MCQOPTIONS
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MCQOPTIONS
This section includes 869 Mcqs, each offering curated multiple-choice questions to sharpen your BITSAT knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a regulator IC provides lower than input then the converter is known as ____. |
| A. | Boost |
| B. | Buffer |
| C. | Buck-Boost |
| D. | Buck |
| Answer» E. | |
| 2. |
Circuit used for production of delay is |
| A. | An astable multivibrator |
| B. | A bistable multivibrator |
| C. | A monostable multivibrator |
| D. | None of the above |
| Answer» D. None of the above | |
| 3. |
If a UJT has an internal resistance 2k ohm at RB1 and 1 k ohm at RB2, what is its intrinsic stand-off ratio? |
| A. | 0.67 |
| B. | 0.33 |
| C. | 0.5 |
| D. | 0.75 |
| Answer» B. 0.33 | |
| 4. |
An oscillator circuit which is meant for converting sine wave signal into square wave signal is called a |
| A. | Schmitt trigger |
| B. | blocking oscillator |
| C. | multivibrator |
| D. | Wein bridge oscillator |
| Answer» B. blocking oscillator | |
| 5. |
Conformal coating is done in PCB assemblies to |
| A. | Improve strength |
| B. | Protect electronics form Moisture and contamination |
| C. | Increase withstanding voltage |
| D. | Improve aesthetics |
| Answer» C. Increase withstanding voltage | |
| 6. |
For an NPN transistor, if the Base Emitter junction is in forward biased and Base collector junction is in reverse biased, the mode of operation is: |
| A. | Reverse cutoff |
| B. | Cutoff |
| C. | Saturation |
| D. | Forward active |
| Answer» E. | |
| 7. |
In a UJT, the emitter terminal is: |
| A. | Always of the N-Type |
| B. | P-type for an N bar |
| C. | Always of the P-Type |
| D. | of the N-Type for a P bar |
| Answer» D. of the N-Type for a P bar | |
| 8. |
In LED, light is emitted because |
| A. | Recombination of charge carrier takes place |
| B. | Diode gets heated up |
| C. | Light falling on the diode gets amplified |
| D. | Lights gets reflected due to lens action |
| Answer» B. Diode gets heated up | |
| 9. |
Class – B push – pull amplifiers have following type of prominent distortion |
| A. | Electromagnetic distortion |
| B. | Capacitive distortion |
| C. | Inductive distortion |
| D. | Crossover distortion |
| Answer» E. | |
| 10. |
Identify the Converter topologies from the figures given below: |
| A. | (i) Flyback converter (ii) Forward converter |
| B. | (i) Forward converter (ii) Flyback converter |
| C. | Both are Forward converters |
| D. | Both are Flyback converters |
| Answer» B. (i) Forward converter (ii) Flyback converter | |
| 11. |
Decreasing the gain in the given circuit can be achieved by |
| A. | Reducing the amplitude of the input voltage. |
| B. | Increasing the value of Rf |
| C. | Increasing the value of Ri |
| D. | Removing Rf |
| Answer» D. Removing Rf | |
| 12. |
An identical OP-AMP is supposed to have |
| A. | Infinite input impedance |
| B. | Zero output impedance |
| C. | Infinite bandwidth |
| D. | All the above |
| Answer» E. | |
| 13. |
Photodiodes operate at |
| A. | Forward bias |
| B. | Breakdown region |
| C. | Reverse bias |
| D. | Saturation region |
| Answer» D. Saturation region | |
| 14. |
In DIP of 555 IC, the pin number 2 is given for the: |
| A. | Output signal |
| B. | Input signal |
| C. | Reset signal |
| D. | Trigger signal |
| Answer» E. | |
| 15. |
CMRR for an Op-amp should be |
| A. | As large as possible |
| B. | Close to zero |
| C. | Close to unity |
| D. | As small as possible |
| Answer» B. Close to zero | |
| 16. |
Calculate the output voltage if R1 = R2 = R3 = 50 Ω, Rf = 1 kΩ, and V1 = V2 = V3 = 50 mV. |
| A. | -3.0 V |
| B. | 3.0 V |
| C. | 1.0 V |
| D. | -1 |
| Answer» B. 3.0 V | |
| 17. |
For any amplifier, the gain-bandwidth product is always |
| A. | Gain × Bandwidth = Constant |
| B. | Gain / Bandwidth = Constant |
| C. | Bandwidth / Gain = Constant |
| D. | None of the above |
