Exam 11: Ac Instruments and Meters

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

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

____________________ are instruments that measure both ac and dc quantities.

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

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

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

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

Describe dynamometer movement.

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

Discuss the measurement of voltage and current.

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

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

Describe the Thompson inclined coil movement.

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

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