Acompound gear train is composed of four
gears: a, b, c, and d. gear a has 120 teeth. gear
b has 12 teeth and shares a shaft with gear c,
which has 24 teeth. gear c is meshed with gear
d, the output gear. power is supplied at gear a
with 200 ft. ib of torque and is traveling at 400
rpm. with a system output of 400 ft lb, how
many teeth should gear d have?
a.720
b.900
c.480
d.256

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?