Basic Electronics

#1. The barrier potential of a silicon transistor is...?

0.3 V

0.6 V

0.8 V

0.7 V

#2. For an NPN transistor, if the base emitter junction is in forward biased and base collector junction is reverse biased, then the mode of operation is called....?

cut off

forward active

reverse cu off

saturation

#3. The output of half wave rectifier is....?

DC

AC

pulsating DC

filtered DC

#4. A PN junction is a.....?

rectifier

inverter

oscillator

amplifier

#5. The temperature coefficient of intrinsic semiconductor is....?

zero

negative

positive

none of the above

#6. Which of the following material is a semi conductor?

copper

iron

selenium

silicon

#7. A semiconductor generally has ...... valence electrons?

2

3

4

5

#8. A 0 K, an intrinsic semi conductor behaves as a....?

insulator

conductor

super conductor

none of the above

#9. The process of adding impurities into pure semiconductor called....?

recombination

doping

electron hole pairs

none of the above

#10. The voltage where avalanche occurs is called.....?

barrier potential

cut in voltage

knee voltag

break down voltage

#11. The colour code of 1Kohm resistance is....?

brown black red

black brown red

red black brown

red brown black

#12. If the input supply frequency is 50 Hz, the output ripple frequency of a bridge rectifier is....?

100

75

50

25

#13. The PIV of a half wave rectifier circuit with a shunt capacitor filter is....?

2Vm

Vm

Vm/2

3Vm

#14. In the collector configuration, the collector characterisitics is used to find...?

base current

input current

output resistance

gain

#15. A BJT amplifier operates in the .... region?

active

cut off

saturation

none of these

#16. The maximum efficiency of a class A amplifier is .....%

25

50

75

80

#17. A bistable multi vibrator is a .... oscillator?

sine wave

free running

sawtooth

triggered

#18. Which one of them is not a semiconductor?

germanium

silicon

berlium

galium arsenide

#19. An SCR is a ..... layer device?

single

2

3

4

#20. The pottential difference across a PN junction is referred as.....?

break down pottential

pottential difference

reverse pottential

barrier pottential

#21. SCR is turn off by reducing...?

cathode voltage

gate voltage

holding current

load current

#22. Which of the following is to added to a intrinsic semiconductor to form P type semiconductor?

arsenic

boron

antimony

bismuth

#23. The diode used for voltage regulation is called....?

zener diode

rectifier diode

tunnel diode

signal diode

#24. The phenomenoa which causes reverse break down in zener diode is known as....?

hall effect

break down effect

avalanche effect

none of the above

#25. In a transistor, the width of collector layer is...?

much less than base region

much wider than base region

same as base region

less than emitter region

#26. In a transistor the ratio of Ic/Ib is called....?

power gain

voltage gain

total gain

current gain

#27. For a half wave rectifier the ripple factor is....?

1

1.21

0.48

1.45

#28. For a half wave rectified sine wave, the ripple factor is....?

1

1.21

0.48

1.45

#29. For n type semiconductor, the doping material is...?

tetravalent

pentavalent

trivalent

bivalent

#30. An inverter converts...?

ac to dc

dc to ac

ac to variable ac

dc to variable dc

#31. Current flow in semiconductor depends on the phenomenon...?

drift

diffusion

recombination

all the above

#32. The width of depletion layer of a PN jucnction...?

decrease with light doping

increase with heavy dopping

incrased under reverse bias

decreased under reverse bias

#33. The ratio of collector current to emitter current of a transistor is 0.99. What is the ratio of collector current to base current?

99

100

101

200

#34. What is the peak to peak voltage of 250V AC is.....?

500 V

707 V

353 V

424 V

#35. A full wave bridge rectifier uses ..... diodes?

1

2

3

4

#36. The heavily dopped region of bipolar junction transistor is....?

emitter

base

collector

none of these

#37. Electron volt is the unit of...?

power

energy

voltage

current

#38. When both higher voltage and higher current are required, cells may be joined in...?

series, parallel

parallel,series

series

parallel

#39. In a full wave rectifier, the peak inverse voltage per diode is....?

Vm

2Vm

Vm / 2

(2VM)1/2

#40. What is CDMA?

Code diversified multiple access

Code division multiple access

Code divergence multiplex access

Code direction multiple access

#41. Octal equivalent of decimal 51 is....?

63

41

67

69

#42. In a T flip flop, ratio of frequency of the input pulse to the frequency of out put pulse is....?

1

2

3

4

#43. The transistor amplifier stage has lowest input impedance in....?

CB

CC

CE

Same in all configurations

#44. The function of a filter in a rectifier is to....?

limit the total current in the rectifier

limit the peak voltage of the rectifier

limit the DC current

reduce the ripple voltage in the output

#45. Register that is used to hold the memory address of the next instruction to be executed....?

program memory

program counter

control unit

instruction decoder

Basic Electronics

#1. The barrier potential of a silicon transistor is...?

#2. For an NPN transistor, if the base emitter junction is in forward biased and base collector junction is reverse biased, then the mode of operation is called....?

#3. The output of half wave rectifier is....?

#4. A PN junction is a.....?

#5. The temperature coefficient of intrinsic semiconductor is....?

#6. Which of the following material is a semi conductor?

#7. A semiconductor generally has ...... valence electrons?

#8. A 0 K, an intrinsic semi conductor behaves as a....?

#9. The process of adding impurities into pure semiconductor called....?

#10. The voltage where avalanche occurs is called.....?

#11. The colour code of 1Kohm resistance is....?

#12. If the input supply frequency is 50 Hz, the output ripple frequency of a bridge rectifier is....?

#13. The PIV of a half wave rectifier circuit with a shunt capacitor filter is....?

#14. In the collector configuration, the collector characterisitics is used to find...?

#15. A BJT amplifier operates in the .... region?

#16. The maximum efficiency of a class A amplifier is .....%

#17. A bistable multi vibrator is a .... oscillator?

#18. Which one of them is not a semiconductor?

#19. An SCR is a ..... layer device?

#20. The pottential difference across a PN junction is referred as.....?

#21. SCR is turn off by reducing...?

#22. Which of the following is to added to a intrinsic semiconductor to form P type semiconductor?

#23. The diode used for voltage regulation is called....?

#24. The phenomenoa which causes reverse break down in zener diode is known as....?

#25. In a transistor, the width of collector layer is...?

#26. In a transistor the ratio of Ic/Ib is called....?

#27. For a half wave rectifier the ripple factor is....?

#28. For a half wave rectified sine wave, the ripple factor is....?

#29. For n type semiconductor, the doping material is...?

#30. An inverter converts...?

#31. Current flow in semiconductor depends on the phenomenon...?

#32. The width of depletion layer of a PN jucnction...?

#33. The ratio of collector current to emitter current of a transistor is 0.99. What is the ratio of collector current to base current?

#34. What is the peak to peak voltage of 250V AC is.....?

#35. A full wave bridge rectifier uses ..... diodes?

#36. The heavily dopped region of bipolar junction transistor is....?

#37. Electron volt is the unit of...?

#38. When both higher voltage and higher current are required, cells may be joined in...?

#39. In a full wave rectifier, the peak inverse voltage per diode is....?

#40. What is CDMA?

#41. Octal equivalent of decimal 51 is....?

#42. In a T flip flop, ratio of frequency of the input pulse to the frequency of out put pulse is....?

#43. The transistor amplifier stage has lowest input impedance in....?

#44. The function of a filter in a rectifier is to....?

#45. Register that is used to hold the memory address of the next instruction to be executed....?

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