Free Printable BE 3rd trimester day 6 test

1.

Actuator position feedback is:

a)

Used in floating controls

b)

Used in proportional control

c)

A stray voltage or current in a control circuit

2.

As compared to across the line starters, reduced voltage starters:

a)

Reduce starting torque required

b)

Reduce inertia loads

c)

Reduce starting current inrush

3.

A dual element fuse has:

a)

Two normal one-time fuse links

b)

A thermal cut out only

c)

A thermal cut out in a normal fuse link

4.

An expected advantage of an electronic control system as compared to any other type of system would be:

a)

Is less expensive

b)

Has greater sensitivity

c)

No need for an external power source

5.

For ease of starting, a centrifugal refrigeration machine should be started with:

a)

Cylinders unloaded

b)

Inlet vanes closed

c)

Inlet vanes open

6.

The purpose of a dual input motor field coil in a two-wire spring return actuator is to:

a)

Reverse the actuator movement when the thermostat call for heat

b)

Eliminate the need for actuator limit switches

c)

Reduce power input at the end of the power stroke

7.

For successful application of floating controls , there must be:

a)

Very little time lag

b)

Considerable time lag

c)

An anticipator in the thermostat

8.

The control point of a thermostat is:

a)

The same as the set point

b)

1/2 the differential

c)

The temperature that the thermostat operates to maintain

9.

Line or ladder type electrical diagrams are most useful for:

a)

Doing the actual wiring

b)

Showing the color coding of the wiring

c)

Understanding circuit operation

10.

A self-contained automatic control system requires:

a)

Compressed air

b)

Electric power

c)

No external power

11.

The Star Delta starter operates by:

a)

Adding resistance to the motor

b)

Energizing the motor windings in increments

c)

Switches the motor windings from one arrangement to the other

12.

In a timed two position control heating and cooling thermostat, the heat anticipator:

a)

Warms the thermostat sensing element during the cooling cycle

b)

Turns off the compressor sooner by heating the sensing element

c)

Is wired in series with the sensing element

13.

Installation or connection diagrams most closely resemble:

a)

Schematic diagrams

b)

Wiring diagrams

c)

Line diagrams

14.

A three-wire two-position control system uses:

a)

A solenoid type actuator

b)

A reversable motor with limit switches

c)

An unidirectional motor with cam-operated switches

15.

An example of a controlled variable is:

a)

Temperature

b)

A Valve

c)

Steam

16.

The autotransformer starter is so named because it:

a)

Automatically increases motor voltage according to the inertial load

b)

Uses 2 or 3 Transformers

c)

Operates automatically

17.

Controls referred to as all on or all off are:

a)

Floating

b)

Proportional

c)

Two position

18.

Electric control systems:

a)

None of the listed answers

b)

Always use bi-metal sensing element

c)

Can only make or break an electrical circuit

19.

A single phase motor in which the starting capacitor remains connected when the motor runs is called a:

a)

Split phase motor

b)

Permanent split capacitor

c)

Capacitor start induction run

20.

A Bourdon tube is used to measure:

a)

Electrical resistance

b)

Temperature

c)

Pressure

d)

Community

21.

Control circuits should be independently fused to:

a)

Avoid the use of small wire

b)

Avoid causing a fire

c)

Reduce the control voltage

22.

The primary power source in all control systems:

a)

Classifies the type of system

b)

Is electricity

c)

Is compressed air

23.

In single phase Motors, the resistance of the start winding is usually:

a)

Equal to the run winding

b)

Less than the resistance of the run winding

c)

Greater than the resistance of the run winding

24.

A thermostat embedded in the windings of a motor provides:

a)

Inherent protection

b)

High inductance

c)

Low starting inrush current

25.

A safety rule that should never be violated is “Lockout - Tagout” procedures.

a)

True

b)

False

26.

An Insulator will produce what reading?

a)

O.O

b)

O.L

27.

A motor starter is a:

a)

Sensing element

b)

Control medium

c)

Controlled device

d)

Part of a process

28.

