Electrical Principles for the Electrical Trades 7th Edition By Bob Harper – Test Bank

Description

Electrical Principles for the Electrical Trades 7th Edition By Bob Harper – Test Bank

 Sample Questions

Instant Download With Answers

UEENEEE141A

Testbank

 

Multiple Choice Questions

1.	The generation, supply and distribution subsector is responsible for electrical power generation, transmission and distribution from electrical power stations to: A. the first user   B. the second user   C. the end user   D. the middle user

 

2.

The generation, supply and distribution subsector employs a range of people, including: A. electrical engineers and operators, electrical lines workers and electricians   B. mechanical engineers and operators, electrical lines workers and electricians   C. civil engineers and operators, electrical lines workers and electricians   D. electronic engineers and operators, electrical lines workers and electricians

 

3.	Electrical professionals design, construct and maintain: A. the human network   B. the electronics work   C. the mobile network   D. the electrical network

 

4.

Who employs many electricians to install and maintain machinery and electrical wiring and equipment to industrial installations, factories and mining sites? A. The industrial and mining subsector   B. The government and mining subsector   C. The civil and mining subsector   D. The mechanical and mining subsector

 

5.

The industrial and mining subsector also includes instrumentation, which is the installation, maintenance and calibration of instruments used in processing and manufacturing to measure data such as: A. voltage, current, time rates, temperature and torque   B. power, current, flow rates, temperature and location   C. voltage, current, flow rates, temperature and location   D. voltage, current, flow rates, frequency and location

 

6.	Control wiring and equipment is used to regulate motors, valves and other devices used in electrical equipment such as: A. mixer grinders   B. conveyor belts, smelters, lifts and escalators   C. drillers   D. None of the given answers are correct

 

7.	The commercial and domestic construction and maintenance subsectors both employ licensed: A. electricians   B. mechanists   C. artists   D. civil people

 

8.	Offices, large retail outlets, shops, restaurants, hotels and like comprise: A. the domestic subsector   B. the electrical subsector   C. the commercial subsector   D. the common subsector

 

9.	Residential dwellings are categorised under: A. the electrical subsector   B. the commercial subsector   C. the common subsector   D. the domestic subsector

 

10.

The electronics industry is similar to the electrical industry in that both require people with a: A. high level of electronics-related knowledge and skills   B. high level of electricity-related knowledge and skills   C. high level of electromechanical-related knowledge and skills   D. high level of mechanical- and civil-related knowledge and skills

 

11.	Which field involves the installation of cable and optical fibre across the country? A. Data and telecommunications   B. Radio communications   C. Industrial electronics   D. Computer systems

 

12.	Which field involves the installation, servicing and maintenance of IT equipment? A. Data and telecommunications   B. Radio communications   C. Industrial electronics   D. Computer systems

 

13.	Which field involves servicing, maintenance and repair of photocopiers, cash registers and similar equipment used in offices and retail outlets? A. Commercial electronics   B. Consumer electronics   C. Industrial electronics   D. Computer systems

 

14.	Which field involves the servicing, maintenance and repair of electronic equipment such as televisions and microwaves? A. Commercial electronics   B. Consumer electronics   C. Industrial electronics   D. Computer systems

 

15.	Which field involves the installation, servicing and maintenance of commercial and domestic equipment such as CCTV, infrared and motion detectors and X-ray scanners? A. Industrial electronics   B. Computer systems   C. Security systems   D. Commercial electronics

 

16.	How many types of circuit can be categorised their complexity? A. One   B. Four   C. Three   D. Five

 

17.	The source is simply where: A. the current comes from   B. the energy comes from   C. the power comes from   D. the voltage comes from

 

18.	The load is which part of the circuit? A. The receiving part   B. The working part   C. The source part   D. The sending part

 

19.	When there is no voltage present, electrons wander around the metallic conductor: A. in a random manner, with no particular direction   B. in an even manner, with no particular direction   C. in a random manner, with particular direction   D. in a random manner, with opposite direction

 

20.

When a voltage is placed across two points of a solid conductor: A. the photons will migrate away from the positive of the supplied voltage and towards the negative of the supplied voltage   B. the electrons will migrate towards negative of the supplied voltage and away from the positive of the supplied voltage   C. the electrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage   D. the neutrons will migrate away from the negative of the supplied voltage and towards the positive of the supplied voltage

 

21.	Before electrons were known of, the (arbitrary) convention was that current flowed from: A. negative to negative   B. positive to positive   C. negative to positive   D. positive to negative

 

22.	Which is a pictorial method of recording the connections of a circuit quickly, simply and in a way that is easy to understand? A. Circle diagrams   B. Circuit diagrams   C. Flow diagrams   D. Gap diagrams

 

23.	A circuit drawn by one person must be able to be easily read by others who know the: A. standards   B. ideas   C. current   D. design

 

24.	The symbols generally represent: A. a picture   B. a picture rather than a concept   C. a concept rather than a picture   D. a concept and a picture

 

25.	Components are labelled: A. from right to left and top to bottom   B. from left to right and bottom to top   C. from right to left and bottom to top   D. from left to right and top to bottom

 

26.

