MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2101. |
The circuit in figure is |
| A. | CE amplifier |
| B. | CB amplifier |
| C. | Constant voltage source |
| D. | Constant current source |
| Answer» D. Constant current source | |
| 2102. |
FET can used in |
| A. | buffer amplifier circuits |
| B. | cascade amplifier circuits |
| C. | digital circuits |
| D. | all of the above |
| Answer» B. cascade amplifier circuits | |
| 2103. |
Each of two cascaded stages has a voltage gain of 30. The overall gain is |
| A. | 3 |
| B. | 9 |
| C. | 30 |
| D. | 900 |
| Answer» E. | |
| 2104. |
A bipolar transistor is a __________ controlled devices whereas a FET is a __________ controlled devices. |
| A. | current, voltage |
| B. | current, current |
| C. | voltage, current |
| D. | voltage, voltage |
| Answer» B. current, current | |
| 2105. |
Which of the following are difficult to be fabricated in a monolithic IC? |
| A. | Inductors |
| B. | Large capacitors |
| C. | Small capacitors |
| D. | Both (a) and (b) |
| Answer» E. | |
| 2106. |
In an op-amp a common mode signal is applied to |
| A. | inverting terminal |
| B. | non-inverting terminal |
| C. | both terminals |
| D. | one or both the terminals |
| Answer» D. one or both the terminals | |
| 2107. |
The ripple factor of a full wave rectifier is about 0.5. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2108. |
Which of the following op-amp circuits has zero resistance in the feedback path? |
| A. | Inverting amplifier |
| B. | Summing amplifier |
| C. | Source follower |
| D. | Integrating amplifier |
| Answer» D. Integrating amplifier | |
| 2109. |
In an LC filter, the ripple factor, |
| A. | increases with load current |
| B. | increases with load resistance |
| C. | remains constant with the load current |
| D. | has the lowest value |
| Answer» E. | |
| 2110. |
High frequency oscillations can be caused by |
| A. | electric coupling |
| B. | magnetic coupling |
| C. | ground loop |
| D. | all of the above |
| Answer» E. | |
| 2111. |
In order to obtain triangular pulses at the output of the circuit in the figure, the input should be. |
| A. | grounded |
| B. | a square wave |
| C. | Triangular wave |
| D. | Trigger |
| Answer» B. a square wave | |
| 2112. |
The circuit in figure is |
| A. | rectifier |
| B. | voltage to frequency converter |
| C. | frequency to voltage converter |
| D. | logarithmic amplifier |
| Answer» E. | |
| 2113. |
A feedback network to be used with an amplifier to provide oscillation is tested and found to give an output of 0.124 V with a 0.5 V input. What will be the effect on output if the amplifier's gain is twice that required by the Barkhausen criterion? |
| A. | Linear oscillations |
| B. | Non-linear oscillations |
| C. | Damped oscillations |
| D. | No oscillations |
| Answer» E. | |
| 2114. |
A delay equalizer is a |
| A. | low pass filter |
| B. | band pass filter |
| C. | all pass filter |
| D. | high pass filter |
| Answer» C. all pass filter | |
| 2115. |
The disadvantage of transformer coupling in amplifier is |
| A. | cost of transformer at audio frequencies |
| B. | size of transformer at audio frequencies |
| C. | size of transformer at radio frequencies |
| D. | cost and size of transformer at audio frequencies |
| Answer» E. | |
| 2116. |
Which one of the following devices is not used as the controller in a stabilizer? |
| A. | DIAC |
| B. | TRIAC |
| C. | SCR |
| D. | Power transistor |
| Answer» B. TRIAC | |
| 2117. |
For an I/p of Vs = 5 sin t (assuming ideal diode), circuit shown in the figure will behave as a |
| A. | clipper, sine wave clipped at -2 V |
| B. | clamper, sine wave clamped at -2 V |
| C. | clamper, sine wave clamped at 0 volts |
| D. | clipper, sine wave clipped at 2 V |
| Answer» C. clamper, sine wave clamped at 0 volts | |
| 2118. |
A three-section RC phase shift oscillator has R = 10K ohms and C = 0.001 F. If the oscillator is to be made variable using the same value of R, what should be the value of capacitor to obtain a frequency if 1 kHz? |
| A. | 636 pF |
| B. | 180 pF |
| C. | 65 pF |
| D. | 30 pF |
| Answer» D. 30 pF | |
| 2119. |
The frequency response of an ideal tuned amplifier should be as represented in figure by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 2120. |
In a rectifier circuit the filter capacitance is increased. Then the ripple will |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | either (a) or (b) |
| Answer» C. remain the same | |
| 2121. |
Aperture circuit produces __________ in sample hold circuit. |
| A. | the total sampling time |
| B. | delay between the instance at which hold command is initiated and the instance at which O/P starts tracking I/P |
| C. | the time taken by O/P to settle within the specified 1% error band, that of the I/P |
| D. | time required by holding capacitor to reach upto the level close to input |
| Answer» C. the time taken by O/P to settle within the specified 1% error band, that of the I/P | |
| 2122. |
A Hartley oscillator uses |
| A. | a tapped capacitor |
| B. | a tapped inductor |
| C. | a tapped inductor for inductive feedback |
| D. | none of the above |
| Answer» D. none of the above | |
| 2123. |
A clipper |
| A. | adds a dc component to the input signal |
| B. | removes signal voltages above or below a specified value |
| C. | both (a) and (b) |
| D. | either (a) or (b) |
| Answer» C. both (a) and (b) | |
| 2124. |
The circuit in figure is |
| A. | positive clamper |
| B. | negative clamper |
| C. | positive peak clipper |
| D. | negative peak clipper |
| Answer» B. negative clamper | |
| 2125. |
For a good voltage amplifier, its input impedance should be |
| A. | low as compared to the resistance of the source |
