MCQOPTIONS
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MCQOPTIONS
This section includes 48 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
An 8 bit unipolar successive approximation register type ADC is used to convert 3.5V to digital equal output. The reference voltage is +5V. The output of ADC at end of 3rd clock pulse after the start of conversion is .......... . |
| A. | 1010 0000 |
| B. | 1000 0000 |
| C. | 0000 0001 |
| D. | 0000 0011 |
| Answer» B. 1000 0000 | |
| 2. |
A 41 / 2 digit DMM has the error specification as: 0.2% of reading +10 counts. If a dc voltage of 100 V is read on its 200 V full scale, the maximum error that can be expected in the reading is |
| A. | 0.1% |
| B. | 0.2% |
| C. | 0.3% |
| D. | 0.4% |
| Answer» D. 0.4% | |
| 3. |
Two 8-bit ADCs, one of single slope integrating type and other of successive approximation type, take TA and TB times to convert 5 V analog input signal to equivalent digital output. If the input analog signal is reduced to 2.5V, the approximate time taken by the two ADCs will respectively, be
|
| A. | T |
| B. | , T |
| Answer» B. , T | |
| 4. |
For a class B amplifier providing a 20 V peak signal to 16Ω load and a power supply of Vcc = 30 V, efficiency will be _____ % . |
| A. | 52.3 |
| B. | 22.3 |
| C. | 52 |
| D. | 32.33 |
| Answer» B. 22.3 | |
| 5. |
If input signal ei applied to the OP-AMP of the circuit shown in the given figure is sinusoidal at maximum value 1 mV and of 1kHz frequency, then magnitude of the peak value of the output voltage waveform would be _________ mV . |
| A. | 628 |
| B. | 28 |
| C. | 68 |
| D. | 128 |
| Answer» B. 28 | |
| 6. |
Of the four characteristic given below, what are major requirements for an instrument amplifier?
|
| A. | P, Q & R only |
| B. | P & R only |
| C. | P, Q & S only |
| D. | Q, R & S only |
| Answer» B. P & R only | |
| 7. |
feedback were at 60 Hz, then with feedback it would become _________ kHz . |
||||
| A. | 360 | ||||
| B. | 40 | ||||
| C. | 160 | ||||
| D. | 180 | ||||
| Answer» B. 40 | |||||
| 8. |
For a transistor, parameters are = 180 and VA = 150V, and it is biassed at ICQ = 2m A. If collector of the tansistor is connected to the base terminal, t hen small signal resistaance re = vce/ ic of this two-terminal device is ____ Ω . |
| A. | 4.32 |
| B. | 6.43 |
| C. | 12.87 |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
A CE amplifier has a resistor RF connected between collector an d base RF = 40 k. RC = 4k. I f hfe = 50, r = 1 k, then output resistance R0 is _______ kΩ . |
| A. | 33 |
| B. | 0.66 |
| C. | 6.6 |
| D. | 3.3 |
| Answer» C. 6.6 | |
| 10. |
If = 0.98, ICO = 6 A and I = 100 A for a transistor, then value of IC will be _______ mA |
| A. | 15.2 |
| B. | 5.2 |
| C. | 2.2 |
| D. | 8.4 |
| Answer» C. 2.2 | |
| 11. |
For the circuit of the given figure with an ideal operational amplifier, maximum phase shift of the output Vout with reference to the input Vin is |
| A. | 0 |
| B. | 90 |
| C. | + 90 |
| D. | + 180 |
| Answer» E. | |
| 12. |
An op-amp is open-loop gain of 105 and open-loop upper cut-off frequency of 10 Hz. If this OP-AMP is connected as an amplifier with a closed-loop gain at 100, then new uper cut-off frequency will be |
| A. | 10 Hz |
| B. | 100 Hz |
| C. | 10 kHz |
| D. | 100 kHz |
| Answer» D. 100 kHz | |
| 13. |
Output voltage of an OP-AMP for input voltage of Vi1 = 150 V, Vi22 = 140 V if amplifier has a differential gain of Ad = 4000 and value of CMRR is 100, is |
| A. | 45.8 mV |
| B. | 40.006 mV |
| C. | 10 V |
| D. | 145 V |
| Answer» B. 40.006 mV | |
| 14. |
OPAMP used as a tuned amplifier has the tuned circuit connected |
| A. | across input |
| B. | across series impedance at the input |
| C. | across feedback impedance Z |
| D. | |
| E. | across output |
| Answer» D. | |
| 15. |
An amplifier has an open loop gain of 100, an input impedance of 1kΩ, and an out put impedance of 100 Ω. If a feedback network with a feedback factor of 0.99 is connected in a voltage series feedback mode then new input and output impedances are
