Unit 264- Quiz

What do you mean by 3 x 1c 300Al XLPE 11KV in a single line diagram?

• 3 times 1 centimetre 300 amps line, unearthed cable

• 3 core plus 1 core 300 amps lead sheathed 11KV cable

• 3 core 300 mm square copper sheathed 11KV cable

• 3 single core 300 mm square aluminium sheathed 11000V cable

What you mean by ‘phasing out’ term in jointing cables would be?

• A system to ensure safe isolation

• The replacement of old colour markings with new ones

• The location of high resistance joints

• A method of ensuring correct phase rotation

Cable spiking is used for

• Ensuring a cable is dead at the point of work

• Prove a cable is live and still in service

• Ensure no current surges are present

• Ensure no voltage surges are present

When handling cold pour resins the mandatory PPE would be

• Overalls and eye protection

• Disposable gloves and breathing apparatus

• Breathing apparatus and overall

• Eye protection and disposable gloves

The instrument used for synchronisation would be.

• Earth impedance tester

• Insulation resistance tester

• Multi-meter

• Test-lamp

Ionisation occurs in a compound-filled cable box due to

• Burning of insulation

• Insulation breakdown

• The existence of voids

• Heating of the compound

Substation interlocks are designed in order to

• Ensure electric shock is prevented as far as is practicable

• Ensure the correct phase sequences are followed all along the system

• Ensure it can be transported over long distances

• Very less maintenance

On-load tap changers incorporate some impedance to prevent

• Short-circuiting the tapping sections

• Open circuiting the tapping sections

• Excessive voltage rise during operations

• Excessive voltage drop during operation

In accordance with the Electrical safety, Quality and continuity regulations, it is not essential to earth all metal work associated with

• Outdoor substations

• Indoor substations

• UG cables

• Overhead lines

The cooling fans of OFAF transformer are switched in and out according to the temperature of the:

• Air surrounding the transformer

• Transformer tank wall

• Transformer windings

• Oil at the bottom of the tank