| B. | high as compared to the resistance of the source |
| C. | always inductive |
| D. | always capacitive |
| Answer» C. always inductive | |
| 2126. |
Gain stability in an oscillator can bs achieved by |
| A. | providing negative feedback |
| B. | providing positive feedback |
| C. | using low Q circuits |
| D. | controlling the gain |
| Answer» E. | |
| 2127. |
A pulse transformer uses |
| A. | ferrite core |
| B. | air core |
| C. | iron core |
| D. | copper core |
| Answer» B. air core | |
| 2128. |
A CE amplifier is the most common BJT amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2129. |
A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The current amplification is |
| A. | 2.5 |
| B. | 12.5 |
| C. | 25 |
| D. | 125 |
| Answer» C. 25 | |
| 2130. |
In a CE amplifier circuit |
| A. | Q point must lie on both dc and ac load lines |
| B. | Q point lies on dc load line |
| C. | Q point lies on ac load line |
| D. | Q point lies may or may not lie on both dc and ac load lines |
| Answer» B. Q point lies on dc load line | |
| 2131. |
Assertion (A): In a common source amplifier with source terminal at ac ground the voltage gain is about gm rdReason (R): A common source amplifier is a source follower circuit |
| A. | Both A and R are correct and R is correct explanation for A |
| B. | Both A and R are correct but R is not correct explanation for A |
| C. | A is correct R is wrong |
| D. | A is wrong R is correct |
| Answer» D. A is wrong R is correct | |
| 2132. |
In applications where __________ input resistance is needed, the JFET is preferred to the bipolar transistor. |
| A. | zero |
| B. | very low |
| C. | low |
| D. | high |
| Answer» E. | |
| 2133. |
In the circuit shown in the figure, the approximate voltage at the transistor, |
| A. | base and emitter respectively are -8 V and -7.3 V |
| B. | base and collector respectively are -8 V and -5 V |
| C. | Collector and emitter respectively are -5 V and -7.3 |
| D. | base, emitter and collector respectively are -8 V, 7.3 V and -5 V |
| Answer» E. | |
| 2134. |
A quiescent state of a transistor implies |
| A. | zero bias |
| B. | no output |
| C. | no distortion |
| D. | no input signal |
| Answer» D. no input signal | |
| 2135. |
A transistor may fail due to |
| A. | open weld at the wire leads to the semi-conductor |
| B. | short circuit caused by momentary overloads |
| C. | overheating due to circuit failures |
| D. | any of the above |
| Answer» E. | |
| 2136. |
A Clapp's oscillator is |
| A. | a modified Hartley oscillator |
| B. | a modified Colpitt's oscillator |
| C. | a modified RC oscillator |
| D. | none of the above |
| Answer» C. a modified RC oscillator | |
| 2137. |
In a P-N-P transistor, with normal bias, the emitter junction |
| A. | is always reverse biased |
| B. | offers very high resistance |
| C. | offers a low resistance |
| D. | remains open |
| Answer» D. remains open | |
| 2138. |
In saturation region JFET acts like a |
| A. | bipolar device |
| B. | short circuit |
| C. | switch |
| D. | resistance |
| Answer» E. | |
| 2139. |
The emitter bias largely depends on |
| A. | gain |
| B. | signal input |
| C. | I |
| D. | <sub>E</sub> |
| E. | none of the above |
| Answer» D. <sub>E</sub> | |
| 2140. |
A limiter circuit can be built using a diode and resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2141. |
An amplifier signal is made up of just two frequencies 1000 Hz. The output signal consists of 500 Hz and 25000 Hz frequencies. This may be attributed to |
| A. | harmonic distortion |
| B. | intermodulation distortion |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 2142. |
If input ac is 10 Vrms, then maximum voltage that will appear across the diode of a half wave rectifier with a capacitor I/P filter will be |
| A. | 10 V |
| B. | 14 V |
| C. | 20 V |
| D. | 28 V |
| Answer» C. 20 V | |
| 2143. |
In figure the voltage gain is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-314-2.png"> |
| B. | <i>r</i> |
| C. | <sub><i>e</i></sub> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-314-3.png"> |
| E. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-314-4.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/321-314-3.png"> | |
| 2144. |
One of the major applications of JFET is in |
| A. | switching |
| B. | constant current-source |
| C. | constant voltage-source |
| D. | electron flow regulation |
| Answer» B. constant current-source | |
| 2145. |
CC circuit is suitable for impedance matching. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2146. |
Oscillation of frequency in Hartley oscillator is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-486-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-486-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-486-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-486-4.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/analog-electronics/331-486-3.png"> | |
| 2147. |
Which of the following number specification refers to FET with one gate? |
| A. | 2N |
| B. | 3N |
| C. | 3Y |
| D. | 3X |
| Answer» C. 3Y | |
| 2148. |
In the graphical analysis of an amplifier circuit, the slope of dc load line depends on |
| A. | load resistance only |
| B. | collector supply voltage only |
| C. | both load resistance and collector supply voltage |
| D. | none of the above |
| Answer» B. collector supply voltage only | |
| 2149. |
In figure we need an ac ground. The proper value of C is |
| A. | 1000 F |
| B. | 100 F |
| C. | 10 F |
| D. | 1 F |
| Answer» B. 100 F | |
| 2150. |
In a negative feedback amplifier A = 100, = 0.04 and Vs = 50 mV, then feedback will be |
| A. | 4 |
| B. | 8 |
| C. | 10 |
| D. | 2 |
| Answer» B. 8 | |