1.
The Bandwidth of an n-stage tuned Amplifier, with each stage
having a bandwidth of B, is given by
2. In the BJT amplifier shown in the figure, the transistor is biased
in the forward active region putting a capacitor across Re will
(a) decrease the voltage gain and decrease the i/p impedance.
(b) increase the voltage gain and decrease the i/p impedance.
(c) decrease the voltage gain and increase the i/p impedance.
(d) increase the voltage gain and increase the i / p impedance.
3.A cascode Amplifier stage is equivalent to
(a) A common emitter stage followed by a common base stage.
(b) A common base stage followed by an Emitter follower.
(c) An Emitter follower stage followed by a common base stage.
(d) A common base stage followed by a common Emitter stage.
5.Choose the correct match for input resistance of various
Amplifier Configuration shown in below.
Configuration CB: Common Base CC: Common Collector
CE : Common Emitter
Input Resistance LO: Low MO: Moderate HI: High
(a) CB-LO, CC-МО, СЕ-НІ
(b) CB-HI, CC-LO, CE-MO
(c) CB-LO, CC-НІ, СЕ-МО
(d) CB-MO, CC-HI, CE-LO
6.If the emitter resistance in a common-emitter voltage amplifier is
not bypassed, it will
(a) reduce both the voltage gain and the input impedance.
(b) reduce the voltage gain and increase the input impedance.
(c) increase the voltage gain and reduce the input impedance.
(d) increase both the voltage gain and the input impedance.
7.The quiescent collector current I_{c} of a transistor is increased by
changing resistances. As a result
(a) g will not be affected
(b) g_{m} will decrease
(c) g_{m} will increase
(d) g_{m} will increase or decrease depending upon bias stability.
8. Which of the following statements are correct for basic transistor
Amplifier configurations?
(a) CB Amplifiers has low input impedance and low current gain.
(b) CC Amplifiers has low output impedance and a high current gain.
(c) CE Amplifier has very poor voltage gain but very high input
impedance.
(d) The current gain of CB Amplifier is higher than the current gain of
CC Amplifiers
9.In a multi-stage RC-Coupled Amplifier the coupling capacitor.
(a)limits the low frequency response.
(b)limits the high frequency response.
(c)does not effect the frequency response.
(d)blocks the duc components without effecting the frequency
response.
10.
11.The current gain of a bipolar transistor drops at high frequencies
because of
(a) Transistor capacitances
(b) High current effects in the base
(c) Parasitic inductive elements
(d) The Early effect
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13. Generally, the gain of a transistor Amplifier falls at high
frequency due to the (a)Internal Capacitances of the device
(b) Coupling Capacitor at the input
(c) Skin Effect
(d)Coupling Capacitor at the output
14. Introducing a resistor in the emitter of a common amplifier,
stabilizes the dc operating point against variations in
(a) Only the temperature
(b) Only the ẞ of the transistor
(c) Both temperature and ẞ
(d) None of the above
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16. Which one of the following statements is correct about an ac-
coupled common-emitter amplifier operating in the mid-band region?
(a) The device parasitic capacitances behave like open circuits,
whereas coupling and bypass capacitances behave like short circuits.
(b) The device parasitic capacitances, coupling capacitances and
bypass capacitances behave like open circuits.
(c) The device parasitic capacitances, coupling capacitances and
bypass capacitances behave like short circuits.
(d) The device parasitic capacitances behave like short circuits,
whereas coupling and bypass capacitances behave like open circuits.
17.The Miller effect in the context of a Common Emitter amplifier
explains
(a) an increase in the low-frequency cutoff frequency
(b) an increase in the high-frequency cutoff frequency
(c) a decrease in the low-frequency cutoff frequency
(d) a decrease in the high-frequency cutoff frequency
18. The cascode amplifier is a configuration of
(a) CC-CB (b) CE-CB (c) CB-CC (d) CE-CC
19
D
.
9 A 17 D
1 C
10 A 18 B
2 B
11 A 19 C
3 A
12 D 20 C
4 C
13 A
5 C
14 A
6 B
15 C
7 C
16 A
8 A&B
