WorksheetsElectrical Engineering Quiz
Total questions: 30
Worksheet time: 18mins
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.
Which of the following is a common method for cooling transformers?
Air cooling
Oil cooling
Gas cooling
Water cooling
What type of gas is used in a gas filled cable?
Carbon Dioxide
Oxygen
Helium
Nitrogen
Which of the following materials is typically used for the insulation of high-voltage cables?
Polyethylene
Wood
Rubber
Glass
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.
Cable spiking minimizes the risk of.
What is the primary purpose of using a lightning arrester in electrical systems?
To protect the system from lightning-induced surges
To increase the system's voltage capacity
To stabilize the system's frequency
To decrease the system's current flow
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
For lightening protection, a simple form of supply system mounted on pylons would be
A surge diverter
An expulsion gaps
A surge inverter
An over-running earth wire
What type of connection is adopted to carry 400 kv HV lines
Star connection with neutral
Delta connection
Star connection without neutral
In a 132 KV overhead line conductor approximately how many strands would be there
7
19
37
59
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
Off-load tap changers are designed in distribution system is to
Control output voltage at full load
Allow for future increase in load
Reduce output voltage at periods of light load
Permit nominal output voltage to be maintained
In overhead lines wood pole supports are used in the voltage ranges between
11 KV-33KV
11KV-66KV
230V-230KV
230V-66KV
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 construction of all overhead lines is covered by what code of practice
BS code of practice 1320
BS code of Practice 321
The electricity regulations
The electricity at work regulations
The purpose of a low earth fault loop impedance is to
Ensure a good earth fault path load current
Prove the earth is a complete loop circuit
Equalise sufficient current will flow to operate protective devices
Ensure protective multiple earthing is effective in event of earth fault
Excessive corona on 400 KV overhead lines could be an indication of
Broken stands or spacers
Interference caused by a kite string
Exceptionally dry weather conditions
An over-running earth wire
The neutral of a three phase four wire connection from a secondary transformer is connected to earth is to ensure
Obtain the line voltage
Maintain the neutral at earth potential
Enable the transformer core to be earthed
Protect the consumer from dangerous voltage
The approved instrument used for testing correct connection in PME cut out would be
Polarity meter
Testoscope
Phase rotation meter
Insulation resistance meter
Before filling the insulating oil in an HV switchgear what needed to be tested
Viscosity
Specific gravity
Carbon deposit
Dielectric strength
Preventive maintenance is to ensure
Make sure all faults will occur at a certain time
Allow new transformers to be purchased on time
Ensure there will be never be any faults on the system
Maximise uptime and continuity of service
In a tension insulator the compression joints are filled with graphite grease to
Allow the conductor to move more easily
Improve the insulation of joint
Improve holding capacity
Prevent corrosion
What is the main purpose of using a circuit breaker in an electrical circuit?
To reduce the circuit's inductance
To automatically interrupt current flow in case of a fault
To increase the circuit's resistance
To provide a path for current flow
Metals are earthed and bonded in order to create
An equipotential zone
A potential equidistant zone
Equalise potential between phases
Equilibrium potential between phases
While an unarmoured lead sheathed cables are laid in the ground, they should
Be encased in concrete
Always be drawn in ducts
Be surrounded by sand or similar graded material
Be back filled with excavating soil with no specific precautions taken
Which one of the following represents a star connected transformer winding?
1
2
3
4
