Combustion occurs at a constant specific volume in a spark-ignition engine because a. mass flow into the engine is adjusted to compensate for the change in volume created by the moving piston b. the piston stops when it reaches tdc until combustion is completed c. combustion occurs so quickly that the change in cylinder volume is negligible during this time d. this is incorrect! combustion must occur at constant pressure. e. a and b

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false