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Electrical Engineering
Transistors
Quiz 4
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Q.1
The collector-base junction in a transistor has ___________
forward bias at all times
reverse bias at all times
low resistance
none of the above
Q.2
The circuit that provides the best stabilization of operating point is ___________
Base resistor bias
Collector feedback bias
Potential divider bias
None of the above
Q.3
Operating point represents ___________
Values of IC and VCE when signal is applied
The magnitude of signal
Zero signal values of IC and VCE
None of the above
Q.4
In a parallel LC circuit, if the input signal frequency is increased above resonant frequency then ___________
XL increases and XC decreases
XL decreases and XC increases
Both XL and XC increase
Both XL and XC decrease
Q.5
At the base emitter junctions of a transistor, one finds ___________
a reverse bias
a wide depletion layer
low resistance
none of the above
Q.6
The current IB is ___________
electron current
hole current
donor ion current
acceptor ion current
Q.7
In series resonance, there is ___________
Voltage amplification
Current amplification
Both voltage and current amplification
None of the above
Q.8
A heat sink is generally used with a transistor to ___________
increase the forward current
decrease the forward current
compensate for excessive doping
prevent excessive temperature rise
Q.9
For germanium transistor amplifier, VCE should ___________ for faithful amplification
Be zero
Be 0.2 V
Not fall below 0.7 V
None of the above
Q.10
The element that has the biggest size in a transistor is ___________
collector
base
emitter
collector-base-junction
Q.11
At parallel resonance, the phase angle between the applied voltage and circuit current is ___________
90°
180°
0°
None of the above
Q.12
At series or parallel resonance, the circuit behaves as a ___________ load
Capacitive
Resistive
Inductive
None of the above
Q.13
For faithful amplification by a transistor circuit, the value of VCE should ___________ for silicon transistor
Not fall below 1 V
Be zero
Be 0.2 V
None of the above
Q.14
At series resonance, the phase angle between applied voltage and circuit is ___________
90°
180°
0°
None of the above
Q.15
The collector of a transistor is ___________ doped
heavily
moderately
lightly
none of the above
Q.16
The point of intersection of d.c. and a.c. load lines represents ___________
Operating point
Current gain
Voltage gain
None of the above
Q.17
In a base resistor method, if the value of ß changes by 50, then collector current will change by a factor
25
50
100
200
Q.18
For good stabilsation in voltage divider bias, the current I1 flowing through R1 and R2 should be equal to or greater than
10 IB
3 IB
2 IB
4 IB
Q.19
The operating point is also called the ___________
Cut off point
Quiescent point
Saturation point
None of the above
Q.20
The input impedance of a transistor is ___________
high
low
very high
almost zero
Q.21
The value of a of a transistor is ___________
more than 1
less than 1
1
none of the above
Q.22
The output impedance of a transistor is ___________
high
zero
low
very low
Q.23
For frequencies above the resonant frequency, a parallel LC circuit behaves as a ___________ load
Capacitive
Resistive
Inductive
None of the above
Q.24
For frequencies below resonant frequency, a series LC circuit behaves as a ___________ load
Resistive
Capacitive
Inductive
None of the above
Q.25
For frequencies above the resonant frequency , a series LC circuit behaves as a ___________ load
Resistive
Inductive
Capacitive
None of the above
Q.26
At parallel resonance, the line current is ___________
Minimum
Maximum
Quite large
None of the above
Q.27
At parallel resonance, the net reactive component circuit current is ___________
Capacitive
Zero
Inductive
None of the above
Q.28
At series resonance, the net reactive component of circuit current is ___________
Zero
Inductive
Capacitive
None of the above
Q.29
The emitter of a transistor is ___________ doped
lightly
heavily
moderately
none of the above
Q.30
The base resistor method is generally used in
Amplifier circuits
Switching circuits
Rectifier circuits
None of the above
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