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Position Indicators

Total questions: 130

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

Devices that provides an indication whether an object is at a certain position or not

a)

Switch Position Indicators

b)

Variable Position Indicators

c)

Instrumentation Position Indicators

d)

Module Position Indicators

2.

Devices that provide an accurate throttled position indication

a)

Switch Position Indicators

b)

Variable Position Indicators

c)

Instrumentation Position Indicators

d)

Module Position Indicators

3.

A limit switch detects a moving object when the object reaches a particular location

a)

True

b)

False

4.

Determine the presence or absence, passing, positioning, and end of travel of an object.

a)

Ultrasonic Sensor

b)

Reed Switches

c)

Capacitive Sensor

d)

Limit Switches

5.

Used to define the limit of travel of an object

a)

Photoelectric Sensor

b)

Reed Switches

c)

Capacitive Sensor

d)

Limit Switches

6.

Used to detect the presence of an object when physical contact is made between the object and the switch

a)

Inductive Sensor

b)

Reed Switches

c)

Capacitive Sensor

d)

Limit Switches

7.

In a limit switch, Normally Closed held closed in operated condition

a)

True

b)

False

8.

In a limit switch, Normally Open held closed in operated condition

a)

True

b)

False

9.

Limit switches may extend to be connected to a control circuit for -

a)

Indication

b)

Control

c)

Both Indication and Control

d)

Neither Indication and Control

10.

Two limit switches can be mechanically coupled to one another -

a)

True

b)

False

11.

Is the portion of the switch that comes in contact with the object being sensed

a)

Actuator

b)

Head

c)

Contact Block

d)

Terminal Block

12.

Houses the mechanism that translates actuator movement into contact movement

a)

Switch Body

b)

Head

c)

Contact Block

d)

Terminal Block

13.

Houses the electrical contact elements of the switch

a)

Switch Body

b)

Base

c)

Contact Block

d)

Terminal Block

14.

Contains the screw terminations. This is where the electrical connections between the switch and the rest of the control circuit is made

a)

Switch Body

b)

Base

c)

Contact Block

d)

Terminal Block

15.

Houses the contact block in a plug-in switch. It houses a combination contact block and terminal block in the non plug-in switch

a)

Switch Body

b)

Base

c)

Head

d)

Terminal Block

16.

Houses the terminal block in a plug-in switch

a)

Switch Body

b)

Base

c)

Head

d)

Contact Block

17.

Limit switch as a valve position indication, what indicates the valve in the fully closed position

a)

Upper Limit Switch

b)

Lower Limit Switch

c)

Throttle/Travel Switch

18.

Limit switch as a valve position indication, what indicates the valve in the fully open position

a)

Upper Limit Switch

b)

Lower Limit Switch

c)

Throttle/Travel Switch

19.

ADVANTAGES: Limit Switch

a)

Easily available

b)

Low cost

c)

Immunity to electrical noise and radio frequency interference

d)

Moving mechanical parts wear out eventually

e)

Not all applications can use contact sensing

20.

DISADVANTAGES: Limit Switch

a)

Suitable for switching high power loads

b)

Simple visible operation

c)

Immunity to electrical noise and radio frequency interference

d)

Moving mechanical parts wear out eventually

e)

Not all applications can use contact sensing

21.

Is an electrical switch operated by an applied magnetic field

a)

Inductive Sensor

b)

Reed Switches

c)

Capacitive Sensor

d)

Limit Switches

22.

A pair of overlapping electrical contacts of ferrous metal

a)

Reed Blades

b)

Reed Arms

c)

Reed Flaps

d)

Reed Rods

23.

A hermetically sealed capsule houses the pair of reed blades.

a)

True

b)

False

24.

The reed glass can be filled with a inert gas only

a)

True

b)

False

25.

In a reed switch, when the contacts close in the presence of magnetic field, it is -

a)

Normally Open

b)

Normally Closed

26.

In a reed switch, when the contacts open in the presence of magnetic field, it is -

a)

Normally Open

b)

Normally Closed

27.

Once the magnet is pulled away from the switch, the reed switch will go back to its original position

a)

True

b)

False

28.

Reed switches may be actuated by:

a)

An electromagnetic coil

b)

A permanent magnet

c)

Both choices

d)

Neither of the choices

29.

Reed switches are applied as cylinder piston position indication devices

a)

True

b)

False

30.