The discrepancy in ammeter readings can be ignored: A. when the resistor has a comparatively high value of resistance when compared with the voltmeter resistance   B. when the resistor has a comparatively low value of resistance when compared with the voltmeter resistance   C. when the resistor has a comparatively high value of resistance when compared with the wattmeter resistance   D. when the inductor has a comparatively low value of inductance when compared with the voltmeter resistance

 

27.	The resistances on a bridge read R1 = 10 kΩ, R2 = 1 kΩ and R3 = 3.95 kΩ. Find the value of the resistance being measured. A. 38.20 kΩ   B. 36.20 kΩ   C. 39.50 kΩ   D. 37.45 kΩ

 

28.	In some cases or emergencies, even a flashing warning light might not draw enough attention, so: A. an alarm is sounded   B. a motor starts to run   C. a generator fails to run   D. None of the given answers are correct

 

29.	In a typical domestic home, the smaller wattage lamp always has the: A. lowest voltage across it   B. highest resistance   C. lowest resistance   D. highest voltage across it

 

30.	Which tester reads both a.c. and d.c. up to voltages of 500 V? A. An electronic-based voltage detector   B. A plug-style tester   C. A vibrating tester   D. An electrical-based voltage detector

 

31.	Many instruments used today incorporate a multitude of different test functions that include a(n): A. electronic-based voltage detector   B. plug-style tester   C. vibrating tester   D. electrical-based voltage detector

 

32.	The logic probe will operate satisfactorily at: A. 20 MHz   B. 20 Hz   C. 20 KHz   D. 40 MHz

 

33.	Either current or voltage ranges being exceeded is called: A. under load   B. full load   C. overload   D. no load

 

34.	an ammeter connected across a voltage source is an example of: A. a wrong connection   B. a tee connection   C. a ring connection   D. a right connection

 

35.	When checking an unknown voltage (or current), always start with: A. the approximate range   B. the medium range   C. the highest range   D. the lowest range

 

36.

Only commercially produced test lamps pass the safety conditions required by: A. AS/NZS 61010, IEC 6664 and various relevant state acts and regulations   B. AS/NZS 61010, IEC 61010and various relevant state acts and regulations   C. AS/NZS 6110, IEC 60664 and various relevant state acts and regulations   D. AS/NZS 6110, IEC 6066 and various relevant state acts and regulations

 

37.	Which is a registered trade name of an analogue multimeter? A. AOV   B. VOA   C. AVO   D. VAO

 

38.	Which type of meter is quite sensitive and often gives a full-scale deflection with a current of microamperes? A. Modern multimeters   B. Modern ammeters   C. Older ammeters   D. The first ammeter ever invented

 

39.	A digital multimeter is similar to an analogue multimeter, the only major difference being that the meter movement is replaced with a(n): A. analogue converter   B. dual converter   C. semi converter   D. digital converter

 

40.	The LCD display of a meter generally has: A. a front-lit function to allow it to be read in low light   B. a front-lit function to allow it to be read in high light   C. a back-lit function to allow it to be read in low light   D. a back-lit function to allow it to be read in high light

 

41.	A digital multimeter is subject to large errors in the presence of a: A. radio-frequency field   B. audio-frequency field   C. power-frequency field   D. high-frequency field

 

42.	A digital device takes: A. more days to respond to the new value and settle again   B. less time to respond to the new value and settle again   C. a longer time to respond to the new value and settle again   D. a longer time to respond to the old value

 

43.

Clamp action meters are generally used to measure: A. voltage without having to interrupt the circuit being tested   B. power without having to interrupt the circuit being tested   C. frequency without having to interrupt the circuit being tested   D. currents without having to interrupt the circuit being tested

 

44.	Which instrument has a moving needle and can measure continuously changing values quickly and easily? A. An analogue instrument   B. A digital instrument   C. A musical instrument   D. An optical instrument

 

45.

