Transistors and Applications

Q1: A JFET

A
is a current-controlled device

B
has a low input resistance

C
is a voltage-controlled device

D
is always forward-biased

Q2: To get a negative gate-source voltage in a self-biased JFET circuit, you must use a

A
voltage divider

B
source resistor

C
ground

D
negative gate supply voltage

Q3: A source follower has a voltage gain (Av) of

A
AV = gmRd

B
AV = gmRS

C
mca17_1012c1.gif

D
mca17_1012d1.gif

Q4: Often a common-collector will be the last stage before the load; the main function of this stage is to

A
provide voltage gain

B
buffer the voltage amplifiers from the low-resistance load

C
provide phase inversion

D
provide a high-frequency path to improve the frequency response
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Q5: Three different points are shown on a dc load line. The upper point represents the

A
minimum current gain

B
quiescent point

C
saturation point

D
cutoff point

Q6: The signal voltage gain of an amplifier, Av, is defined as:

A
mca17_1003a1.gif

B
Av = IC × RC

C
mca17_1003c1.gif

D
mca17_1003d1.gif

Q7: The capacitor that produces an ac ground is called a(n)

A
coupling capacitor

B
dc open

C
bypass capacitor

D
ac open

Q8: The primary function of the bias circuit is to

A
hold the circuit stable at VCC

B
hold the circuit stable at vin

C
ensure proper gain is achieved

D
hold the circuit stable at the designed Q-point

Q9: The formula used to calculate the approximate ac resistance of the base-emitter diode (re) is

A
mca17_1005a1.gif

B
re almostequal.jpg 25 mV × IC

C
mca17_1005c1.gif

D
mca17_1005d1.gif

Q10: The depletion-mode MOSFET

A
can operate with only positive gate voltages

B
can operate with only negative gate voltages

C
cannot operate in the ohmic region

D
can operate with positive as well as negative gate voltages

Q11: Which of the following conditions are needed to properly bias an npn transistor amplifier?

A
Forward bias the base/emitter junction and reverse bias the base/collector junction.

B
Forward bias the collector/base junction and reverse bias the emitter/base junction.

C
Apply a positive voltage on the n-type material and a negative voltage on the p-type material.

D
Apply a large voltage on the base.

Q12: In order for feedback oscillators to have any practical value, the gain has to be

A
< 1

B
self-adjusting

C
stabilized

D
nonlinear

Q13: In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid

A
crossover distortion

B
unusually high efficiency

C
negative feedback

D
a low input impedance

Q14: A JFET

A
is a current-controlled device

B
has a low input resistance

C
is a voltage-controlled device

D
is always forward-biased


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