Multiple Choice Questions for Electronics Engineering Part 1
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Q.1 Just as a voltage amplifier signal voltage a power amplifier.
- amplifier power
- amplifier signal
- converts the signal ac power into DC power
- converts a dc power into useful AC power
Answer: 4
Q.2 Cross over distortion in class - B push-p amplifiers:
- Is due to transistor operating near saturation region
- Can be eliminated by operating them in class operation
- Occurs because two power transistors do not exactly matching parameters
- Always occurs in low signal are
Answer: 2,4
Q.3 If the load p. f. is 0.866, then the average p. f. the v-bank is
- 0.886
- 0.75
- 0.51
- 0.65
Answer: 2
Q.4 AT-T connection has higher ratio of utilization that n a V – V connection only when
- Identical transformers are used
- Load power factor is leading
- Load power factor is unity
- Non-identical transformers are used
Answer: 4
Q.5 A commercial power supply has a voltage regulation of:
- 1%
- 5%
- 20%
- 50%
Answer: 1
Q.6 Which stage is of a d. c. power supply uses zener diode
- Rectifier
- Voltage divider
- Filter
- Regulator
Answer: 4
Q.7 Which rectifier requires 4 diodes?
- half wave rectifier
- full wave rectifier
- bridge type rectifier
- Voltage quadrupler
Answer: 3
Q.8 The advantage of dynamic RAMs over static RAMs is
- Lower power consumption
- Higher power consumption
- Higher packing density
- Lower packing density
Answer: 1,3
Q.9 The address range for M = 64 words storage in hexadecimal format is
- 00 to 3F
- 00 to FF
- 0 to 3
- 0 to F
Answer: 1
Q.10 The 8085 is a – microprocessor
- 4 bit
- 8 bit
- 16 bit
- 32 bit
Answer: 2
Q.11 The voltage gain of a common base amplifier depends on
- Load resistor RL
- Input resistance of transistor
- Ac alpha
- All the above
Answer: 4
Q. 12 A JFET has the disadvantage of
- Having low input impedance
- Having high input impedance
- Having small gain band-width product
- Possessing positive temperature coefficient
Answer: 3
Q.13 A FET is preferred over an ordinary transistor because it
- Permits high degree of isolation
- Has low noise level
- Has very high power gain
- Has all the above properties
Answer: 4
Q.14 To turn a UJT ON, the forward bias on emitter diode should be:
- more than the peak point voltage
- less than the peak point voltage
- Equal to the peak point voltage
- Equal to the stand – off voltage
Answer: 1
Q.15 Which of the following statements is wrong for transistor biasing methods:
- The base resister method does not provide stabilization of operating point
- The biasing with feedback resistor provides only some stabilization
- Base resistor method provides better stabilization than collector feedback method
- Voltage divider bias is widely used because it has stable operating point
Answer: 3
Q.16 The disadvantage of voltage divider bias is that
- It has a high stability factor
- It has many resistors
- It allows thermal runway
- It does not allow faithful amplification
Answer: 2
Q.17 In class-A amplifies conduction extends over 360 because the operating point.
- Located near saturation point
- Located at or near cut0off point
- Located on load line
- Located in the centre of load line
Answer: 4
Q.18 The capacitance of reverse biased P-N junction
- Decreases with increasing the reverse bias
- Increases with increasing the reverse bias
- Depends only on reverse saturation current
- Makes the P-N junction more effective at high frequencies
Answer: 1