CCT CCT Electrical & Electronic Calibration

Question 1

Which instrument is used as the primary reference for calibrating digital multimeters in an electrical calibration lab?

Accepted Answer

Multifunction calibrator

Answer

Oscilloscope

Answer

Signal generator

Answer

Power supply

Question 2

What is the standard unit of electrical resistance in the SI system?

Accepted Answer

Ohm

Answer

Farad

Answer

Henry

Answer

Siemens

Question 3

When calibrating an AC voltmeter, which parameter is most important to verify in addition to amplitude accuracy?

Accepted Answer

Frequency response across the instrument's rated bandwidth

Answer

DC offset

Answer

Battery voltage

Answer

Display brightness

Question 4

What is 'burden voltage' in the context of current calibration?

Accepted Answer

The voltage drop across a current-measuring instrument due to its internal resistance

Answer

The maximum voltage a power supply can deliver

Answer

The voltage required to start an electric motor

Answer

The output voltage of a current calibrator

Question 5

Which four-wire (Kelvin) measurement technique is used in precision resistance calibration to eliminate the effect of lead resistance?

Accepted Answer

Four-wire (Kelvin) connection

Answer

Two-terminal measurement

Answer

Bridge measurement

Answer

Single-ended measurement

Question 6

What does 'loading effect' mean when calibrating voltage-measuring instruments?

Accepted Answer

The change in the measured voltage caused by the instrument drawing current from the source

Answer

Physical weight of the instrument on the bench

Answer

Overloading the instrument with too high a voltage

Answer

The effect of ambient temperature on readings