Analog Circuits Mock Test 5

10%

Question 1 of 10

1. Why are we worried about β during the Collector feedback configuration?

To maintain a stable input impedance

To maintain a stable q-point irrespective of β

To increase the gain

To decrease the output impedance

Question 1 of 10

Question 2 of 10

2. What is the role of emitter resistance in the transistor amplifying circuit?

To prevent increase in gain

To prevent thermal runaway

To lower the output impedance

To increase gain

Question 2 of 10

Question 3 of 10

3. Which of the following is not considered for quiescent operating point?

DC base current

DC collector current

DC collector-emitter voltage

DC input voltage

Question 3 of 10

Question 4 of 10

4. What are the effects on the output voltage if the Collector resistance increases in a Collector feedback configuration?

Bias voltage doubles

Not much effect

Bias voltage reduces

Bias voltage increases

Question 4 of 10

Question 5 of 10

5. If 1/h₁₂ = 4, for a C.E. stage- what is the value of the base to collector capacitance, after Miller multiplication, at the input side?

6C_µ

1.1C_µ

4C_µ

5C_µ

Question 5 of 10

Question 6 of 10

6. If source resistance in an amplifier circuit is zero, then voltage gain (output to input voltage ratio) and source voltage gain (output to source voltage ratio) are the same.

False

True

Question 6 of 10

Question 7 of 10

7. What is the role of input capacitance in the transistor amplifying circuit?

There isn’t any role for input capacitance

To prevent DC content in the input from reaching transistor

To prevent input variation from reaching output

To increase input impedance

Question 7 of 10

Question 8 of 10

8. What is the roll-off rate of single order filter?

5dB/octave

10dB/octave

20dB/decade

40dB/decade

Question 8 of 10

Question 9 of 10

9. If a C.E. stage has a load R_l and transconductance g_m, what is the factor by which the capacitance between the base and the collector at the input side gets multiplied?

1 + 2*g_mR_l

1 + g_mR_l

1 - g_mR_l

1 - 2*g_mR_l

Question 9 of 10

Question 10 of 10

10. If the output power from an audio amplifier is measured at 100W when the signal frequency is 1kHz, and 1W when the signal frequency is 10kHz. Calculate the dB change in power.

-30dB

-20dB

15dB

-10dB

Question 10 of 10