Question 1

Which of the following is not a classification of amplifiers on the basis of their frequency response?&#10;A)capacitively coupled amplifier&#10;B)direct coupled amplifier&#10;C)bandpass amplifier&#10;D)none of the mentioned

Accepted Answer

All the options listed (A, B, C) are classifications of amplifiers based on their frequency response, making D the correct choice as it implies none of the mentioned classifications are incorrect.

Question 2

General representation of the frequency response curve is called&#10;A)bode plot&#10;B)miller plot&#10;C)thevenin plot&#10;D)bandwidth plot

Accepted Answer

A bode plot is a graphical representation of a system's frequency response. It is used to analyze the gain and phase shift of a system as a function of frequency, making it the correct choice for the general representation of the frequency response curve.

Question 3

Under what condition can the circuit shown be called a compensated attenuator.&#10;A)c1r1 = c2r2&#10;B)c1r2 = c2r1&#10;C)c1c2 = r1r2&#10;D)r1 = 0

Accepted Answer

For a compensated attenuator, the time constants of the RC networks must be equal, which is represented by the equation c1r1 = c2r2.

Question 4

Which of the following is true?&#10;A)coupling capacitors causes the gain to fall off at high frequencies&#10;B)internal capacitor of a device causes the gain to fall off at low frequencies&#10;C)all of the mentioned&#10;D)none of the mentioned

Accepted Answer

Coupling capacitors cause the gain to fall off at low frequencies, and internal capacitors cause the gain to fall off at high frequencies.

Question 5

Which of the following is true?&#10;A)monolithic ic amplifiers are directly coupled or dc amplifiers&#10;B)televisions and radios use tuned amplifiers&#10;C)audio amplifiers have coupling capacitor amplifier&#10;D)all of the mentioned

Accepted Answer

All the statements provided are true. Monolithic IC amplifiers are indeed directly coupled or DC amplifiers, allowing for the amplification of very low-frequency signals. Televisions and radios use tuned amplifiers to select and amplify a specific frequency or band of frequencies from the broad spectrum of signals received. Audio amplifiers often use coupling capacitors to block DC components of signals, allowing only the AC components (the actual audio signals) to be amplified.

Question 6

During high frequency applications of a B.J.T., which parasitic capacitors arise between the base and the emitter?&#10;A)cje and cb&#10;B)ccs&#10;C)cb&#10;D)ccs and cb

Accepted Answer

The parasitic capacitors that arise between the base and emitter during high frequency applications of a Bipolar Junction Transistor (B.J.T.) are the base-emitter junction capacitance (cje) and the base-collector junction capacitance (cb). These capacitors affect the high-frequency response of the BJT.

Question 7

During high frequency applications of a B.J.T., which parasitic capacitors arise between the collector and the emitter?&#10;A)no capacitor arises&#10;B)ccs&#10;C)cb&#10;D)ccs and cb

Accepted Answer

The answer of During high frequency applications of a B.J.T.,...

Question 8

During high frequency applications of a B.J.T, which parasitic capacitors arise between the collector and the base?&#10;A)cje and cb&#10;B)ccs&#10;C)c?&#10;D)c&#181;

Accepted Answer

In high-frequency applications of a Bipolar Junction Transistor (B.J.T), the parasitic capacitor that arises between the collector and the base is denoted as $C_\mu$ or sometimes referred to as the collector-base capacitance. This capacitance affects the high-frequency response of the transistor.

Question 9

Which parasitic capacitors do not affect the frequency response of the C.E. stage, of the B.J.T.?&#10;A)cje and cb&#10;B)ccs and c&#181;&#10;C)cb and c&#181;&#10;D)no parasitic capacitor gets deactivated

Accepted Answer

All parasitic capacitors in a BJT can affect the frequency response of the common emitter (C.E.) stage, as they introduce additional paths for signal currents, potentially altering the bandwidth and phase response.

