Download Question Bank Part1

GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
QUESTION BANK OF ANALOG ELECTRONICS (LAB)
1. Which of the following electronic devices operates by virtue of the movement of electrons within a
solid piece of semiconductor material?
1) Transistor
2) Junction diode
3) Solid-state device
4) Each of the above
2. Which of the following electronic devices is a minute piece of semiconductor material that can produce
complete electronic circuit functions?
1) Zener diode
2) Light-emitting
3) Integrated circuit
3. Which of the following terms is used for the decrease in resistance as the temperature of the
semiconductor increases?
1) Positive temperature coefficient
2) Negative temperature coefficient
3) Faraday temperature coefficient
4) Zero temperature coefficient
4. In addition to rectifying properties, selenium has the property of being light sensitive. How is
selenium's resistance affected by light?
1) It decreases with an increase in light intensity
2) It increases with an increase in light intensity
3) It remains constant with variation in light intensity
4) It increases regardless of the variation in light intensity
5. One of the most sensitive elements of semiconductor materials is galena. Galena is a crystalline form of
what material?
1) Krypton
2) Bismuth
3) Field effect transistor
4) Strontium
6. What significant discovery caused a breakthrough in the development of semiconductor devices?
1) The junction diode
2) The junction barrier
3) The extrinsic semiconductor
4) The point-contact transistor
7. Which of the following devices is frequently used to regulate power supply voltages at precise levels?
1) Junction diode
2) Tunnel diode
3) Esaki diode
4) Zener diode
8. Which of the following solid-state devices has both gain and fast-switching capabilities
1) Zener diode
2) Tunnel diode
3) Junction diode
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
4) Point-contact diode
9. Which of the following advantages, if any, does a conventional electron tube have over a
semiconductor device?
1) It is more efficient
2) It has a longer life
3) It is more economical
4) None of the above
10. Which of the following electronic devices operates by virtue of the movement of electrons within a
solid piece of semiconductor material?
1) Transistor
2) Junction diode
3) Solid-state device
4) Each of the above
11. Which of the following electronic devices is a minute piece of semiconductor material that can
produce complete electronic circuit functions
1) Zener diode
2) Light-emitting diode
3) Integrated circuit
4) Field effect transistor
12. Which of the following terms is used for the decrease in resistance as the temperature of the
semiconductor increases?
1) Positive temperature coefficient
2) Negative temperature coefficient
3) Faraday temperature coefficient
4) Zero temperature coefficient
13. In addition to rectifying properties, selenium has the property of being light sensitive. How is
selenium's resistance affected by light?
1) It decreases with an increase in light intensity
2) It increases with an increase in light intensity
3) It remains constant with variation in light intensity
4) It increases regardless of the variation in light intensity
14. What term is used for a semiconductor that has three or more elements?
1) Diode
2) Transistor
3) Duo-diode
4) Point contact
15. The term transistor was derived from which of the following words?
1) Resistance and capacitance
2) Transformer and
3) Resistor and transformer
4) Transfer and resistor
16. What are the three elements of a transistor?
1) Anode, base, and collector
2) Cathode, base, and collector
3) Emitter, collector, and base
4) Collector, emitter, and cathode
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
17. In a transistor, the flow of current carriers is controlled by which element(s)?
1) Emitter
2) Collector
3) Both 1 and 2 above
4) Base
18. In a transistor schematic, what is indicated by (a) the angular line with the arrowhead and (b) the
direction of the arrow?
1) (a) (b) Cathode Direction of current flow
2) (a) (b) Base Direction of current flow
3) (a) (b) Emitter Type of transistor
4) (a) (b) Collector Type of transistor
19. Junction transistors have replaced point- contact transistors for which of the following reasons?
1) Junction transistors generate less noise
2) Junction transistors handle more power
3) Junction transistors provide higher current and voltage gains
4) All of the above
20. What is the total number of PN junctions in a transistor?
1) One
2) Two
3) Three
4) Four
21. What are the two junctions of a transistor?
1) Emitter-base and emitter-collector
2) Emitter-collector and base-collector
3) Emitter-base and collector-emitter
4) Emitter-base and base-collector
22. With proper bias applied to a transistor, what should be the relative resistance of (a) the emitter-base
junction and (b) the base-collector junction?
1) (a) High (b) low
2) (a) High (b) high
3) (a) Low (b) low
4) (a) Low (b) high
23. For normal operation of a transistor, what is the bias of the (a) emitter-base junction and (b) basecollector junction?
1) (a) Forward (b) reverse
2) (a) Forward (b) forward
3)
(a) Reverse (b) forward
3) (a) Reverse (b) reverse
24. What is the total number of connections in a diode?
1) One
2) Two
3) Three
4) Four
25. When the PN-junction diode is reversed biased, what happens to the majority carriers?
1) They combine with minority carriers at the junction
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
2) They move toward the junction
3) Both 1 and 2 above
4) They move away from the junction
26. What causes a small leakage current in a reverse-biased PN junction?
1) Holes
2) Electrons
3) Minority carriers
4) Majority carriers
27. At some potential, as you increase the reverse bias voltage on a PN junction, the reverse current
increases very rapidly. What electronic term is given to this voltage potential?
1) Breakdown voltage
2) Reverse-bias
3) Forward-bias
4) Thermal runaway.
