Question 1

Which effect plays a critical role in producing changes in the frequency response of the B.J.T.?

Accepted Answer

A)  thevenin's effect
B)  miller effect
C)  tellegen's effect
D)  norton's effectE) A) and C)
F) B) and D)

Question 2

In an RC coupled CE amplifier, when the input frequency increases, which of these are incorrect?

Accepted Answer

A)  reactance csh decreases
B)  voltage gain increases
C)  voltage gain decreases due to shunt capacitance
D)  an rc coupled amplifier behaves like a low pass filterE) C) and D)
F) None of the above

Question 3

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?

Accepted Answer

A)  1 + 1/gmrl
B)  1 - 1/gmrl
C)  1 + 2/gmrl
D)  1 - 2/gmrlE) All of the above
F) A) and D)

Question 4

Which parasitic capacitors don't affect the frequency response of the C.B. stage of the B.J.T.?

Accepted Answer

A)  none of the parasitic capacitances
B)  all the parasitic capacitances
C)  some of the coupling capacitors
D)  ccs and cbE) A) and D)
F) B) and D)

Question 5

Under what condition can the circuit shown be called a compensated attenuator.

Accepted Answer

A)  c1r1 = c2r2
B)  c1r2 = c2r1
C)  c1c2 = r1r2
D)  r1 = 0E) All of the above
F) B) and C)

Question 6

Which of the statement is incorrect?

Accepted Answer

A)  at unity gain frequency the ce short circuit current gain becomes 1
B)  unity gain frequency is the same as gainC) A) and B)
D) undefined

Question 7

During high frequency applications of a B.J.T., which parasitic capacitors arise between the base and the emitter?

Accepted Answer

A)  cje and cb
B)  ccs
C)  cb
D)  ccs and cbE) A) and B)
F) B) and D)

Question 8

Which parasitic capacitors do not affect the frequency response of the C.E. stage, of the B.J.T.?

Accepted Answer

A)  cje and cb
B)  ccs and cµ
C)  cb and cµ
D)  no parasitic capacitor gets deactivatedE) None of the above
F) A) and D)

Question 9

General representation of the frequency response curve is called

Accepted Answer

A)  bode plot
B)  miller plot
C)  thevenin plot
D)  bandwidth plotE) B) and D)
F) B) and C)

Question 10

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?

Accepted Answer

A)  212
B)  220
C)  300
D)  200E) A) and D)
F) None of the above

Question 11

Which of the following is true?

Accepted Answer

A)  monolithic ic amplifiers are directly coupled or dc amplifiers
B)  televisions and radios use tuned amplifiers
C)  audio amplifiers have coupling capacitor amplifier
D)  all of the mentionedE) B) and D)
F) None of the above

Question 12

During high frequency applications of a B.J.T., which parasitic capacitors arise between the collector and the emitter?

Accepted Answer

A)  no capacitor arises
B)  ccs
C)  cb
D)  ccs and cbE) B) and D)
F) A) and D)

Question 13

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?

Accepted Answer

A)  c1
B)  c2
C)  both are equal
D)  insufficient dataE) C) and D)
F) All of the above

Question 14

Find net voltage gain, given hfe = 50 and hie = 1k?.

Accepted Answer

A)  27.68
B)  -22
C)  30.55
D)  -27.68E) A) and C)
F) All of the above D

Question 15

If the total capacitance between the base and the emitter increases by a factor of 2, the transit frequency

Accepted Answer

A)  reduces by 2
B)  increases by 2
C)  reduces by 4
D)  increases by 4E) None of the above
F) B) and D)

Question 16

Which parasitic capacitors don't affect the frequency response of the C.C. stage of the B.J.T.?

Accepted Answer

A)  ccs
B)  ccs and cb
C)  cb
D)  ccs and cµE) All of the above
F) B) and D)

Question 17

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?

Accepted Answer

A)  1 + gmrl
B)  1 - gmrl
C)  1 + 2*gmrl
D)  1 - 2*gmrlE) C) and D)
F) All of the above

Question 18

During high frequency applications of a B.J.T, which parasitic capacitors arise between the collector and the base?

Accepted Answer

A)  cje and cb
B)  ccs
C)  c?
D)  cµE) B) and C)
F) A) and D) D

Question 19

Which of the following is true?

Accepted Answer

A)  coupling capacitors causes the gain to fall off at high frequencies
B)  internal capacitor of a device causes the gain to fall off at low frequencies
C)  all of the mentioned
D)  none of the mentionedE) None of the above
F) All of the above D

Question 20

In Miller's theorem, what is the constant K?

Accepted Answer

A)  total voltage gain
B)  internal voltage gain
C)  internal current gain
D)  internal power gainE) A) and B)
F) A) and C)

Exam 6: BJT Frequency Response and Capacitance Analysis

Which effect plays a critical role in producing changes in the frequency response of the B.J.T.?

Correct AnswerverifiedShow Answer

In an RC coupled CE amplifier, when the input frequency increases, which of these are incorrect?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Which parasitic capacitors don't affect the frequency response of the C.B. stage of the B.J.T.?

Correct AnswerverifiedShow Answer

Under what condition can the circuit shown be called a compensated attenuator.

Correct AnswerverifiedShow Answer

Which of the statement is incorrect?

Correct AnswerverifiedShow Answer

During high frequency applications of a B.J.T., which parasitic capacitors arise between the base and the emitter?

Correct AnswerverifiedShow Answer

Which parasitic capacitors do not affect the frequency response of the C.E. stage, of the B.J.T.?

Correct AnswerverifiedShow Answer

General representation of the frequency response curve is called

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Which of the following is true?

Correct AnswerverifiedShow Answer

During high frequency applications of a B.J.T., which parasitic capacitors arise between the collector and the emitter?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Find net voltage gain, given hfe = 50 and hie = 1k?.

Correct AnswerverifiedD

If the total capacitance between the base and the emitter increases by a factor of 2, the transit frequency

Correct AnswerverifiedShow Answer

Which parasitic capacitors don't affect the frequency response of the C.C. stage of the B.J.T.?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

During high frequency applications of a B.J.T, which parasitic capacitors arise between the collector and the base?

Correct AnswerverifiedD

Which of the following is true?

Correct AnswerverifiedD

In Miller's theorem, what is the constant K?

Correct AnswerverifiedShow Answer

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D

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