Field Effect Transistor Quiz | Field Effect Transistor Objective Type Questions and Answers

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Questions
21 At cut-off, the JFET channel is ……….
A at its widest point
B completely closed by the depletion region
C extremely narrow
D reverse baised

Answer: completely closed by the depletion region
22 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

Answer: pinch-off and breakdown
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23 A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is ……..
A +4 V
B -4 V
C dependent on VGS
D data insufficient

Answer: +4 V
24 For VGS = 0 V, the drain current becomes constant when VDS exceeds ………
A cut off
B VDD
C VP
D none of the above

Answer: VP
25 The channel of a JFET is between the …………….
A gate and drain
B drain and source
C gate and source
D input and output

Answer: drain and source
26 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

Answer: is increased
27 The output characteristics of a JFET closely resemble the output characteristics of a ………. valve
A pentode
B tetrode
C triode
D diode

Answer: pentode
28 The source terminal of a JEFT corresponds to ………….. of a vacuum tube
A plate
B cathode
C grid
D none of the above

Answer: cathode
29 The transconductance of a JFET ranges from ……………..
A 100 to 500 mA/V
B 500 to 1000 mA/V
C 0.5 to 30 mA/V
D above 1000 mA/V

Answer: 0.5 to 30 mA/V
30 In a FET, there are ……….. pn junctions at the sides
A three
B four
C five
D two

Answer: two
31 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

Answer: pinch-off
32 The input impedance of a MOSFET is of the order of ………..
A O
B a few hundred O
C kO
D several MO

Answer: several MO
33 The pinch-off voltage of a JFET is about ……….
A 5 V
B 0.6 V
C 15 V
D 25 V

Answer: 5 V
34 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

Answer: is increased
35 In class A operation, the input circuit of a JFET is ………. biased
A forward
B reverse
C not
D none of the above

Answer: reverse
36 The pinch-off voltage in a JFET is analogous to ………. voltage in a vacuum tube
A anode
B cathode
C grid cut off
D none of the above

Answer: grid cut off
37 A MOSFET uses the electric field of a ………. to control the channel current
A capacitor
B battery
C generator
D none of the above

Answer: capacitor
38 Which of the following devices has the highest input impedance?
A JFET
B MOSFET
C Crystal diode
D ordinary transistor

Answer: MOSFET
39 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

Answer: the JFET has a pn junction
40 A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is …………
A 20 mA
B 0 mA
C 40 mA
D 10 mA

Answer: 20 mA
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