Reed switches can be used as a point indication device or a continuous indication device for valve position indication

a)

True

b)

False

31.

ADVANTAGE: Reed Switch

a)

Easily available

b)

Senses magnetic targets

c)

Low cost

d)

Vulnerable to vibration

32.

DISADVANTAGE: Reed Switch

a)

Easily available

b)

Senses magnetic targets

c)

Low cost

d)

Vulnerable to vibration

33.

Is a device that uses the principle of electromagnetic induction to detect or measure objects

a)

Inductive Sensor

b)

Capacitive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

34.

Types of mechanical output switch position indicators

a)

Limit Switch

b)

Reed Switch

c)

Inductive Sensor

d)

Ultrasonic Sensor

e)

Photoelectric Sensor

35.

Types of solid-state output switch position indicators

a)

Capacitive Sensor

b)

Reed Switch

c)

Inductive Sensor

d)

Ultrasonic Sensor

e)

Photoelectric Sensor

36.

Inductive sensors are used to detect metallic objects only

a)

True

b)

False

37.

A part of an inductive sensor that supplies electrical energy to the coil and ferrite core assembly

a)

Oscillator

b)

Trigger circuit

c)

Coil and Ferrite core assembly

d)

Solid-state output

38.

A part of an inductive sensor that generates an electromagnetic field from the electrical energy that the oscillator supplies

a)

Oscillator

b)

Trigger circuit

c)

Coil and Ferrite core assembly

d)

Solid-state output

39.

A part of an inductive sensor that detects changes in the amplitude of oscillation

a)

Oscillator

b)

Trigger circuit

c)

Coil and Ferrite core assembly

d)

Solid-state output

40.

A part of an inductive sensor that provides an electrical signal for an interface to a PLC or machine logic

a)

Oscillator

b)

Trigger circuit

c)

Coil and Ferrite core assembly

d)

Solid-state output

41.

A part of an inductive sensor that provides electronic switching mechanism

a)

Oscillator

b)

Trigger circuit

c)

Coil and Ferrite core assembly

d)

Solid-state output

42.

Inductive sensors are not used as valve position indicators

a)

True

b)

False

43.

ADVANTAGES: Inductive Sensors

a)

Not affected by moisture

b)

Not affected by dusty/dirty environments

c)

No moving parts/no mechanical wear

d)

Only senses the presence of metal targets

e)

Operating range is shorter than other available sensing technologies

44.

ADVANTAGES: Inductive Sensors

a)

No blind zone

b)

Not color dependent

c)

May be affected by strong electromagnetic fields

d)

Only senses the presence of metal targets

e)

Operating range is shorter than other available sensing technologies

45.

DISADVANTAGES: Inductive Sensors

a)

No blind zone

b)

Not color dependent

c)

May be affected by strong electromagnetic fields

d)

Only senses the presence of metal targets

e)

Operating range is shorter than other available sensing technologies

46.

Operates by reacting to alterations in an electrostatic field

a)

Capacitive Sensor

b)

Inductive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

47.

Capacitive sensing is a non-contact technology suitable for detecting materials having _____ dielectric constants than that of _____

a)

Greater, air

b)

Lesser, air

c)

Greater, water

d)

Lesser, water

48.

Capacitive sensors can sense metals, nonmetals, solids, and liquids

a)

True

b)

False

49.

Dielectric constant of air

a)

1

b)

0.5

c)

3

d)

7

50.

Materials with lower dielectric constant are easier to sense than those with higher values

a)

True

b)

False

51.

Part of capacitive sensors that supplies electrical energy to the capacitive probe/plate

a)

Oscillator

b)

Capacitive probe/plate

c)

Trigger circuit

d)

Solid-state output

e)

Potentiometer

52.

Part of capacitive sensors that radiates an electrostatic field which generates capacitive coupling between the probe and a target material entering the field

a)

Oscillator

b)

Capacitive probe/plate

c)

Trigger circuit

d)

Solid-state output

e)

Potentiometer

53.

Part of capacitive sensors that detect changes in the amplitude of oscillation

a)

Oscillator

b)

Capacitive probe/plate

c)

Trigger circuit

d)

Solid-state output

e)

Potentiometer

54.

