ISCET Test Equipment and Measurement 2

Question 1

When using an oscilloscope to measure a signal, the timebase is set to 2 ms/div and you count 4 divisions for one complete cycle. What is the frequency of the signal?

Accepted Answer

125 Hz

Answer

250 Hz

Answer

500 Hz

Answer

1 kHz

Question 2

A clamp-on ammeter measures current by sensing which electrical property?

Accepted Answer

The magnetic field surrounding the conductor

Answer

Voltage drop across a shunt resistor

Answer

Resistance of the wire insulation

Answer

Capacitance between the clamp jaws

Question 3

On a spectrum analyzer, the resolution bandwidth (RBW) setting primarily controls which display characteristic?

Accepted Answer

The ability to distinguish two closely spaced signals

Answer

The vertical amplitude scale

Answer

The sweep time across the full span

Answer

The reference level at the top of the display

Question 4

Which DMM function would you select to test whether a diode junction is forward-biased and intact?

Accepted Answer

Diode test mode

Answer

DC voltage

Answer

Resistance (Ω)

Answer

Capacitance

Question 5

A signal generator's output impedance is specified at 50 Ω. To avoid reflections and achieve maximum power transfer to the load, the load impedance should be:

Accepted Answer

50 Ω

Answer

As high as possible (open circuit)

Answer

0 Ω (short circuit)

Answer

100 Ω

Question 6

When an oscilloscope probe is switched to the ×10 position, how does this affect the observed waveform amplitude compared to ×1?

Accepted Answer

The displayed amplitude appears 10 times smaller

Answer

The displayed amplitude appears 10 times larger

Answer

The amplitude is unchanged but bandwidth increases

Answer

The amplitude doubles and noise decreases

Question 7

Which instrument is best suited to measure the total harmonic distortion (THD) of an audio amplifier output?

Accepted Answer

Spectrum analyzer or distortion analyzer

Answer

Digital multimeter

Answer

Oscilloscope only

Answer

LCR meter