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WorksheetsCable and Electrical Safety Quiz
Total questions: 19
Worksheet time: 10mins
The acronym XLPE refers to a
Plain lead covered earth cable
Mineral insulated cable
Cross linked polyethylene insulated cable
Point on a cable plan where a cable is laid on top of another cable
What type of gas is used in a gas filled cable?
Carbon Dioxide
Oxygen
Helium
Nitrogen
The purpose of screening 3-phase high voltage cables is to
Stop electrolytic action
Control tangential stresses
Provide good earth continuity
Give extra mechanical protection
On a cable plan the letters ABSD may appear. This would refer to
Aerial bundled steel distributer
Air blast system disengager
Air break switch disconnector
Aerial balanced safety distancer
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
By cable spiking what potential risk is being controlled or minimised
moisture
flashover
Results in deterioration
puncture
The full form of PILCSWA in Underground cables refers to
Plastic insulated lead covered steel wire armoured cable
Plastic insulated laminated copper steel wire armoured cable
Paper insulated lead covered steel wire armoured cable
Paper insulated lead conductor steel wire armoured cable
One method of testing for moisture in oil is by
Hygroscopic crystals
Litmus paper
A crackle test
Gas produced by a fault
What type of connection is adopted to carry 400 kv HV lines
Star connection with neutral
Delta connection
Star connection without neutral
The essential requirement of an earth electrode system is that it must
Carry fault current indefinitely
Carry a low resistance to atmospheric corrosion
Have a low voltage gradient at the surface of the ground
Have a low electrical resistance
What is the purpose of using a Buchholz relay especially in substations
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
Ensure it trips the transformer considering the gases produced as a fault.
The purpose of multi-break construction for HV circuit breakers is to
Divide the total interrupting duty between several breaks
Divide the open-circuit current between several breaks
Obtain a greatly increased speed of contact separation
Allow the circuit to be interrupted in a sequence of successive breaks
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
What is the basic idea about a fault thrower switch?
Introduces a phase to earth fault for remote tripping of circuit breakers
Automatically moves the fault to another area of the system
Automatically sends a message to the on duty service engineer
Ensures the fault is thrown into status of non-emergency operation
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
The purpose of Buchholz relay is to protect
Acid in the oil due to a fault
Leakage currents
Moisture in the oil
Gas produced by a fault
Cadmium copper addition to the copper conductor in over would lead to the property of the conductor to become
Lighter
A better conductor
Stronger
Less subject to corrosion
Which one of the following would be most likely to cause irreparable damage to a porcelain insulator?
Flashover
Surface
Tracking
Puncture