Part of capacitive sensors that generates an electrical signal to be interpreted by an interface device such as a PLC

a)

Oscillator

b)

Capacitive probe/plate

c)

Trigger circuit

d)

Solid-state output

e)

Potentiometer

55.

Part of capacitive sensors that increases or decreases the sensors sensitivity

a)

Oscillator

b)

Capacitive probe/plate

c)

Trigger circuit

d)

Solid-state output

e)

Potentiometer

56.

In a capacitive sensor, the sensor electrode produces -

a)

Main field

b)

Compensation field

57.

In a capacitive sensor, this stabilizes an unshielded sensor

a)

Main field

b)

Compensation field

58.

Contaminants in the capacitive sensor will not change the compensation field therefor the capacitive sensor output will change

a)

True

b)

False

59.

Using a capacity sensing, liquid sensing in a hopper can be either through a window or embedded in material

a)

True

b)

False

60.

Sensing through sight glass to watch liquid level and insertion through sealed tubes into drums or holding tanks for chemical and aqueous solutions

a)

Liquid level sensing

b)

Product filling lines

c)

Plastic parts detection

d)

Pallet detection for materials handling

e)

Irregularly shaped products

61.

Bottling applications, Full-case detection, and checking material levels such as cereal boxes.

a)

Liquid level sensing

b)

Product filling lines

c)

Plastic parts detection

d)

Pallet detection for materials handling

e)

Irregularly shaped products

62.

Plastics on product packages, and plastic materials within a hopper

a)

Liquid level sensing

b)

Product filling lines

c)

Plastic parts detection

d)

Pallet detection for materials handling

e)

Irregularly shaped products

63.

Objects randomly oriented on conveyor belt, and highly textured objects

a)

Liquid level sensing

b)

Product filling lines

c)

Plastic parts detection

d)

Pallet detection for materials handling

e)

Irregularly shaped products

64.

Capacitive Sensors can be used in valve indication indication

a)

True

b)

False

65.

ADVANTAGES: Capacitive Sensors

a)

Detects metal and non metal, liquids and solids

b)

Can "see through" certain materials

c)

Solid-state, long life

d)

Short sensing distance varies widely acdg. to material

e)

Very sensitive to environmental factors

66.

ADVANTAGES: Capacitive Sensors

a)

Many mounting configuration

b)

Can "see through" certain materials

c)

Not at all selective for its target

d)

Short sensing distance varies widely acdg. to material

e)

Very sensitive to environmental factors

67.

DISADVANTAGES: Capacitive Sensors

a)

Not as accurate compare to inductive sensors

b)

Can "see through" certain materials

c)

Not at all selective for its target

d)

Short sensing distance varies widely acdg. to material

e)

Very sensitive to environmental factors

68.

Use a transducer to send and receive high frequency sound signals.

a)

Capacitive Sensor

b)

Inductive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

69.

Capable of detecting most objects - metal or nonmetal, clear or opaque, liquid, solid, or granular - that have sufficient acoustic reflectivity.

a)

Capacitive Sensor

b)

Inductive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

70.

Ultrasonic sensors are more affected by condensing moisture than photoelectric sensors.

a)

True

b)

False

71.

Ultrasonic sensors makes clothes, soft rubber, flour and foam poor target objects

a)

True

b)

False

72.

Ultrasonic Sensor calculates proximity using what formula

a)

d = csound(t1−t2)2d\ =\ \frac{c_{sound}\left(t_1-t_2\right)}{2}

b)

d = csound(t1+t2)2 d\ =\ \frac{c_{sound}\left(t_1+t_2\right)}{2}\

c)

d = csound(t2−t1)2d\ =\ \frac{c_{sound}\left(t_2-t_1\right)}{2}

d)

d = 2csound(t1+t2)d\ =\ 2c_{sound}\left(t_1+t_2\right)

e)

d = 2csound(t1−t2)d\ =\ 2c_{sound}\left(t_1-t_2\right)

73.

Speed of sound @20 C

a)

343 ms343\ \frac{m}{s}

b)

344 ms344\ \frac{m}{s}

c)

434 ms434\ \frac{m}{s}

d)

334 ms334\ \frac{m}{s}

74.

Ultrasonic Sensors can be used for -

a)

Distance measuring

b)

Object measuring

c)

Distance and Object measuring

d)

Neither Distance and Object measuring

75.

