Pulse and Digital Circuits Mid - I, February - 2012

1.The waveform which preserves its form when transmitted through a linear network is a ___________.
  • Sine wave
  • Step signal
  • impulse signal
  • ramp signal
Answer: B
2.An RC high pass circuit has R= 1kΩ and C=0.5 μF. Its lower cutoff frequency is
  • zero
  • 318.3 Hz
  • 1kHz
  • infinity
Answer: B
3.A clipping circuit consists of ___________.
  • Resistor
  • Diode
  • both a and b
  • c and capacitor
Answer: C
4.For a integrator, if input is square wave then the output waveform is _____
  • Impulse
  • Sawtooth wave
  • Triangular wave
  • Both a and c
Answer: A
5.Gain of integrator ________ with frequency.
  • decreases
  • increases
  • both a and b
  • no change
Answer: C
6.A clamping circuit is also called as ____________.
  • dc restorer
  • dc reinserter
  • both a and b
  • none of the above
Answer: C
7.A sinusoidal waveform can be converted to a square waveform by using _______
  • Astable multivibrator
  • Bistable multivibrator
  • Schmitt trigger
  • None of the above
Answer: C
8.A Schmitt trigger is a __________.
  • counter
  • Voltage to frequency converter
  • Comparator
  • None of the above
Answer: A
9.A ringing circuit has a quality factor Q=24. This circuit will ring for how many number of cycles?
  • 24
  • 12
  • 8
  • 6
Answer: C
10.The rise time of the output of a low pass RC circuit is given by
  • 2.2 RC
  • 0.35/fH
  • 2.2τ
  • all the above
Answer: C
11._____________ is the condition for an RC high pass circuit to acts as a differentiator.
Answer: Ringing circuit
12.Time constant of RL circuit is ____________.
Answer: L/R
13.Write the clamping circuit theorem ________________
Answer: 0
14.Rise time of a Low pass filter is ________________________.
Answer: Af / Ar = Rf / Rr
15.The time constant of a monostable multivibrator is __________________.
Answer: 2.2τ = 2.2RC = 0.35/f2
16._____________ is called as a free running oscillator.
Answer: 1.1RC
17.A bistable multivibrator is used for ____________________.
Answer: 0.5MHz
18._______________ circuit is used to generate the sequence of pulses which are regularly spaced in time.
Answer: % P = (T/2τ)x 100% where τ is time constant
19.The process of converting pulses into spikes is called _____________.
Answer: Tilt
20.Write the relationship between time constant and tilt?
Answer: Linear wave shaping