In an AC signal processing circuit, the mean voltage of a half wave rectifier over a...

   

Transcribed Image Text:

In an AC signal processing circuit, the mean voltage of a half wave rectifier over a time period T is given by Vmean =h sin (100mt) dt Calculate the mean voltage over a time period 7 of 0.004s. 9) In a spark ignition engine, a mixture of air and petrol vapour is compressed in a cylinder starting at a volume V of Vstart = 0.04 m to a volume of Vend = 0.008 m. The work done in moving the piston is given by Work done = - 0.008 0.04 PdV where P is the Pressure If the fuel-air mixture behaves as a polytropic fluid under compression and obeys the power law relationship P = 47Vk determine the work done by the piston. 10) When a bearing fails in a vertical boring machine, the rate of temperature rise is observed to be dT dt gte 0.1t where the temperature T is measured in Kelvin and time t is measured in seconds. The initial temperate of the bearing at the moment of failure was recorded as 298 K (25C). By using an appropriate integration method give the equation that describes the temperature T in terms of the time t In an AC signal processing circuit, the mean voltage of a half wave rectifier over a time period T is given by Vmean =h sin (100mt) dt Calculate the mean voltage over a time period 7 of 0.004s. 9) In a spark ignition engine, a mixture of air and petrol vapour is compressed in a cylinder starting at a volume V of Vstart = 0.04 m to a volume of Vend = 0.008 m. The work done in moving the piston is given by Work done = - 0.008 0.04 PdV where P is the Pressure If the fuel-air mixture behaves as a polytropic fluid under compression and obeys the power law relationship P = 47Vk determine the work done by the piston. 10) When a bearing fails in a vertical boring machine, the rate of temperature rise is observed to be dT dt gte 0.1t where the temperature T is measured in Kelvin and time t is measured in seconds. The initial temperate of the bearing at the moment of failure was recorded as 298 K (25C). By using an appropriate integration method give the equation that describes the temperature T in terms of the time t