When n-type semiconductor is heated
number of electrons increases while that of holes decreases
number of electrons and holes remain same
number of electrons and holes increases equally
Radio waves of constant amplitude can be generated with
FET
filter
rectifier
oscillator
The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
In a junction diode, the holes are due to
protons
extra electrons
neutrons
missing electrons
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
zero
To obtain a p-type germanium semiconductor, it must be doped with
phosphorus
indium
antimony
arsenic
emitter
base
collector
Any of the above depending upon the nature of transistor.
A semiconducting device is connected in a series in circuit with a battery and a resistance. A current is allowed to pass through the circuit. If the polarity of the battery is reversed, the current drios to almost zero. The device may be
a p-n junction
an intrinsic semiconductor
a p-type semiconductor
an n-type semiconductor
Transistors are
electrons - sensitive device
pressure - sensitive device
holes - sensitive device
temperature - sensitive device
The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1kΩ. The peak value of the collector AC current for an AC input voltage of 0.01V peak is
100 μA
0.01 mA
0.25 mA
500 μA
