# Electrical Measurements Questions and Answers – Oscilloscope

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Oscilloscope”.

1. CRO stands for __________
a) Cathode Ray Oscilloscope
b) Current Resistance Oscillator
c) Central Resistance Oscillator
d) Capacitance Resistance Oscilloscope

Explanation: Cathode Ray Oscilloscope (C.R.O) is basically used for the measurement of the amplitude of periodic and non periodic signals as a function of time.

2. C.R.O gives __________
a) actual representation
b) visual representation
c) approximate representation
d) incorrect representation

Explanation: Cathode Ray Oscilloscope is used as universal laboratory equipment. It provides a visual representation of time varying signals. It is an important equipment in the development of electronic circuits.

3. Oscilloscope is __________
a) a ohmmeter
b) an ammeter
c) a voltmeter
d) a multimeter

Explanation: Oscilloscope is basically a voltmeter. It employs the movement of an electronic gun assembly with respect to a fluorescent screen. The screen produces the movement of the visible spot.

4. Electron beam is deflected in __________
a) 1 direction
b) 4 directions
c) 3 directions
d) 2 directions

Explanation: The electron beam in an oscilloscope can be deflected in two directions, namely the horizontal (x-direction) and the vertical (y-direction). Two dimensional displays are produced as a result.

5. CRO is a __________
a) fast x-y plotter
b) slow x-y plotter
c) medium x-y plotter
d) not a plotter

Explanation: CRO is basically a fast x-y plotter. The x and y axes can be used to understand the variation in the magnitude of one voltage with respect to another voltage signal.

6. CRO can’t display microseconds time.
a) True
b) False

Explanation: CRO is a fast x-y plotter and displays periodic signals with time periods of the order of a few microseconds and even nanoseconds.

7. CRT is the heart of CRO.
a) True
b) False

Explanation: CRT stands for Cathode Ray Tube. It generates electron beam, accelerates and deflects the beam. It thus forms the heart of the CRO.

8. Typically oscilloscope represents __________
a) current and time
b) resistance and time
c) voltage and time
d) power and time

Explanation: In an oscilloscope typically the horizontal or x-axis represents the time while the vertical or y-axis represents the variation in the magnitude of the input signal.

Sanfoundry Global Education & Learning Series – Electrical Measurements.