The face of the moving needle meter is calibrated to reflect: A. the power value caused by a certain voltage or current   B. the speed value caused by a certain voltage or current   C. the torque value caused by a certain voltage or current   D. the power-factor value caused by a certain voltage or current

 

46.	Which instruments have the ability to connect wirelessly via Bluetooth, Wi-Fi or mobile data? A. Modern microcontroller instruments   B. Modern microprocessor instruments   C. Analogue instruments   D. Digital instruments

 

47.	When used as an insulation tester, the bridge IR tester is a direct-reading series ohmmeter for: A. high-resistance values   B. low-resistance values   C. medium-resistance values   D. constant-resistance values

 

48.	The magnetic field tends to take the path of: A. highest magnetic resistance   B. variable magnetic resistance   C. least magnetic resistance   D. constant magnetic resistance

 

49.	Magnetic shields in sensitive instruments are often made of a material known as ‘Mu-metal’, which is a: A. nickel-chromium alloy   B. nickel-iron alloy   C. nickel-cobalt alloy   D. nickel-aluminium alloy

 

50.	Reed switches consist of two: A. ferrite magnetic wires   B. ferromagnetic wires   C. hard magnetic wires   D. non-magnetic wires

 

51.	When current travels along a conductor, a magnetic field: A. produces along the conductor   B. surrounds the conductor   C. opposes the current flowing through the conductor   D. will not produce along the conductor

 

52.	If the flux around two straight conductors carrying current is in the same direction, then the flux of each conductor unites to form a single flux: A. around both conductors   B. between both conductors   C. towards both conductors   D. away from both conductors

 

53.	If a straight conductor is bent to form a loop, the strength of the flux inside the loop is due to the magnetic field generated by: A. the left side of the loop   B. the right side of the loop   C. each side of the loop   D. the left or right side of the loop

 

54.	The EMF generated in a coil can be determined by: A. e = Blv cosθ   B. e = Blv sinθ   C. e = Bl sinθ   D. e = Bl cosθ

 

55.	In electric circuits, ‘inductance’ is the property of a circuit which creates: A. electromagnetic induction   B. magnetic induction   C. electric induction   D. circuit inductance

 

56.	The movement of pointer in a moving coil meter can work satisfactorily on: A. alternating current   B. direct current   C. both direct current and alternating current   D. less than 2 volts of direct current

 

57.	What is the value of a multiplier if the voltage range of a moving coil meter needs to be extended up to 10 V? The internal resistance of the meter is 100 Ω and FSD occurs at 1mA. A. 10 Ω   B. 100 KΩ   C. 100 Ω   D. 10 KΩ

 

58.	The voltage range of a moving iron meter can be increased by using a: A. series resistor   B. parallel resistor   C. variable resistor   D. variable voltage source

 

59.	Relays are any set of contacts that are operated by a solenoid coil: A. electromagnetically   B. magnetically   C. electrically   D. mechanically

 

60.	The mechanism of a contactor is the same as that of a relay, but is usually meant to operate: A. a d.c. circuit   B. an a.c. circuit   C. both a.c. and d.c. circuits   D. mechanical circuits

 

61.	A contactor is essentially; A. a manual switch   B. a smaller version of a relay   C. a larger, higher current-carrying relay   D. a semiconductor device

 

62.

The operating principle of a d.c. motor is: A. when the two magnetic fields interact, the resulting magnetic field will produce a force   B. a conductor moving in a magnetic field will experience a potential difference   C. a stationary conductor in a magnetic field will experience a potential difference   D. a current flowing through a conductor will produce a mechanical torque

 

63.	Copper loss in a d.c. machine is influenced by: A. current through the coil   B. voltage across the coil   C. flux linking with the coil   D. the rotating speed of the coil

 

64.	Which of the following causes iron loss in a d.c. machine? A. Armature current   B. Eddy current   C. Load current   D. Brush current

 

65.	What does a coil of wire need to do within a magnetic field to produce a waveform with a positive voltage for one half-revolution and a negative voltage for a second half-revolution? A. Rotate   B. Vibrate   C. Move horizontally   D. Move vertically

 

66.	If two inductors are connected in parallel across the a.c. supply, the total inductive reactance of the circuit is reduced in proportion to the: A. increase in supply voltage   B. reduction in current   C. reduction in supply voltage   D. increase in current

 

67.	When an a.c. voltage is applied to a capacitor, current flows in and out of the capacitor at a regular rate, dependent on the: A. supply frequency   B. magnitude of supply voltage   C. magnitude of current   D. value of the capacitor

 

68.	If we connect an inductor in series with an existing inductor, the current flowing in the circuit will experience: A. reduced opposition   B. zero opposition   C. no difference in opposition   D. increased opposition

 

69.	On a.c., the change in current flow produces an induced EMF that opposes it. The effect of this current opposition is called: A. inductive reactance   B. capacitive reactance   C. inductive resistance   D. inductance

