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1. Analyze the probable cause of the following problems in motors and suggest remedial measures:
a. A motor driving a pump often fails to start and trips with indication of overload. The electrical parameters are normal. The observation is that every time this happens the delivery valve is fully open.
b. The motor driving a rotary cement kiln fails repeatedly and every time the insulation is found to have burnt out. It is observed that this happens only during summer when the temperature is close to 45 Deg C.
c. A compressor motor being switched on for the first time rotates in the reverse direction.
d. A bulk ore handling conveyor motor has repeated failures. After repairs the motor runs normally for a few months till it again suffers a burn out. It is a totally enclosed fan cooled motor and every time it fails it is observed that the outer fins have a thick and hard deposit of ore dust.
a closed tank having a volume of 2ft3 is filled with 0.30 lb of a gas. a pressure gage attached to the tank reads 12
a 1 m3 rigid tank contains a two-phase mixture of saturated liquid water and saturated water vapor at atmospheric
derive the scaling relation for the strain energy release rate of crack extension under fixed displacement. clearly
a wind turbine of the 3-bladed propeller type having 50 efficiency generates 2 mwe when the wind speed is 14 ms. the
an insulated cylinder is initially filled with saturated r-134a vapor at a specified pressure. thenbsprefrigerant
on the basis of the information given ,is it possiple to compute the magnitude of the load that is necessary to produce this change in length?
A 0.453-Kg mass attached to a light spring elongates it by 7.87mm. Determine the natural frequency of the system.
How many engagement points on the flywheel would be necessary to make this machine safe? Show your work.
100 kg of liquid water at 25C and 50 kg of ice at 0C are placed in an isolated container. (a) (b) (c) Find the initial volume of the liquid-ice mixture, in m3. Determine the volume after all the ice is melted, in m3. Will the temperature of the li..
determine the specific volume for the following saturated water a 15 psi x0.5 b 90 psi x0.4 c 145 psi x0.3 d 650 psi
a spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 w. if the probe surface
a 180-lb man and a 120-lb woman stand side by side at the same end of a 300-lb boat ready to dive each with a 16-fts
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