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Electronics Engineering Objective Questions { FET and FET Amplifiers }



15.  A DE MOSFET differs from a JFET in the sense that it has no
A. channel
B. gate
C. P-N junctions
D. substrate
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16. Grounding rings are used with MOSFETs in order to
A.protect them against any physical injury during transit
B.avoid any stray or static voltage at the gate
C.which may destroy Si02 layer protect them against any stray magnetic field
D. provide ground for eddy currents induced between its terminals
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17. For protecting a MOSFET against damage from stray voltage developing at the gate, following methods are used. Pick out the one which is NOT correct.
A. grounding rings are used which are removed only when it is wired securely into the circuit
B. it is inserted into conducting sponge during transit
C. only source terminal is earthed during transit
D. back-to-back Zener diodes are formed into the monolithic structure of the MOSFET.
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18. The input gate current of a FET is
A. a few microamperes
B. negligibly small
C. a few milliamperes
D. a few amperes
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19. For enhancement-only N-channel MOSFET, polarity of V
A. negative
B. positive
C. zero
D. dependent on the application of the device
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20. Regatding application of dual-gate FET, which statement is false?
A. it is ideal for mixer applications in communication receivers
B. it cannot be used in colour TV and stereo FM demodulators
C. it is used for AGC-driven IF amplifiers
D. due to its two independent gates, it has minimum cross modulation
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21. For the operation of enhancement-only N-channel MOSFET, value of gate voltage has to be
A. high positive
B. high negative
C. low positive
D. zero
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