Download Test No 1 Physics Semi Conductor

TEST NO. 1
1. What is the order of energy gap in a semiconductor?
(1)
2. How does the conductivity of a semiconductor change with temperature
(1)
3. What is the net charge on p-type and n-type semiconductors?
(1)
4. Why are elemental dopants for Silicon or Germanium usually chosen from
(1)
group 13 or group 15?
5. With the help of circuit diagrams, distinguish between forward biasing
(2)
and reversing biasing of a pn-junction diode
6. What happens to the width of depletion layer of a pn-junction when it is
i)
Forward biased
(2)
ii) reversed biased
7. Draw a circuit diagram of a full wave rectifier. Draw the input/output
(2)
Wave forms indicating clearly the functions of the two diodes used.
8. Draw the circuit diagram to study the characteristics of n-p-n transistor
(3)
in common emitter configuration. Sketch
i)
Input characteristics
ii)
output characteristics
9. Draw the circuit diagram of a common emitter amplifier using n-p-n
transistor. What is the phase difference between input signal and output
(2)
(3)
(2)
voltage? Draw the input and output waveforms of the signal.
TEST NO. 1
1. What is the order of energy gap in a semiconductor?
(1)
2. How does the conductivity of a semiconductor change with temperature
(1)
3. What is the net charge on p-type and n-type semiconductors?
(1)
4. Why are elemental dopants for Silicon or Germanium usually chosen from
(1)
group 13 or group 15?
5. With the help of circuit diagrams, distinguish between forward biasing
(2)
and reversing biasing of a pn-junction diode
6. What happens to the width of depletion layer of a pn-junction when it is
ii)
Forward biased
(2)
ii) reversed biased
7. Draw a circuit diagram of a full wave rectifier. Draw the input/output
(2)
Wave forms indicating clearly the functions of the two diodes used.
8. Draw the circuit diagram to study the characteristics of n-p-n transistor
(3)
in common emitter configuration. Sketch
ii)
Input characteristics
ii)
output characteristics
9. Draw the circuit diagram of a common emitter amplifier using n-p-n
transistor. What is the phase difference between input signal and output
voltage? Draw the input and output waveforms of the signal.
(2)
(3)
(2)