Motors Final Review pt 3/4

Question 1

NEMA AC motors are designed for ____ hertz power.

Answer 1

60

Question 2

Devices built according to the ____ standard have a smaller footprint.

Answer 2

IEC

Question 3

A typical Hand-Off-Auto (HOA) control operation typically requires a ____ position selector switch with _____ contacts.

Answer 3

Three/

Two

Question 4

In a ladder diagram the maximum number of output devices permitted in a single rung is ____.

Answer 4

one

Question 5

Double break contacts have ____ current rating than single break contacts of the same size.

Answer 5

higher

Question 6

A switch contact which changes state when actuated, but returns to its initial state when the actuation is removed, is called a(n) _____ operator.

Answer 6

momentary

Question 7

Motor control operations that require quick operator interaction utilize a(n) _____ type pushbutton switch.

Answer 7

mushroom

Question 8

The most common type of maintained contact selector switches has ____ positions.

Answer 8

two

Question 9

Two types of visual indicators normally associated with a hazard problem or a proceed with caution warning are ____ and ____.

Answer 9

rotating beacon/

flashing beacon

Question 10

A cluster pilot light allows up to ____ lamps in a single pilot light.

Answer 10

four

Question 11

Limit switches are ____ devices that are activated by ____ contact with a moving object.

Answer 11

mechanical/

physical

Question 12

Lever, Fork Lever, wobble stick, and ____ are all limit switch actuators.

Answer 12

push rod

Question 13

Liquid level, pressure, fluid flow, and material temperature are automatically operated input devices that are triggered by ____.

Answer 13

a change in temperature

Question 14

Positive pressure, ____, and differential pressure are the three categories of pressure devices.

Answer 14

vacuum

Question 15

____ are often used in equipment enclosures to detect open panel doors and missing equipment guards.

Answer 15

Miniature switches

Question 16

Bi-metallic strip, ____ , and direct immerse probe are three frequently used mechanical temperature sensing devices.

Answer 16

capillary tube

Question 17

To step down from 208V to 120 V the control transformer primary windings are connected in ____ w/a metal clip supplied by the manufacturer.

Answer 17

parallel

Question 18

Clock timers are best suited for ____.

Answer 18

production systems

Question 19

____ manage their timing function by controlling fluid flow or air flow through a small orifice.

Answer 19

Dashpot timers

Question 20

The most widely used type of drawing for a control circuit analysis is a(n) ____

Answer 20

ladder (schematic) diagram

Question 21

Pneumatic timers are most accurate near their ____ range.

Answer 21

median

Question 22

Motor control drawings show their components in the ____ state.

Answer 22

de-energized

Question 23

A ____ timer configured w/one contact w/a time delay of 15 seconds when power is removed from the timer the contact remains closed.

Answer 23

NODODE (normally open,delay on, de-energized)