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Utesh session exam

Total questions: 99

Worksheet time: 1hrs 14mins

Name
Class
Date
1.

Dielectric faults occur in the winding due to_____

a)

turn-to-turn short circuit

b)

copper losses

c)

turn-to-turn insulation breakdown

d)

turn-to-turn conductor breakdown

2.

Mechanical faults of winding failure are the________

a)

distortion, loosening or displacement of the windings

b)

vibration, loosening or displacement of the windings

c)

distortion, overheating or displacement of the windings

d)

distortion, loosening or displacement of the conductors

3.

Bushes are insulating devices that insulate a high voltage electrical insulator to pass through an _______

a)

earth conductor

b)

windings

c)

insulator

d)

none of the above

4.

Which device in the motor causes the tap changer to fail to control its direction movement in Tap Changer Failure

a)

old capacitors or burned-out capacitor

b)

old reactors or burned-out reactors

c)

old reactors and capacitors

d)

old relays

5.

The _____ reaches the core surface which is in direct contact with the windings in the core failure

a)

short-circuit

b)

open circuit

c)

over-loading

d)

over-heating

6.

The Priority Number (PN) of Tank Failure is __

a)

18

b)

19

c)

6

d)

6 to 30

7.

Protection systems include the_____, pressure relief valve circuitry, ____and Sudden Pressure Relays.

a)

buchholz protection, Short-circuit protection

b)

surge Protection, Open-circuit protection

c)

buchholz protection, Surge Protection

d)

insulation Protection, Surge Protection

8.

Low level oil due to leakage causes the Buchholz protection to come into action even if there is not a fault which is not needed and waste of energy.

a)

True

b)

False

9.

From what protects Pressure relief valve circuitry in Protection system Failure?

a)

transformer from exploding due to gas pressure

b)

transformer from over voltage by allowing specific magnitude of voltage to go to transformer

c)

transformers from blowing up from sudden exponential increase of gas pressure

d)

None of the above

10.

Cooling system can perform wrong due to bad ____ which measure the heat in the transformer.

a)

rheostat

b)

thermostat

c)

thermometer

d)

dosimeter

11.

In an electric power system, ____is the combination of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment.

a)

substations

b)

RCD

c)

switchgear

d)

automatic switch

12.

What means this symbol

a)

location of fault

b)

PT

c)

fuse

d)

none of the above

13.

For an Electromechanical Type Relay / Switchgear , testing will include:

a)

specialist equipment may be needed to interrogate the relay to determine if any internal errors have been detected

b)

the manufacturer’s instructions should be referred to for guidance

c)

checking oil level

d)

checking that magnet gaps and the induction disc are clean

14.

What kind of equipment

a)

11 kV oil switch

b)

11 kV oil fuse switch

c)

11 kV vacuum circuit breaker

d)

11 kV of circuit-breaker panel

15.

What actions should be applied to eliminate the Managing Risk of Switchgear Failures?

a)

replace switchgear, refurbish switchgear parts, retain switchgear and review maintenance

b)

replace switchgear, refurbish switchgear parts

c)

replace switchgear, throw away switchgear parts, retain switchgear and review maintenance

d)

replace switchgear, refurbish switchgear parts, sale switchgear and review maintenance

16.

Factors Determining Maintenance Requirements of an Electrical Component/Plant:

a)

Power quality, Variable Frequency Drive, Mechanical and Improper installation factors

b)

Voltage drop, Variable Frequency Drive, Electrical and Improper installation factors

c)

Power quality, Variable Frequency Drive, Thermal and Improper installation factors

d)

Voltage drop, Variable Frequency Drive, Thermal and Improper installation factors

17.

What kind of factor consists of Power quality in requirements for maintenance?

a)

Operational overloads

b)

Misalignment

c)

Harmonic Distortion

d)

Soft foot

18.

What kind of factor doesn't consist of Variable Frequency Drives in requirements for maintenance?

a)

Reflections on drive output PWM signals

b)

Sigma current

c)

Operational overloads

d)

Voltage Imbalance

19.

What kind of factor consists of Mechanical requirements for maintenance?

a)

Reflections on drive output PWM signals

b)

Operational overloads

c)

Bearing wear

d)

Pipe strain

20.

What kind of factor doesn't consist of Improper installation in requirements for maintenance?

a)

Soft foot

b)

Pipe strain

c)

Shaft voltage

d)

Sigma current

21.

A numerical value called Priority Number (PN) is assigned to each fault which depends on the fault value.

a)

True

b)

False

22.

