# Electrical Measurements Questions and Answers – Applications of CRO

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

1. CRO is used for measurement of __________
a) AC as well as DC current
b) AC current only
c) DC current only
d) AC power only

Explanation: A Cathode Ray Oscilloscope is used for the measurement of AC as well as DC current. It is used for the calculation peak to peak voltage, r.m.s value, duty cycle, etc.

2. CRO is used in a radar for __________
a) studying the pattern of flights
b) visualizing a target
c) measuring voltage
d) determining the distance between source and destination

Explanation: A Cathode Ray Oscilloscope is used in a radar for visualizing a target such as an aeroplane, ship, etc.

3. In radio applications, CRO is used for measuring __________
a) audio frequency range
b) a narrow range of frequencies
c) a wide range of frequencies
d) radio frequency range

Explanation: By making use of a Cathode Ray Oscilloscope, a wide range of frequencies can be measured. The radio frequency, audio frequency and intermediate frequency signals can be measured by making use of a CRO.

4. In medical applications CRO can be used for __________
a) measuring the heart beats
b) monitoring the brain
c) improving the nervous system functioning
d) displaying cardiograms

Explanation: A Cathode Ray Oscilloscope, can be used in medical applications for displaying cardiograms. Cardiograms are used for diagnosing the condition of heart of a patient. Electromyograms are used for studying the condition of a patient’s muscle.

5. CRO is used for many purposes in the industry.
a) True
b) False

Explanation: A Cathode Ray Oscilloscope, is used for observing B-H curves, P-V diagrams, etc. A CRO is also used in various transducers for the measurement of strain, pressure and temperature.
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6. A CRO can’t be used in transmission lines.
a) True
b) False

Explanation: A Cathode Ray Oscilloscope, is used in transmission lines for the measurement of modulation characteristics. It is also used for detecting the standing waves in a transmission line.

7. Curve tracers use CRO in __________
a) diodes
b) passive devices
c) active devices
d) op amps

Explanation: Curve tracers in a Cathode Ray Oscilloscope are used for testing active devices such as vacuum tubes, transistors and integrated circuits.

8. A CRO is used in check __________
a) op amps
b) resistors
c) voltage
d) capacitance, inductance and diodes

Explanation: A Cathode Ray Oscilloscope is used for checking diodes. It is also used in the measurement of inductances and capacitances. A CRO can also be used for detecting the faults in a circuit.

9. A CRO is used in labs for __________
a) frequency measurement
b) voltage measurement
c) current measurement
d) resistance measurement

Explanation: A Cathode Ray Oscilloscope is used in the laboratory for the measurement of frequency, phase and period of a signal. Periodic as well as non-periodic relationships of signals can also be studied.

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