Basic Electronics (3110016) MCQs

MCQs of AC Analysis of BJT circuits and small signal amplifier

Showing 91 to 100 out of 120 Questions
7 8 9 10 11 12
91.
The input impedance of the base of an emitter follower is usually
(a) Low
(b) High
(c) Shorted to ground
(d) Open
Answer:

Option (b)

92.
The DC current gain of an emitter follower is across the
(a) 0
(b) ≈1
(c) βdc
(d) Dependent on re'
Answer:

Option (c)

93.
The AC base voltage of the emitter follower is across the
(a) Emitter diode
(b) DC emitter resistor
(c) Load resistor
(d) Emitter diode and external ac emitter resistance
Answer:

Option (d)

94.
The output voltage of an emitter follower is across the
(a) Emitter diode
(b) DC collector resistor
(c) Load resistor
(d) Emitter diode and external ac emitter resistance
Answer:

Option (c)

95.
If β = 200 and re = 150 Ω, the input impedance of the base is
(a) 30 kΩ
(b) 600 Ω
(c) 3 kΩ
(d) 5 kΩ
Answer:

Option (a)

96.
The input voltage to an emitter follower is usually
(a) Less than the generator voltage
(b) Equal to the generator voltage
(c) Greater than the generator voltage
(d) Equal to the supply voltage
Answer:

Option (a)

97.
The AC emitter current is closest to
(a) VG divided by re
(b) Vin divided by re'
(c) VG divided by re'
(d) Vin divided by re
Answer:

Option (d)

98.
The output voltage of an emitter follower is approximately
(a) 0
(b) VG
(c) Vin
(d) VCC
Answer:

Option (c)

99.
The output voltage of an emitter follower is
(a) In phase with Vin
(b) Much greater than Vin
(c) 180⁰ out of phase
(d) Generally much less than Vin
Answer:

Option (a)

100.
An emitter-follower buffer is generally used when
(a) RG < < RL
(b) RG = RL
(c) RL < < RG
(d) RL is very large
Answer:

Option (c)

Showing 91 to 100 out of 120 Questions
7 8 9 10 11 12