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How does narrowing the bandwidth of a circuit affect the noise level?
True or false? The noise at the output of a receiver is less than the noise at the input. Explain your answer
. A gas turbine plant receives air at 1 bar and 290°K and compresses it to 5 bar. If the temperature of air after compression is 1000°K; find the thermal efficiency of the turbine.
30,000 kg/h of n- butyl alcohol at 99oC is to be cooled to 40oC using water from 35oC to 46oC. Available for the service, is a 1-2 exchanger 48.9 cm I.D. shell with 204 tubes 19.05 mm O.D., 15.75mm ID, 4.88m long arranged on 2.54 cm square pitch. Vertically cut baffles are spaced 12.7 cm apart. Pressure drops of 0.7 kg/cm2 are allowable for both the tube and the shell sides. Find the dirt factor and test the suitability of the unit. Properties Cp (kcal/kg oC) µ , cp n- butyl alcohol at 69.5oC 0.7 0.91 k kcal/ kg m hr 0.142 Water at 40.5oC 1.0 0.70 0.543
Alow car spots car has aday coefficient of 0.29 and frantalace of 1.85m and travelling at 160km/hrs. How much polar is required to Over come are adynamic resistance if g=1.23kg/m?
A piston – cylinder device contains 1.2kg of nitrogen gas at 120kPa and 270C. the gas is now compressed slowly in a polytropic process during which PV1.3 = constant. The process ends when the volume is reduced by one – half. Determine the entropy change of nitrogen during this process.
115V incandescent lamps A and B are connected in series across a 230V
source. If lamp A is rated 75watts and lamp B is rated 50watts, determine
the current drawn by the series connection.
A positively charged dielectric has a charge of 2 coulombs. If 12.5x1018
free electrons are added to it, what will be the net charged on the said
dielectric?
The resistance of a wire is 126.48ohms at 100°C and 100ohms at 30°C.
Determine the temperature coefficient of copper at 0°C.
A 1.0 mm diameter wire is maintained at a temperature of 360◦C and exposed to a convection environment at 40◦C with h=120 W/m2·◦C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.25 mm to produce a “critical radius.” How much of this insulation must be added to reduce the heat transfer by 26.8 percent from that which would be experienced by the bare wire?
