Engine Performance Analysis Questions

The video tutorial explains engine performance characteristic curves, which graphically represent an engine's performance through actual test runs. It covers torque, power, and fuel consumption curves against engine speed, all under full throttle conditions. Torque initially increases with speed but decreases after a peak due to reduced charge induction. Indicated power rises with speed, but brake power's increase slows due to friction. Fuel consumption rises with speed, and brake specific fuel consumption (BSFC) initially drops, stabilizes, and then increases due to frictional power at high speeds.

What are engine performance characteristic curves used for?

• To measure the size of an engine

• To graphically represent an engine's performance

• To determine the color of engine parts

• To calculate the cost of engine maintenance

Which of the following is NOT a curve used to represent engine performance?

• Torque versus engine speed

• Power versus engine speed

• Fuel consumption versus engine speed

• Temperature versus engine speed

In the torque versus engine speed curve, what happens to torque after reaching a peak?

• It remains constant

• It decreases with further increase in speed

• It fluctuates randomly

• It increases indefinitely

What happens to the charge inducted per cylinder at the speed where torque is maximum?

• It is zero

• It fluctuates

• It is maximum

• It is minimum

Why does the increase in brake power decrease with engine speed?

• Due to a decrease in engine cycles

• Because of increased frictional power

• Due to a decrease in fuel consumption

• Because the engine size reduces

What is the relationship between indicated power and engine speed?

• Indicated power decreases with engine speed

• Indicated power fluctuates with engine speed

• Indicated power remains constant

• Indicated power increases with engine speed

What happens to fuel consumption as engine speed increases?

• It increases

• It remains constant

• It fluctuates

• It decreases

What is the initial trend of brake specific fuel consumption (bsfc) as engine speed increases?

• It fluctuates

• It remains constant

• It decreases

• It increases

What causes the increase in bsfc at very high speeds?

• Decrease in engine size

• Increase in frictional power

• Decrease in fuel quality

• Increase in engine temperature

What can be plotted on a single plot against engine speed?

• Brake power, torque, and bsfc

• Fuel type, engine type, and speed

• Temperature, pressure, and volume

• Engine size, color, and weight