Serious Reliability Training

Transformer IQ Quiz

How much do you know about transformer management?
Are you a keen novice or a seasoned expert? Can your transformer knowledge meet the challenge of this Quiz?

Take the quiz today and find out where you stand. Answer 60 multiple choice questions (with no time limit) and get your score immediately, along with some course recommendations and suggestions on how to fill any gaps in your knowledge.

GOOD LUCK!

IQ Quiz

Step 1 of 13

Phone

This field is for validation purposes and should be left unchanged.

1. Which one of these is not a monitoring and diagnostic test for transformer oil?(Required)

Dissolved Gas Analysis

Dissolved Metals Analysis

Volatility Level Analysis

Furanic Compound Analysis

2. Which gas generated by transformer fault is not a combustible gas?(Required)

Carbon Dioxide

Methane

Hydrogen

Ethylene

3. Typically, the only moving parts in an energized transformer are?(Required)

Secondary Switch Gear

Load Tap Changer

No Load Tap Changer

Voltage Arrestor

4. What is an effective way to dry out a transformer that can't be deenergized or isn't rated for full vacuum?(Required)

Dehydration passes

Vapor dryout

Passive online drying

Cold trap dryout

5. Mineral Oil is used in transformers primarily due to?(Required)

It protects the solid insulation

It disperses heat

It is cost effective

All of the above

6. To generate electricity and induce voltage in a conductor which of the following are needed?(Required)

Motion

Conductor

Magnetic field

All of the above

7. The core steel in a transformer provides a path for?(Required)

Voltage

Current

Magnetic flux

Stray gasses

8. A shell form transformer will have?(Required)

Helical windings

Layer windings

Pancake windings

Disc windings

9. The end of reliable life of solid insulation in a transformer is measured by the?(Required)

Thickness

Density

Weight

Degree of polymerization

10. Referring to the design Hot Spot Temperature of 110⁰C, the aging factor of solid insulation is?(Required)

0.000 0

2.228 5

1.000 0

0.433 7

11. Which of the following will not accelerate the aging of Mineral Oil Dielectric Fluid?(Required)

Heat

Inhibitor

Oxygen

Water

12. For guidance on the Acceptance and Maintenance of Mineral Insulating Oil in Equipment one would refer to?(Required)

ASTM Annual Book of ASTM Standards. Volume 10.03

ISO 55000

IEEE C57.106

NFPA 70E

13. Which of the following would not be considered a routine liquid screen (oil screen) test?(Required)

Furan analysis

Neutralization number

Interfacial tension

Dielectric breakdown voltage

14. Neutralization number and Interfacial tension are both good direct measures of?(Required)

Moisture in oil

Dissolved gases in oil

Oxidation (aging) of the oil

Furanic compounds in the oil

15. At normal design temperatures (110⁰C or less in a normally operated modern transformer) small but measurable concentrations of the following gases will be formed?(Required)

Ethane and methane

Acetylene and ethylene

Carbon monoxide and carbon dioxide

Hydrogen and methane

16. To perform a quantitative analysis of dissolved gas concentrations which method isn't used?(Required)

Rogers Ratio

Duval Triangle

Polarization Ratio

Doernenberg Ratio

17. Analysis for furanic compounds is used to evaluate the condition of the?(Required)

Liquid insulation

Solid insulation

Core steel

Transformer bushings

18. Free breathing transformers can allow both air and moisture into the transformer. It is important to monitor and maintain the?(Required)

Continuous nitrogen system

Bladder in the conservator tank

Winding temperature gauge

Silica gel desiccants

19. Effecting a chemical change in the transformer oil such as removal of oxidation products by use of Fuller’s Earth is best described as?(Required)

Purification

Filtration

Degassing

Reclaiming

20. Use of a cold trap will?(Required)

Trap dissolved gases in the oil

Trap oxidation byproducts

Trap water pulled from the solid insulation

Trap dissolved metals

21. When forecasting needs in the stages of transformer purchasing decisions (acquisition stage) , which document will not be needed?(Required)

