Free Printable Frequency Response of Amplifier

1.

In a FET Amplifier the source follower is a

a)

CS Amplifier

b)

CG amplifier

c)

CD amplifier

d)

none of above

2.

In a RC coupled amplifier ,the coupling capacitor

a)

limits the low frequency response

b)

limits the high frequency response

c)

independent of collector current

d)

proportional to square of the collector current

3.

The capacitive reactance is equal to

a)

$\frac{1}{2\pi f_c}$

b)

$2\pi f_c$

c)

$\pi f_c$

d)

$\frac{1}{\pi f_c}$

4.

The capacitive effects of transistor junction manifest themselves in

a)

low frequency

b)

middle frequency

c)

high frequency

d)

all the babove

5.

The emitter diffusion capacitance for a transistor is

a)

inversely proportional to the collector current

b)

directly proportional to the collector current

c)

independent of the collector current

d)

optional to the square of the collector current

6.

The voltage gain of an amplifier decreases at 20dB/decade above 100kHz. If the midband frequency gain is 80bB,what is the value of the voltage gain at 2MHz?

a)

60dB

b)

52dB

c)

54dB

d)

64dB

7.

$g_m$ The FT of a BJT is related to its $g_m$ , $C_{\pi}$ and $C_{\mu}$ as follows

a)

$f_T=\frac{C_{\pi}+C\mu}{g_m}$

b)

$f_T=\frac{2\pi\left(C_{\pi}+C_{\mu}\right)}{g_m}$

c)

$f_T=\frac{g_m}{C_{\pi}+C_{\mu}}$

d)

$f_T=\frac{g_m}{2\pi\left(C_{\mu}+C_{\pi}\right)}$

8.

Half power gain is the maximum gain minus

a)

6dB

b)

12dB

c)

3dB

d)

2dB

9.

$\beta$

The cut-off frequency $\beta$ is found from

a)

CC configuration

b)

CE configuration

c)

CB configuration

d)

none of the above.

10.

$\alpha$ The value of $\alpha$ cut-off frequency is

a)

greater than the $\beta$ cut-off frequency

b)

smaller than the $\beta$ cut-off frequency

c)

equal to the $\beta$ cut -off frequency

d)

none of the above

11.

The reference for dBm is

a)

1 milliwatt

b)

1 watt

c)

10 watts

d)

1 mega watts

12.

$\alpha$

The $\alpha$ cut-off frequency is found from

a)

CC configuration

b)

CE configuration

c)

CB configuration

d)

none of the above

13.

In a FET amplifier , the capacitor $C_{gs}$ and $C_{gd}$ typically vary from

a)

1 to 10pF

b)

1 to 10 $\mu$ F

c)

1 to 10 F

d)

none of the above

14.

The input impedance of a CS amplifier circuit is very high

a)

high frequency

b)

low frequency

c)

mid frequency

d)

zero frequency

15.

The output impedance will be lower at higher frequencies, thereby reducing the gain because

a)

the capacitive reactance's decreases with increase in frequency

b)

Capacitive reactance increases with the increase in frequency

c)

Capacitive reactance decreases with the decrease in frequency

d)

none of the above

Frequency Response of Amplifier

Total questions: 15

Worksheet time: 8mins

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