One gallon of gasoline equals 125,000 Btu; 1 Btu equals 778 foot-pounds of work. One gallon of gasoline is used in pulling a load 10 miles. The force needed to pull the load is 700 pounds. What thermal efficiency does this represent? Express the answer to the nearest tenth percent.
A. 37.3%
B. 38.0%
C. 38.7%
D. 39.1%
Answer: B
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A ____________________ has four independently controllable outputs.
Fill in the blank(s) with the appropriate word(s).
Answer the following statement(s) true (T) or false (F)
1. The torque of a cumulative compound motor for a given current is less than it would be for a shunt motor. 2. The cumulative compound motor has a definite no-load speed and will not build up to destructive speeds if the load is removed. 3. The speed regulation of a cumulative compound-wound motor is inferior to that of a shunt motor and superior to that of a series motor. 4. It is conventional to reverse the current in the field circuits to reverse the rotation of a compound-wound motor. 5. Because the field decreases with a load increase, a differential compound motor has a tendency for load instability.
Explain why Union General William Tecumseh Sherman conducted the devastating "march to the sea" against Confederate forces. Explain in what ways Sherman's march was like conducting modern "total war."
What will be an ideal response?
Air in the brake hydraulic system can cause all of these EXCEPT ________
A) Spongy brake pedal B) May require the driver to "pump up" the brakes before they will stop the vehicle C) Lower than normal brake pedal D) Hard brake pedal