## If all the energy were derived from coal, and each ton of coal makes available 25 x 106 kJ, what would be the amount of coal consumed per year?

In the United States about 80 quads (1 quad = 10 15 Btu) or about 84 x 1015 kJ of energy is consumed each year. Approximately one-fourth of this energy is transformed into electricity and, on the average, about 3 units of energy are needed per unit of electricity.

(a) If all the energy were derived from coal, and each ton of coal makes available 25 x 106 kJ, what would be the amount of coal consumed per year?

(b) If all the U.S. energy consumption were to be supplied in the form of electricity, the electricity were produced from fissioning of uranium 235, and the amount of natural uranium used is about 200 times the amount of the fissioning isotope 235, what would be the annual amount of natural uranium that must be used? Recall that the fission of each atom of uranium 235 yields about 200 MeV or, equivalently, 1 MW day/g.

### Calculate the maximum achievable bridge out-of-balance voltage for an applied torque T of 103 N m given the following

Four strain gauges, with specification given below, are available to measure the torque on a cylindrical shaft 4 cm in diameter connecting a motor and load. (a) Draw clearly labelled….

### Find the gain and phase characteristics of the maintaining amplifier.

A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance….

### calculate the mean velocity of the gas at maximum flow rate

A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is….