Exercise: Electronic Devices And Circuits

Questions for: Electronic Devices And Circuits

The dipole moment per unit volume as a function of E in the case of an insulator is given by (symbols have the usual meaning).
A:
P = Îĩ0E (Îĩr - E)
B:
P = Îĩ0E
C:
P =
D:
P =
Answer: A
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Semiconductors have
A:
aero temperature coefficient of resistance
B:
positive temperature coefficient of resistance
C:
negative temperature coefficient of resistance
D:
none of the above
Answer: C
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For an insulating material, dielectric strength and dielectric loss should be respectively
A:
high and high
B:
low and high
C:
high and low
D:
low and low
Answer: C
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With an ac input from 50 Hz power line, the ripple frequency is
A:
50 Hz in the dc output of half wave as well as full wave rectifier
B:
100 Hz in the dc output of half wave as well as full wave rectifier
C:
50 Hz in the dc output of half wave and 100 Hz in the dc output of full wave
D:
100 Hz in the dc output of half wave and 50 Hz in the dc output of full wave
Answer: C
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The turn on time of an SCR is 5 micro second. Its trigger pulse should have
A:
short rise time with pulse width = 2.5 Ξs
B:
long rise time with pulse width = 3 Ξs
C:
short rise time with pulse width = 4 Ξs
D:
long rise time with pulse width = 4 Ξs
Answer: C
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