|
| A. | 10 Ω and 1 Ω |
| B. | 10 Ω and 10 k Ω |
| C. | 100 k Ω and 1 Ω |
| D. | 100 kΩ 10 k Ω |
| Answer» D. 100 kΩ 10 k Ω | |
| 16. |
A junction transistor operating at room temperature with IC = 2 mA, where (kT / q) = 20 mV and = 100. The values of parameter gm in mhos and r in ohm respectively are |
| A. | 0.04 and 2500 |
| B. | 0.08 and 1250 |
| C. | 0.5 and 800 |
| D. | 0.08 and 5000 |
| Answer» C. 0.5 and 800 | |
| 17. |
If an npn transistor (with C = 0.3 pF) has a unity gain cut-off frequency fT of 400 MHz at a d.c. bias current Ic = 1 mA, then value of its C is approximately (VT = 26 mV) |
| A. | 15 |
| B. | 30 |
| C. | 50 |
| D. | 96 |
| Answer» B. 30 | |
| 18. |
If an npn transistor has a beta cut-off frequency fB of 1MHz, and emitter short circuit low frequency current gain 0 of 200, then unity gain frequency fT and alpha cut off frequency f respectively are |
| A. | 200 MHz, 201 MHz |
| B. | 200 MHz, 199 MHz |
| C. | 199 MHz, 200 MHz |
| D. | 201 MHz, 200 MHz |
| Answer» B. 200 MHz, 199 MHz | |
| 19. |
In an FET as VGS is changed from zero to increasing reverse bias, the value of gm |
| A. | increased |
| B. | decreased |
| C. | remains constant |
| D. | falls suddenly to zero |
| Answer» C. remains constant | |
| 20. |
For a class B amplifier providing a 20 V peak signal to 16Ω load and a power supply of V |
| A. | 52.3 |
| B. | 22.3 |
| C. | 52 |
| D. | 32.33 |
| Answer» B. 22.3 | |
| 21. |
A(0 50A) moving coil ammet er has a volt age dr op of 0.1V across its terminals at full scale deflection. The external shunt resistance (in milliohms) needed to extend its range to (0 500A) is ______. |
| A. | 0.22 to 0.23 |
| B. | 0.21 |
| C. | 0.13 |
| D. | 0.21 to 0.22 |
| Answer» B. 0.21 | |
| 22. |
Output voltage of an OP-AMP for input voltage of V |
| A. | 45.8 mV |
| B. | 40.006 mV |
| C. | 10 V |
| D. | 145 V |
| Answer» B. 40.006 mV | |
| 23. |
A CE amplifier has a resistor R |
| A. | 33 |
| B. | 0.66 |
| C. | 6.6 |
| D. | 3.3 |
| Answer» C. 6.6 | |
| 24. |
If = 0.98, I |
| A. | 15.2 |
| B. | 5.2 |
| C. | 2.2 |
| D. | 8.4 |
| Answer» C. 2.2 | |
| 25. |
|
||||
| A. | 360 | ||||
| B. | 40 | ||||
| C. | 160 | ||||
| D. | 180 | ||||
| Answer» B. 40 | |||||
| 26. |
A constant current signal across a parallel RLC circuit gives an output of 1.4 volts at the signal frequency of 3.89 k Hz and 4.1 kHz. At frequency of 4k Hz, out put voltage will be __________ V |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 27. |
When a bipolar junction transistor is operating in the saturation mode, which one of the following statement is TRUE about the state of its collectorbase (CB) and the base-emitter (BE) junctions? |
| A. | The CB junction is forward biased and the BE junction is reverse biased. |
| B. | The CB junction is reversed and t he BE junction is forward biased. |
| C. | Both the CB and BE junctions are forward biased. |
| D. | Both the CB and BE junctions are reverse biased. |
| Answer» D. Both the CB and BE junctions are reverse biased. | |
| 28. |
An 8 bit unipolar successive approximation register type ADC is used to convert 3.5V to digital equal output. The reference voltage is +5V. The output of ADC at end of 3 |
| A. | 1010 0000 |
| B. | 1000 0000 |
| C. | 0000 0001 |
| D. | 0000 0011 |
| Answer» B. 1000 0000 | |
| 29. |
If an amplifier with gain of 1000 and feedback of b = 0.1 had a gain change of 20% due to temperature, then change in gain of the feedback amplifier would be __________ % . |
| A. | 0.002% |
| B. | 0.2% |
| C. | 2% |
| D. | 2.2% |
| Answer» C. 2% | |
| 30. |
For a transistor, parameters are = 180 and V |
| A. | 4.32 |
| B. | 6.43 |
| C. | 12.87 |
| D. | None of the above |
| Answer» D. None of the above | |
| 31. |
An op-amp, having a slew rate of 62.8 V/msec, is connected in a voltage follower configuration. If maximum amplitude of the input sinusoid is 10 V, then minimum frequency at which slew rate limited distortion would set in at the output is _________ MHz |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 32. |