A part of an ultrasonic sensor that pulses, sending soundwaves outward from the face of the sensor, and receives echoes of those waves as reflected off an object.

a)

Ultrasonic Transducer

b)

Comparator and Detector circuit

c)

Solid-state output

76.

A part of an ultrasonic sensor that calculates the distance by comparing the emit-to-receive timeframes to the speed of sound

a)

Ultrasonic Transducer

b)

Comparator and Detector circuit

c)

Solid-state output

77.

A part of an ultrasonic sensor that generates electrical signal to be interpreted by an interface device like a PLC

a)

Ultrasonic Transducer

b)

Comparator and Detector circuit

c)

Solid-state output

78.

Industrial sensing frequency operates between -

a)

25kHz and 500kHz

b)

25Hz and 500Hz

c)

50kHz and 250kHz

d)

50Hz and 250Hz

79.

Sensing frequency is ________ to sensing distance

a)

Directly proportional

b)

Inversely proportional

80.

ADVANTAGES: Ultrasonic Sensor

a)

Able to sense large targets up to 15m away

b)

Response is not dependent upon the surface color or optical reflectivity of the object

c)

Very accurate response

d)

Must view a surface squarely to receive ample sound echo

e)

respond to some loud noises produced by air hoses and relief valve

81.

ADVANTAGES: Ultrasonic Sensor

a)

Ideal for level monitoring or linear motion monitoring applications

b)

Response is not dependent upon the surface color or optical reflectivity of the object

c)

Have a minimum sensing distance

d)

Must view a surface squarely to receive ample sound echo

e)

respond to some loud noises produced by air hoses and relief valve

82.

DISADVANTAGE: Ultrasonic Sensor

a)

Changes in the environment affect ultrasonic response

b)

Targets of low density may be difficult to sense at a long range

c)

Have a minimum sensing distance

d)

Must view a surface squarely to receive ample sound echo

e)

respond to some loud noises produced by air hoses and relief valve

83.

A switch where the mechanical actuator or lever arm function is replaced by a beam of light

a)

Capacitive Sensor

b)

Inductive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

84.

Operate by sensing a change in the amount of light received by a photodetector

a)

Capacitive Sensor

b)

Inductive Sensor

c)

Ultrasonic Sensor

d)

Photoelectric Sensor

85.

Part of a photoelectric sensor that uses a Light Emitting Diode (LED)

a)

Light source

b)

Light detector

c)

Lenses

d)

Logic circuit

e)

Output device

86.

The light source of a photoelectric sensor is also called

a)

Emitter

b)

Lighter

c)

Receiver

d)

Phillips

87.

Part of a photoelectric sensor that used to detect the light from the light source.

a)

Light source

b)

Light detector

c)

Lenses

d)

Logic circuit

e)

Output device

88.

The light detector can be a photodiode or a phototransistor, these are called

a)

Emitter

b)

Lighter

c)

Receiver

d)

Phillips

89.

Part of a photoelectric sensor that is used to narrow or shape the light area of the LED or photodetectors increasing their ranges

a)

Light source

b)

Light detector

c)

Lenses

d)

Logic circuit

e)

Output device

90.

Part of a photoelectric sensor that provides necessary electronics to modulate the LED, amplifies the signal from the detector, and determines whether the output should be activated

a)

Light source

b)

Light detector

c)

Lenses

d)

Logic circuit

e)

Output device

91.

Part of a photoelectric sensor that acts as the sensor switch

a)

Light source

b)

Light detector

c)

Lenses

d)

Logic circuit

e)

Output device

92.

In a photoelectric sensor, the photodetector can receive light directly from the source only

a)

True

b)

False

93.

Photoelectric sensors can be housed in separate source receiver packages or as a single unit (BASIC CIRCUIT)

a)

True

b)

False

94.

The photodiode activates the output when light is detected. When an object breaks the beam of light between the source and the receiver, the output turns off

a)

Source-Receiver Basic Circuit

b)

Self Contained Basic Circuit

95.

The output is activated when the light is reflected off an object back to the receiver

a)

Source-Receiver Basic Circuit

b)

Self Contained Basic Circuit

96.

Also called Separate-type Sensing/ Opposed Arrangement/ Transmitted Beam Arrangement

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

97.

The light source and receiver are contained in separate housings

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

98.

The light from the source shines directly on the receiver

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

99.

Has the highest maximum sensing range

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

100.

