MCQOPTIONS
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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 2001. |
In figure the zener has a resistance of 5 ohms. As the load resistance is varied, the output voltage |
| A. | will remain constant at 12 V |
| B. | will vary between 12.05 and 12.65 V |
| C. | will vary from 10 to 20 V |
| D. | will remain constant at 12.05 V |
| Answer» C. will vary from 10 to 20 V | |
| 2002. |
The leakage current in CB configuration may be around |
| A. | few micro amperes |
| B. | few hundred micro amperes |
| C. | few milliamperes |
| D. | few hundred milliamperes |
| Answer» B. few hundred micro amperes | |
| 2003. |
The ripple factor of a power supply is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 2004. |
In CB amplifier the distortion of the input voltage waveform may occur due to |
| A. | very low input resistance of an amplifier |
| B. | very high input resistance of the amplifier |
| C. | improper biasing |
| D. | ripples in power supply |
| Answer» B. very high input resistance of the amplifier | |
| 2005. |
In Class C operation the collector current looks like |
| A. | full sine wave |
| B. | half sine wave |
| C. | narrow pulses |
| D. | nearly half sine wave |
| Answer» D. nearly half sine wave | |
| 2006. |
An oscillator requires an amplifier |
| A. | with negative feedback |
| B. | with positive feedback |
| C. | with either positive or negative feedback |
| D. | none of the above |
| Answer» C. with either positive or negative feedback | |
| 2007. |
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 | |
| 2008. |
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 power gain is |
| A. | 125 |
| B. | 250 |
| C. | 1125 |
| D. | 3125 |
| Answer» E. | |
| 2009. |
The minimum value of hfe of a transistor used in RC phase shift oscillator is |
| A. | 54.4 |
| B. | 45.4 |
| C. | 44.5 |
| D. | 29 |
| Answer» D. 29 | |
| 2010. |
With JFETs cascade means |
| A. | a common source driving a common gate connection |
| B. | a common gate driving a common source connection |
| C. | two FETs connected in parallel |
| D. | none of the above |
| Answer» B. a common gate driving a common source connection | |
| 2011. |
MOS circuits as compared to bipolar circuits take |
| A. | more chip area |
| B. | less chip area |
| C. | same chip area |
| D. | none of these |
| Answer» C. same chip area | |
| 2012. |
In a CE amplifier the dc load line is the same as ac load line when |
| A. | ac collector resistance and dc collector resistance are equal |
| B. | ac collector resistance and dc emitter resistance are equal |
| C. | ac collector resistance is very high |
| D. | ac collector resistance is one half of dc collector resistance |
| Answer» D. ac collector resistance is one half of dc collector resistance | |
| 2013. |
In a CE transistor amplifier, when collector-emitter voltage increases |
| A. | the instantaneous operating point moves up the load line |
| B. | the instantaneous operating point moves down the line |
| C. | load current increases |
| D. | none of the above |
| Answer» B. the instantaneous operating point moves down the line | |
| 2014. |
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. | |
| 2015. |
The critical frequency of the circuit of figure is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 2016. |
In figure the dc emitter current of each transistor is about |
| A. | 4 mA |
| B. | 2 mA |
| C. | 3 mA |
| D. | 1 mA |
| Answer» E. | |
| 2017. |
Assume that op-amp in figure is ideal. If input Vi is triangular, the output V0 will be |
| A. | square wave |
| B. | sine wave |
| C. | triangular wave |
| D. | parabolic wave |
| Answer» B. sine wave | |
| 2018. |
Find resistance RB to bring transistor to threshold of saturation VCB = 0, VBE = 0.7 V, a = 0.96 |
| A. | 1.5 kΩ |
| B. | 15 kΩ |
| C. | 10 kΩ |
| D. | 1 kΩ |
| Answer» B. 15 kΩ | |
| 2019. |
In the diode circuit of figure the diodes are ideal. The average current through ammeter is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 2020. |
In figure, transistor βdc = 100 and LED voltage when it is conducting is 2 V. Then the base current which saturates the transistor is |
| A. | 18 mA |
| B. | 1.8 mA |
| C. | 0.18 mA |
| D. | 0.018 mA |
| Answer» D. 0.018 mA | |
| 2021. |
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. | |
| 2022. |
Si transistor of following figure has a = 0.9 and ICE= 0, VEE = 5 V and VCC = 13 V, then RE will be if IEQ = 1 mA |
| A. | 3 kΩ |
| B. | 4 kΩ |
| C. | 5 kΩ |
| D. | 4.3 kΩ |
| Answer» E. | |
| 2023. |
In figure, voltage across R2 = + 10 V. If VBE = 0.7 V and VE = 0.7 V and RE = 10 kΩ, current through RE is |
| A. | 1 mA |
| B. | 0.93 mA |
| C. | 2 mA |
| D. | 1.86 mA |
| Answer» C. 2 mA | |
| 2024. |
Figure shows the self bias circuit for CE amplifier and its equivalent circuit. VBB and RB respectively are |
| A. | 10 V and 4 k ohm |
| B. | 5 V and 4 k ohm |
| C. | 2 V and 4 k ohm |
| D. | 2 V and 10 k ohm |