Of the four characteristic given below, what are major requirements for an instrument amplifier? |
| A. | P, Q & R only |
| B. | P & R only |
| C. | P, Q & S only |
| D. | Q, R & S only |
| Answer» B. P & R only | |
| 33. |
If input signal e |
| A. | 628 |
| B. | 28 |
| C. | 68 |
| D. | 128 |
| Answer» B. 28 | |
| 34. |
For the circuit of the given figure with an ideal operational amplifier, maximum phase shift of the output V |
| A. | 0 |
| B. | 90 |
| C. | + 90 |
| D. | + 180 |
| Answer» E. | |
| 35. |
An op-amp is open-loop gain of 10 |
| A. | 10 Hz |
| B. | 100 Hz |
| C. | 10 kHz |
| D. | 100 kHz |
| Answer» D. 100 kHz | |
| 36. |
If differential amplifier has a differential gain of 20,000. CMRR = 80 dB, then common mode gain is |
| A. | 2 |
| B. | 1 |
| C. | 1 / 2 |
| D. | 0 |
| Answer» B. 1 | |
| 37. |
In a common emitter amplifier, the unbypassed emitter resistance provides |
| A. | voltage-shunt feedback |
| B. | current-series feedback |
| C. | negative-voltage feedback |
| D. | positive-current feedback |
| Answer» D. positive-current feedback | |
| 38. |
If an amplifier with resistive negative feedback has two left half planes poles in its open-loop transfer function then amplifier |
| A. | will always be unstable at high frequencies. |
| B. | will be stable for all frequncies. |
| C. | may be unstable, depending upon the feedback factor. |
| D. | will oscillate at low frequencies. |
| Answer» C. may be unstable, depending upon the feedback factor. | |
| 39. |
An amplifier has an open loop gain of 100, an input impedance of 1kΩ, and an out put impedance of 100 Ω. If a feedback network with a feedback factor of 0.99 is connected in a voltage series feedback mode then new input and output impedances are |
| A. | 10 Ω and 1 Ω |
| B. | 10 Ω and 10 k Ω |
| C. | 100 k Ω and 1 Ω |
| D. | 100 kΩ 10 k Ω |
| Answer» D. 100 kΩ 10 k Ω | |
| 40. |
A junction transistor operating at room temperature with I |
| A. | 0.04 and 2500 |
| B. | 0.08 and 1250 |
| C. | 0.5 and 800 |
| D. | 0.08 and 5000 |
| Answer» C. 0.5 and 800 | |
| 41. |
A signal may have frequency components which lie in the range of 0.001 Hz to 10Hz. which of the following types of coupling should be chosen in a multistage amplifier designed to amplify this signal ? |
| A. | RC coupling |
| B. | Transformer coupling |
| C. | Direct coupling |
| D. | Double-tuned coupling |
| Answer» D. Double-tuned coupling | |
| 42. |
If a two-stage amplifier is required to have an upper cut-off frequency of 2 MHz and a lower cut-off frequency of 30 Hz then upper and lower cut -off frequencies of individual st age are respectively |
| A. | 4 MHz, 60 Hz |
| B. | 3 MHz, 20 Hz |
| C. | 3 MHz, 60 Hz |
| D. | 4 MHz, 20 Hz |
| Answer» C. 3 MHz, 60 Hz | |
| 43. |
If an npn transistor (with C = 0.3 pF) has a unity gain cut-off frequency f |
| A. | 15 |
| B. | 30 |
| C. | 50 |
| D. | 96 |
| Answer» B. 30 | |
| 44. |
If an npn transistor has a beta cut-off frequency f |
| A. | 200 MHz, 201 MHz |
| B. | 200 MHz, 199 MHz |
| C. | 199 MHz, 200 MHz |
| D. | 201 MHz, 200 MHz |
| Answer» B. 200 MHz, 199 MHz | |
| 45. |
The gain bandwidth product of a two stage CE amplifier is |
| A. | same as that of one stage |
| B. | greater than that of one stage |
| C. | less than that of one stage |
| D. | product of the two gain bandwidth products of each stage |
| Answer» B. greater than that of one stage | |
| 46. |
In an FET as V |
| A. | increased |
| B. | decreased |
| C. | remains constant |
| D. | falls suddenly to zero |
| Answer» C. remains constant | |
| 47. |
The threshold voltage of an n-channel MOSFET can be increased by |
| A. | increasing channel doping concentration |
| B. | reducing channel length |
| C. | reducing gate oxide thickness |
| D. | decreasing channel doping concentration |
| Answer» C. reducing gate oxide thickness | |
| 48. |
The MOSFET swit ch in it s on-st at e may be considered equivalent to |
| A. | resistor |
| B. | inductor |
| C. | capacitor |
| D. | battery |
| Answer» D. battery | |