Fuses in motor branch circuits primarily provide:

a)

Single phasing

b)

Motor running overcurrent protection

c)

Motor short circuit protection

29.

Operation of the potential relay is based on the principle that:

a)

Capacitors store electrical energy

b)

Locked rotor current results in voltage drop

c)

Motors develop counter EMF

30.

Contactors:

a)

Are similar to relays

b)

Provide motor overload protection

c)

Always have three poles

31.

A thermistor is a:

a)

Type of thermocouple

b)

Type of resistor

c)

Bimetal

d)

Pressure sensitive bobbin

32.

A controller:

a)

Transforms a signal into motion

b)

Receives a signal

c)

Senses in measures changes

d)

Does all the listed items

33.

An example of a control medium is:

a)

Thermostat

b)

Heat cooling coil

c)

A damper

d)

Water

34.

Hygroscopic materials are used to sense changes in:

a)

The pressure in a tank

b)

Relative humidity

c)

Dry bulb temperature

35.

For maximum safety of equipment, overload relays should be:

a)

Included in contactors

b)

Automatic reset type

c)

A manual reset type

36.

Which is faster and more reliable

a)

Fusible links

b)

Circuit breakers

c)

Fuses

37.

A bimetal element is:

a)

Used to sense electrical resistance

b)

Always made in a U shape

c)

Composed of two dissimilar metals

38.

A final control element could be used to:

a)

Since temperature changes

b)

Regulate water flow operate the control device

c)

Actuate a damper blade

39.

A bellows is used to:

a)

Only with remote bulb thermostats

b)

In both pressure and temperature controllers

c)

Only in temperature controllers

d)

Only in pressure controllers

40.

The main difference between a contactor and a motor starter is:

a)

Timing

b)

Overload protection

c)

Physical size

41.

Breakers can only trip so many times before they must be replaced:

a)

TRUE

b)

FALSE

42.

Controlled devices consist of two parts

a)

Actuator and final control element

b)

Controller and the controlled device

c)

Thermostat and valve

43.

The part of a controlled device that acts on the control medium is the:

a)

Actuator

b)

Final control element

c)

Shaft

44.

The useful lubricating oil pressure of a compressor depends on:

a)

both the oil pump discharge pressure and the compressor discharge pressure

b)

the oil pump discharge pressure alone

c)

both the oil pump discharge pressure and the compressor suction pressure

45.

Humidity controls for ordinary comfort air conditioning systems usually use controllers that sense:

a)

wet bulb

b)

relative humidity

c)

bsolute humidity

d)

dew point temperature

46.

t is necessary to use reversible actuators in floating control systems.

a)

TRUE

b)

FALSE

47.

One difference in the proportional control system compared to other types of controlsystems is the proportional control systems feedback feature.

a)

TRUE

b)

FALSE

48.

When a proportional control motor is running, it can be stopped:

a)

by either the controller or the limit switches

b)

only by the controller

c)

only by it s limit switches

49.

A Wheatstone bridge circuit contains:

a)

a potentiometer and wiper arm

b)

Four resistors

c)

Three resistors

d)

Two resistors

50.

The control point of a thermostat is:

a)

The setpoint

b)

Deadband

c)

Heat anticipator

d)

Offset

51.

A safety rule that should never be violated is “Lockout - Tagout” procedures.

a)

True

b)

False

52.

An Insulator will produce what reading?

a)

O.O

b)

O.L

53.

A motor starter is a:

a)

Sensing element

b)

Control medium

c)

Controlled device

d)

Part of a process

54.

Contactors:

a)

Are similar to relays

b)

Provide motor overload protection

c)

Always have three poles

55.

Breakers can only trip so many times before they must be replaced:

a)

TRUE

b)

FALSE

56.

Capacitors are rated in:

a)

Microfarads'

b)

Maxwells

c)

Henrys

57.