| Answer» B. Gain / Bandwidth = Constant | |
| 18. |
Identify the device having the following forward and reverse bias characteristics. |
| A. | SCR |
| B. | DIAC |
| C. | Zener Diode |
| D. | FET |
| Answer» B. DIAC | |
| 19. |
A transistor has a typical value of β = 200, If the collector current is 15 mA, then base current will be |
| A. | 0.75 mA |
| B. | 0.3 mA |
| C. | 0.075 mA |
| D. | 7.35 mA |
| Answer» D. 7.35 mA | |
| 20. |
In the circuit of an Op-Amp as an integrator, the feedback circuit mainly contains a ______. |
| A. | Resistor |
| B. | Capacitor |
| C. | Diode |
| D. | Transistor |
| Answer» C. Diode | |
| 21. |
In an SCR, the latching current is __________ the holding current |
| A. | lower than |
| B. | higher than |
| C. | same as |
| D. | negative of |
| Answer» C. same as | |
| 22. |
For a transistor, β = 50. The voltage drop across 1 kΩ resistor which is connected in the collector circuit 1 V and VBB = 0.7 V. Find the base current for common emitter connection. |
| A. | 1 mA |
| B. | 20 μA |
| C. | 2 μA |
| D. | 200 μA |
| Answer» C. 2 μA | |
| 23. |
How are SMD components in bulk mounted on PCB? |
| A. | Using hot air blower |
| B. | Using soldering iron |
| C. | Using wave soldering machine |
| D. | Using soldering pot |
| Answer» D. Using soldering pot | |
| 24. |
In PCB, the conformal coating is done |
| A. | To protect it from moisture and chemical pollutants |
| B. | To provide mechanical strength |
| C. | To produce a better looking product |
| D. | To protect against increasing voltage |
| Answer» B. To provide mechanical strength | |
| 25. |
Consider a single stage tuned amplifier having 3dB bandwidth of 100KHz. Determine the bandwidth if two such single stage tuned amplifiers are cascaded: |
| A. | 100 KHz |
| B. | 10 KHz |
| C. | 41.4 KHz |
| D. | 64.3 KHz |
| Answer» E. | |
| 26. |
For the circuit shown, find the output voltage for an input voltage of -1 V. |
| A. | -11 V |
| B. | +11 V |
| C. | -10 V |
| D. | +10 V |
| Answer» C. -10 V | |
| 27. |
A certain pulse measures 10 ms and has a period of 50 ms. The duty cycle is |
| A. | 5% |
| B. | 10% |
| C. | 20% |
| D. | 50% |
| Answer» D. 50% | |
| 28. |
In SMD IC packages, the full form of DIP is: |
| A. | Direct In-line package |
| B. | Door In-line Package |
| C. | Dual In-line Package |
| D. | Direct Indirect Package |
| Answer» D. Direct Indirect Package | |
| 29. |
An OP-Amp is designed to amplify: |
| A. | AC voltage |
| B. | DC voltage |
| C. | Both AC and DC voltage |
| D. | Pulse signals only |
| Answer» D. Pulse signals only | |
| 30. |
Consider the following statements:When compared with a bridge rectifier, a centre-tapped full wave rectifier:i. Has larger transformer utilization factor.ii. Can be used for floating output terminals i.e. no input terminal is grounded.iii. Needs two diodes instead of four.iv. Needs diodes of a lower PIV rating.Which of the above statements are correct? |
| A. | i, and ii only |
| B. | i, ii, iii and iv |
| C. | iii only |
| D. | iii and iv only |
| Answer» D. iii and iv only | |
| 31. |
In an RC phase shift oscillator, the phase of the feedback voltage is shifted by ______ with a three stage RC phase shift network |
| A. | 0 degree |
| B. | 60 degree |
| C. | 90 degree |
| D. | 180 degree |
| Answer» E. | |
| 32. |
Common-collector amplifiers are mainly used as: |
| A. | voltage amplifiers |
| B. | buffers |
| C. | low input impedance circuits |
| D. | all of the above |
| Answer» C. low input impedance circuits | |
| 33. |
Ceramic rings are used as _______. |
| A. | Bonding agent |
| B. | Strong coupler |
| C. | Impedance regulator |
| D. | Insulator |
| Answer» E. | |
| 34. |
Overmodulation of transmitter signal is corrected by the adjustment of the __________. |
| A. | speech amplifier |
| B. | power amplifier |
| C. | RF oscillator |
| D. | frequency doubler |
| Answer» B. power amplifier | |
| 35. |
