MCQOPTIONS
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MCQOPTIONS
This section includes 158 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The ac variations at the output side of power supply circuits are called . |
| A. | ripples |
| B. | pulses |
| C. | waves |
| D. | filters |
| Answer» B. pulses | |
| 102. |
A common emitter circuit is also called circuit. |
| A. | grounded emitter |
| B. | grounded collector |
| C. | grounded base |
| D. | emitter follower |
| Answer» B. grounded collector | |
| 103. |
An open fuse circuit has a resistance equal to |
| A. | zero |
| B. | unity |
| C. | at least 100Ω at standard |
| D. | infinity |
| Answer» E. | |
| 104. |
What is the purpose of the emitter capacitor? |
| A. | to forward bias the emitter |
| B. | to reduce noise in the amplifier |
| C. | to avoid drop in gain |
| D. | to stabilize emitter voltage |
| Answer» D. to stabilize emitter voltage | |
| 105. |
An ideal differential amplifiers common mode rejection ratio is |
| A. | infinite |
| B. | zero |
| C. | unity |
| D. | undetermined |
| Answer» B. zero | |
| 106. |
What is the purpose of dc conditions in a transistor? |
| A. | to reverse bias the emitter |
| B. | to forward bias the emitter |
| C. | to set up operating point |
| D. | to turn on the transistor |
| Answer» D. to turn on the transistor | |
| 107. |
The current gain of an emitter follower is |
| A. | equal to 1 |
| B. | greater than 1 |
| C. | less than 1 |
| D. | zero |
| Answer» D. zero | |
| 108. |
What is the gain of an amplifier with negative feedback if the feedback factor is 0.01? |
| A. | 10 |
| B. | 1000 |
| C. | 100 |
| D. | 500 |
| Answer» D. 500 | |
| 109. |
The common base (CB) amplifier has a compared to CE and CC amplifier. |
| A. | lower input resistance |
| B. | larger current gain |
| C. | larger voltage gain |
| D. | higher input resistance |
| Answer» B. larger current gain | |
| 110. |
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. | |
| 111. |
What is the device in a transistor oscillator? |
| A. | lc tank circuit |
| B. | biasing circuit |
| C. | transistor |
| D. | feedback circuit |
| Answer» D. feedback circuit | |
| 112. |
At zero signal condition, a transistor sees load. |
| A. | dc |
| B. | ac |
| C. | both dc and ac |
| D. | resistive |
| Answer» B. ac | |
| 113. |
What is re equal to in terms of h parameters? |
| A. | hre / hoe |
| B. | (hre + 1) / hoe |
| C. | hie – (hre / hoe)(1 + hfe) |
| D. | hfe |
| Answer» B. (hre + 1) / hoe | |
| 114. |
To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit? |
| A. | leave circuit unchanged |
| B. | replace coupling and bypass capacitors with opens |
| C. | replace coupling and bypass capacitors with shorts |
| D. | replace vcc with ground |
| Answer» C. replace coupling and bypass capacitors with shorts | |
| 115. |
For any inverting amplifier, the impedance capacitance will be                  by a Miller effect capacitance sensitive to the gain of the amplifier and the interelectrode capacitance. |
| A. | unaffected |
| B. | increased |
| C. | decreased |
| D. | none of the above |
| Answer» D. none of the above | |
| 116. |
The Bode plot is applicable to |
| A. | all phase network |
| B. | minimum phase network |
| C. | maximum phase network |
| D. | lag lead network |
| Answer» C. maximum phase network | |
| 117. |
A transistor may be used as a switching device or as a: |
| A. | tuning device |
| B. | rectifier |
| C. | fixed resistor |
| D. | variable resistor |
| Answer» E. | |
| 118. |
Which of the following configurations does not involve the Miller effect capacitance? |
| A. | common-emitter |
| B. | common-base |
| C. | common- collector |
| D. | all of the above |
| Answer» C. common- collector | |
| 119. |
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 | |
| 120. |
A current ratio of IC/IE is usually less than one and is called |
| A. | omega |
| B. | beta |
| C. | theta |
| D. | alpha |
| Answer» E. | |
| 121. |
For audio systems, the reference level is generally accepted as                 . |
| A. | 1 mw |
| B. | 1 w |
| C. | 10 mw |
| D. | 100 mw |
| Answer» B. 1 w | |
| 122. |
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 | |
| 123. |
Which of the following elements are important in determining the gain of the system in the high-frequency region? |
| A. | interelectrode capacitances |
| B. | wiring capacitances |
| C. | miller effect capacitance |
| D. | all of the above |
| Answer» E. | |
| 124. |
In a bypass circuit, the top of a capacitor is |
| A. | an open |
| B. | a short |
| C. | an ac ground |
| D. | a mechanical ground |
| Answer» D. a mechanical ground | |
