1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
When $$npn$$ transistor is used as an amplifer
A
electrons move from collector to base
B
holes move from emitter to base
C
electrons move from base to collector
D
holes move from base to emitter
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega $$ $$\left( {{h_{fe}} = 50} \right.$$ and $$\left. {{h_{oe}} = 25} \right)$$ the current gain is
A
$$-24.8$$
B
$$-15.7$$
C
$$-5.2$$
D
$$-48.78$$
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
A piece of copper and another of germanium are cooled from room temperature to $$77K,$$ the resistance of
A
copper increases and germanium decreases
B
each of them decreases
C
each of them increases
D
copper decreases and germanium increases
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The manifestation of band structure in solids is due to
A
Bohr's correspondence principle
B
Pauli's exclusion principle
C
Heisenberg's uncertainty principle
D
Boltzmann's law
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