Q21. The pulse width out of a one shot multivibrator increases when the
(a) supply voltage increases
(b) timing resistor decreases
(c) UTP decreases
(d) Timing capacitances increases
Q22. In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the
(a) value of the RC timing components
(b) amplitude of the input trigger
(c) frequency of the input trigger
(d) magnitude of the dc supply voltage
Q23. One shot multivibrator, with a pulse input gives an output:
(a) a single triangular pulse
(b) a square pulse
(c) an impulse
(d) a single sinusoid pulse
Q24. Trigger pulses are essential for the opertion of a bistable multivibrator because
(a) there are no R-C timing circuits
(b) the circuit cannot switch between its two states automatically
(c) transistor operation is controlled by the triggering pulses
(d) all of the above
Q25. It is required to strech a 5 μs pulse to a duration of 5 ms. An appropriate circuit to be used for this is
(a) monostable multivibrator
(b) astable multivibrator
(c) bistable multivibrator
(d) schmitt trigger
Q26. The type of multivibrator used for generation of clock pulses is
(a) monostable multivibrator
(b) astable multivibrator
(c) bistable multivibrator
(d) none of these
Q27. A schmitt trigger is basically
(a) a monostable multivibrator
(b) an astable multivibrator
(c) a bistable multivibrator
(d) an oscillator
Q28. A schmitt trigger converts slowly varying waveform into
(a) sinewave
(b) sawtooth wave
(c) triangular wave
(d) square wave
Q29. Narrow pulses with adjustable mark to space ratio can be obtained from square wave input signal by using which of the following?
(1) schmitt trigger
(2) monostable multivibrator
(3) clippers
Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) 1 and 2
(d) 2 and 3
Q30. Consider the following statements.
From a sine wave one can obtain square wave by using
(1) schmitt trigger circuit
(2) zero crossing detector
(3) clippers and amplifiers
Select the correct answer using the code given below:
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 1, 2 and 3
