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.
| 1801. |
For the circuit of the given figure, the output equation is |
| A. | Y = ABCD |
| B. | Y = AB + CD |
| C. | Y = A + BCD |
| D. | Y = ABC + D |
| Answer» C. Y = A + BCD | |
| 1802. |
For the ring oscillator shown in the figure, the propagation delay of each inverter is 100 pico sec. What is the fundamental frequency of the oscillator output __________ |
| A. | 10 MHz |
| B. | 100 MHz |
| C. | 1 GHz |
| D. | 2 GHz |
| Answer» E. | |
| 1803. |
The inputs A, B, C of the given figure are applied to a 3 input NOR gate. The output is |
| A. | HIGH from 4 to 0 |
| B. | LOW from 0 to 4 |
| C. | HIGH from 0 to 1 and LOW from 1 to 4 |
| D. | LOW from 0 to 2 and HIGH from 2 to 4 |
| Answer» D. LOW from 0 to 2 and HIGH from 2 to 4 | |
| 1804. |
In a P-N-P transistor, with normal bias |
| A. | the collector junction has negligible resistance |
| B. | only holes cross the collector junction |
| C. | the collector-base junction is reverse biased and the emitter base junction is forward biased |
| D. | only majority carriers cross the collector junction |
| Answer» D. only majority carriers cross the collector junction | |
| 1805. |
Sweep voltage generators, sweep current generators, multivibrators and blocking oscillators can be combined as |
| A. | negative resistance oscillators |
| B. | tuned base tuned collector oscillators |
| C. | relaxation oscillators |
| D. | L-C tuned oscillators |
| Answer» D. L-C tuned oscillators | |
| 1806. |
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. | |
| 1807. |
For an ideal noise free transistor amplifier the noise factor is |
| A. | zero |
| B. | zero dB |
| C. | 1 dB |
| D. | depends on other factors |
| Answer» C. 1 dB | |
| 1808. |
In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is |
| A. | 40 V |
| B. | 25.5 V |
| C. | 20 V |
| D. | 2.55 V |
| Answer» C. 20 V | |
| 1809. |
In the re model of a BJT amplifier, the ac resistance of diode at room temperature is about (IE is quiescent emitter current) |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1810. |
Symbol shown in figure represents a |
| A. | P-channel enhancement MOSFET |
| B. | N-channel DEMOSFET |
| C. | UJT with P-type base |
| D. | UJT with N-type base |
| Answer» B. N-channel DEMOSFET | |
| 1811. |
When narrow current pulses drive a high Q resonant circuit the voltage across the circuit looks like |
| A. | narrow pulses |
| B. | half sine wave |
| C. | almost sine wave |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 1812. |
The noise figure is |
| A. | 3 dB |
| B. | 6 dB |
| C. | 6.6 dB |
| D. | 12 dB |
| Answer» B. 6 dB | |
| 1813. |
In figure VCC = + 30 V, IC corresponding to Q point is 1 mA. If RC = 5 kΩ and RE = 5 kΩ, VCE corresponding to Q point is |
| A. | 30 V |
| B. | 20 V |
| C. | 25 V |
| D. | 5 V |
| Answer» C. 25 V | |
| 1814. |
Which of the following values represents the open loop gain of typical op-amp? |
| A. | 100 |
| B. | 10000 |
| C. | 100000 |
| D. | 1000000 |
| Answer» D. 1000000 | |
| 1815. |
A diode can have a very high forward resistance. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 1816. |
A cascade amplifier will have higher cut off frequency |
| A. | equal to that of single stage amplifier |
| B. | less than that of single stage amplifier |
| C. | more than that of single stage amplifier |
| D. | none of these |
| Answer» C. more than that of single stage amplifier | |
| 1817. |
The purpose of connecting a coupling capacitor in the output circuit of an amplifier is |
| A. | to increase voltage gain |
| B. | to increase collector current |
| C. | to block dc collector voltage |
| D. | all of the above |
| Answer» D. all of the above | |
| 1818. |
Assertion (A): In an op-amp the gain bandwidth product equals infinityReason (R): The change in open loop gain of an amplifier has almost no effect on closed loop gain |
| 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» C. A is correct R is wrong | |
| 1819. |
If ac resistance of diode is re, then In CE, BJT amplifier the input impedance is |
| A. | re |
| B. | β re |
| C. | re/β |
| D. | (βre)² |
| Answer» C. re/β | |
| 1820. |
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 must be the minimum gain of the oscillator to provide oscillations? |
| A. | 40 |
| B. | 60 |
| C. | 100 |
| D. | 130 |
| Answer» B. 60 | |
| 1821. |
Cross-over distortion behaviour is a characteristic of |
| A. | class A output stage |
| B. | class B output stage |
| C. | class AB output stage |
| D. | common base output stage |
| Answer» C. class AB output stage | |
| 1822. |
The ac collector current is nearly equal to |
| A. | ac base current |
| B. | ac signal current |
| C. | ac supply current |
| D. | ac emitter current |
| Answer» E. | |
| 1823. |
If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be |
| A. | 10% |
| B. | 5% |
| C. | 0.2% |
| D. | 0.01% |
| Answer» D. 0.01% | |
| 1824. |
