In this section of Electronic Devices and Circuits.It contain Switching and Wave Shaping Circuits MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University level Exams.

This Section covers below lists of topics :

1. Switching and Wave Shaping Circuits MCQs.
2. Multivibrators,monostable, bistable MCQs.
3. Wave Shaping by Differentiating circuits MCQs
4. Wave Shaping by Integrating circuits MCQs
5. voltage multiplier MCQs
6. Clipping Circuits MCQs
7. Clamping circuits MCQs

Practice it now to sharpen your concept.

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

#### 1. While operating as a switch, transistor is

• Always in cut off state
• Always in saturation state
• Either in cut off or saturation state
• None of these

#### 2. The maximum speed of operation of an electronic switch is

• 5 operation /sec
• 10^9 operation /sec
• 100 operation /sec
• 1000 operation /sec

#### 3. A circuit that generates square wave is called

• An oscillator
• A multivibrator
• A modulator
• A differentiator

• One
• Two
• Three
• Four

#### 5. An RC series circuit can be used as an integrator when output a taken across

• Resistor R
• Capacitor C
• Either of the above
• None of these

#### 6. If a square wave is fed to a differentiating circuit, the output will be

• Sharp narrow pulses
• Triangular wave
• Saw tooth wave
• Sine wave

#### 7. A multivibrator that generates square wave of its own is called a

• Monostable multivibrator
• Bistable multivibrator
• Astable multivibrator
• None of these

#### 8. A relay is basically has

• Mechanical switch
• Electromechanical switch
• Electronic switch
• Tumbler switch

#### 9. A bistable multiplier is a circuit that

• No stable stage
• One stable state
• Two stable state
• One transistor to generate square wave

#### 10. A voltage multiplier is a circuit that

• Amplifies voltage
• Raises the peak input voltage to 2,3,4 times
• Changes the shape of input voltage
• None of these

#### 11. In a nonlinear op-amp circuit, the

• Op amp never saturates
• Feedback loop is never opened
• Output shape is the same as the input shape
• Op amp may saturate

#### 12. To detect when the input is greater than a particular value, use a

• Comparator
• Clamper
• Limiter
• Relaxation oscillator

#### 13. The voltage out of a Schmitt trigger is

• A low voltage
• A high voltage
• Either a low or a high voltage
• A sine wave

#### 14. Hysteresis prevents false triggering associated with

• A sinusoidal input
• Noise voltages
• Stray capacitances
• Trip points

#### 15. If the input is a rectangular pulse, the output of an integrator is a

• Sine wave
• Square wave
• Ramp
• Rectangular pulse

#### 16. When a large sine wave drives a Schmitt trigger, the output is

• Rectangular wave
• Triangular wave
• Rectified sine wave
• Series of ramps

#### 17. If pulse width decreases and the period stays the same, the duty cycle

• Decreases
• Stays the same
• Increases
• Is zero

• Sine wave
• Square wave
• Ramp
• Spike

• 1 uV
• 3.5 uV
• 7 uV
• 14 uV

• 0
• 4 V
• 8 V
• 16 V

• 0
• 2 Vpp
• 6 Vpp
• 8 Vpp

• 10 Hz
• 100 Hz
• 1 kHz
• 10 kHz

#### 23. A comparator with a trip point of zero is sometimes called a

• Threshold detector
• Zero-crossing detector
• Positive limit detector
• Half-wave detector

#### 24. To work properly, many IC comparators need an external

• Compensating capacitor
• Pullup resistor
• Bypass circuit
• Output stage

#### 25. A Schmitt trigger uses

• Positive feedback
• Negative feedback
• Compensating capacitors
• Pullup resistors

#### 26. A Schmitt trigger

• Is a zero-crossing detector
• Has two trip points
• Produces triangular output waves
• Is designed to trigger on noise voltage

#### 27. A relaxation oscillator depends on the charging of a capacitor through a

• Resistor
• Inductor
• Capacitor
• Noninverting input

#### 28. A ramp of voltage

• Always increases
• Is a rectangular pulse
• Increases or decreases at a linear rate
• Is produced by hysteresis

#### 29. The op-amp integrator uses

• Inductors
• The Miller effect
• Sinusoidal inputs
• Hysteresis

#### 30. The trip point of a comparator is the input voltage that causes

• The circuit to oscillate
• Peak detection of the input signal
• The output to switch states
• Clamping to occur

#### 31. In an op-amp integrator, the current through the input resistor flows into the

• Inverting input
• Noninverting input
• Bypass capacitor
• Feedback capacitor

#### 32. An active half-wave rectifier has a knee voltage of

• VK
• 0.7 V
• More than 0.7 V
• Much less than 0.7 V

#### 33. In an active peak detector, the discharging time constant is

• Much longer than the period
• Much shorter than the period
• Equal to the period
• The same as the charging time constant

#### 34. If the reference voltage is zero, the output of an active positive limiter is

• Positive
• Negative
• Either positive or negative
• A ramp

#### 35. The output of an active positive clamper is

• Positive
• Negative
• Either positive or negative
• A ramp

#### 36. The positive clamper adds

• A positive dc voltage to the input
• A negative dc voltage to the input
• An ac signal to the output
• A trip point to the input

#### 37. A window comparator

• Has only one usable threshold
• Uses hysteresis to speed up response
• Clamps the input positively
• Detects an input voltage between two limits
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