Section A: Fundamentals of Electrical Safety (Q1–Q20)
-
Why is grounding important in an electrical system?
- a) It enhances voltage output
- b) It improves energy efficiency
- c) It provides a safe path for fault current to flow
- d) It reduces insulation thickness requirementsAnswer: c) It provides a safe path for fault current to flowExplanation: Grounding helps in safely discharging fault current to earth, preventing electric shock and equipment damage.
-
What is the primary risk of contact with live electrical components?
- a) Noise pollution
- b) Heat loss
- c) Electric shock
- d) Voltage surgeAnswer: c) Electric shockExplanation: Contact with live parts can cause electric shock, which can lead to injury or death depending on current and duration.
-
Which part of your body is most vulnerable to electric shock?
- a) Arms
- b) Skin
- c) Heart
- d) LegsAnswer: c) HeartExplanation: The heart is sensitive to electric currents, which can disrupt its rhythm, causing cardiac arrest.
-
What type of insulation is used to prevent accidental contact with live parts?
- a) Air cooling
- b) Paper wrapping
- c) PVC or rubber coating
- d) Metallic enclosuresAnswer: c) PVC or rubber coatingExplanation: Insulating materials like PVC or rubber prevent accidental human contact with conductors.
-
Which of the following units is used to measure electric current?
- a) Volts
- b) Watts
- c) Amperes
- d) OhmsAnswer: c) AmperesExplanation: Current is measured in amperes (A), which indicates the flow of electric charge per second.
-
What does the term ‘live wire’ refer to?
- a) A wire with no voltage
- b) A grounded conductor
- c) A conductor carrying electrical current
- d) A backup circuitAnswer: c) A conductor carrying electrical currentExplanation: A live wire carries voltage and current; touching it can result in shock.
-
Which class of fire extinguisher is safe for electrical fires?
- a) Class A
- b) Class B
- c) Class C
- d) Class DAnswer: c) Class CExplanation: Class C fire extinguishers are designed for electrical fires and do not conduct electricity.
-
Why should electrical panels be kept locked?
- a) To prevent voltage fluctuations
- b) To avoid unauthorized access and accidental contact
- c) To maintain system temperature
- d) To reduce circuit breaker tripsAnswer: b) To avoid unauthorized access and accidental contactExplanation: Locking panels protects unauthorized personnel from injury and ensures system integrity.
-
What does an electrical safety symbol featuring a lightning bolt typically indicate?
- a) Radioactive hazard
- b) Magnetic field zone
- c) High voltage risk
- d) Explosive materialAnswer: c) High voltage riskExplanation: The lightning bolt symbol is a universal warning for electrical hazards and high voltage areas.
-
Which organ can suffer immediate failure due to electric shock?
- a) Liver
- b) Lungs
- c) Heart
- d) KidneysAnswer: c) HeartExplanation: The heart’s rhythm can be disrupted by electric current, potentially causing instant failure.
-
What device is used to automatically disconnect power during an overload?
- a) Transformer
- b) Capacitor
- c) Circuit breaker
- d) FuseAnswer: c) Circuit breakerExplanation: Circuit breakers sense overloads and interrupt current flow to prevent damage or fire.
-
Which type of outlet should be used in wet environments like bathrooms?
- a) Standard outlet
- b) GFCI outlet
- c) DC outlet
- d) Dual-phase outletAnswer: b) GFCI outletExplanation: Ground Fault Circuit Interrupters detect imbalance in current and cut power quickly to prevent shock.
-
Why should you never use water on an electrical fire?
- a) Water corrodes metal
- b) Water causes sparks
- c) Water conducts electricity and may worsen shock risk
- d) Water cools the fire too quicklyAnswer: c) Water conducts electricity and may worsen shock riskExplanation: Water is conductive and can spread current, endangering the person trying to extinguish the fire.
-
What is PPE in electrical safety?
- a) Power Phase Equipment
- b) Personal Protective Equipment
- c) Protective Power Enclosure
- d) Portable Power EngineAnswer: b) Personal Protective EquipmentExplanation: PPE includes gloves, face shields, and insulated tools to protect individuals from electrical hazards.
-
Why are insulated tools important for electricians?
- a) They are lightweight
- b) They reduce hand fatigue
- c) They prevent electric current from passing to the user
- d) They are cheaper than regular toolsAnswer: c) They prevent electric current from passing to the userExplanation: Insulated tools provide a barrier between the user and live components, minimizing shock risk.
-
What is the minimum safe distance from overhead power lines (Up to33KV) ?
- a) 1 meter
- b) 3 meters
- c) 5 meters
- d) 10 metersAnswer: b) 3 metersExplanation: Maintaining at least 3 meters ensures safety from accidental arc or contact.
-
Which color wire is typically used for grounding in electrical systems?
- a) Red
- b) Green or Green-Yellow
- c) Black
- d) BlueAnswer: b) Green or Green-YellowExplanation: Green or green-yellow wires are universally used for earth or ground connections.
-
Which of the following protects against leakage currents?
- a) MCB
- b) MCCB
- c) RCCB
- d) Surge ArrestorAnswer: c) RCCBExplanation: Residual Current Circuit Breakers detect leakage and disconnect supply quickly to prevent shock.
-
What is arc flash?
- a) Voltage drop in circuits
- b) Bright light from CFLs
- c) Intense electrical discharge causing light and heat
- d) Reflection from insulatorsAnswer: c) Intense electrical discharge causing light and heatExplanation: Arc flash is a dangerous event that can result in severe burns or equipment damage.
-
Which type of gloves should be worn when working on energized equipment?
- a) Cotton gloves
- b) Leather gloves
- c) Insulating rubber gloves
- d) Nylon glovesAnswer: c) Insulating rubber glovesExplanation: These gloves are tested to resist high voltage and protect against electric shock.
💡 Looking to boost your technical knowledge for interviews? Don’t miss our detailed Q&A on Top Electrical Engineering Interview Questions and Answers.
Electrical safety quiz, electrical safety questions, electrical safety MCQ, electrical safety for engineers, safety questions with answers, electrical engineering quiz