Short notes
Objective questions (Answers are given below)
- The dc load line of a transistor circuit
(a) has a negative slope
(b) is a curved line
(c) gives graphic relation between IC and
IB
(d) does not contain the Q-point. - The positive swing of the output signal in a
transistor circuit starts clipping first when Qpoint
of the circuit moves
(a) to the centre of the load line
(b) two-third way up the load line
(c) towards the saturation point
(d) towards the cut-off point. - To avoid thermal run away in the design of
analog circuit, the operating point of the BJT
should be such that it satisfies the condition
(a) VCE = 1/2 VCC
(b) VCE < 1/2 VCC (c) VCE > 1/2 VCC
(d) VCE < 0.78 VCC - In the case of a BJT amplifier, bias stability is
achieved by
(a) keeping the base current constant
(b) changing the base current in order to
keep the ICand VCB constant
(c) keeping the temperature constant
(d) keeping the temperature and the base
current constant - For a transistor amplifier with self-biasing
network, the following components are
used :
R1 = 4 k Ω, R2 = 4 k Ω and RE = 1 k Ω
the approximate value of the stability
factor ‘S’ will be
(a) 4
(b) 3
(c) 2
(d) 1.5 - A transistor circuit employing base bias with
collector feedback has greater stability than
the one without feedback because
(a) IC decrease in magnitude
(b) VBE is decreased
(c) of negative feedback effect
(d) IC becomes independent of β. - The universal bias stabilization circuit is most
popular because
(a) IC does not depend on transistor
characteristics
(b) its β-sensitivity is high
(c) voltage divider is heavily loaded by
transistor base
(d) IC equals IE. - Improper biasing of a transistor circuit leads
to
(a) excessive heat production at collector
terminal
(b) distortion in output signal
(c) faulty location of load line
(d) heavy loading of emitter terminal. - The negative output swing in a transistor circuit
starts clipping first when Q-point
(a) has optimum value
(b) is near saturation point
(c) is near cut-off point
(d) is in the active region of the load line. - When a BJT is employed as an amplifier, it
operates
(a) in cut-off
(b) in saturation
(c) well into saturation
(d) over the active region
- Which of the following method used for biasing
a BJT in integrated circuits is considered
independent of transistor beta?
(a) fixed biasing
(b) voltage divider bias
(c) collector feedback bias
(d) base bias with collector feedback.
- (a) 2. (d) 3. (c) 4. (a) 5. (b) 6. (b) 7.(a) 8. (b) 9. (b) 10. (d) 11. (b)
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