MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1136 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.
| 1101. |
The load impedance ZL of a CE amplifier has R and L in series. The phase difference between output and input will be |
| A. | 180° |
| B. | 0 |
| C. | more than 90° but less than 180° |
| D. | more than 180° but less than 270° |
| Answer» E. | |
| 1102. |
The use of a capacitor filter in a rectifier circuit gives satisfactory performance only when the load |
| A. | current is high |
| B. | current is low |
| C. | voltage is high |
| D. | voltage is low |
| Answer» C. voltage is high | |
| 1103. |
CMRR of an op-amp is about 0.1. |
| A. | 1 |
| B. | |
| C. | s1 |
| D. | s1 + s2 + s3 + s4 |
| Answer» C. s1 | |
| 1104. |
The static characteristic of an adequately forward biased p-n junction is a straight line if the plot is of |
| A. | log I vs log V |
| B. | log I vs V |
| C. | I vs log V |
| D. | I vs V |
| Answer» C. I vs log V | |
| 1105. |
Heat sink results in |
| A. | slower dissipation of heat to atmosphere |
| B. | faster dissipation of heat to atmosphere |
| C. | lower ambient temperature |
| D. | lower transistor power |
| Answer» C. lower ambient temperature | |
| 1106. |
Which component is allowed to pass through it by a choke filter? |
| A. | Dc |
| B. | Ac |
| C. | Both dc and ac |
| D. | Only high frequency ac |
| Answer» B. Ac | |
| 1107. |
It is desired to reduce distortion in a CE amplifier circuit. We should |
| A. | reduce emitter current |
| B. | reduce collector current |
| C. | reduce ac base voltage |
| D. | reduce base emitter voltage |
| Answer» E. | |
| 1108. |
The ripple factor of a full wave rectifier is about 0.5 |
| A. | 1 |
| B. | |
| C. | The zener diode is uses as a constant voltage source |
| D. | The SCR is a silicon rectifier with a gate electrode to control when current flows from cathode to anode |
| Answer» B. | |
| 1109. |
In the amplifier circuit of figure hfe = 100 and hie = 1000 Ω. The voltage gain of amplifier is about |
| A. | 0.33 |
| B. | 0.5 |
| C. | 0.66 |
| D. | 1 |
| Answer» E. | |
| 1110. |
Which of the following amplifier circuits has highest input impedance? |
| A. | Circuit using BJT |
| B. | Circuit using JFET |
| C. | Circuit using MOSFET |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 1111. |
When a transistor is to be at a temperature above 25°C |
| A. | smaller heat sink be provided |
| B. | maximum power rating be derated |
| C. | biasing circuit must be strengthened |
| D. | earth connections must be connected through a resistor |
| Answer» C. biasing circuit must be strengthened | |
| 1112. |
A full wave rectifier circuit using centre tapped transformer and a bridge rectifier are fed at 100 V, 50 Hz. The frequencies of outputs in these two rectifiers are |
| A. | 100 Hz each |
| B. | 50 Hz each |
| C. | 100 Hz and 50 Hz |
| D. | 50 Hz and 100 Hz |
| Answer» B. 50 Hz each | |
| 1113. |
Which of the following oscillators is suitable for frequencies in the range of mega hertz? |
| A. | RC phase shift |
| B. | Wien bridge |
| C. | Hartley |
| D. | Both (a) and (c) |
| Answer» D. Both (a) and (c) | |
| 1114. |
CC circuit is suitable for impedance matching. |
| A. | 1 |
| B. | |
| C. | 2N |
| D. | 3N |
| Answer» B. | |
| 1115. |
The output V0 in figure is |
| A. | -100 V |
| B. | -100 mV |
| C. | 10 V |
| D. | 10 mV |
| Answer» C. 10 V | |
| 1116. |
Which op-amp circuit uses a resistance in series with input and capacitor in feedback path? |
| A. | Differentiating amplifier |
| B. | Integrating amplifier |
| C. | Logarithmic amplifier |
| D. | Exponential amplifier |
| Answer» C. Logarithmic amplifier | |
| 1117. |
A CB amplifier has a = 0.98 and RL = 600 Ω. If IE = 3.5 mA, the current gain is |
| A. | 1 |
| B. | 0.98 |
| C. | 0.98 x 3.5 |
| Answer» C. 0.98 x 3.5 | |
| 1118. |
A CB amplifier has re = 6 Ω, RL = 600 Ω and a = 0.98. The voltage gain is |
| A. | 100 |
| B. | 600 x 0.98 |
| C. | 98 |
| D. | 6 |
| Answer» D. 6 | |
| 1119. |
A voltage tripler circuit and voltage quadrupler circuit use identical components. Then |
| A. | voltage regulation in both circuits will be same |