What is the best conductor of electricity?

a)

Gold

b)

Silver

c)

Copper

d)

Aluminum

58.

Most A/C Volt meters and Amp meters are calibrated in:

a)

RMS

b)

SAE

c)

NIST

59.

If a circuit is constructed so that electrons flow in one possible path, the circuit is called:

a)

Series

b)

Parallel

c)

Ladder

d)

Single line

60.

According to Kirkhoff's law, the voltage drop in a series circuit is:

a)

equal to the applied voltage

b)

can be 10% of the applied voltage

c)

is a derivative of Watts law

61.

In 3 phase A/C systems, the phases are out of phase by how many degrees?

a)

60

b)

120

c)

90

62.

Before you work on electrical equipment you should assume that it is:

a)

ON

b)

OFF

c)

Safe

63.

Who is responsible for safety?

a)

My self

b)

My customer

c)

My company

64.

Most permanent magnets and all electromagnets are

a)

Artificial

b)

Rare

c)

Temporary

65.

When measuring the resistance of any component, power should be?

a)

ON

b)

OFF

c)

Doesn't matter

66.

The most common type of voltage used in the US is?

a)

115V 1 Ph

b)

230v 1 Ph

c)

480V 1 Ph

67.

The control point of a thermostat is:

a)

Setpoint

b)

Deadband

c)

Offset

68.

For successful application of floating control, there must be:

a)

Very little time lag

b)

Deadband

c)

Low voltage

d)

Maximum voltage

69.

Actuator position feedback is:

a)

Used in floating control

b)

Used in proportional control

c)

A stray voltage or current

70.

An expected advantage of an electronic control system as compared to any other type of system would be:

a)

It is less expensive

b)

Has greater sensitivity

c)

No need for an external power source

d)

use of large electric currents

71.

A Bordon tube is used to measure:

a)

Temperature

b)

Pressure

c)

Humidity

d)

Flow

72.

Hz is the abbreviation for:

a)

Current

b)

Hertz

c)

Phase

73.

Controlled devices consist of two parts, the _____________ and the____________

a)

^{Final control element}

b)

Actuator

c)

Contacts

d)

Coil

74.

An example of a controlled variable is:

a)

steam

b)

a valve

c)

Temperature

d)

a sensing element

75.

A controller:

a)

senses and measures changes

b)

receives a signal

c)

transforms a signal to motion

d)

does all of the above

76.

An example of a control medium is:

a)

a thermostat

b)

a damper

c)

a cooling coil

d)

water

77.

A final control element could be used to:

a)

actuate a damper blade

b)

regulate water flow

c)

operate the controlled device

d)

operate the controlled device

78.

A thermistor is a:

a)

pressure-sensitive bobbin

b)

bimetal

c)

type of resistor

d)

type of thermocouple

79.

Hygroscopic materials are used to sense changes in:

a)

dry bulb temperature

b)

relative humidity

c)

the pressure in a tank

80.

A self contained automatic control system requires:

a)

compressed air

b)

electrical power

c)

no external power

81.

The primary power source in all control systems:

a)

is electricity

b)

is compressed air

c)

classifies the type of system is electricity

d)

is taken from amplifier output

82.

A common example of a self contained control is a thermostatic expansion valve

a)

True

b)

False

83.

For successful application of floating control, there must be:

a)

very little time lag

b)

considerable time lag

c)

no intermediate actuator positions

d)

an anticipator in the thermostat

84.

A potentiometer is:

a)

a variable resistor

b)

an electronic relay

c)

a multi-coil transformer

d)

a P-E switch

85.

Transformers can be used to:

a)

only reduce the voltage

b)

amplify direct-current

c)

provide several voltages

d)

provide a variable resistance

86.

In order to make a pneumatic thermostat turn on and off a motor on an air-conditioning system fan,

you would use:

a)

a DPDT switch

b)

a P-E switch

c)

an E-P switch

BE 3rd trimester day 6 test

Total questions: 86

Worksheet time: 5hrs 6mins

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