CET Test Equipment and Measurements 1 â Questions and Answers
Question 1: What does the vertical axis of an oscilloscope display represent?
- Time (seconds/division)
- Voltage (volts/division) (Correct answer)
- Frequency (Hz/division)
- Current (amps/division)
Correct answer: Voltage (volts/division)
The vertical axis of an oscilloscope represents voltage amplitude, calibrated in volts per division.
Question 2: When measuring resistance with a digital multimeter, what must be done before taking a reading?
- Apply power to the circuit under test
- Short the test leads and zero the meter
- Disconnect the circuit from its power source (Correct answer)
- Set the meter to the lowest resistance range
Correct answer: Disconnect the circuit from its power source
Resistance measurements must be taken with the circuit de-energized to prevent meter damage and obtain accurate readings.
Question 3: What is the standard output impedance of most RF signal generators used in electronics labs?
- 10 ohms
- 50 ohms (Correct answer)
- 300 ohms
- 600 ohms
Correct answer: 50 ohms
Most RF signal generators have a standard 50-ohm output impedance to match the characteristic impedance of common RF coaxial transmission lines.
Question 4: A function generator can typically produce which combination of waveform types?
- Sine waves only
- Square waves only
- Sine, square, and triangle waves (Correct answer)
- DC and pulsed signals only
Correct answer: Sine, square, and triangle waves
A function generator produces multiple waveform shapesâincluding sine, square, and triangle wavesâfor testing electronic circuits.
Question 5: What does an LCR meter primarily measure?
- Voltage, current, and resistance
- Inductance, capacitance, and resistance (Correct answer)
- Length, capacitance, and reactance
- Load, current, and rated power
Correct answer: Inductance, capacitance, and resistance
An LCR meter measures inductance (L), capacitance (C), and resistance (R) of passive electronic components.
Question 6: Which instrument is best suited for capturing and displaying multiple simultaneous digital logic signals?
- Analog oscilloscope
- Spectrum analyzer
- Logic analyzer (Correct answer)
- Signal generator
Correct answer: Logic analyzer
A logic analyzer is specifically designed to capture many digital channels simultaneously, making it ideal for debugging digital logic and bus protocols.
Question 7: What is the primary purpose of a spectrum analyzer?
- To display voltage versus time waveforms
- To measure signal amplitude versus frequency (Correct answer)
- To generate test signals at precise frequencies
- To measure component resistance and capacitance
Correct answer: To measure signal amplitude versus frequency
A spectrum analyzer displays signal amplitude across a range of frequencies, providing a frequency-domain view of the signal.
CET Test Equipment and Measurements 1
What does the vertical axis of an oscilloscope display represent?