GATE 2018 Electronics and Communication Engineering (EC) Question Paper and answer

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GATE 2018 Electronics and Communication Engineering (EC) solved Question Paper

1.The Nyquist stability criterion and the Routh criterion both are powerful analysis tools for
determining the stability of feedback controllers. Identify which of the following statements
is FALSE:
(A) Both the criteria provide information relative to the stable gain range of the system.
(B) The general shape of the Nyquist plot is readily obtained from the Bode magnitude plot
for all minimum-phase systems.
© The Routh criterion is not applicable in the condition of transport lag, which can be
readily handled by the Nyquist criterion.
(D) The closed-loop frequency response for a unity feedback system cannot be obtained
from the Nyquist plot.

2.In a p-n junction diode at equilibrium, which one of the following statements is
NOT TRUE?
(A) The hole and electron diffusion current components are in the same direction.
(B) The hole and electron drift current components are in the same direction.
© On an average, holes and electrons drift in opposite direction.
(D) On an average, electrons drift and diffuse in the same direction.

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