Motors Final Review pt 3/4 Flashcards
NEMA AC motors are designed for ____ hertz power.
60
Devices built according to the ____ standard have a smaller footprint.
IEC
A typical Hand-Off-Auto (HOA) control operation typically requires a ____ position selector switch with _____ contacts.
Three/
Two
In a ladder diagram the maximum number of output devices permitted in a single rung is ____.
one
Double break contacts have ____ current rating than single break contacts of the same size.
higher
A switch contact which changes state when actuated, but returns to its initial state when the actuation is removed, is called a(n) _____ operator.
momentary
Motor control operations that require quick operator interaction utilize a(n) _____ type pushbutton switch.
mushroom
The most common type of maintained contact selector switches has ____ positions.
two
Two types of visual indicators normally associated with a hazard problem or a proceed with caution warning are ____ and ____.
rotating beacon/
flashing beacon
A cluster pilot light allows up to ____ lamps in a single pilot light.
four
Limit switches are ____ devices that are activated by ____ contact with a moving object.
mechanical/
physical
Lever, Fork Lever, wobble stick, and ____ are all limit switch actuators.
push rod
Liquid level, pressure, fluid flow, and material temperature are automatically operated input devices that are triggered by ____.
a change in temperature
Positive pressure, ____, and differential pressure are the three categories of pressure devices.
vacuum
____ are often used in equipment enclosures to detect open panel doors and missing equipment guards.
Miniature switches
Bi-metallic strip, ____ , and direct immerse probe are three frequently used mechanical temperature sensing devices.
capillary tube
To step down from 208V to 120 V the control transformer primary windings are connected in ____ w/a metal clip supplied by the manufacturer.
parallel
Clock timers are best suited for ____.
production systems
____ manage their timing function by controlling fluid flow or air flow through a small orifice.
Dashpot timers
The most widely used type of drawing for a control circuit analysis is a(n) ____
ladder (schematic) diagram
Pneumatic timers are most accurate near their ____ range.
median
Motor control drawings show their components in the ____ state.
de-energized
A ____ timer configured w/one contact w/a time delay of 15 seconds when power is removed from the timer the contact remains closed.
NODODE (normally open,delay on, de-energized)
