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24%20-%20Solids%20and%20Semi-conductor%20Devices

# 24%20-%20Solids%20and%20Semi-conductor%20Devices - 24...

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24 - SOLIDS AND SEMI-CONDUCTOR DEVICES Page 1 ( Answers at the end of all questions ) 1 ) In a common base amplifier, the phase difference between the input signal voltage and output voltage is ( a ) π ( b ) π / 4 ( c ) π / 2 ( d ) zero [ AIEEE 2005 ] 2 ) In a full wave rectifier, circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be 3 ) When npn transistor is used as an amplifier 4 ) For a transistor amplifier in common emitter configuration for load impedance of 1 K ( h fe = 50 and h oe = 25 µ A / V ), the current gain is 5 ) A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ( a ) each of these increases ( b ) each of these decreases ( c ) copper strip increases and that of germanium decreases ( d ) copper strip decreases and that of germanium increases [ AIEEE 2004, 2003 ] 6 ) The menifestation of band structure in solids is due to

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