Mechanical Engineering Answers

Find the maximum diameter of hole that can be punch in a M.S. plate 10mm thick
having ultimate shear stress of 220 N/mm2. The allowable crushing stress in punch
material is 350 N/mm2.

A leather belt transmits 10 kW from a motor running at 600 rpm by an open-belt drive. The diameter of the driving pulley of the motor is 350 mm, centre distance between the pulleys 4 m and speed of the driven pulley 180 rpm. The belt weighs 1100 kg/m3 and the maximum allowable tension in the belt is 2.5 N/mm2. μ = 0.25. Find the width of the belt assuming the thickness to be 10 mm. Neglect the belt thickness to calculate the velocities

A double pipe heat exchanger has an effectiveness of 0.5 when the flow is
counter- current and the thermal capacity of one fluid is twice that of the
other fluid. Calculate the effectiveness of the heat exchanger if the direction
of flow of one of the fluids is reversed with the same mass flow rates as
before?

Air is compresses in a two-stage vane-type compressor from 1.013 bar to.
8.75 bar Using the data below, and assuming equal pressure ratios in each
stage, that compression is complete in each stage that the machine
operates in an ideal manner and is uncooled apart from the intercooler,
calculate:
(i) the power required.
(ii) The volume flow rate measured at the delivery pressure.

The temperature in a vessel is 36 degree C and the proportion by mass of
air to dry saturated steam is 0.1. What is the pressure in the vessel in bar
and in mm of mercury vacuum? The barometric pressure is 760mm Hg?

The temperature in a vessel is 36 degree C and the proportion by mass of
air to dry saturated steam is 0.1. What is the pressure in the vessel in bar
and in mm of mercury vacuum? The barometric pressure is 760mm Hg?

In an air compressor the pressures at inlet and outlet are 1bar and 5bar respectively. The temperature of the air at inlet is 15 degree C and the volume at the beginning of compression is three times that at the end of compression. Calculate the temperature of the air at outlet and the increase of internal energy per kg of air.

Q1
Analyse the suitability of the technology of Allen Bradley in industrial PLC systems.
Q2
Analyse the suitability of the technology of siemens in industrial PLC systems.
Q3
Evaluate, the suitability of the technology of Allen Bradley in industrial PLC systems, suggesting possible improvements.
Q4
Evaluate, the suitability of the technology of Siemens in industrial PLC systems, suggesting possible improvements.

Describe an experimental procedure that the student could use to measure the force F that the air experts on the fan-block system when the fan is turned on. Assume that the magnitude of this force is the same for l angles 0

A four-Cylinder, four-stroke diesel engine develops 83.5 kW at 1800 rev/min ands a specific fuel consumption of 0.231 141W h, and air-fuel ratio of 23/1. The analysis of the fuel is 87% carbon and 13% hydrogen. and the is 43 500 kl/kg. The jacket cooling water flows at 0.246 kegs and its temperature rise is 50 K. The exhaust temperature is 316'C. Draw up an energy balance for the engine. Take R sa0.302 klike K and e, = 1.09 kl/kg K for the dry exhaust gas, and c, - 126 kJ/kg K for superheated steam. The temperature in the tat house is 17.8° C. and the exhaust gas pressure is 1.013 bar