KWA REVISION - 28-05-2025

ENGINES & SAFETY

By WINCENTRE CP1

Multiple Choice

_____________ can be caught in belts, pulleys, and other moving parts of the machines.

• Loose clothing

• Long hair

• Jewelry

• All the above

Multiple Choice

Shop clothing is unsafe if it is... 

• loose
• baggy
• flammable
• All of these

Multiple Choice

The student should notify the instructor immediately in case of...

• Accident 
• Defective Equipment
• Injury
• All of these

Multiple Choice

What does PPE stand for?

• Personal Protection Environment

• Public Protection Equipment

• Personal Protective Equipment

• Protective Professional Equipment

Multiple Choice

What is first aid?

• Completing a primary survey

• The first help given to the victim of an accident

• Assessing a victim's vital signs

• Treating a victim for shock

Explanation Slide...

First aid is the immediate and temporary care given to the victim of an accident or sudden illness before professional medical help arrives.

Multiple Choice

During this cycle, the valves are closed, and the connecting rod pushes the piston UP, compressing the air/gas mixture.

• The Intake Stroke

• The Exhaust Stroke

• The Compression Stroke

• The Power Stroke

Multiple Choice

During this cycle, a valve opens as a connecting rod pulls the piston DOWN, drawing the air/gas mixture into the cylinder.

• The Compression Stroke

• The Power Stroke

• The Exhaust Stroke

• The Intake Stroke

Multiple Choice

What is the compression ratio range of CI engines?

• 6 to 10
• 10 to 14
• 16 to 20
• 8 to 12

Explanation Slide...

CI engines typically have a compression ratio in the range of 16 to 20, enabling auto-ignition.

Multiple Choice

What is the purpose of a flywheel in an engine?

• Provides ignition
• Converts fuel to heat
• Smoothens power output
• Increases noise

Explanation Slide...

Flywheel smoothens the power output from the engine by storing rotational energy.

Multiple Choice

What is the usual firing order of a six-cylinder inline IC engine?

• 1-3-4-2-5-6
• 1-5-3-6-2-4
• 1-6-5-4-2-3
• 1-4-3-2-6-5

Explanation Slide...

The standard firing order for inline 6-cylinder IC engines is 1-5-3-6-2-4.

Multiple Choice

What is the standard air-fuel ratio for petrol for complete combustion?

• 12.5:1
• 13.2:1
• 14.7:1
• 15.5:1

Explanation Slide...

The stoichiometric air-fuel ratio for petrol is 14.7:1 for complete combustion.

Multiple Choice

What does CRDI stand for in diesel engines?

• Common Rotary Direct Injection
• Common Rail Direct Injection
• Central Rail Direct Ignition
• Common Rapid Direct Ignition

Explanation Slide...

CRDI stands for Common Rail Direct Injection, a modern diesel injection system.

Multiple Choice

Which injection system is commonly used in petrol engines?

• CRDI
• Throttle Body Injection
• Multi Point Fuel Injection
• Port Injection

Explanation Slide...

MPFI (Multi Point Fuel Injection) is widely used in petrol engines.

Multiple Choice

Which stroke occurs when piston moves from TDC to BDC and draws air-fuel mixture?

• Compression stroke
• Exhaust stroke
• Suction stroke
• Power stroke

Multiple Choice

In a four stroke engine each cylinder has

• One valve

• Two valves

• Four valves

• Three valves

Explanation Slide...

Suction stroke involves drawing air-fuel mixture into the cylinder from TDC to BDC.

Multiple Choice

The term scavenging is generally associated with

• 2-stroke cycle engines

• 4-stroke cycle engines

• aeroplane engines

• 6-stroke cycle engines

Multiple Choice

Two stroke engine has ….. ports

• 2

• 3

• 4

• 2 or 4

Multiple Choice

What is the name of this part?

• Piston

• Connecting Rod

• Camshaft

• Sway Bar Link

Multiple Choice

What is the name of this part?

• Spark Plug

• Ignition Coil

• Spark Arrestor

• Glow Plug

Multiple Choice

What is the name of this part?

• Mini Piston

• Camshaft

• Valve

• Main Cap

Multiple Choice

What is the name of this part?

• Engine Block

• Cylinder Head

• Oil Pan

• Sump