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WorksheetsEET417 Quiz 1
Total questions: 20
Worksheet time: 18mins
What is the most commonly used insulating materials for low and medium-voltage cables?
Porcelain
Silicone rubber
Polyvinylchloride
Nomex
Which one of the following is NOT a form of insulators?
Liquid
Gas
Solid
Foam
Please select apparatus(es) that could benefit from the application of insulation.
Circuit breakers
Power transformers
Power capacitors
High voltage bushing
How many principal areas where the application of insulation in a power transformer is needed?
3
4
5
6
Name the principal area labelled as 'd' in the figure.
turn to turn insulation
high voltage coil to low voltage coil insulation
low voltage coil to earth insulation
coil to coil insulation
The insulator in cables should have
low dielectric constant and low power factor
low dielectric constant and high power factor
high dielectric constant and high power factor
high dielectric constant and low power factor
Why does PVC is NOT suitable as an insulator for high voltage cable?
High dielectric constant and high loss
High dielectric constant and low loss
Low dielectric constant and low loss
Low dielectric constant and high loss
The required properties for an insulation paper in power capacitor application are
high dielectric strength and high dielectric constant
high dielectric strength and low dielectric constant
low dielectric strength and low dielectric constant
low dielectric strength and high dielectric constant
Which one from the list below is NOT the types of a treated paper insulator in high voltage bushing application?
Resin-bonded paper (RBP)
Resin-impregnated paper (RIP)
Oil-bonded paper (OBP)
Oil-impregnated paper (OIP)
The transformer should be in the liquid state over the complete operating range of temperatures between
-50℃ and +10℃.
-50℃ and -40℃.
-140℃ and +150℃.
-40℃ and +50℃.
Power capacitors are used for
automatically opens the circuit when a critical current or voltage rating is exceeded
voltage regulation of power transmission systems
the improvement of the power factor of power distribution networks
power factor correction in high-frequency heaters and induction furnaces
In high voltage cable, the best material for high voltage and high temperature is teflon which can be employed up to (a) ℃.
What is the main insulation for small size motor?
Pressboard
Teflon
Nylon
Silicone rubber
Based on the International Electrotechnical Commission, which material has the temperature limit of 90℃?
Mica
Natural rubber
Silk
Fibreglass
What is the main insulation of the stators?
SF6
Silk
Mica
Rubber
The insulating materials are grouped into different classes based on __________.
current limit
temperature limit
voltage limit
time limit
Organic materials with or without impregnation are grouped in ___ & ___ class.
O, A
A, B
B, C
C, O
Which insulation has greater dielectric strength than paper and requires less stress control at voltages below 25 kV?
Rubber
Mica
Cotton
Resin
Which high voltage device is using prepregs as an insulator?
Power capacitor
Circuit breaker
Oil-filled transformer
Dry-type transformer
Which insulation material in the rotating machine that is used as support between the winding bars, slots and the core lamination?
Glass fiber reinforced epoxy
Synthetic resin bonded paper
Oil-impregnated paper
Non-woven polyester
