Deck 11: Ac Instruments and Meters

Question 1

The repulsion-attraction movement is used for ammeters but not for voltmeters.

Answer 1

False

Question 2

A(n) ____________________ force is developed between two soft iron vanes that are affected by the same magnetic field.

Answer 2

repulsion

Question 3

In the ____________________ method of controlling the motion of the pointer in damping system, a vane retards the movement of the pointer.

Answer 3

air damping

Question 4

The ____________________ is the only means by which many of the waveforms and voltages found in electronic circuits can be understood.

Question 5

The d'Arsonval dc instrument movement can be used for ac measurement if a rectifier is also used.

Question 6

Describe dynamometer movement.

Question 7

Discuss the measurement of voltage and current.

Question 8

What are the three basic components that instruments used to measure ac voltage, current, watts, and VARs must have?

Question 9

The ____________________ movement has a soft iron plunger that projects into a stationary field coil.

Question 10

____________________ are instruments that measure both ac and dc quantities.

Question 11

The repulsion-type movement can be used for both current and voltage measurements.

Question 12

When using an oscilloscope, it must be kept in mind that the display shows the voltage with respect to time.

Question 13

Name three types of ac movements that can be used in measuring instruments.

Question 14

Describe the Thompson inclined coil movement.

Question 15

The equipment used to measure ac quantities is the same as the equipment used in dc measurements.