An opto-coupler provides _______ between the input circuit and output circuit. |
| A. | Isolation |
| B. | Induction |
| C. | Amplification |
| D. | Oscillation |
| Answer» B. Induction | |
| 36. |
A buck converter is used to: |
| A. | Exactly double the voltage |
| B. | Stabilize the voltage |
| C. | Step up the voltage |
| D. | Step down the voltage |
| Answer» E. | |
| 37. |
Identify the component shown in the image below: |
| A. | Darlington pair |
| B. | Cascode pair |
| C. | SCR |
| D. | DIAC |
| Answer» B. Cascode pair | |
| 38. |
How are the junctions biased in a transistor when operating in the saturation region? |
| A. | Emitter base junction reverse biased and base-collector junction forward biased |
| B. | Both the junctions forward biased |
| C. | Both the junctions reverse biased |
| D. | Emitter base junction forward biased and base-collector junction reverse biased |
| Answer» C. Both the junctions reverse biased | |
| 39. |
A power amplifier delivers 25 W ac power to a 4 Ω speaker load. If the dc input power is 40 W, what is the efficiency of the amplifier? |
| A. | 25.0% |
| B. | 50.0% |
| C. | 62.5% |
| D. | 75.0% |
| Answer» D. 75.0% | |
| 40. |
For normal operation of NPN transistor: |
| A. | Emitter Base Junction must be reverse biased and Base-collector junction must be forward biased |
| B. | Emitter Base Junction must be reverse biased and Base-collector junction must be reverse biased |
| C. | Emitter Base Junction must be forward biased and Base-collector junction must be forward biased |
| D. | Emitter-Base Junction must be forward biased and Base-collector junction must be reverse biased |
| Answer» E. | |
| 41. |
In an ideal inverting amplifier, the voltage gain |
| A. | can be adjusted as greater than one only |
| B. | can be adjusted as less than one only |
| C. | can be adjusted as equal to one only |
| D. | can be adjusted as greater than, equal to or less than one |
| Answer» C. can be adjusted as equal to one only | |
| 42. |
How many RC stages are used in the RC phase shift oscillators? |
| A. | Six |
| B. | Two |
| C. | Four |
| D. | Three |
| Answer» E. | |
| 43. |
Barkhausen criterion for oscillator stability is |
| A. | Aβ = 0 |
| B. | Aβ < 1 |
| C. | Aβ = 1 |
| D. | A = 1/sqrt(β) |
| Answer» D. A = 1/sqrt(β) | |
| 44. |
A semiconductor in its purest form is known as _______ |
| A. | Super conductor |
| B. | Extrinsic semiconductor |
| C. | Insulator |
| D. | Intrinsic semiconductor |
| Answer» E. | |
| 45. |
A differentiation circuit has a |
| A. | Very high time constant |
| B. | Very low time constant |
| C. | Infinite time constant |
| D. | Zero time constant |
| Answer» C. Infinite time constant | |
| 46. |
In an Op-Amp inverting amplifier, the pin 2 of 741 IC is at virtual ground. This statement is based on which law? |
| A. | Kirchhoff’s Voltage Law |
| B. | Kirchhoff’s Current Law |
| C. | Ohm’s Law |
| D. | Coulomb’s Law |
| Answer» B. Kirchhoff’s Current Law | |
| 47. |
For making an Oscillator, certain conditions are to be met in an amplifier :(a) −ve feedback(b) +ve feedback(c) Barkhausen criteria(d) Noise signalCode : |
| A. | (b), (d), (c) is correct |
| B. | (a), (d), (c) is correct |
| C. | (a), (c) is correct |
| D. | (b), (a), (c) is correct |
| Answer» B. (a), (d), (c) is correct | |
| 48. |
In two stages, Transistor TC coupling _____ |
| A. | creates isolation between the two stages |
| B. | blocks the AC between the two stages |
| C. | creates direct coupling between the two stages |
| D. | stops the AC and passes the DC |
| Answer» D. stops the AC and passes the DC | |
| 49. |
In which of the following, resistance will decreases when temperature is increased? |
| A. | Carbon |
| B. | Silicon |
| C. | Germanium |
| D. | All of the above |
| Answer» E. | |
| 50. |
A gain 10,000,000 times in power is expressed as _____ db |
| A. | 60 |
| B. | 80 |
| C. | 70 |
| D. | 120 |
| Answer» D. 120 | |