(1)A universal motor has very good speed regulation (2)A rectifier converts ac t

Question

(1)A universal motor has very good speed regulation (2)A rectifier converts ac to smooth dc (3)The range of an ammeter is decreased by increasing the resistance of the shunt (4)A clamp-on ammeter can measure ac current without interrupting the circuit (5)The internal resistance of a voltmeter should be as low as possible (6)Only one wattmeter is needed to measure the power used by a balanced three phrase load (7)Wattmeters measure apparent power rather than true power (8)The current-voltage method of measuring impedance is unsuitable for high frequency or very high impedance conditions

Explanation / Answer

1) TRUE

2)FALSE ( converts pulsating DC)

3)TRUE(as shunt resistance increases current through it decreases,)

4)TRUE(it is closed electro magnetic clamped on conductor)

5)FALSE (should very very high to allow low current through meter )

6)TRUE( since balanced. P=3times phase power)

7)FALSE (measures true power only)

8)TRUE( as Frequency changes change impedance value)

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