Pulse and Digital Circuits Mid - I, September - 2014

1.Which of the following devices are used for the purpose of switching
  • Linear wave shaping
  • Non-linear wave shaping
  • both a and b
  • None
Answer: B
2.In a clamping circuit the forward and reverse resistance of the diode used respectively is 100Ω and 120KΩ. The value of R across the diode is
  • 60.05 KΩ
  • 3.464KΩ
  • 12MΩ
  • 100KΩ
Answer: B
3.For producing an identical delayed pulse, we should use a
  • For producing an identical delayed pulse, we should use a
  • Bistable multivibrator
  • Monostable multivibrator
  • all
Answer: A
4.In a clamping circuit the value of R across the diode is
  • The geometric mean of the forward and reverse resistance of that diode
  • The arithmetic mean of the forward and reverse resistance of that diode
  • The harmonic mean of the forward and reverse resistance of that diode
  • The product of the forward and reverse resistance of that diode
Answer: A
5.The response of the RC differentiator for the ramp input Vi = αt is …………………..
  • RC
  • αC
  • αR
  • αRC
Answer: D
6.The response of step input to a low pass RC circuit is ……………………….
  • V e-t/Rc
  • V(1-et/RC)
  • V et/RC
  • V(1-e-t/RC)
Answer: D
7.The frequency of oscillation of astable multivibrator with R1 = R2 = 1KΩ, C1 = C2 = 1μF is
  • (1/1.38)kHz
  • 1.38KHz
  • (1/38)Hz
  • 13.8Hz
Answer: A
8.The clamping theorem is given by …………………….
  • Af/Ar = Rf/R
  • Af/Ar = Rf/Rr
  • Af/Ar = Rf x R
  • Af/Ar = 1
Answer: A
9.The time required for the collector current to rise to 10% of its maximum value in a transistor switch is called ............................
  • Delay time
  • Fall time
  • On time
  • Off time
Answer: C
10.A comparator is a basic building block in a system used to analyze the ………… distribution of noise generated in active device.
  • Frequency
  • phase
  • Amplitude
  • all
Answer: C
11.The process whereby the form of a non-sinusoidal signal is altered by transmission through a linear network is called ………………………….
Answer: Linear wave shaping
12.The process of converting pulses into spikes by means of a low time constant is called …........................
Answer: Peaking
13.Clippers are also known as …………………………………..
Answer: Limiters or amplitude selectors or slicers
14.Pulse width of a collector coupled monostable multivibrator is given by …………….
Answer: T = 0.69RC
15.……………………… are circuits which are used to fix the extremity of a periodic waveform to some constant reference level.
Answer: Clamping circuits
16.A circuit which has only one permanently stable and one quasi stable is called ………….
Answer: Univibrator
17.A waveform which is zero for t < 0 and which increases linearly with time for t > 0 is called a ………………………..
Answer: Ramp or sweep voltage
18.The RLC circuit which gives nearly undamped oscillations is called ……………………..
Answer: Ringing circuit
19.The time required for a capacitive circuit to reach its steady state or final voltage can be specified as ……………………..
Answer: Time constant
20.The smallest time between two successive triggers is ...........................
Answer: Restoring time