The gate voltage in a JFET at which drain current becomes zero is called ___________ voltage
A. saturation
B. pinch-off
C. active
D. cut-off
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The output characteristics of a JFET closely resemble the output characteristics of a ___________ valve
A. pentode
B. tetrode
C. triode
D. diode
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The constant-current region of a JFET lies between
A. cut off and saturation
B. cut off and pinch-off
C. o and IDSS
D. pinch-off and breakdown
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A JFET has high input impedance because ___________
A. it is made of semiconductor material
B. input is reverse biased
C. of impurity atoms
D. none of the above
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A MOSFET differs from a JFET mainly because ___________
A. of power rating
B. the MOSFET has two gates
C. the JFET has a pn junction
D. none of the above
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If the reverse bias on the gate of a JFET is increased, then width of the conducting channel ___________
A. is decreased
B. is increased
C. remains the same
D. none of the above
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If the gate of a JFET is made less negative, the width of the conducting channel ___________
A. remains the same
B. is decreased
C. is increased
D. none of the above
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If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ___________
A. is increased
B. is decreased
C. remains the same
D. none of the above
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In a certain common source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is ___________
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In a certain CS JFET amplifier, RD = 1 kΩ , RS = 560 Ω , VDD = 10 V and gm = 4500 µS. If the source resistor is completely bypassed, the voltage gain is ___________.
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The input control parameter of a JFET is ___________
A. gate voltage
B. source voltage
C. drain voltage
D. gate current
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The input impedance of a JFET is ___________ that of an ordinary transistor
A. equal to
B. less than
C. more than
D. none of the above
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A MOSFET uses the electric field of a ___________ to control the channel current
A. capacitor
B. battery
C. generator
D. none of the above
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A JFET has three terminals, namely ___________
A. cathode, anode, grid
B. emitter, base, collector
C. source, gate, drain
D. none of the above
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The source terminal of a JEFT corresponds to ___________ of a vacuum tube
A. plate
B. cathode
C. grid
D. none of the above
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A JFET is a ___________ driven device
A. current
B. voltage
C. both current and voltage
D. none of the above
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A JFET has ___________ power gain
A. small
B. very high
C. very small
D. none of the above
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A JFET is also called ___________ transistor
A. unipolar
B. bipolar
C. unijunction
D. none of the above
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A common base configuration of a pnp transistor is analogous to ___________ of a JFET
A. common source configuration
B. common drain configuration
C. common gate configuration
D. none of the above
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A MOSFET has ___________ terminals
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