## determine the maximum outside temperature (F) for which the inside can be maintained at 70 F.

A heat pump is to be used to heat a house in winter and then reversed to cool the house in summer. The interior temperature is to be maintained at 70 F. Heat transfer through the walls and roof is estimated to be 1400 Btu/hr per degree temperature difference between the inside and outside.

A. If the outside temperature in winter is 35 F, determine the minimum power (Btu/hr) required to drive the heat pump.

B. If the power input is the same as in Part A, determine the maximum outside temperature (F) for which the inside can be maintained at 70 F.

C. If the outside temperature in winter is 35 F, and the house is to be heated electrically, determine the power (kW) required.

### 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….