C57.12.00

Statement of Purpose

Bill of Particulars

BIL Load Analysis

22. Which of the following would not provide new oil purchase specifications?(Required)

IEEE C57.106

SDMyers

ASTM Annual Book of ASTM Standards, Volume 10.3

Doble Tops

23. A core ground test is performed with a?(Required)

SFRA test set

Insulation power factor test set

TTR

Megohmmeter (Megger)

24. Sweep Frequency Response Analysis (SFRA) should not?(Required)

Compare to factory or pre-transit results

Record transformer load

Detect movement or shifting

Have traces overlay well

25. On-line (inspection while energized) indicators of LTC problems include?(Required)

LTC compartment temperature greater than transformer main tank temperature

Fluid level rising in LTC compartment without an increase in temperature

Flickering lights and/or voltage fluctuations

All of the above

26. Filming compounds will?(Required)

Slow the operation of LTC mechanism and make it work harder

Make operation of the LTC smoother and more efficient

Coat and protect the mechanism from corrosion

Help in quenching the arc

27. You should never attempt to collect a fluid sample from a transformer if?(Required)

The oil temperature is above 70⁰C

An “oil bubble test” indicates the transformer is under vacuum

The transformer is energized

The oil temperature is below 70⁰C

28. When collecting a fluid sample for dissolved gas analysis you should?(Required)

Collect the sample before flushing the valve to be sure you get all the gases

Collect the sample as quickly as possible to avoid losing the gasses

Collect the sample slowly to avoid introducing air bubbles

Collect the sample in a plastic bottle so it won’t break

29. A very similar test to the Insulation Power Factor test is?(Required)

Polarization Index

Tan Delta

Insulation Restance

Core Ground

30. Adding or replenishing oxidation inhibitor is a proactive approach to transformer oil maintenance. An indicator of the need for hot oil cleaning along with adding or replenishing inhibitor is?(Required)

Neutralization number has increased and Interfacial tension has decreased

Moisture content has increased

Dissolved gas analysis indicates a fault condition

None of the above

31. Overheating oil at levels of 500°C will not produce?(Required)

Ethylene

Acetylene

Ethane

Methane

32. What items should be considered when looking at a site for a new transformer installation?(Required)

Environmental impact

Soils Report

Site Survey

All of the above

33. Flood zone checks for a new substation should be performed by?(Required)

Site Engineer (Civil) or Registered Land Surveyor

Electrical Engineer

Mechanical Engineer

Chemical Engineer

34. When the transformer arrives which of the following is not recommended?(Required)

Perform visual inspection

Check impact recorder(s) if present

Perform preliminary electrical tests

Measure contact timing

35. Insulation Power Factor testing is not helpful in determining?(Required)

Movement of the windings (change in capacitance)

Condition of paper insulation (change in watts losses)

Whether the oil test indicates moisture

Turns ratio values

36. An Excitation Current test in the field will help detect?(Required)

Abnormal core grounds, winding faults: short & open circuits, LTC and DETC problems.

Problems with the oil (acid and Interfacial tension)

Dielectric and other oil quality problems.

Degree of polymerization

37. Bushing power factor will not help determine?(Required)

Internal contamination

External contamination

Loss of capacitance (shorted capacitors=increased cap)

Cause of failure

38. A Sweep Frequency Response Analysis (SFRA) Test will help detect?(Required)

Moisture in the windings

Aging by-products

Movement/damage to internal components

Age of the insulation

39. When can you perform a re-inhibit only service?(Required)

When the oxidation inhibitor is depleted and before the oil starts to oxidize

When the acid/neutralization number and IFT/Interfacial tension tests are unacceptable

When the moisture is high

All the above

40. What method is least effective to dry out a transformer with wet insulation?(Required)

Hot oil circulation

Vacuum

Drain and fill with new oil

Passive on-line drying

41. Acceptance testing is not performed to?(Required)

Prove that the transformer received is the one that was ordered

That it was not damaged during shipment

It is suitable for energizing

Calculate remaining useful life

42. For information on electrical testing, one would refer to?(Required)

NETA Maintenance testing specifications

NETA Acceptance testing specifications

C57.152 IEEE Guide for Diagnostic Field Testing of Fluid-Filled Power Transformers, Regulators, and Reactors