| 125. |
The output voltage of a CE amplifier is |
| A. | amplified |
| B. | inverted |
| C. | 180° out of phase with the input |
| D. | all of the above |
| Answer» E. | |
| 126. |
A coupling capacitor is |
| A. | a dc short |
| B. | an ac open |
| C. | a dc open and an ac short |
| D. | a dc short and an ac open |
| Answer» D. a dc short and an ac open | |
| 127. |
If VD is less than expected (normal) for a self-biased JFET circuit, then it could be caused by a(n) |
| A. | open rg. |
| B. | open gate lead. |
| C. | fet internally open at gate. |
| D. | all of the above |
| Answer» E. | |
| 128. |
Midpoint bias for a D-MOSFET is ID = , obtained by setting VGS = 0. |
| A. | idss / 2 |
| B. | idss / 3.4 |
| C. | idss |
| Answer» D. | |
| 129. |
All MOSFETs are subject to damage from electrostatic discharge (ESD). |
| A. | true |
| B. | false |
| Answer» B. false | |
| 130. |
The has a physical channel between the drain and source. |
| A. | d-mosfet |
| B. | e-mosfet |
| C. | v-mosfet |
| D. | none of the above |
| Answer» B. e-mosfet | |
| 131. |
A JFET data sheet specifies VGS(off) = –10 V and IDSS = 8 mA. Find the value of ID when VGS = –3 V. |
| A. | 2 ma |
| B. | 1.4 ma |
| C. | 4.8 ma |
| D. | 3.92 ma |
| Answer» E. | |
| 132. |
Which of the following devices has the highest input resistance? |
| A. | diode |
| B. | jfet |
| C. | mosfet |
| D. | bipolar junction transistor |
| Answer» D. bipolar junction transistor | |
| 133. |
What does DC vary with? |
| A. | ic |
| B. | ºc |
| C. | both ic and ºc |
| D. | ic’, but not ºc |
| Answer» D. ic’, but not ºc | |
| 134. |
A certain transistor has IC = 15 mA and IB = 167 µA; βDC is: |
| A. | 15 |
| B. | 167 |
| C. | 0.011 |
| D. | 90 |
| Answer» E. | |
| 135. |
A BJT has an IB of 50 µA and a βDC of 75; IC is: |
| A. | 375 ma |
| B. | 37.5 ma |
| C. | 3.75 ma |
| D. | 0.375 ma |
| Answer» D. 0.375 ma | |
| 136. |
Which of the following is true for an npn or pnp transistor? |
| A. | ie = ib + ic |
| B. | ib = ic+ ie |
| C. | ic = ib + ie |
| D. | none of the above |
| Answer» B. ib = ic+ ie | |
| 137. |
The value of βDC |
| A. | is fixed for any particular transistor. |
| B. | varies with temperature. |
| C. | varies with ic. |
| D. | varies with temperature and ic. |
| Answer» E. | |
| 138. |
The dc load line on a family of collector characteristic curves of a transistor shows the |
| A. | saturation region. |
| B. | cutoff region. |
| C. | active region. |
| D. | all of the above |
| Answer» E. | |
| 139. |
If the operating point changes, the h-parameters of transistor |
| A. | also change |
| B. | do not change |
| C. | may or may not change |
| D. | none of above |
| Answer» B. do not change | |
| 140. |
The h- parameter approach gives correct results for |
| A. | large signals only |
| B. | small signals only |
| C. | both small and large signals |
| D. | none of the above |
| Answer» C. both small and large signals | |
| 141. |
There are h- parameters of a transistor. |
| A. | two |
| B. | four |
| C. | three |
| D. | none of the above |
| Answer» C. three | |
| 142. |
Hybrid means |
| A. | mixed |
| B. | single |
| C. | biunique |
| D. | none of the above |
| Answer» B. single | |
| 143. |
A very simple bias for a D-MOSFET is called: |
| A. | self biasing |
| B. | gate biasing |
| C. | zero biasing |
| D. | voltage- divider biasing |
| Answer» D. voltage- divider biasing | |
| 144. |
A MOSFET has how many terminals? |
| A. | 2 or 3 |
| B. | 3 |
| C. | 4 |
| D. | 3 or 4 |
| Answer» E. | |
| 145. |
When not in use, MOSFET pins are kept at the same potential through the use of: |
| A. | shipping foil |
| B. | nonconductive foam |
| C. | conductive foam |
| D. | a wrist strap |
| Answer» D. a wrist strap | |
| 146. |
Junction Field Effect Transistors (JFET) contain how many diodes? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» E. | |
| 147. |
The magnitude of dark current in a phototransistor usually falls in what range? |
| A. | ma |
| B. | ma |
| C. | na |
| D. | pa |
| Answer» D. pa | |
| 148. |
What are the two types of bipolar junction transistors? |
| A. | npn and pnp |
| B. | pnn and nnp |
| C. | ppn and nnp |
| D. | pts and stp |
| Answer» B. pnn and nnp | |
| 149. |
The term BJT is short for |
| A. | base junction transistor |
| B. | binary junction transistor |
| C. | both junction transistor |
| D. | bipolar junction transistor |
| Answer» E. | |
| 150. |
When a transistor is used as a switch, it is stable in which two distinct regions? |
| A. | saturation and active |
| B. | active and cutoff |
| C. | saturation and cutoff |
| D. | none of the above |
| Answer» D. none of the above | |