Question 10

Which parasitic capacitors don't affect the frequency response of the C.B. stage of the B.J.T.?&#10;A)none of the parasitic capacitances&#10;B)all the parasitic capacitances&#10;C)some of the coupling capacitors&#10;D)ccs and cb

Accepted Answer

All the parasitic capacitances in the Common Base (C.B.) stage of a Bipolar Junction Transistor (B.J.T.) do not significantly affect the frequency response. This is because in the C.B. configuration, the input signal is applied to the emitter, and the output is taken from the collector, with the base grounded. This configuration inherently offers a low input impedance and a wide bandwidth, making it less sensitive to the effects of parasitic capacitances compared to other configurations like Common Emitter (C.E.) or Common Collector (C.C.).

Question 11

Which parasitic capacitors don't affect the frequency response of the C.C. stage of the B.J.T.?&#10;A)ccs&#10;B)ccs and cb&#10;C)cb&#10;D)ccs and c&#181;

Accepted Answer

The answer of Which parasitic capacitors don't affect the frequency...

Question 12

If the transconductance of the B.J.T increases, the transit frequency &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#10;A)increases&#10;B)decreases&#10;C)doesn't get affected&#10;D)doubles

Accepted Answer

The answer of If the transconductance of the B.J.T increases,...

Question 13

If the total capacitance between the base and the emitter increases by a factor of 2, the transit frequency &#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#10;A)reduces by 2&#10;B)increases by 2&#10;C)reduces by 4&#10;D)increases by 4

Accepted Answer

The answer of If the total capacitance between the base...

Question 14

Which effect plays a critical role in producing changes in the frequency response of the B.J.T.?&#10;A)thevenin's effect&#10;B)miller effect&#10;C)tellegen's effect&#10;D)norton's effect

Accepted Answer

The answer of Which effect plays a critical role in...

Question 15

If a C.E. stage has a load Rl and transconductance gm, what is the factor by which the capacitance between the base and the collector at the input side gets multiplied?&#10;A)1 + gmrl&#10;B)1 - gmrl&#10;C)1 + 2*gmrl&#10;D)1 - 2*gmrl

Accepted Answer

The answer of If a C.E. stage has a load...

Question 16

If a C.E. stage has a load Rl and transconductance gm, what is the factor by which the capacitance between the base and the collector at the output side gets multiplied?&#10;A)1 + 1/gmrl&#10;B)1 - 1/gmrl&#10;C)1 + 2/gmrl&#10;D)1 - 2/gmrl

Accepted Answer

The answer of If a C.E. stage has a load...

Question 17

Gain bandwidth frequency is GBP= 3000 Mhz. The cut-off frequency is f=10Mhz. What is the CE short circuit current gain at the ? cutoff frequency?&#10;A)212&#10;B)220&#10;C)300&#10;D)200

Accepted Answer

The answer of Gain bandwidth frequency is GBP= 3000 Mhz....

Question 18

Which of the statement is incorrect?&#10;A)at unity gain frequency the ce short circuit current gain becomes 1&#10;B)unity gain frequency is the same as gain

Accepted Answer

The answer of Which of the statement is incorrect?&#10;A)at unity...

Question 19

In an RC coupled CE amplifier, when the input frequency increases, which of these are incorrect?&#10;A)reactance csh decreases&#10;B)voltage gain increases&#10;C)voltage gain decreases due to shunt capacitance&#10;D)an rc coupled amplifier behaves like a low pass filter

Accepted Answer

The answer of In an RC coupled CE amplifier, when...

Question 20

In Miller's theorem, what is the constant K?&#10;A)total voltage gain&#10;B)internal voltage gain&#10;C)internal current gain&#10;D)internal power gain

Accepted Answer

The answer of In Miller's theorem, what is the constant...

Question 21

When applying miller's theorem to resistors, resistance R1 is for node 1 and R2 for node 2. If R1>R2, then for same circuit, then for capacitance for which the theorem is applied, which will be larger, C1 or C2?

A)c1
B)c2
C)both are equal
D)insufficient data

Accepted Answer

The answer of When applying miller's theorem to resistors, resistance...

Question 22

Find net voltage gain, given hfe = 50 and hie = 1k?.&#10;A)27.68&#10;B)-22&#10;C)30.55&#10;D)-27.68

Accepted Answer

The answer of Find net voltage gain, given hfe =...

Deck 6: BJT Frequency Response and Capacitance Analysis