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WorksheetsElectronics
Total questions: 25
Worksheet time: 8mins
A transistor has …………………
one pn junction
two pn junctions
three pn junctions
four pn junctions
The number of depletion layers in a transistor is …………
four
three
one
two
The base of a transistor is ………….. doped
heavily
moderately
lightly
none of the above
The element that has the biggest size in a transistor is ………………..
collector
base
emitter
collector-base-junction
In a pnp transistor, the current carriers are ………….
acceptor ions
donor ions
free electrons
holes
The collector of a transistor is …………. doped
heavily
moderately
lightly
none of the above
A transistor is a …………… operated device
current
voltage
both voltage and current
none of the above
In a npn transistor, ……………. are the minority carriers
free electrons
holes
donor ions
acceptor ions
The emitter of a transistor is ………………… doped
lightly
heavily
moderately
none of the above
In a transistor, the base current is about ………….. of emitter current
25%
20%
35 %
5%
At the base-emitter junctions of a transistor, one finds ……………
a reverse bias
a wide depletion layer
low resistance
none of the above
The input impedance of a transistor is ………….
high
low
very high
almost zero
Most of the majority carriers from the emitter ………………..
recombine in the base
recombine in the emitter
pass through the base region to the collector
none of the above
The value of α of a transistor is ……….
more than 1
less than 1
1
none of the above
The output impedance of a transistor is ……………..
high
zero
low
very low
The relation between β and α is …………..
β = 1 / (1 – α )
β = (1 – α ) / α
β = α / (1 – α )
β = α / (1 + α )
The value of β for a transistor is generally ………………..
1
less than 1
between 20 and 500
above 500
The most commonly used transistor arrangement is …………… arrangement
common emitter
common base
common collector
none of the above
The input impedance of a transistor connected in …………….. arrangement is the highest
common emitter
common collector
common base
none of the above
The output impedance of a transistor connected in ……………. arrangement is the highest
common emitter
common collector
common base
none of the above
The voltage gain in a transistor connected in ………………. arrangement is the highest
common base
common collector
common emitter
none of the above
As the temperature of a transistor goes up, the base-emitter resistance ……………
decreases
increases
remains the same
none of the above
The voltage gain of a transistor connected in common collector arrangement is ………..
equal to 1
more than 10
more than 100
less than 1
BC 147 transistor indicates that it is made of …………..
germanium
silicon
carbon
none of the above
The arrow in the symbol of a transistor indicates the direction of ………….
electron current in the emitter
electron current in the collector
hole current in the emitter
donor ion current
