The voltage detected by a radio is modeled as a random variable Y. When there is no transmit signal, the voltage is uniformly distributed between -2V and 2V. When there is a transmit signal, the voltage is between 0V and 3V.
dispersed properly. Suppose a signal is transmitted with probability 0.75 (or no signal transmitted with probability 0.25).
a. Find the probability density function of Y.
b. If the sensed voltage is Y = 1.5V, find the probability that the transmit signal will reach its location.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Compute the pressure drop of 30°c air flowing with a mean velocity of 8 m/s in a circular sheet-metal duct 300 mm in diameter and 15 m long. use a friction factor, f 0.02, and pair = 1.1644 kg/m a. 37.26 pa b. 25.27 pa n c. 29.34 pa d. 30.52 pa

Inadequate stores control is not an obstacle to effective work order system. (clo4) a)-true b)-false