NCCER Electrical Level 3 Module 11 'Motor Controls'

If the heater in a fixed IEC bimetallic overload relay fails,

the entire overload relay must be replaced

The nameplate of a motor indicates that the motor has an FLC of 15A and a service factor of 1.15, how much additional current can this motor safely handle for intermittent power demands?

15A(1.15)= 17.25; 17.25A - 15A= 2.25A

The minimum allowable coil control voltage needed to keep an electromechanical device energized is called the ___.

seal-in-voltage

A general purpose NEMA enclosure is ___.

type 1

NEC Article 430, Part VII covers ___.

motor controllers

What describes a retro-reflective scan?

The scanning method in which a target is detected as it passes between a photo electric sensor and a reflector

If a duty cycle includes significant plugging or jogging, select an ___.

AC-4 rated motor control device

Jogging is also referred to as ___.

inching

Most transient suppression modules consist of an RC circuit that is designed to suppress coil voltage transients to approximately. what percentage of the peak coil supply voltage?

200%

Pilot devices are used in motor control circuits to provide ___.

sequencing and automatic operation within certain parameters

Which of The following are primarily designed for use with induction motor loads and to withstand the interrupt current of a locked rotor?

NEMA-rated contactors and /motor starters

All of the Start buttons must be connected in parallel with the auxiliary contactor and all of the Stop buttons must be connected in series when installing ___.

two or more pushbutton stations

In the figure above, the purpose of the MI normally closed contacts shown in the control circuit is to ___.

prevent the drain pump from operating when the fill pump is operating

A relay designated as a 3PDT-SB relay ______.

has three NO (normally open) and three NC (normally closed) contacts

IEC categories for Lightning and Motor control AC-1 is for ___.

noninductive or slightly inductive loads

In the figure above, the belt runoff switch ZS108A is connected to junction box JB108 by cable?

C108J

In the figure above, which of the following terminals of junction box JB108 connect to the local control station HS108?

1A , 2 , 3 , 10

The relay logic and truth table shown in the figure above, represents a ___.

NAND function

Review Figure 21 from page 18

Typical melting-alloy overload relay

The figure above represents an ___. (1)

Float Switch

The figure above represents an ___. (2)

Pressure Switch

The figure above represents an ___. (3)

Temperature Switch

The figure above represents an ___. (4)

Flow Switch