28. Which of the following is a characteristic of the Zener diode?
1) A PN-junction diode that operates in the reverse-bias breakdown region
2) A PN junction diode that uses the avalanche effect
3) A PN-junction diode that uses the Zener effect
4) Each of the above
29. What determines whether a solid material will act as a conductor, a semiconductor, or an insulator?
1) The energy level of the valence band
2) The energy level of the conductor band
3) The energy difference across the forbidden gap
4) The actual construction of the valence electrons
30. What is the "tunneling phenomenon" within the Zener diode?
1) An action where the minority carriers tunnel across the junction to form the current that occurs at
2) An action where the majority carriers tunnel across the junction to form the current that occurs at
breakdown
3) An action that separates the conduction band and the valence band by a large
4) An action that removes all the electrons from the conduction band energy level
31 Which breakdown theory explains the action that takes place in a heavily doped PN junction with a
reverse bias above 5 volts?
1) Zener effect
2) Avalanche breakdown
3) Energy band effect
4) Valence band gap crossing
32.If a P-type material is used to construct the gate of a JFET, what material should be used to construct the
remaining part of the JFET?
1) N-type
2) P-type
3) Mica type
4) Junction type
33. What is the key to FET operation?
1) The control of the effective cross- sectional area of the channel
2) The control of the effective cross- sectional area of the gate
3) Both 1 and 2 above
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
4) The low input impedance compared with the high output impedance
34. When reverse bias is applied to the gate lead of a JFET, what happens to (a) source-to-drain
resistance of the device and (b) current flow?
1) (a) Decreases (b) decreases
2) (a) Decreases (b) increases
3) (a) Increases (b) decreases
4) (a) Increases (b) increases
35. What is the "pinch off" voltage of an FET?
1) The voltage required for the FET to conduct
2) The voltage required to overcome the FET reverse bias
3) The voltage required to reduce drain current to zero
4) The voltage required to reduce gate voltage to zero
36. What type of transistor is shown in figure 3-G?
1) N channel JFET
2) P channel JFET
3) NPN/channel JFET
4) PNP/channel JFET
37. The MOSFET is normally constructed so that it operates in either the depletion mode or the
enhancement mode. The depletion mode MOSFET (a) uses what type of bias and (b) has what type of
doped channel to cause a depletion of current carriers in the channel?
1) (a) Reverse (b) lightly
2) (a) Forward (b) lightly
3) (a) Reverse (b) heavily
4) (a) Forward (b) heavily
38. The enhancement mode MOSFET (a) uses what type of bias and (b) has what type of doped channel
to enhance the current carriers in the channel?
1) (a) Reverse (b) lightly
2) (a) Forward (b) lightly
3) (a) Reverse (b) heavily
4) (a) Forward (b) heavily
39. Which coupling gives the higher gain in case of amplifier: a) Capacitor coupling
b) Impedance coupling
c) Transformer coupling
40. Which distortion is least objectionable in audio amplification: a) Phase
b) Frequency
c) Harmonic
d) Intermediation
41. Transistor is a following operated device: a) Low voltage & low current device
b) Low voltage & high current device
c) Low current & high voltage device
d) High current & high voltage device
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
42. A differential amplifier amplifies the ---------- between two input signals.
a) addition
b) subtraction
c) multiplication
43. Noise of input signal in differential amplifier
a) increases
b) decreases
c) remains the soul
44. Cascaded differential amplifier requires level translator because of
a) impedance matching
b) isolating each stage
c) d.c.shift.
45. In case of constant current bias ,R1 is replaced by diodes D1 & D2 to
a) increase the input impedance
b) improve thermal stability
c) increase gain
46. If CMRR is high ,the wide variation of input within the tolerable limits of the equipment makes output
a) high
b) low
c) the same
47. A single supply operational amplifier is
a) LM 318
b) MC 414
c) LM 324
48. The cascode amplifier is composed of direct coupled
a) CE-CB configuration
b) CC-CC configuration
c) CC-CB configuration
49. Input bias current is always is ________ than input offset current
a) greater
b) equal
c) less
50. If input frequency is exceed the slew rate the output will be
a) distorted
b) not distorted
c) amplified
51. The operational amplifier can be nulled by _________.
a) using an offset voltage compensating network
b) using an error minimizing resistance
c) cutting off the power supplies
52. Open loop configuration of operational amplifier is not need for
a) linear operation
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT
GURU TEGH BAHADUR INSTITUTE OF TECHNOLOGY
b) nonlinear operation
c) none of above
53. Slew rate is defined by________
a) dv/dt(max)
b) di/dt(max
c) none of the above
54. The slew rate has _______
a) positive temperature coefficient
b) negative temperature coefficient
c) none of the above
55. Operational amplifier offset voltage due to input bias circuit can be significantly reduced if we use
a) offset compensatory network
b) offset minimizing resistance
56. The standard supply voltage for an ordinary operational amplifier is
a) 15 volts
b) 13 volts
c) 12 volts
57. The input offset voltage _______ with negative feedback .
a) increases
b) decreases
c) does not change
58. Specified value of CMRR for 741 opamp is ________.
a) 30 dB
b) 40 dB
c) 90 dB
59. 741 opamp is a chip of type _________.
a) industrial
b) military
c) commercial
60. Voltage follower is a special case of __________.
a) inverting configuration
b) non-inverting configuration
c) difference configuration
COMPILED BY:Mukesh Sahu,Dilpreet Badwal,Vidisha
Khetarpal,Raman,Amrish,Shivani,Pawan
Lecturers,ECE Dept.,GTBIT