Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

For a NPN bipolar transistor, what is the main stream of current in the base region?
A:
Drift of holes
B:
Diffusion of holes
C:
Drift of electrons
D:
Diffusion of electrons
Answer: B
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In a half wave rectifier, the load current flows
A:
only for the positive half cycle of the input signal
B:
only for the negative half cycle of the input signal
C:
for full cycle
D:
for less than fourth cycle
Answer: A
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In a semi-conductor diode, the barrier offers opposition to
A:
holes in P-region only
B:
free electrons in N-region only
C:
majority carriers in both regions
D:
majority as well as minority carriers in both regions
Answer: C
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What is the necessary a.c. input power from the transformer secondary used in a half wave rectifier to deliver 500 W of d.c. power to the load?
A:
1232 W
B:
848 W
C:
616 W
D:
308 W
Answer: A
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An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased
A:
the number of free electrons increases
B:
the number of free electrons increases but the number of holes decreases
C:
the number of free electrons and holes increase by the same amount
D:
the number of free electrons and holes increase but not by the same amount
Answer: C
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