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