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
0.29 mA
0.35 mA
0.39 mA
0.43 mA
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
The correct relationship between the two current gains and in a transistor is
Radiowaves of constant amplitude can be generated with
FET
filter
rectifier
oscillator
At absolute zero, Si acts as
non-metal
metal
insulator
None of these
In a junction diode, the holes are due to
protons
extra electrons
neutrons
missing electrons
When arsenic is added as an impurity to silicon, the resulting material is
n-type semiconductor
p-type semiconductor
n-type conductor
NAND
OR
AND
XOR
Which of the following when added as an impurity into silicon produces n-type semiconductor?
P
Al
B
Mg
