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Worksheets

ETC 605

Total questions: 40

Worksheet time: 7hrs 40mins

Name
Class
Date
1.

__________ is a device for making and breaking the connection in an electric circuit.

a)

switch

b)

wire

2.

Toggle are basically _________ in nature, that will change its contact when pressed and will NOT return back to its initial state upon release.

a)

momentary

b)

maintained

3.

The contact of this switch is NORMALLY ______.

a)

OPEN

b)

CLOSE

4.

The contact of this switch is NORMALLY ______.

a)

OPEN

b)

CLOSE

5.

Identify this type of switch.

a)

pushbutton

b)

toggle

c)

rocker

d)

selector

6.

Identify this type of switch.

a)

pushbutton

b)

toggle

c)

limit

d)

selector

7.

Identify this type of switch.

a)

float

b)

toggle

c)

limit

d)

selector

8.

Identify this type of switch.

a)

float

b)

pressure

c)

temperature

d)

selector

9.

Identify this type of switch.

a)

float

b)

pressure

c)

temperature

d)

flow

10.

Identify this type of switch.

a)

float

b)

pressure

c)

temperature

d)

flow

11.

In the limit switch shown in the picture, identify the name of the part labeled with number 1?

a)

operator

b)

cover

c)

switch case

d)

internal switch

12.

When the valve reaches the its desired position, what will be the position of the correctly set limit switch?

a)

open

b)

close

c)

half open

d)

half close

13.

In limit switches, it is the distance or angle that the actuator must go through to trip the contacts.

a)

pre travel

b)

post travel

c)

mid travel

d)

operating point

14.

A part of limit switch containing the electrical contact mechanism.

a)

switch body

b)

switch contact

c)

lever

15.

The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.

a)

switch body

b)

switch contact

c)

lever

d)

terminals

16.

_________ limit switches are often chosen for their precise operating abilities, small size and low cost.

a)

Precision

b)

Large

c)

Tiny

17.

This type of switch is _____ pole, _____ throw.

a)

double; double

b)

double; single

c)

single; double

d)

single; single

18.

Automatically operated switches can be operated by process variables such as flow, level, temperature and pressure.

a)

TRUE

b)

FALSE

19.

Mercury switches are replaced by REED switches due to __________ hazards.

a)

environmental

b)

physical

c)

ergonomics

20.

The ________ refers to the number of complete circuits that can pass thru the circuit at one time.

a)

pole

b)

throw

c)

terminals

21.

The OPENING of contact in a switch is called ________.

a)

break

b)

make

c)

half break

d)

half make

22.

The CLOSING of contact in a switch is called ________.

a)

break

b)

make

c)

half break

d)

half make

23.

REED relay contacts are activated by external __________.

a)

magnet

b)

battery

c)

chemicals

d)

pressure

24.

A _________ switch uses changes in level of a liquid to open and close the contact.

a)

float

b)

pressure

c)

temperature

25.

In a pressure switch, the ________ spring is used to set the differential values.

a)

compression

b)

tension

c)

contact

26.

Identify the following part of a pressure switch.

a)

compression spring

b)

tension spring

c)

contact

27.

_______ switch are used to convert mechanical motion into an electrical signal and limit the actions of the process.

a)

limit

b)

pressure

c)

temperature

28.

A rod level limit switch is also called ________.

a)

wobble stick

b)

joystick

c)

keyboard

29.

This type of switch is _____ pole, _____ throw.

a)

double; double

b)

double; single

c)

single; double

d)

single; single

30.

This type of switch is _____ pole, _____ throw.

a)

double; double

b)

double; single

c)

single; double

d)

single; single

31.

_________ switch is a manual switch that is used to reverse the rotation of motors.

a)

drum

b)

level

c)

limit

32.

Which of the following is NOT a type of interlocking.

a)

auxilliary

b)

mechanical

c)

pushbutton

d)

level

33.

A __________ is a bank of normally close and normally open switches that are controlled by a single lever or handle.

a)

joystick

b)

wobble stick

34.

What type of interlocking provides electrical isolation of the opposing energized coil?

a)

auxilliary

b)

mechanical

c)

pushbutton

35.

What type of limit switch actuator is used on limit switches with maintained contact switching?

a)

rod lever

b)

forked type

c)

adjustable roller

36.

Load that the switch can handle without making or breaking the load.

a)

Continuous rating

b)

Interrupting rating

c)

overload rating

37.

When a switch will make or break, an ________ will then occur across the contacts which will tend to heat and burn them.

a)

arc

b)

moisture

c)

dust

38.

________return limit switches have no spring return mechanism, it relies on its weight to return it to its free position

a)

Gravity

b)

REED

c)

Magnetic

39.

The position of the actuator at which the contacts return to their original state

a)

Release point

b)

Operating point

c)

Differential point

40.

Ability of a switch to repeat its characteristics precisely from one operation to the next operation

a)

Repeat accuracy

b)

travel return

c)

operating force