Free Printable BJT Ac Analysis

1.

What is the equation uses to calculate the value of re?

a)

20mv/IE

b)

26mv/IE

c)

26mv/IC

d)

25mv/IE

2.

Choose the correct component in the re model shown in the figure:

a)

(i) re, (ii) $\beta Ib$ , (iii) ro

b)

(i) $\beta re$ , (ii) Ib, (iii) ro

c)

(i) $\beta re$ , (ii) $\beta Ib$ , (iii) ro

d)

(i) $\beta$ , (ii) Ib, (iii) ro

3.

In AC analysis, DC supply, coupling capacitor and bypass capacitor is replaced with (a)

4.

In AC analysis, DC supply, coupling capacitor and bypass capacitor is replaced with (a)

5.

Choose the correct statement on AC analysis of BJT Common Emitter Emitter bias circuit in the following circuit

a)

resistor R_E is absence due to short circuit equivalent of bypass capacitor C_E

b)

resistor R_E is absence due to open circuit equivalent of bypass capacitor C_E

c)

d)

6.

Negative sign in the voltage gain equation shows (a) degree phase shift between input and output

7.

Calculate the value of IE and Av of the following circuit and then choose the most appropriate answer. Assume ro= $\infty\Omega$

a)

IE=1.89 mA

b)

IE = 1.25 mA

c)

Av= -359.25

d)

Av=-406.98

8.

The biasing of a transistor is a combination of ac and dc operation

a)

True

b)

False

c)

Trulse

d)

Not Sure

9.

The purpose of biasing is to establish a/an ________ about which variations in current and voltage can occur in response to an input signal

a)

Operating Point

b)

Saturation Point

c)

Linear Point

d)

Active Point

10.

If an amplifier is NOT biased with correct DC voltages on the input and output, the amplifiers operation is said to be

a)

Linear

b)

Nonlinear

c)

Collinear

d)

Bipolar

11.

It is a signal that use only a small portion of the load line

a)

Large Signal

b)

DC Signal

c)

Small Signal

d)

No Signal

12.

An electronic circuit having the capability to amplify power, voltage or current

a)

Rectifier

b)

Amplifier

c)

Synthesizer

d)

Mixer

13.

In Electronics, this term means linking of two circuits or devices which can be capacitive, inductive, resistive or direct

a)

interconnecting

b)

Joining

c)

Combining

d)

Coupling

14.

The capacitors in the input and output side of the amplifiers network used to

a)

blocks DC and allows AC signal

b)

blocks DC and AC signal

c)

allows DC and blocks AC signal

d)

allows DC and AC signal

15.

The capacitors appear ideally _______ to the input and output signal voltages

a)

open

b)

short

c)

disconnected

d)

isolated

16.

The input current of a common base configuration is

a)

collector current

b)

base current

c)

emitter current

d)

diode current

17.

The output voltage of a common emitter emitter stabilized network is

a)

VEC

b)

VEB

c)

VCE

d)

VBE

18.

The AC current gain of a common emitter configuration is

a)

Beta AC

b)

Alpha AC

c)

Beta DC

d)

Alpha AC

19.

Which is true for a common base BJT amplifier?

a)

Output voltage (VC) is in-phase with the input voltage (VE)

b)

Output voltage (VC) is out-of-phase with the input voltage (VE)

c)

Output current (IC) is in-phase with the input current (IE)

d)

Output current (IC) is out-of-phase with the input current (IB)

20.

Choose the correct formula for BJT

a)

$IE=IC+IB$

b)

$I_C=\beta I_E$

c)

$\alpha=\frac{I_C}{I_E}$

d)

$I_C=\beta I_B$

21.

The given circuit has a voltage gain of -1000. If the input voltage Vi is 1mV. What is the value of Vo in the circuit?

(a)

22.

The ratio of dc collector current (IC) to dc emitter current (IE)

a)

gamma

b)

theta

c)

beta

d)

alpha

23.

If the emitter-base junction is forward biased and the collector-base junction is reverse biased, what will be the region of operation for a transistor?

a)

cut off region

b)

saturated region

c)

inverted region

d)

active region

24.

In the BJT amplifier circuit, I_C = 1 mA. Estimate the gain, A_v (with r_o is infinite).

a)

$\approx100$

b)

$\approx-6800$

c)

$\approx-262$

d)

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BJT Ac Analysis

Total questions: 24

Worksheet time: 12mins

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