Exam 6: Power

Two technicians named A and B, each weighing 200 lbs (90 kgs), jog a distance of one mile (1.6 km). Technician A completes the distance in 15 minutes and technician B completes the distance in 20 minutes. Who has done the most work?

330 lb × 100 ft = ____________________ lb/ft per minute = ____________________ lb/ft per second = ____________________ HP

Two identically powered trucks, one loaded and one unloaded, complete a 200 mile journey. The loaded truck has twice the GVW of the unloaded truck and completes the journey averaging 55 mph. The unloaded truck completes the journey averaging 60 mph. Which of the two trucks has done the most work?

A Cummins ISX is rated at 625 BHP. Convert to kilowatts:

What is the rate of performing work known as?

Work = ____________________ × ____________________

What terms do truck diesel engine manufacturers use to rate the power of their engines?

Which of the following correctly identifies torque rise rpm?

What is the force used in a diesel engine to produce mechanical output?

When comparing work accomplished with power, which of the following helps define power but has nothing to do with work?

One hundred Newton meters are equal to:

If the length of a crankshaft throw was changed either up or down, which of the following would be directly affected?

When James Watt was studying draft horse working ability, how much power did he reckon the horse was capable of lifting?

What type of energy does compressed air have?

A Detroit Diesel DD15 engine dynamometer tests at 505 BHP. Convert to kilowatts:

Which of the following is the more accurate way of expressing torque?

In a diesel engine, force is represented by ___________________________________.

Which of the following methods of measuring horsepower when applied to the same engine will usually produce the lowest rating?

Which of the following acronyms is used by manufacturers to indicate actual fuel consumption?

25,450 Btu per hour = ____________________ HP