| B. | voltage regulation in both may or may not be same |
| C. | voltage regulation in quadrupler circuit will be better than in tripler circuit |
| D. | voltage regulation in quadrupler circuit will be poorer than in tripler circuit |
| Answer» E. | |
| 1120. |
A transistor in CE mode is in saturation region. Then the collector is almost at |
| A. | ground potential |
| B. | a potential equal to VCC |
| C. | a potential equal to 0.5 VCC |
| D. | a potential equal to 2 VCC |
| Answer» B. a potential equal to VCC | |
| 1121. |
In a circuit of figure, Vs = 10 cos(ωt) power drawn by the 2Ω resistor is 4 watts. The power factor is |
| A. | 0.3 |
| B. | 0.4 |
| C. | 0.6 |
| D. | none |
| Answer» D. none | |
| 1122. |
In a transistor amplifier, the reverse saturation current ICO |
| A. | Doubles for every 10°C rise in temperature |
| B. | Doubles for every 20°C rise in temperature |
| C. | Increase 100°C with temperature |
| D. | Doubles for every 5°C rise in temperature |
| Answer» B. Doubles for every 20¬∞C rise in temperature | |
| 1123. |
In figure The minimum and maximum load currents are |
| A. | 0 and 60 mA |
| B. | 0 and 120 mA |
| C. | 10 mA and 60 mA |
| D. | 10 mA and 120 mA |
| Answer» C. 10 mA and 60 mA | |
| 1124. |
If the input to the ideal comparator shown in the figure is a sinusoidal signal of 8 V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of |
| A. | 43497 |
| B. | 43525 |
| C. | 43617 |
| D. | 43800 |
| Answer» C. 43617 | |
| 1125. |
Assertion (A): Manufacturer's quote h parameters of transistor Reason (R): h parameters of a transistor are easiest to measure |
| 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» B. Both A and R are correct but R is not correct explanation for A | |
| 1126. |
Negative feedback in amplifier |
| A. | reduces gain |
| B. | increases frequency and phase distortion |
| C. | reduces bandwidth |
| D. | increases noise |
| Answer» B. increases frequency and phase distortion | |
| 1127. |
Figure is a 24 Vr stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current are |
| A. | 320 Ω, 10 mA |
| B. | 400 Ω, 15 mA |
| C. | 400 Ω, 10 mA |
| D. | 320 Ω, 15 mA |
| Answer» E. | |
| 1128. |
A half wave diode circuit using ideal diode has an input voltage 20 sin ωt volts. Then average and rms values of output voltage are |
| A. | and 10 V |
| B. | and 10 V |
| C. | and 5 V |
| D. | and 5 V |
| Answer» C. and 5 V | |
| 1129. |
For a base current of 10 μA, what is the value of collector current in common emitter if βdc = 100 |
| A. | 10 μA |
| B. | 100 μA |
| C. | 1 mA |
| D. | 10 mA |
| Answer» D. 10 mA | |
| 1130. |
Pick the odd-one out |
| A. | Hartley Oscillator |
| B. | Colpitt oscillator |
| C. | Clapp oscillator |
| D. | Weinbridge oscillator |
| Answer» E. | |
| 1131. |
Which of the following are linear ICs? |
| A. | RF and IF amplifiers |
| B. | Wide band amplifier |
| C. | Audio amplifiers |
| D. | All of the above |
| Answer» E. | |
| 1132. |
If the Q of a single stage single tuned amplifier is doubled, the bandwidth will |
| A. | remain the same |
| B. | become half |
| C. | become double |
| D. | become four times |
| Answer» C. become double | |
| 1133. |
An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be |
| A. | about 50 Hz |
| B. | about 5 Hz |
| C. | about 2.38 Hz |
| D. | about 70.5 Hz |
| Answer» D. about 70.5 Hz | |
| 1134. |
In figure the collector to emitter breakdown voltage of the transistor (βVCEO) should be |
| A. | more than VCC |
| B. | more than 0.5 VCC |
| C. | more than VCC + E |
| D. | more than 2 VCC |
| Answer» C. more than VCC + E | |
| 1135. |
The noise figure of FET circuit is |
| A. | independent of the quiescent point |
| B. | dependent on the quiescent point only |
| C. | dependent on the triggering mechanism |
| D. | independent of all above |
| Answer» B. dependent on the quiescent point only | |
| 1136. |
To prevent a DC return between source and load, it is necessary to use |
| A. | resistor between source and load |
| B. | inductor between source and load |
| C. | capacitor between source and load |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |