625

Which of the following statements describes how an air coll is magnetized?

As current is increased it reaches saturation

What is the unit of inductance?

Henry

Which of the following wit increase the inductance of a coil?

Decrease the spacing of the windings

What is the name given to the distortion caused on the AC feeders to elevator equipment, due to static drive controllers?

Notch etfect

Which of the following core materials would be able to create the strongest magnetic field for a given applied voltage?

Permalloy

Which term describes a materials ability to pass magnetic lines of force?

Permiablility

Refer to Figure 2 What is the function of resistor R1?

Prevents arcing across contact of BR

What effect does counter electromotive force (CEMF) have in an inductive circuit?

It is an opposing force applied voltage which resist changes in curcute current

At what point is counter electromotive force (CEMF) greatest in an inductive circuit?

When current reaches maximum

Of the items listed below, which affects the induuctance of a coll?

Spacing of the windings

When using a megger to check insulation resistance to ground which of the following would be an acceptable minimum resistance?

a.1 Meg ohms

Which term describes the opposition to current flow in AC inductor circuits?

Capacitive reactance

in a 100 volt 60 Hz circuit, what is the total reactance with a 4 Henry inductor in the circuit?

1507 ohms

Which of the following statements is true regarding AC in a purely inductive circuit

Current lags voltage by 90 degress

If a fixed is fiowing in the direction correct shown in when Figure amount of current 1. which of the following statements is viewed from the end of the wire marked X?

There will be no magnetic Field formed Until wire is wound into a coil