WorksheetsICIT: SEQUENCE OF CONTROL+DIRECT AND INDIRECT CONTACT
Total questions: 25
Worksheet time: 13mins
What is the purpose of the kWh (Energy) meter in the AC incoming supply system?
To provide overcurrent protection
To distribute energy to final circuits
To register energy consumption
To isolate and switch the circuit
What are the two forms of electric shock mentioned in SS638: 2018?
Direct and Indirect
Primary and Secondary
Visible and Invisible
Internal and External
What is the purpose of earthed equipotential bonding and automatic disconnection of supply?
Protection against short circuit
Protection against overcurrent
Protection against indirect contact
Protection against direct contact
What is the main characteristic of Class II equipment?
Use of supplementary insulation for safety
Presence of live parts in the equipment
Reliance on basic insulation for protection against electric shock
Connection of exposed metal work to a protective conductor
What is the definition of overload current?
Result of two or more live conductors touching together
Result of a phase conductor touching the protective conductor
Result of adding more loads than the designed condition
Result of a current passing through the body of a person
What is the term used to signify the possible value of short-circuit current at the point where the protective device is installed?
Prospective short-circuit current
Fault current
Residual current
Overload current
Where should fuses and single-pole circuit breakers be installed in systems with earthed neutrals?
In the neutral conductor
In the phase conductors
In the protective conductor
In the earth conductor
What happens if the neutral is fused in a circuit during an overload or short-circuit?
The circuit will operate normally
The live fuse will blow
The circuit becomes safe
The circuit becomes dangerous
What is the purpose of bonding all extraneous conductive parts in an electrical system?
To reduce the insulation resistance
To prevent the flow of current
To create an equipotential zone
To increase the risk of electric shock
What is the most common method of protection against indirect shock?
Use of Class IV equipment
Use of Class III equipment
Use of Class II equipment
Use of Class I equipment
What is the result of two or more live conductors touching together?
Shock current
Earth fault
Short circuit
Overload current
What is the definition of shock current?
Current passing through the body of a person
Result of adding more loads than the designed condition
Result of two or more live conductors touching together
Result of a phase conductor touching the protective conductor
What is the purpose of the main switch or main circuit breaker in an AC incoming supply system?
To provide overcurrent protection
To register energy consumption
To isolate and switch the circuit
To distribute energy to final circuits
What is the function of the distribution board in an electrical system?
To isolate and switch the circuit
To register energy consumption
To distribute energy to final circuits
To provide overcurrent protection
What safety measures can be taken to avoid electric shock?
Ignoring safety protocols
Using insulated tools
Working in wet conditions
Wearing rubber gloves
What is the purpose of the RCD (Residual Current Device) in an electrical system?
To provide overcurrent protection
To register energy consumption
To detect and disconnect faulty circuits
To distribute energy to final circuits
What is the main function of an MCB (Miniature Circuit Breaker) in a circuit?
To isolate and switch the circuit
To measure energy consumption
To provide overvoltage protection
To distribute energy to final circuits
What is the significance of the earth connection in an electrical installation?
To increase the risk of electric shock
To provide a return path for fault currents
To reduce the insulation resistance
To prevent the flow of current
What is the primary function of a residual current device (RCD) in an electrical system?
To provide overcurrent protection
To measure energy consumption
To detect and disconnect faulty circuits
To distribute energy to final circuits
What is the purpose of equipotential bonding in an electrical installation?
To increase the risk of electric shock
To provide a return path for fault currents
To reduce the insulation resistance
To prevent the flow of current
What is the definition of short circuit in an electrical circuit?
Result of two or more live conductors touching together
Result of adding more loads than the designed condition
Result of a current passing through the body of a person
Result of a phase conductor touching the protective conductor
What is the primary purpose of a fuse in an electrical circuit?
To provide overcurrent protection
To regulate voltage levels
To connect different circuits
To store electrical energy
What is the purpose of using a surge protector in an electrical system?
To prevent overcurrent
To protect against voltage spikes
To measure energy consumption
To isolate and switch the circuit
What is the role of a circuit breaker in an electrical installation?
To provide a connection between circuits
To interrupt the flow of current during a fault
To measure voltage levels
To increase the current capacity of the circuit
What is the function of a transformer in an electrical system?
To convert AC to DC
To step up or step down voltage levels
To store electrical energy
To provide overcurrent protection
