21. Which voltage increases the channel size?
A. negative Vgs
B. positive Vgs
C. negative Vds
D. positive Vds
Answer: B
A positive gate to source voltage increases the channel size and allows the electrons to flow easily.
22. Which relation is correct?
A. Vgs greater than Vds
B. Vds greater than Vgs
C. Vds equal to Vgs
D. Vgs lesser than Vds
Answer: A
In FET, for either depletion or enhancement mode devices, the drain to source voltage is much less than the gate to source voltage.
23. Which mode of operation of FET is used, when amplification is needed?
A. active
B. saturation
C. non-saturation
D. linear
Answer: B
Saturation mode, which is in between the ohmic and saturation region is used when amplification is needed.
24. Which color is used to represent first-level metal?
A. brown
B. blue
C. dark blue
D. green
Answer: B
Blue (metal 1) is used to represent first-level metal and dark blue (metal 2) is used for second-level metal.
25. The _______ mask identifies all active regions.
A. blue layer
B. red layer
C. yellow layer
D. green layer
Answer: D
The green layer mask identifies all active regions such as areas that eventually form E and D type devices, active loads, and implant resistors.
26. ______ forms the more heavily doped channel of D-MESFET.
A. red inside yellow layer
B. green inside yellow layer
C. yellow inside green layer
D. green outside yellow layer
Answer: B
The green region inside the yellow layer mask forms the more heavily doped channel of the D-MESFET.
27. _______ is used to represent the lightly doped channel of E-MESFET.
A. red inside yellow layer
B. green inside yellow layer
C. yellow inside green layer
D. green outside yellow layer
Answer: D
Green regions outside the yellow layer from the lightly doped channel of the E type MESFET.
28. ______ is used to represent implant.
A. yellow
B. red
C. green
D. brown
Answer: C
The green color is used to represent the implant layer. Symbolically it is represented as E-MESFET and it is formed when crossed by gate-metal.
29. _____ is used to represent ohmic contact.
A. yellow
B. red
C. green
D. brown
Answer: D
Brown is used to representing ohmic contact and it is used with source/drain contacts.
30. In the ring diagram, the green line is used to represent
A. E-MESFET
B. D-MESFET
C. Interconnection
D. Transistor
Answer: A
In the ring diagram, a green or dotted line represents E-MESFET while a yellow or solid line represents D-MESFET.
