21
At cut-off, the JFET channel is ……….
Answer: completely closed by the depletion region
Questions
22
The constant-current region of a JFET lies between
Answer: pinch-off and breakdown
23
A certain JFET data sheet gives VGS(off) = -4 V. The pinch-off voltage Vp is ……..
Answer: +4 V
24
For VGS = 0 V, the drain current becomes constant when VDS exceeds ………
Answer: VP
26
If the cross-sectional area of the channel in n-channel JEFT increases, the drain current ……….
Answer: is increased
27
The output characteristics of a JFET closely resemble the output characteristics of a ………. valve
Answer: pentode
28
The source terminal of a JEFT corresponds to ………….. of a vacuum tube
Answer: cathode
31
The gate voltage in a JFET at which drain current becomes zero is called ……….. voltage
Answer: pinch-off
34
If the gate of a JFET is made less negative, the width of the conducting channel……….
Answer: is increased
35
In class A operation, the input circuit of a JFET is ………. biased
Answer: reverse
36
The pinch-off voltage in a JFET is analogous to ………. voltage in a vacuum tube
Answer: grid cut off
37
A MOSFET uses the electric field of a ………. to control the channel current
Answer: capacitor
38
Which of the following devices has the highest input impedance?
Answer: MOSFET
39
A MOSFET differs from a JFET mainly because ………………
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 …………
Answer: 20 mA
