Mechanical Engineering Answers

{a }Oil flows in a pipe 100 mm bore diameter with a Reynolds’ Number of 500 .what is the density {b}While solving a problem, a person ended up with the following equation at some stage
: E = 25 kJ + 7 kJ/kg, where E is the total energy and has the unit of kilojoules. Determine how to correct the error and discuss what may have caused it. .

A full journal bearing of 50mm diameter and 100mm long has a bearing pressure of 1.4N/mm2
. The
speed of the journal bearing is 900r.p.m and the ratio of journal diameter to the diametral clearance is
1000. The bearing is lubricated with oil whose absolute viscosity at the operating temperature of 75oC. Find: (a) The amount of artificial cooling required, and (b) The mass of the lubricating oil required, if the
difference between the outlet and inlet temperature of the oil is 10oC. Take specific heat of the oil as
1850J/kg/ oC.

There's total of 18 items shown on the supercheap auto catalogue on page 3.
a. what percentage of the 18 items are discounted at a 40% off or higher rate?(rounded off to 2 decimal places)
b. you have a budget of $100, you are interested in buying a tool bag, a staple gun and the highest possble quality toolPRO spanner set. how much money will you spend and how much will you have left over after purchasing these 3 items?

A centrifugal water pump operates at 30 m3/hr and at 1440 RPM.The pump operating efficiency is 65% and motor efficiency is 89%.The discharge pressure gauge shows 3.4 kg/cm2.The suction is 3mtr below the pump centreline.If the speed of the pump is reduced by 25%, estimate pump flow, head and motor power.Assume motor and pump efficiency remains same at the reduced speed.

A pipe contains a gradually tapering section in which its diameter decreases from 400 mm to 250 mm. The pipe contains an incompressible fluid of density 1000 kgm−3 and runs full. If the flow velocity is 2 ms−1 in the smaller diameter, determine the velocity in the larger diameter, the volume flow rate and the mass flow rate.

A company is planning to buy a robotic system for its manufacturing plant. Prepare the checklist for evaluation of the robots suitable for that company.

in the analysis of unsteady flow, processes, the system is abandoned in favour of a control volume. attention is given to a fixed region in space, not to a fixed mass in motion. the control volume, defined by an imaginary closed boundary, is set up to surround the equipment under study. both mass and energy may cross the boundary. what is the difference between Upright Cylindrical Vessel and Spherical Vessel?

Mechanical implications of faraday's law include motors and generators. Briefly explain Newton's law, the basis of mechanical engineering.

Find the governing equations for the temperatures in the fireplace, furnace, and room, T1, T2, and T3, respectively. Here, q1 is the heat added to the fireplace, q2 is the heat added to the furnace, Ci is the capacitance of a volume, and Ri is the thermal resistance of at a boundary. Assume that Tout, the outside temperature, is an input for to purposes of putting this into matrix input/output form. As your final answer, put the system of equations into matrix input/output form.

A pump is delivering 50m3/hr of water with a discharge pressure of 3.5kg/cm2.The water is drawn from a sump where water level is 5 meter below the pump centre line.The power drawn by the motor is 9.5kw at 90% motor efficiency.Find out the efficiency of the pump.