Suitable choice of target detection type in dusty or dirty environment

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

101.

Thru-Beam Arrangement can sense what type/s of objects

a)

Opaque

b)

Reflective

c)

Transparent

102.

The light beam from the emitter is bounced off a reflector and detected by the receiver

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

103.

May not be able to detect shiny objects because it is unable to differentiate between light from a shiny object and light reflected from reflector

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

104.

Thru-beam sensors are less desirable than retro-reflective sensors in highly contaminated environments

a)

True

b)

False

105.

Polarized Reflectors reflects back light waves 90 degrees shifted back to the receiver

a)

True

b)

False

106.

Possible workarounds on retro-reflective arrangement with reflective targets

a)

Change the orientation of object/sensor

b)

Polarized Reflector

c)

Reduce the amount of target object passing

d)

Use reflective surfaces to reflect light waves back to receiver

107.

The transmitted radiation must reflect off the object in order to reach the receiver.

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

108.

Reflection signal will depend on the reflective index of the target material

a)

Thru-Beam Arrangement

b)

Retro-Reflective Arrangement

c)

Diffuse-Type Sensing Arrangement

109.

Many manufacturers use Matte White paper specially formulated to be _____ reflective

a)

100%

b)

95%

c)

90%

d)

85%

110.

Reflective correction values less than 100% are_____than Matte White paper

a)

Less reflective

b)

More reflective

111.

Reflective correction values more than 100% are_____than Matte White Paper

a)

Less reflective

b)

More reflective

112.

The output is ON when the receiver can "see" sufficient light from the light source

a)

Light Operate Outputs

b)

Dark Operate Outputs

113.

The output is OFF when the receiver can "see" sufficient light from the light source

a)

Light Operate Outputs

b)

Dark Operate Outputs

114.

ADVANTAGES: Photoelectric Sensor

a)

Long life

b)

Longest sensing range

c)

Very fast response time

d)

Lens subject to contamination

e)

Sensing range affected by color and reflectivity of target

115.

DISADVANTAGES: Photoelectric Sensors

a)

Long life

b)

Longest sensing range

c)

Very fast response time

d)

Lens subject to contamination

e)

Sensing range affected by color and reflectivity of target

116.

Provides an accurate indication of position throughout the travel of a valve

a)

Potentiometer

b)

Linear Variable Differential Transformer

c)

Limit Switch

d)

Reed Switch

117.

The amount of current is ________ to the valve position in a potentiometer

a)

Inversely proportional

b)

Directly proportional

118.

The amount of resistance is _____ to the valve position in a potentiometer

a)

Inversely proportional

b)

Directly proportional

119.

LVDT stands for

a)

Linear Variable Differential Transformer

b)

Linear Variable Differential Transmitter

c)

Linear Varying Difference Transformer

d)

Linear Varying Differential Transducer

120.

An LVDT operates in a -

a)

Series aiding configuration

b)

Series opposing configuration

c)

Parallel aiding configuration

d)

Parallel opposing configuration

121.

In an LVDT, when the core is above the center Vout is equal to -

a)

VS1V_{S1}

b)

VS2V_{S2}

c)

−VS2-V_{S2}

d)

0

122.

In an LVDT, when the core is at the center Vout is equal to -

a)

VS1V_{S1}

b)

VS2V_{S2}

c)

−VS2-V_{S2}

d)

0

123.

In an LVDT, when the core is below the center Vout is equal to -

a)

VS1V_{S1}

b)

VS2V_{S2}

c)

−VS2-V_{S2}

d)

0

124.

An LVDT can be used as a variable position indicator

a)

True

b)

False

125.

An LVDT can be used in Indication and Control Circuits

a)

True

b)

False

126.

When the output of the LVDT Vout = Vs1

a)

Valve fully closed

b)

Valve fully open

c)

Valve throttled open

127.

When the output of the LVDT Vout = -Vs2

a)

Valve fully closed

b)

Valve fully open

c)

Valve throttled open

128.

When the output of the LVDT Vout = (-)

a)

Valve fully closed

b)

Valve fully open

c)

Valve throttled open

129.

When the output of the LVDT Vout = 0

a)

Valve fully closed

b)

Valve fully open

c)

Valve throttled open

130.

When the output of the LVDT Vout = (+)

a)

Valve fully closed

b)

Valve fully open

c)

Valve throttled open

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