432 Q9 Performance

Bigger engines typically operate at lower rpm compared to smaller engines.

• True.
• False.

If you live in Dammam and drive daily to work in Dhahran on the highway, it is better to drive a

• GMC Yukon (large engine)
• KIA Picanto (small engine)

If you always drive within a crowded city like Riyadh, it will be more efficient to drive a large SUV (large engine).

• True.
• False.

A "runaway" engine produces zero brake power because

• the friction power is equal to the indicated power at extreme rpm.
• it is a frictionless engine.
• the indicated power is zero.
• this engine has no clutch (brake).

Higher power in CIEs is obtained by

• approaching stoichiometric F/A
• operating leaner (i.e., less F/A)
• operating rich (i.e., F/A higher than stoichiometric)

Which of the following statements is true?

• Peak torque occurs at lower rpm than peak power.
• Peak torque occurs at higher rpm than peak power.
• Peak torque and peak power occur at the same rpm.
• Torque and power increase linearly with rpm.