Chapter 2 BEL1133

What happens if Ammeter is put in parallel to a circuit to be measured? Answer in ONE word.

Choose the CORRECT sentence.

• The larger the current, the more magnetic fields, the more needle moves

• Higher shunt resistor value is preferable in Ammeter

• The voltmeter and ammeter difference is due to the scale of meter

• Ohmmeter only have a single scale features

What are NOT the differences between Ohmmeter and voltmeter

• Both has shunt resistor places in the meter

• Both has source voltage to make it function

• Both has internal resistance in it

• Both are based on current measurements

Which part of the PMMC that will improve accuracy and efficiency? Select the part on the picture given.

Answer explanation

Its the iron core! it will concentrate the magnetic field inside the PMMC.

How to solve a problem in PMMC to ensure the coil going back to its original position?

Pick WRONG statement on sensitivity in a meter.

• The higher the sensitivity, the better the measurements

• The DC and AC sensitivity are different to each other in measurement.

• Sensitivity is applicable for all types of meter.

• The calculation of sensitivity involves internal resistance and shunt resistance.

Ohmeter, Voltmeter and Ammeter measurements in any circuit are based on what parameter?

Measurements of a meter requires understanding of theory of meter measurement and statistics. Limiting error is one of the statistical analysis needs to be aware when doing measurement. Choose the CORRECT answer.

• Limiting error increases in higher scale of a meter.

• Limiting error depends on meter sensitivity and iron core.

• Limiting error do not applicable for Ohmmeter.

• Limiting error does not change for any measurement.

On first half-wave cycle, current will passes through diodes _________ and _________

• D1 , D4

• D1 , D2

• D2, D4

• D2, D3

Find R value in the circuit.

• 1,5 ohm

• 2 ohm

• 2,5 ohm

• 3 ohm