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WorksheetsElectron devices
Total questions: 15
Worksheet time: 10mins
In a PN junction with no external voltage, the electric field between acceptor and donor ions is called a
A.Peak
B.Barrier
C.Threshold
D.Path
The capacitance of a reverse biased PN junction
A.Increases as reverse bias is increased
B.Decreases as reverse bias is increased
C.Increases as reverse bias is decreased
D.Is insignificantly low
When PN junction is in forward bias, by increasing the battery voltage
A.Circuit resistance increases
B.Current through P-N junction increases
C.Current through P-N junction decreases
D.None of the above happens
In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as .............
A.Depletion, negative bias
B.Reverse, reverse bias
C.Resistance, reverse bias
D.Barrier, forward bias
Zener diodes are also known as
(a)
A 9.1-V zener diode exhibits its nominal voltage at a test current of 28 mA. At this current the incremental resistance is specified as 5 Ω. Find VZ0 of the Zener model.
a) 8.96V
b) 9.03V
c) 9.17V
d) 9.24V
Efficiency of a half wave rectifier is
50%
40.6%
60%
46%
Ripple factor of a half wave rectifier is_________(Im is the peak current and RL is load resistance)
a) 1.414
b) 1.21
c) 1.4
d) 0.48
The cut off voltage for diode of silicon semiconductor and germanium semiconductor is ____ volts.
a) 0.5 and 0.1
b) 0.7 and 0.3
c) 1 and 0.5
d) 0.5 and 1
The rectifier current is a short duration pulses which cause the diode to act as a_________
Voltage Regulator
Switch
Oscillator
Mixer
In an NPN transistor, the arrow is pointed towards (a)
The total emitter current (IE) is given by_________
a) IE = IpE * InE
b) IE = IpE – InE
c) IE = IpE / InE
d) IE = IpE + InE
A transistor has an IC of 100mA and IB of 0.5mA. What is the value of alpha?
a) 0.565
b) 0.754
c) 1.24
d) 0.995
The base current amplification factor β is given by_________
a) IC/IB
b) IB/IC
c) IE/IB
d) IB/IE
In the saturated region, the transistor acts like a_________
a) poor transistor
b) amplifier
c) open switch
d) closed switch
