CRO & Oscilloscopes MCQs

Practice CRO & Oscilloscopes MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Measurements & InstrumentationCRO & Oscilloscopes

In a conventional CRO, the vertical deflection system is primarily used to represent?

ASignal amplitude
BTime only
CPower factor only
DFrequency counter output only

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Correct Answer: A. Signal amplitude

Explanation: The input signal is normally applied to the vertical channel, so vertical displacement represents instantaneous signal voltage.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 2

Measurements & InstrumentationCRO & Oscilloscopes

The time-base generator of a CRO normally produces a?

ASawtooth waveform
BPure DC level
CSquare-law current only
DRandom waveform

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Correct Answer: A. Sawtooth waveform

Explanation: A sawtooth or ramp voltage sweeps the electron beam horizontally at an approximately uniform rate.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 3

Measurements & InstrumentationCRO & Oscilloscopes

If one cycle of a waveform occupies 4 horizontal divisions at 0.5 ms/div, its period is?

A0.5 ms
B1 ms
C2 ms
D4 ms

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Correct Answer: C. 2 ms

Explanation: T=4 divisions × 0.5 ms/div = 2 ms.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 4

Measurements & InstrumentationCRO & Oscilloscopes

A waveform has a period of 2 ms. Its frequency is?

A50 Hz
B200 Hz
C500 Hz
D2 kHz

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Correct Answer: C. 500 Hz

Explanation: f=1/T=1/0.002=500 Hz.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 5

Measurements & InstrumentationCRO & Oscilloscopes

A sine wave measures 6 vertical divisions peak-to-peak on a CRO set to 2 V/div. Its peak-to-peak voltage is?

A3 V
B6 V
C12 V
D24 V

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Correct Answer: C. 12 V

Explanation: Vpp=6 divisions × 2 V/div = 12 V.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 6

Measurements & InstrumentationCRO & Oscilloscopes

For a 12 V peak-to-peak sine wave, the peak value is?

A3 V
B6 V
C8.49 V
D12 V

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Correct Answer: B. 6 V

Explanation: For a symmetrical sine wave, Vp=Vpp/2=6 V.

Reference: Standard measurements and instrumentation: cro & oscilloscopes

Question 7

Measurements & InstrumentationCRO & Oscilloscopes

For a sinusoid with peak value 10 V, the RMS value is approximately?

A5 V
B7.07 V
C10 V
D14.14 V

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Correct Answer: B. 7.07 V

Explanation: For a sine wave, Vrms=Vp/√2≈10/1.414=7.07 V.

Reference: Standard measurements and instrumentation: cro & oscilloscopes