Electrical Engineering MCQs

Page No. 32

For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than_____________?


a10 IB

✓


b 3 IB

✖


c2 IB

✖


d4 IB

✖


View Answer 10 IB

The disadvantage of base resistor method of transistor biasing is that it_________________?


aIs complicated

✖


bIs sensitive to changes in ß

✓


c Provides high stability

✖


d None of the above

✖



An ideal value of stability factor is________________?


a100

✖


b200

✓


cMore than 200

✖


d1

✖


View Answer 200

The leakage current in a silicon transistor is about_____________ the leakage current in a germanium transistor?


aOne hundredth

✖


bOne tenth

✖


cOne thousandth

✓


d One millionth

✖


View Answer One thousandth

The biasing circuit has a stability factor of 50. If due to temperature change, ICBO changes by 1 µA, then IC will change by___________________?


a100 µA

✖


b25 µA

✖


c20 µA

✖


d 50 µA

✓


View Answer 50 µA

If the maximum collector current due to signal alone is 3 mA, then zero signal collector current should be at least equal to___________________?


a6 mA

✖


bmA

✖


c3 mA

✓


d1 mA

✖


View Answer 3 mA

The circuit that provides the best stabilization of operating point is___________________?


a Base resistor bias

✖


b Collector feedback bias

✖


cPotential divider bias

✖


dNone of the above

✓


View Answer None of the above

Transistor biasing is generally provided by a_______________?


aBiasing circuit

✓


bBias battery

✖


cDiode

✖


dNone of the above

✖


View Answer Biasing circuit

Transistor biasing is done to keep _____________in the circuit?


aProper direct current

✓


b Proper alternating current

✖


cThe base current small

✖


dCollector current small

✖


View Answer Proper direct current

For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?


aBe zero

✖


bBe 0.01 V

✖


cNot fall below 0.7 V

✓


dBe between 0 V and 0.1 V

✖


View Answer Not fall below 0.7 V

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