All of the above

43. What is not a function of field electrical tests?(Required)

Documents whether storage or movement of a transformer has damaged the unit

Verifies the continued integrity of the transformer at periodic intervals and notes changes

Helps to diagnose the cause of abnormal or unacceptable insulating liquid test results

Determines the amount of oxygen by-products in the oil

44. What is the recommended maximum percent moisture by dry weight (%M/DW) for a new transformer?(Required)

0.50%

1.00%

5.00%

45. What do you need to know to calculate the %M/DW?(Required)

Acid and IFT numbers

D1816 dielectric test value in kV

Parts per million (PPM) moisture and temperature

Power factor number and correction factor

46. Insulation Power Factor can be used to help verify?(Required)

The unit is dry

The unit fit for service

The unit is wet

All of the above

47. The analysis of furanic compounds uses testing of an oil sample to evaluate the condition of?(Required)

The liquid insulation

The solid insulation

The condition of the marzelvane of the Lotus O’delta (LO) winding

All the above

48. What does not cause cellulose molecules (the solid insulation in your transformer) to depolymerize/weaken?(Required)

Heat

Oxygen

Water

Higher Voltages

49. How do you reduce the eddy currents in the core of a transformer?(Required)

Don’t energize it

Use one solid block of steel

Use thin steel sheets or laminations

Increase insulation values

50. What weakens as the oil ages?(Required)

The bushings

The core steel

The paper

Nothing

51. For every 8 °C rise above design you operate a transformer you will cut the life of the transformer by?(Required)

1/4

1/2

3/4

None of the above

52. Temperatures above ___°C, oil will oxidize without free oxygen being present?(Required)

120°

60°

70°

90°

53. Most oil oxidation products are polar compounds causing them to?(Required)

Attack the core steel

Do absolutely nothing

Age the solid insulation

None of the above

54. Where does the moisture in a transformer come from?(Required)

Leaks

Oil and cellulose breakdown

Inadequate drying at factory

All of the above

55. What problem is not caused by high moisture levels in the fluid?(Required)

Turns ratio values deterioration

Electrical failure

Oxidation

Loss of life

56. A fault condition needs to reach what temperature to start forming acetylene?(Required)

150°

300°

450°

700°

57. Degree of Polymerization is?(Required)

Used to calculate the power factor of the transformer insulation

Used to calculate the end of reliable life of the solid insulation

Used to calculate winding resistance of the paper

None of the above

58. SFRA testing is a tool to help locate?(Required)

Core movement

Short circuits

Winding damage

All of the above

59. What other issues could effect a D1816 Dielectric test?(Required)

The phases of the moon

Gases and moisture

BIL Rating

Age of the unit being sampled

60. Removing moisture from a transformer is difficult because?(Required)

All of the layers of paper on the windings

Have to “pull” moisture from inner layers to outer layers where it can be removed

As layers are dried, interface between drier and wetter insulation may act as a barrier

More moisture in hard to dry (polar) cellulose than in easy to dry (nonpolar) oil

All of the above

Your Information

Need help setting up a customized training program for your team? Fill out the information below and a training representative will be in touch soon.

Name(Required)

Email Address(Required)

Phone Number(Required)

Company Name(Required)

Select Job / Role Description

Quiz Progress

0 / 0

Field Inspection

Lab & Diagnostics

Field Services

Fleet Reliability

Serious Reliability Training

Transformer IQ Quiz

IQ Quiz

Your Information

Corporate Office

Get In Touch

Services

Resources

Company

A Good Place Company™

Field Inspection

Lab & Diagnostics

Field Services

Fleet Reliability

Serious Reliability Training

Transformer IQ Quiz

IQ Quiz

Your Information

Corporate Office

Get In Touch

Services

Resources

A Good Place Company™

Different look

Same SDMyers