Basic Electronics (3110016) MCQs

MCQs of AC Analysis of BJT circuits and small signal amplifier

Showing 21 to 30 out of 120 Questions
1 2 3 4 5 6
21.
In the DC equivalent circuit of a transistor amplifier, the capacitors are considered _______
(a) Short
(b) Open
(c) Partially short
(d) None of the above
Answer:

Option (b)

22.
When the AC base voltage is too large, the AC emitter current is
(a) Sinusoidal
(b) Constant
(c) Distorted
(d) Alternating
Answer:

Option (c)

23.
In a CE amplifier with a large input signal, the positive half cycle of the AC emitter current is
(a) Equal to the negative half cycle
(b) Smaller than the negative half cycle
(c) Larger than the negative half cycle
(d) Equal to the negative half cycle
Answer:

Option (c)

24.
AC emitter resistance equals 25 mV divided by the
(a) Quiescent base current
(b) DC emitter current
(c) AC emitter current
(d) Change in collector current
Answer:

Option (b)

25.
To reduce the distribution in a CE amplifier, reduce the
(a) DC emitter current
(b) Base-emitter current
(c) Collector current
(d) AC base voltage
Answer:

Option (d)

26.
If the AC voltage across the emitter diode is 1 mV and the AC emitter current is 100 µA, the AC resistance of the emitter diode is
(a) 1 Ω
(b) 10 Ω
(c) 100 Ω
(d) 1 kΩ
Answer:

Option (b)

27.
A graph of AC emitter current versus AC base-emitter voltage applies to the
(a) Resistor
(b) Emitter diode
(c) Collector diode
(d) Power supply
Answer:

Option (b)

28.
The output voltage of a CE amplifier is
(a) Amplified
(b) Inverted
(c) 180⁰ out of phase with the input
(d) All of the above
Answer:

Option (d)

29.
The emitter of a CE amplifier has no AC voltage because of the
(a) DC voltage on it
(b) Bypass capacitor
(c) Coupling capacitor
(d) Load resistor
Answer:

Option (b)

30.
The voltage across the load resistor of a capacitor-coupled CE amplifier is
(a) DC and AC
(b) DC only
(c) AC only
(d) Neither DC nor AC
Answer:

Option (c)

Showing 21 to 30 out of 120 Questions
1 2 3 4 5 6