtooth wave |
| D. | triangle wave |
| Answer» C. sawtooth wave | |
| 146. |
What is the current through the LED? |
| A. | 0 mA |
| B. | 23 mA |
| C. | 18 mA |
| D. | 13 mA |
| Answer» E. | |
| 147. |
The characteristic curve for the complex model of a silicon diode shows that |
| A. | the barrier potential is 0 V |
| B. | the barrier potential stays fixed at 0.7 V |
| C. | the barrier potential increases slightly with an increase in current |
| D. | the barrier potential decreases slightly with an increase in current |
| Answer» D. the barrier potential decreases slightly with an increase in current | |
| 148. |
A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms? |
| A. | 1.4 mV rms |
| B. | 650 mV rms |
| C. | 4.55 V rms |
| D. | 0.455 V rms |
| Answer» D. 0.455 V rms | |
| 149. |
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 |
| C. | <i>A<sub>ol</sub></i> |
| D. | the feedback resistance divided by the input resistance |
| E. | the input resistance |
| Answer» D. the feedback resistance divided by the input resistance | |
| 150. |
What is the current through the diode? |
| A. | 1 mA |
| B. | 0.975 mA |
| C. | 0.942 mA |
| D. | 0.0 mA |
| Answer» B. 0.975 mA | |