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Semiconductor devices

At room temperature the current in an intrinsic semiconductor is due to
Holes
Electrons
ions
Holes and electrons
Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface. A. True
True
False
The most commonly used semiconductor material is
Silicon
germanium
Mixture of silicon and germanium
None of the above
In which of these is reverse recovery time nearly zero?
Zener diode
Tunnel diode
Schottky diode
PIN diode
A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
100
99
1.01
0.99
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