This Portion of Electrical andElectronic Measurements and Measuring instruments contains Instruments for Generation of Waveforms MCQs (Multiple Choice Questions and Answers) / Objective Type Questions and Answers.

This Section covers below lists of topics.

1. Signal Sources
2. Oscillators
3. Feedback Oscillators
4. Beat Frequency Oscillators
5. Negative Resistance Oscillators
6. Square Wave and Pulse Generators
7. Pulse and Square Wave Circuits
8. Pulse Generator Circuits
9. Triangular Wave shape Generator Circuits
10. Frequency Synthesizers

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

#### 1. Which one of the following oscillators is used for generation of high frequencies?

• RC phase shift
• Wien bridge
• LC oscillator
• Blocking oscillator

#### 2. A triangular wave can be generated by

• integrating a square wave
• differentiating a square wave
• integrating a sine wave
• differentiating a sine wave

#### 3. Harmonic distortion is due to

• change in the behaviour of circuit elements due to change in temperature
• change in the behaviour of circuit elements due to change in environment
• linear behaviour of circuit elements
• nonlinear behaviour of circuit elements

#### 4. A spectrum analyser is a combination of

• narrow band super-heterodyne receiver and CRO
• signal generator and CRO
• oscillator and wave analyser
• VTVM and CRO

#### 5. A spectrum analyser is used across the frequency spectrum of a given signal to study the

• current distribution
• voltage distribution
• energy distribution
• power distribution

#### 6. The desirable characteristics of a signal source are :

• The frequency of the signal should be well known and stable
• The amplitude of a signal source should be controllable from very small to relatively large values
• The output signal should be free from distortion
• All the above

#### 7. In signal generators

• Energy is created
• Energy is generated
• Energy is converted from simple d.c. source into a.c energy at some specific frequency
• All the above.

#### 8. A video frequency oscillator has a frequency range of :

• 20 Hz to 20 kHz
• 20 kHz to 30 MHz
• D.c to 5 MHz.
• 2 MHz to 30 MHz.

• G/(1-GH)
• G/(1+GH)
• G/(1±GH)
• H/(1+ GH)

#### 10. In an RC phase shift oscillator having three stages which have equivalued resistors and capacitors, the amplifier, in order to satisfy, Barkhausen criteria should have a minimum gain of

• 6
• 29
• 31
• None of the above.

• 300 kΩ
• 225 kΩ
• 1 kΩ
• 15 kΩ.

#### 12. The pulse rise time is defined as the time taken by the pulse

• To go from 10% to 90% of its amplitude
• To go from 0% to 100% of its amplitude
• To go from 0% to 90% of its amplitude
• To go from 10% to 1005 of its amplitude.

#### 13. An astable multivibrator

• Gives one output pulse for every two input pulses
• Gives a timed output pulse for a trigger input
• Gives a train of output pulses for a trigger input
• Gives four output pulses for a single input pulse.

• 924 Hz
• 593 Hz
• 693 Hz
• 110 Hz

#### 15. A triangular wave shape is obtained :

• By integrating a square wave
• By differentiating a sine wave
• By differentiating a square wave
• By integrating a sine wave

#### 16. In a sweep frequency generator , two oscillators, one with frequency range of 3 GHz to 5 GHz is heterodyned with a second oscillator having a fixed frequency output of 3 GHz., the output frequency varies from

• 0 to 2 GHz.
• 6 GHz to 8 GHz.
• 0 to 3 GHz.
• 0 to 5 GHz.

#### 17. A random noise generator produces a signal

• Whose amplitude varies randomly
• Which has no periodic frequency
• Has unpredictable power spectrum
• All the above

#### 18. A voltage controlled oscillator(Vco) is an instrument

• Whose frequency is dependent upon the amplitude of input signal
• Whose frequency is independent of the amplitude of the input signal
• Whose frequency is dependent upon the frequency of the input signal
• None of the above.

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