The maximum number of Priority Number(PN) is__

a)

150

b)

200

c)

120

d)

30

23.

Transformer Faults consists of___

a)

Winding failure, Bushing Failure, Tap Changer Failure, Core failure, Tank Failures, Protection system Failure, Cooling system failure

b)

Iron losses, Copper losses, Insulation failure

c)

Winding failure, Core failure, Protection system Failure, Cooling system failure

d)

Winding failure, Bushing Failure, Tap Changer Failure, Core failure, Tank Failures, Cooling system failure

24.

Transformer Faults consists of___

a)

24 to 48

b)

6 to 30

c)

12 to 120

d)

22 to 64

25.

Leakage happens because of environmental stress,  high humidity and sun radiation

a)

True

b)

False

26.

All wiring systems shall be tested for continuity of circuits, short circuits and earthing ____ wiring is completed and ____ energizing.

a)

after, before

b)

before, after

c)

after, after

d)

before, before

27.

A alternating current pressure of not less than twice the working pressure provided that it does not exceed 660 V for medium voltage circuits.

a)

True

b)

False

28.

Low resistance measurements in Continuity tester are required to prevent _____ damage to existing equipment and to _____ energy wasted as heat.

a)

long term, maximize

b)

short term, equalize

c)

short term, maximize

d)

long term, minimize

29.

Which equipment works to make sure that the circuit is disconnected fast enough to prevent overheating and possibly a fire

a)

RCD tester

b)

Continuity tester

c)

Loop Impedance tester

d)

Multimeter

30.

Which device operates on the principle of continuously monitoring the balance of currents between the Line conductor and the Neutral conductor

a)

RCD tester

b)

Continuity tester

c)

Loop Impedance tester

d)

IR tester

31.

Insulation resistance testers are designed to prevent hazards such as electric shock and short-circuits caused when the insulation in electrical devices degrades over long periods of use.

a)

True

b)

False

32.

The voltage indicator should not  be able to work without the need for a battery

a)

True

b)

False

33.

Which tool has clamping jaws that can grip wire conductors?

a)

Wand Voltage Meter

b)

IR tester

c)

Test lamp

d)

Digital Clamp Multimeter

34.

A Wand Voltage Meter includes wire leads similar to those found in a multimeter, which can be used to measure voltage or presence of current by touching the leads to bare wires or plastic contacts.

a)

True

b)

False

35.

If you touch the two probes of the Continuity tester  together, the circuit will be ____ and light is illuminated on the body of the tester, indicating a ____ circuit.

a)

negative, endless

b)

complete, complete

c)

endless, complete

d)

positive, endless

36.

What is the most versatile electrical equipment?

a)

IR tester

b)

Clamp Multimeter

c)

Multimeter

d)

Wand Voltage Meter

37.

Select the factor of which the accompanying injury electric shock depends

a)

The path of the current through the body of the equipment

b)

The pose at which person lies

c)

The amount of resistance passing through the injured person

d)

The length of time a person is subjected to the current

38.

What is the value of resistance in case of wet hands?

a)

1000 Ohm

b)

100 Ohm

c)

100000 to 600000 Ohm

d)

400 to 600 Ohm

39.

Electric shock occurs when the body becomes part of an electrical circuit.

a)

True

b)

False

40.

At which value of current person will have lose of muscular control

a)

10 to 30 A

b)

30 to 75 mA

c)

10 to 30 mA

d)

1 A

41.

For 277/480 V AC power, the neutral power is colored ___ while the earth is colored ___

a)

red, yellow

b)

gray, green

c)

orange, green

d)

brown, white

42.

What kind of procedures should be performed at all times before commencing electrical maintenance and repairs?

a)

Checking of relay system

b)

Checking the presence of all equipment

c)

Log out Tag out

d)

Checking for the presence of moisture

43.

At which value of current person can die from loss of heartbeat

a)

4 A

b)

1 A

c)

33 mA

d)

0.4 A

44.

Remember to maintain a minimum distance of 10 feet from overhead power lines and nearby equipment

a)

True

b)

False

45.

For 120/208/240 V single phase cables, the live cable is black, the neutral cable is blue and the protective earth can be green, bare or striped green and yellow in color

a)

True

b)

False

46.

In which countries Neutral wires indicate as white color?

a)

USA and Australia

b)

Canada and UK

c)

USA and Canada

d)

Europe and UK

47.

