Deck 14: Multiple Push Button Stations and Hand-Off-Automatic Controls

Question 1

After wire numbers are placed on the schematic, corresponding numbers are placed on the control components.

Answer 1

True

Question 2

When a component is used to perform the function of stop in a control circuit, it will generally be a normally ____ component and be connected in ____ with the motor starter coil.

A) open; series
B) open; parallel
C) closed; series
D) closed; parallel

Answer 2

closed; series

Question 3

When M coil energizes, all M contacts ____.

A) de-energize
B) change position
C) stay where they are
D) connect in parallel

Answer 3

change position

Question 4

When the M coil energizes, what happens to the load contacts?

Question 5

When the M coil energizes, what happens to the normally open auxiliary contact?

Question 6

Hand-off-automatic controls are used to prevent an operator from selecting between automatic or manual operation of a motor.

Question 7

A flow switch can be used to detect the flow of water to ensure that a fan motor cannot run if there is no flow of cooling water.

Question 8

When the HOA switch is placed in the Auto position, a(n) ____ controls the action of the fan.

A) push-button
B) thermostat
C) operator
D) flow switch

Question 9

One terminal of both a normally open switch and normally closed switch are connected together. This forms a common point for both switches and could be used as the common terminal for a flow switch that contains a ____ switch.

A) single-pole double-throw
B) single-pole single-throw
C) double-pole single-throw
D) double-pole double-throw

Question 10

A(n) ____________________ line indicates that two switches are mechanically connected.

Question 11

A(n) ____________________ lamp indicates that there is no flow of water when the circuit is energized.

Question 12

What happens when the hand-off-automatic switch is set in the Hand position?

Question 13

Consider a circuit needing a flow switch with two separate contacts, one normally open and the other normally closed. When one switch changes position, the other switch changes position. What happens if a flow switch with two separate switches cannot be obtained?