Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

Which one of the following circuits is most suitable as an oscillator at a frequency of 100Hz?
A:
Hartley oscillator
B:
Colpitts oscillator
C:
Crystal oscillator
D:
Twin-T oscillator
Answer: A
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In ferromagnetic materials
A:
the atomic magnetic moments are antiparallel and unequal
B:
the atomic magnetic moments are parallel
C:
the constituent is iron only
D:
one of the constituents is iron
Answer: B
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Assertion (A): Tunnel diode is used in many pulse and digital circuits.

Reason (R): The v-i curve of a tunnel diode resembles letter 'N'.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not a correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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Assertion (A): In CE connection of n-p-n transistor. VCE is positive.

Reason (R): In BJT, the base collector junction is reverse biased.

A:
Both A and R are true and R is correct explanation of A
B:
Both A and R are true but R is not a correct explanation of A
C:
A is true but R is false
D:
A is false but R is true
Answer: A
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The impurity commonly used for realizing the base region of a n-p-n transistor is
A:
gallium
B:
indium
C:
boron
D:
phosphorus
Answer: C
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