A Colpitt's oscillator uses |
| A. | a tapped inductor |
| B. | an inductor and two capacitors |
| C. | both (a) and (b) |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 1825. |
Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum |
| A. | when the phase difference between the inputs is 0° |
| B. | when the phase difference between the inputs in 90° |
| C. | when the phase difference between the inputs is 180° |
| D. | when the phase difference between the inputs is 0 or 180° |
| Answer» D. when the phase difference between the inputs is 0 or 180° | |
| 1826. |
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 | |
| 1827. |
One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be |
| A. | sinusoidal |
| B. | full rectified sinusoidal |
| C. | half rectified sinusoidal |
| D. | square wave |
| Answer» E. | |
| 1828. |
The transistor of following figure in Si diode with a base current of 40 μA and ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then IEQ = |
| A. | 1800 μA |
| B. | 180 μA |
| C. | 2000 μA |
| D. | 3000 μA |
| Answer» B. 180 μA | |
| 1829. |
Which circuit is called swamped amplifier? |
| A. | CC |
| B. | CE |
| C. | CB |
| D. | Both (a) and (b) |
| Answer» B. CE | |
| 1830. |
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 | |
| 1831. |
The ripple factor of a power supply is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 1832. |
A half wave diode rectifier has a capacitance input filter. If input voltage is Vm sin ωt, PIV is |
| A. | Vm |
| B. | 2 Vm |
| C. | 3 Vm |
| D. | 4 Vm |
| Answer» C. 3 Vm | |
| 1833. |
In a CE amplifier, the collector resistance is 6 kΩ and load resistance is 3 kΩ. The ac load resistance is |
| A. | 9 kΩ |
| B. | 6 kΩ |
| C. | 3 kΩ |
| D. | 2 kΩ |
| Answer» E. | |
| 1834. |
With negative feedback the closed loop gain is always less than open loop gain. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1835. |
In figure the dc load line will meet the y and x axis respectively at |
| A. | 20 mA and 30 V |
| B. | 15 mA and 20 V |
| C. | 25 mA and 40 V |
| D. | 10 mA and 20 V |
| Answer» B. 15 mA and 20 V | |
| 1836. |
In figure if the transistor is cut off, the collector voltage is equal to |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 1837. |
Assuming VCE sat = 0.2 V and β = 50, the minimum base current (IB) required to drive the transistor in the given figure to saturation is |
| A. | 56 μA |
| B. | 140 μA |
| C. | 60 μA |
| D. | 3 μA |
| Answer» B. 140 μA | |
| 1838. |
If the changes in zener current in a voltage regulator circuit are too large, it can be corrected by using a |
| A. | emitter follower |
| B. | CE amplifier |
| C. | capacitor |
| D. | either (a) or (b) |
| Answer» B. CE amplifier | |
| 1839. |
Which of the following best represents the input impedance of an actual op-amp? |
| A. | 10 ohm |
| B. | 1 k ohm |
| C. | 1 M ohm |
| D. | 100 M ohm |
| Answer» D. 100 M ohm | |
| 1840. |
The PIV of a bridge rectifier is less than that of full wave rectifier with centre tapped transformer. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 1841. |
To bypass a 100 ohm emitter resistor at |
| A. | 10 μF |
| B. | 100 μF |
| C. | 1000 μF |
| D. | 1 μF |
| Answer» D. 1 μF | |
| 1842. |
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 | |
| 1843. |
An ideal op-amp requires |
| A. | zero input offset voltage |
| B. | low input offset voltage |
| C. | high input offset voltage |
| D. | infinite input offset voltage |
| Answer» B. low input offset voltage | |
| 1844. |
For an npn transistor connected as shown in the figure VBE = 0.7 volts. Given that reverse saturation current of the junction at room temperature 300K is 10¯¹³A, the emitter current. |
| A. | 30 mA |
| B. | 39 mA |
| C. | 49 mA |
| D. | 20 mA |
| Answer» D. 20 mA | |
| 1845. |
In a resistance loaded, RC coupled amplifier the d.c. component is blocked by |
| A. | Transistor |
| B. | CC |
| C. | RB |
| D. | RC |
| Answer» C. RB | |
| 1846. |
A multivibrator can be used as a |
| A. | cavity resonator |
| B. | harmonic generator |
| C. | wave form modifier |
| D. | any of the above |
| Answer» D. any of the above | |
| 1847. |
In order to protect a MOSFET against damage from any stray voltage at the gate |
| A. | grounding rings are provided |
| B. | terminals are shorted |
| C. | source terminal is earthed during transit |
| D. | none of these |
| Answer» D. none of these | |
| 1848. |
The Vo of the op-amp circuit shown in the given is |
| A. | 11 Vi |
| B. | 10 Vi |
| C. | Vi |
| D. | zero |
| Answer» E. | |
| 1849. |
Circuit shown in the figure is |
| A. | astable multivibrator |
| B. | monostable multivibrator |
| C. | VCO |
| D. | ramp Generator |
| Answer» B. monostable multivibrator | |
| 1850. |
The knee voltages in silicon and germanium diodes respectively are |
| A. | 0.3 V and 0.7 V |
| B. | 0.7 V and 0.3 V |
| C. | 0.7 V each |
| D. | 0.3 V each |
| Answer» C. 0.7 V each | |