What is the primary function of a heat engine?

• Convert electrical energy to mechanical energy
• Convert solar energy to thermal energy
• Convert thermal energy to mechanical energy
• Convert chemical energy to sound energy

Answer explanation

A heat engine converts thermal energy into mechanical energy using fuel combustion.

In an IC engine, where does the combustion of fuel occur?

• Outside the engine
• Inside the engine cylinder
• In a boiler
• In a separate furnace

Answer explanation

In IC engines, combustion takes place inside the engine cylinder.

Which of the following is an example of an External Combustion Engine?

• Petrol engine
• Wankel engine
• Steam engine
• Diesel engine

Answer explanation

Steam engine burns fuel outside the cylinder, making it an external combustion engine.

In Spark Ignition (SI) engines, ignition of fuel occurs due to:

• Heat of compression
• Chemical reaction
• External fire
• Electric spark

Answer explanation

SI engines use an electric spark for ignition of the air-fuel mixture.

Which of the following is a Compression Ignition (CI) engine?

• Petrol engine
• Steam engine
• Diesel engine
• Stirling engine

Answer explanation

Diesel engines ignite fuel by compression of air, typical of CI engines.

Which of the following engine types provides better balance and runs smoothly even at high speeds?

• Inline engine
• Vertical engine
• Opposed engine
• Radial engine

Answer explanation

Opposed engines have horizontally opposite cylinders, improving balance and allowing high-speed smooth operation.

In a 'V' shape engine, the cylinders are arranged at an angle usually equal to:

• 30°
• 45°
• 60°
• 90°

Answer explanation

Cylinders in V engines are typically arranged at a 60° angle for compactness and balance.

Accident is a………..event :

• A Planned
• Expected
• Unplanned and undesired
• Intentional

Answer explanation

Accidents are unplanned and undesired events that may cause injury or damage.

What is meant by reassurance in safety first aid?

• Stay with victim till help
• Not to get panic
• Speaking to victim encouragingly
• Call medical emergencies

Answer explanation

Reassurance in first aid involves calmness and encouraging words to reduce stress.

Removal of fuel from the fire is called:

• Starving
• Cooling
• Smothering
• None of the above

Answer explanation

Removal of fuel from fire is called starving, one method to extinguish fire.