Basic Electronics – Multiple Choice Questions & Answers (MCQ1)

The Answers to these questions have been provided towards the end:

Q1. A Transistor is a?

A. Current controlled voltage device

B. Current controlled current device

C. Voltage controlled current device

D. Voltage controlled voltage device

Q2. The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is called?

A. Zener breakdown

B. Breakdown by tunnelling

C. Avalanche breakdown

D. High voltage breakdown

Q3. In a JFET, at pinch-off voltage applied on the gate,

A. The drain current begins to decrease

B. The drain current becomes almost zero

C. The drain current is almost at saturation value

D. The drain-to-source voltage is close to zero volts

Q4. When a step-input is applied to an op-amp integrator, the output will be?

A. A sinusoidal wave

B. Rectangular wave

C. A ramp

D. A triangular wave with dc bias

Q5. For large values of V_DS, a FET behaves as?

A. Voltage controlled current source

B. Voltage controlled resistor

C. Current controlled resistor

D. Current controlled current source

Q6. In an intrinsic semiconductor, the fermi-level is?

A. Midway between conduction and valance band

B. Closer to the conduction band

C. Closer to the valance band

D. Within the valance band

Q7. A differential amplifier, amplifies?

A. The difference of voltages between the two input lines

B. And differentiates the sum of the two input waveforms

C. And differentiates the input waveforms on one line when the other line is grounded

D. And mathematically differentiates the average of the voltages on two input lines

Q8. Which of the following oscillators has stable resonance characteristics?

A. Hartley

B. Crystal

C. Colpitts

D. Wien bridge

Q9. Which gate, assumes the 1 state, if and only if the input does not take a 1 state?

A. NOT gate

B. NOR

C. Both A and B

D. AND gate

Q10. The Wien bridge oscillator can typically generate frequencies in the range of?

A. 1 kHz – 1 MHz

B. 1 MHz – 10 MHz

C. 10 MHz – 100 MHz

D. 100 MHz – 150 MHz

Q11. A phase shift oscillator uses?

A. Balanced bridge

B. Piezoelectric crystal

C. LC tuning

D. Variable frequency operation

Q12. A transistor is a?

A. Current controlled voltage device

B. Voltage controlled current device

C. Current controlled current device

D. Voltage controlled voltage device

Q13. In a JFET device, when V_DS is increased beyond the pinch of voltage, the drain current

A. Remains constant

B. Increases

C. Decreases

D. First decreases and then increases

Q14. A bistable multivibrator is a?

A. Crystal oscillator

B. Free running oscillator

C. Triggered oscillator

D. Saw tooth wave generator

Q15. What is the main advantage of the crystal oscillator output?

A. Variable frequency

B. Constant frequency

C. 50 Hz to 60 Hz

D. d.c

Q16. N-type silicon is obtained by?

A. Doping with tetravalent element

B. Doping with pentavalent element

C. Doping with trivalent element

D. Doping with a mixture of trivalent and tetravalent

Q17. When the temperature of a doped semiconductor is increased, its conductivity

A. Increases

B. Decreases

C. No change

D. Increases or decreases depending on whether it is p or n-type

Q18. A Zener diode

A. Has a negative resistance

B. Has a high forward voltage rating

C. Has a sharp breakdown at low reverse voltage

D. Useful as an amplifier

Related:Basic Electric Circuits Questions and Answers

Q19. A negative feedback in an amplifier

A. Increases the voltage gain

B. Reduces the voltage gain

C. Converts the amplifier into an oscillator

D. Doesn’t have an effect on the voltage gain

Q20. Field effect transistor has?

A. Large output impedance

B. Large input impedance

C. Large voltage gain

D. Large power gain

Answers:

Q1. B, Q2. C, Q3. C, Q4. C, Q5. A, Q6. B, Q7. A, Q8. B, Q9. C, Q10. A, Q11. A, Q12. C, Q13. A, Q14. C, Q15. B, Q16. B, Q17. A, Q18. C, Q19. B, Q20. B

You can also read:The Basics of Semiconductor Physics as the Foundation of Electronics