 

70.	The value of either a voltage or current waveform expressed at only one instant of time is called the: A. instantaneous value   B. average value   C. RMS value   D. peak value

 

71.	The frequency of a wave is the number of times a wave: A. repeats itself in one minute   B. repeats itself in one second   C. repeats itself in one micro second   D. repeats itself in one millisecond

 

72.	Alternating current (a.c.) is generated when a loop conductor, or coil, is rotated within a: A. magnetic field which has constant flux density   B. distorted magnetic field   C. uniform magnetic field   D. time varying magnetic field

 

73.	The function of tap changer in a transformer auxiliary equipment is: A. to change output voltage   B. to change input voltage   C. to change input current   D. to change input voltage

 

74.	The function of a Buchholz relay in a transformer auxiliary equipment is to: A. detect water bubbles caused by an internal fault   B. detect water bubbles caused by an external fault   C. detect gas bubbles caused by an internal fault   D. detect gas bubbles caused by an external fault

 

75.	The purpose of the core in a transformer auxiliary equipment is to: A. provide a path for the electric field   B. provide a path for the armature current   C. provide a path for the field current   D. provide a path for the magnetic field

 

76.	What is the secondary current of a transformer that has 450 primary turns and 25 secondary turns when it draws a current of 4 A from the supply? A. 4 A   B. 72 A   C. 222 mA   D. 25 A

 

77.	The efficiency of a transformer can be calculated by: A. output/input   B. input/output   C. output/(input + losses)   D. output/(output -losses)

 

78.	The symbol of which type of inductor has a solid line? A. An air-cored inductor   B. A ferrite-cored indictor   C. A laminated-iron-cored inductor   D. An epoxy-resin-cored inductor

 

79.	If there is no solid or dashed line in the inductor symbol, this often means that it is a(n): A. air-cored inductor   B. ferrite-cored indictor   C. laminated-iron-cored inductor   D. iron-powder-cored inductor

 

80.	What type of inductor has a ceramic iron core? A. An air-cored inductor   B. A ferrite-cored indictor   C. An iron-cored inductor   D. An Iron-powder-cored inductor

 

81.

Autotransformers, like other transformers, may be step-up or step-down, meaning the secondary may be: A. a higher or lower voltage than the primary voltage   B. an always-lower voltage than the primary voltage   C. an always-higher voltage than the primary voltage   D. the same as the primary voltage

 

82.

Standard AS/NZS3000 indicates the: A. limitations placed on the use of step-up transformers for general use   B. limitations placed on the use of step-down transformers for general use   C. limitations placed on the use of autotransformers for general use   D. limitations placed on the use of isolation transformers for general use

 

83.	Which transformer has an equal number of turns on the primary and secondary windings? A. An instrument transformer   B. An isolation transformer   C. An autotransformer   D. None of the given answers are correct

 

84.	What control technique can be used to limit the amount of current delivered to a welding rod? A. Changing the resistance   B. Changing the capacitance   C. Changing the conductance   D. Changing the flux

 

85.	The primary of a transformer winding is connected to the: A. electrical supply   B. electrode supply   C. electrical load   D. battery

 

86.	The secondary of a transformer winding is connected to the: A. electrical supply   B. electrode supply   C. electrical load   D. battery

 

87.	Mutual induction is the operating principle of a: A. motor   B. generator   C. alternator   D. transformer

 

88.	The standard for current transformers (IEC 60044 (AS 60044)) specifies: A. one value for current range—5 A   B. two values for current range—1 A and 5 A   C. three values for current range—1 A, 2 A and 5 A   D. four values for current range—1 A, 2 A, 5A and 10 A

 

89.	For single-phase work, AS/NZS1243 specifies a secondary voltage of a potential transformer to be: A. 110 V   B. 220V   C. 230V   D. 120V

 

90.	An autotransformer is limited to a secondary voltage of: A. ± 20% of the primary voltage   B. ± 22% of the primary voltage   C. ± 28% of the primary voltage   D. ± 25% of the primary voltage

 

91.	VDR is commonly used to protect home appliances from: A. voltage surges   B. lightning   C. discharge   D. high current

 

92.	An ESR meter is used to test a(n): A. inductor   B. resistor   C. capacitor   D. wire

 

93.	The power curve in a parallel resistive circuit is sinusoidal in shape, which agrees with the laws of: A. trigonometry   B. super position   C. homogeneity   D. linearity

 

94.	The power in a parallel resistive circuit consists of: A. only negative values   B. only positive values   C. equal positive and negative values   D. unequal positive and negative values