UNIT
– II 2-Marks Questions
1. Differentiate
oscillator and amplifier. [Nov. 2013]
2. Mention
two essential conditions for a circuit to maintain oscillations. [April 2010] [Nov. 2011] [May 2012]
3. State
the Barkhausen criterion for sustained oscillation. What will happen to the
oscillations if the magnitude of the loop gain is greater than unity? [Nov.
2013]
4. In
a Hartley oscillator, if L1 = 0.2 mH, L2 = 0.3mH and
C=0.003 µF, calculate the frequency of its oscillations. [May 2012] [Nov 2012]
5. Draw
the feedback circuit of a Colpitts oscillator.
Obtain the value of the equivalent series capacitance required if it
uses a L of 100 mH and is to oscillate at 40 KHz. [May 2013]
6. A
tuned collector oscillator in a radio receiver has a fixed inductance of 60 µH
and has to be tunable over the frequency band of 400 KHz to 1200 KHz. Find the range of variable capacitor to be
used. [April 2011] [Nov. 2011]
7. In
a RC phase shift oscillator, if R1=R2=R3=200
KΩ and C1=C2=C3= 100 pF, find the frequency of
the oscillator. [April 2010]
8. In
an RC phase shift oscillator, if the frequency of oscillation is 955 Hz and R1=R2=R3=
680 KΩ. Find the value of capacitors. [Nov. 2010]
9. A
Wienbridge oscillator is used for operations at 9 KHz. If the value of the resistance R is 100 KΩ,
what is the value of C required? [April
2011]
10. What
is the necessary condition for a Wien bridge oscillator circuit to have
sustained oscillations? [May 2013]
11. What
is the major disadvantage of a Twin-T oscillator? [Nov 2012]
12. A
crystal has the following parameters h=0.05 H, C=0.05 pF and mounting
capacitance is 2 pF. Calculate its series and parallel resonating frequencies.
[Nov. 2010]
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