| Answer» D. 2 V and 10 k ohm | |
| 2025. |
In figure as the load resistance is changed |
| A. | the zener current remain constant |
| B. | the load current remains constant |
| C. | the output voltage remains constant |
| D. | the output voltage and current through R remain constant |
| Answer» E. | |
| 2026. |
Study the circuit of figure and examine the following statements:1. It is an active low pass finer.2. It is a second order filter.3. The change in gain is 40 dB/decade.Which of the above statements are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» B. 1 and 2 | |
| 2027. |
The 'h' parameters of the circuit shown in the figure are hib = 25 Ω, hfb = 0.999 and hob = 10¯⁶Ω The Voltage gain is |
| A. | 0.99 |
| B. | 1.98 |
| C. | 2.0 |
| D. | 4 |
| Answer» E. | |
| 2028. |
In the op-amp circuit of figure, V0 = |
| A. | Vi |
| B. | 3 Vi |
| C. | 5 Vi |
| D. | 0.5 Vi |
| Answer» D. 0.5 Vi | |
| 2029. |
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 of these |
| Answer» D. None of these | |
| 2030. |
In figure v1 = 8 V and v2 = 8 V. Which diode will conduct? |
| A. | D1 only |
| B. | D2 only |
| C. | Both D1 and D2 |
| D. | Neither D1 nor D2 |
| Answer» D. Neither D1 nor D2 | |
| 2031. |
In figure the saturation collector current is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 2032. |
In figure what is the base current if VBE = 0.7 V |
| A. | 10 mA |
| B. | 9.3 mA |
| C. | 10 μA |
| D. | 9.3 μA |
| Answer» E. | |
| 2033. |
In figure what is value of IC if βdc = 100. Neglect VBE |
| A. | 5 mA |
| B. | 5 μA |
| C. | 10 mA |
| D. | 10 μA |
| Answer» D. 10 μA | |
| 2034. |
In the circuit of figure the diode |
| A. | will conduct as the whole cycle |
| B. | will conduct in the positive half cycle |
| C. | will not conduct |
| D. | will conduct from 30° to 150° in the positive half cycle |
| Answer» D. will conduct from 30° to 150° in the positive half cycle | |
| 2035. |
In the circuit of figure, v1 = v2 = 10 V. Then |
| A. | I1 = I2 |
| B. | I1 > I2 |
| C. | I2 > I1 |
| D. | I1 = 0 |
| Answer» D. I1 = 0 | |
| 2036. |
Figure shows a self bias circuit for FET amplifier, ID = 4 mA. Then IS = |
| A. | 4 mA |
| B. | 2 mA |
| C. | 0.4 mA |
| D. | 0.2 mA |
| Answer» B. 2 mA | |
| 2037. |
The inverting op-amp shown in the figure has an open loop gain to 100. The closed loop given Vo/Vs is |
| A. | -8 |
| B. | -9 |
| C. | -10 |
| D. | -11 |
| Answer» E. | |
| 2038. |
In the CE equivalent circuit of figure, the voltage gain is |
| A. | 200 |
| B. | 40 |
| C. | 5 |
| D. | 1000 |
| Answer» B. 40 | |
| 2039. |
Which of the following is correct? |
| A. | Voltage series feedback and decrease I/P impedance. |
| B. | Voltage shunt feedback and decrease I/P impedance. |
| C. | Voltage series feedback and increase I/P impedance. |
| D. | Voltage shunt feedback and increase I/P impedance. |
| Answer» D. Voltage shunt feedback and increase I/P impedance. | |
| 2040. |
In the circuit shown in figure, RC = 10k, RE = 150Ω, β = 100, I = 1 mA. The value of A = Vo/Vs, will be |
| A. | 50 |
| B. | 100 |
| C. | 192 |
| D. | 400 |
| Answer» D. 400 | |
| 2041. |
In figure, ID = 4 mA. Then VD = |
| A. | 20 V |
| B. | 10 V |
| C. | 30 V |
| D. | 1 V |
| Answer» C. 30 V | |
| 2042. |
In figure VBE = 0.7 V. The base current is |
| A. | above 97 μA |
| B. | about 97 mA |
| C. | about 75 μA |
| D. | about 75 mA |
| Answer» B. about 97 mA | |
| 2043. |
In figure ID = 4 mA. Then VGS = |
| A. | 4.4 V |
| B. | -4.4 V |
| C. | 0.44 V |
| D. | -0.44 V |
| Answer» C. 0.44 V | |
| 2044. |
In following figure, what will be R1 and R2 for maximum symmetrical swing if VCSat ≈ 0. Given that RE = 200 Ω, RC = 400 Ω, VCC = 20 V, β = 99 |
| A. | 6 k |
| B. | 3 k, 6 k |
| C. | 9.9 k, 2.4 k |
| D. | 2.4 k, 9.9 k |
| Answer» E. | |
| 2045. |
For CE amplifier of figure, the slope of ac load line is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 2046. |
Assertion (A): The circuit in figure produces repetitive narrow pulses when input is fed with sine or triangular waveform having peak value more than + VReason (R): The high gain op-amp produces voltages at two levels. If input is more than + V, the output is + 15 V otherwise the output is - 15 V. |
| 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 | |
| 2047. |
A non-inverting op-amp summer is shown in figure, the output voltage V0 is |
| A. | 3/2 Sin 100t |
| B. | 3 sin (100t) |
| C. | sin (100t) |
| D. | 2 sin (100t) |
| Answer» B. 3 sin (100t) | |
| 2048. |
In figure if C is replaced by short circuit then RB will be |
| A. | 425 K |
| B. | 412 K |
| C. | 474 K |
| D. | 400 K |
| Answer» D. 400 K | |
| 2049. |
In the circuit figure LED will be on when v1 is |
| A. | less than 6 V |
| B. | more than 6 V |
| C. | less than 12 V |
| D. | more than 12 V |
| Answer» C. less than 12 V | |
| 2050. |
Figure shows a portion of linear v - i characteristics of diode. If applied voltage is + 6 V, the current will be |
| A. | 42 mA |
| B. | 48 mA |
| C. | 51 mA |
| D. | 54 mA |
| Answer» E. | |