Why do we use Infrared thermography?

a)

to find areas of excess heat caused by increased resistance

b)

to find areas of burns caused by decreased voltage

c)

to find areas of less pressure caused by increased current flow

d)

to find areas of excess heat caused by decreased voltage

48.

When electricity flows through a circuit, it must find a path to ____

a)

consumers

b)

phases

c)

utilities

d)

earth

49.

Which case of damage is shown in the picture?

a)

bented capacitor

b)

tangled resistor

c)

exploded capacitor

d)

overloaded inductor

50.

Earthing also acts as a reference point for the electrical source and safety devices to correctly work.

a)

True

b)

False

51.

The substation consists of …

a)

High voltage switchgear

b)

Power transformer

c)

Low voltage switchgear

d)

All of them

52.

What kind of distribution substation is a central substation to which electricity is supplied from the power system at a voltage of 110 to 220 kV?

a)

Nodal distribution substation

b)

Main step-down substation

c)

Load-center substation

d)

Transformer point

53.

How many methods of connecting transformer substations exist?

a)

4

b)

3

c)

5

d)

2

54.

Which method of connecting the transformer substation is supplied by a separate line?

a)

Passage

b)

Branch

c)

Dead-end

d)

Tie

55.

Which substations are located near the largest energy-intensive industries and buildings with a concentrated load?

a)

Main step-down

b)

Nodal

c)

Transformer point

d)

Deep input(entry)

56.

A transformer station is a substation with a primary voltage of …

a)

35kV, 10kV or 6kV

b)

400 and 230 V

c)

230kV

d)

400 kV

57.

The secondary voltage of a transformer substation is …

a)

35kV, 10kV or 6kV

b)

400 and 230 V

c)

230kV

d)

400 kV

58.

The number of installed transformers in a substation depends on the consumer category.

a)

True

b)

False

59.

Name the popular techniques for locating faults in underground cables.

a)

Cable thumping and TDR

b)

High voltage radar method and TDR

c)

Murray and Varley loop test

d)

Murray and cable thumping

60.

A cable thumper uses ... to inject 25 kV into the faulty cable.

a)

AC surge generator

b)

DC motor

c)

AC motor

d)

DC surge generator

61.

A cable thumper is used only in … faults.

a)

open circuit

b)

short circuit

c)

overload

d)

symmetrical

62.

Which method for locating underground cables fault is the most accurate?

a)

Murray loop test

b)

TDR

c)

Cable thumping

d)

High voltage radar method

63.

Name one of the correct disadvantages of the cable thumping method for locating underground cables faults.

a)

difficult to use

b)

inaccurate

c)

ineffective

d)

only used for relatively short distances

64.

TDR method for locating underground cables fault is abbreviated as …

a)

Time Domain Reflectometer

b)

Time Delay Relay

c)

Time Data Reflectometer

d)

Time Domain Relay

65.

A TDR method for locating underground cables fault measures the time taken by the signal to reflect from the point of change in …

a)

Voltage

b)

Impedance

c)

Supply current

d)

all of them

66.

In what cases is the TDR method for locating underground cables fault used mostly?

a)

open circuit

b)

phase to ground

c)

open circuit and conductor to conductor short 

d)

phase to phase

67.

To identify high resistance ground faults in finding underground cable faults the … is used instead of TDR method.

a)

Murray loop test

b)

Varley loop test

c)

Cable thumping method

d)

High Voltage radar method

68.

How many popular techniques does the high voltage radar method have?

a)

3

b)

2

c)

4

d)

7

69.

The arc reflection technique of high voltage radar method uses a TDR with a …

a)

filter

b)

filter and a thumper

c)

generator

d)

thumper

70.

The arc reflection filter protects the TDR itself from …

a)

intense pulses

b)

low voltage signals

c)

high voltage surge

d)

all of them

71.

In surge pulse reflection method, a thumper is indirectly connected to the cable without a filter which can limit both the voltage and current applied to the fault.

a)

True

b)

False

72.

Most often nodal distribution substations are under the … of the organization that provides electricity.

a)

 jurisdiction

b)

responsibility

c)

supply

d)

all of them

73.

The two transformers are installed in substations where consumers of … category are powered

a)

3

b)

1 and 2

c)

4

d)

3 and 4

74.

A dead-end substation is usually … in the main circuit with … supply.

a)

the last, two-sided

b)

the first, one-sided

c)

the last, one-sided

d)

the first, two-sided

75.

______are characterized by the inclusion in the cut (in the passage) of the main power line, when both the input and the output of the line take place.

a)

complete transformer substations

b)

passage substations

c)

dead-end substations 

d)

tapping substations

76.

