22. In a JFET operating above pinch-off voltage, the
A. drain current increases steeply
B. drain current remains practically constant
C. drain current starts decreasing
D. depletion regions become smaller
23. The main factor which differentiates a DE MOSFET from an E-onty MOSFET is the absence of
A. insulated gate
B. electrons
C. channel
D. P-N junctions
24. The polarity of VGs for E-only MOSFET is
A. positive
B. negative
C. zero
D. depends on P or N-channel
25. A diac is equivalent to a
A. pair of SCRs
B. pair of four-layer SCRs
C. diode and two resistors
D. triac with two gates
26. A UJT has RBB = 10 K and RB2 = 4K. Its intrinsic stand-off ratio is
A.0.6
B.0.4
C.2.5
D.513
27. Regarding triac which statement is false?
A. it is a 5-layer bi-directional semiconductor device
B. it can be triggered in response to both positive and negative gate signals
C. it is not particularly suited for AC or mains power control
D. any one of its main terminals can be used either as cathode or as anode
28. The best electronic device for fast switching is
A. BJT
B. triode
C. JFET
D. MOSFET
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