Vellore institute of Technology Engineering Entrance Exam (VITEEE) 2012 Exam For Admissions on B.Tech., B.Tech. Bioinformatics, Bio-Medical Engineering and Biotechnology programmes

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Radar waves are sent towards a moving aeroplane and the reflected waves are received. When the aeroplane is moving towards the radar, the wavelength of the wave:
(a) decreases
(b) increases
(c) remains the same
(d) sometimes increases or decreases

The output stage of a television transmitter is most likely to be a:
(a) plate-modulated class C amplifier
(b) grid-modulated class C amplifier
(c) screen-modulated class C amplifier
(d) grid-modulated class A amplifier

The antenna current of an AM transmitter is A when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Find the percentage modulation.

(a) 60.1% (b) 70.1%
(c) 80.1% (d) 50.1%

The temperature coefficient of a zener mechanism is
(a) negative (b) positive
(c) infinity (d) zero

The epoxied ring consists of which of the following:
(a) three membered ring with two carbon and one oxygen
(b) four membered ring with three carbon and one oxygen
(c) five membered ring with four carbon and one oxygen
(d) six membered ring with five carbon and one oxygen