The purpose of the deep entry substation is to protect a group of installations of a particular enterprise or a separate facility at this enterprise.

a)

True  

b)

False

c)

none of the above

77.

What is a measurement of a low resistance measurement across standing voltage?

a)

1000 Ohm  

b)

1 Ohm

c)

50Ohm

d)

12Ohm

78.

Balance of currents between line and neutral conductor is function of which test equipment?

a)

Loop impedance tester  

b)

Voltage indicator 

c)

RCD tester

d)

Insulation resistance tester

79.

Lower insulation resistance values indicate more effective insulation

a)

True

b)

False

80.

Which direct current pressure of not less than twice the working pressure provided that it does not exceed …  for medium voltage circuits multi meter has ability grip wire conductors?

a)

continuity tester

b)

digital clamp

c)

simple multi meter

d)

PFC tester

81.

Method where a thumper is directly connected to the cable without a filter which can limit both the voltage and current applied to the fault is called ___.

a)

Voltage Decay Reflection Method

b)

Surge Pulse Reflection Method

c)

High Voltage Radar Methods

d)

Arc Reflection Method

82.

What kind of high resistance value TDR can not see ground fault?

a)

above 200 Ohm

b)

above 250Ohm

c)

up to 240 Ohm

d)

125Ohm

83.

The reflections are traced on a ____ display with amplitude on y-axis and the elapsed _____ on x-axis.

a)

LED, time 

b)

TDR, value

c)

graphical, time

d)

horizontal, weight

84.

The Murray and Varley loop tests are____.

a)

techniques

b)

parts

c)

measuring devices

d)

no answers

85.

If you supply a sufficiently high voltage to the faulty cable, the open-circuit fault will break down creating a high-current arc so what kind of high voltage is applied?

a)

up to 125 kV

b)

up to 1kV  

c)

66kV

d)

25 kV

86.

The PN number of the core failure is ____.

a)

6

b)

24 to 48

c)

12

d)

14

87.

What kind of equipment?

a)

an 11 kV oil-filled tank ring  

b)

11 kV oil fuse switch    

c)

415V air circuit-breaker

d)

33 kV fixed-pattern vacuum circuit-breaker

88.

Improper installation factors:

a)

operational overload

b)

shaft voltage

c)

bearing wear  

d)

soft wear

89.

The insulation resistance measured as above shall not be less than 50 mega ohms multiplied by the number of points on the circuit provided that the partly installation shall not be required to have an insulation resistance greater than one mega ohm.

a)

True

b)

False 

c)

Not given

90.

A direct current pressure of not less than twice the working pressure provided that it does not exceed …  for medium voltage circuits

a)

560V

b)

220V

c)

660V

d)

480V

91.

Symbol of external fault loop impedance?

a)

Zs

b)

Ze

c)

K

d)

R

92.

… is a device that is powered by batteries and has a probe at one end and a cord with either an alligator clip or another probe at the other end. If you touch the two together, you complete a circuit and light is illuminated on the body of the tester, indicating a complete circuit.

a)

Transformer

b)

Capacitor

c)

Solenoid Voltage Tester

d)

Continuity Tester

93.

Which device combines the function of a multimeter with a current sensor.

a)

Digital Clamp Multimeter

b)

A Wand Voltage Meter

c)

Solenoid Voltage Tester

d)

A Multi-meter Tester

94.

The most versatile of electrical tester

a)

Insulation Resistance tester

b)

Multimeter

c)

Clamp meter

d)

Wand voltage meter

95.

What kind of instrument?

a)

insulation resistance tester

b)

earth electrode resistance tester

c)

continuity tester

d)

solenoid voltage tester

96.

A continuity tester is a device that is powered by batteries and has a probe at one end and a ___ with either an alligator clip

a)

core

b)

pointer

c)

cord

d)

leads

97.

Why is regular domestic RCD set to a 30mA limit?

a)

because of British Standards relating RCD

b)

because switchboard operates on 30mA

c)

reason for this is because the human body can withstand a current of that level

d)

because of low voltage

98.

How does a residual current device work?

a)

on the principle of emf

b)

on the principle of continuously monitoring the balance of currents between the Line conductor and the Neutral conductor

c)

degradation of the insulation between charged and non-charged portions of electrical devices and equipment

d)

by balancing two phases

99.

Greater …… creates more magnetism pulling the solenoid's core in further against the spring loading, moving the pointer.

a)

voltage

b)

current

c)

resistance

d)

impedance

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