1. The primary function of an oscilloscope is to:
A. Measure the current in a circuit
B. Display the waveform of an electrical signal
C. Measure voltage drop across a resistor
D. Measure resistance of a component
Answer: B. Display the waveform of an electrical signal
2. Which of the following parameters can be measured using an oscilloscope?
A. Frequency
B. Amplitude
C. Waveform shape
D. All of the above
Answer: D. All of the above
3. The vertical axis of an oscilloscope display typically represents:
A. Time
B. Voltage
C. Frequency
D. Current
Answer: B. Voltage
4. The horizontal axis of an oscilloscope display typically represents:
A. Voltage
B. Time
C. Current
D. Frequency
Answer: B. Time
5. When using an oscilloscope, what does the ‘time/div’ control adjust?
A. The vertical scaling (amplitude)
B. The horizontal scaling (time)
C. The intensity of the display
D. The frequency of the signal
Answer: B. The horizontal scaling (time)
6. What is the purpose of the ‘trigger’ feature in an oscilloscope?
A. To synchronize the waveform display
B. To change the time scale
C. To adjust the waveform’s amplitude
D. To measure the signal’s frequency
Answer: A. To synchronize the waveform display
7. Which of the following is the most common type of oscilloscope display?
A. Analog
B. Digital
C. Mixed-signal
D. LED
Answer: B. Digital
8. In an oscilloscope, what does the ‘volts/div’ control adjust?
A. The voltage reference for triggering
B. The vertical scaling (voltage amplitude)
C. The time reference for triggering
D. The horizontal scaling (time duration)
Answer: B. The vertical scaling (voltage amplitude)
9. Which of the following is used to probe the signal being measured in an oscilloscope?
A. A test lead
B. A probe
C. A capacitor
D. A multimeter
Answer: B. A probe
10. The ‘holdoff’ function in an oscilloscope helps to:
A. Stabilize the waveform
B. Remove noise from the signal
C. Delay the triggering event
D. Change the trigger level
Answer: C. Delay the triggering event
11. What does an oscilloscope display when measuring a pure DC signal?
A. A constant horizontal line
B. A sinusoidal wave
C. A square wave
D. A sawtooth wave
Answer: A. A constant horizontal line
12. In an oscilloscope, a signal with a frequency of 50 Hz will have a period of:
A. 50 ms
B. 100 ms
C. 200 ms
D. 20 ms
Answer: B. 100 ms
13. If the time/div setting of an oscilloscope is 1 ms and the signal occupies 4 divisions horizontally, the period of the signal is:
A. 1 ms
B. 4 ms
C. 0.25 ms
D. 0.5 ms
Answer: B. 4 ms
14. The function of an oscilloscope’s ‘XY mode’ is to:
A. Measure both voltage and current simultaneously
B. Display the relationship between two signals
C. Display a signal’s frequency response
D. Show a spectrum of frequencies
Answer: B. Display the relationship between two signals
15. When interpreting an oscilloscope display, a square wave indicates that the signal is:
A. A constant voltage
B. Changing polarity periodically
C. A random noise signal
D. A sinusoidal wave
Answer: B. Changing polarity periodically
16. Which of the following types of signals would an oscilloscope be least effective at measuring?
A. Sinusoidal signals
B. Square waves
C. Constant DC signals
D. DC ripple in power supplies
Answer: C. Constant DC signals
17. The maximum frequency that an oscilloscope can measure is determined by its:
A. Sampling rate
B. Time base
C. Voltage range
D. Input impedance
Answer: A. Sampling rate
18. What happens when an oscilloscope’s time/div setting is too large for a high-frequency signal?
A. The signal will appear as a very narrow spike
B. The signal will be displayed with a low resolution
C. The signal will be displayed as a sinusoidal wave
D. The signal will be shown as a straight line
Answer: B. The signal will be displayed with a low resolution
19. Which oscilloscope feature is used to stabilize a noisy signal or waveform?
A. Time base
B. Vertical scaling
C. Triggering
D. Voltage reference
Answer: C. Triggering
20. In an oscilloscope, what does the term ‘bandwidth’ refer to?
A. The range of frequencies the oscilloscope can accurately display
B. The time required to acquire a waveform
C. The amplitude range of the signal
D. The maximum voltage the oscilloscope can handle
Answer: A. The range of frequencies the oscilloscope can accurately display