Acceptor and donor impurities donate:
A. n-carriers only
B. p-carriers only
C. p-carriers and n-carriers respectively
D. n-carriers
In forward bias the width of potential barrier:
A. Increases
B. Decreases
C. Remains same
D. No effect
The working of transistor as amplifier is similar to:
A. Step up transformer
B. Step down transformer
C. Three diodes in common
D. Triode vacuum tube
Non-inverting amplifier circuits have:
A. A very high input impedance
B. A very low input impedance
C. A low output impedance
D. None of the above
The operation of a transistor requires:
A. That the emitter be heated
B. That the base be heated
C. That the collector be heated
D. None of the above
The alternating voltage is an example of:
A. A digital waveform
B. An analogue waveform
C. Discrete waveform
D. None at all
The device used for conversion of D.C. to A.C. is called:
A. Converter
B. A rectifier
C. Inverter
D. Oscillator
In the transistor schematic symbol, the arrow:
A. is located on the emitter
B. is located on the base
C. is locate on the collector
D. points form north to south
Which one of the following is not a donor impurity:
A. antimony
B. phosphorus
C. aluminium
D. arsenic
Forward current through a semi conductor diode circuit is due to:
A. minority carriers
B. majority carriers
C. holes
D. electron
