Mechanical Engineering Answers

State different types of damping a vibration system

Calculate the maximum value of the e.m.f. generated in a coil which is rotating at 50 rev/s in a uniform
magnetic field of 0.8 Wb/m3
. The coil is wound on a square former having sides 5 cm in length and is wound
with 300 turns.

A single stage reciprocating compressor takes 1 m3 of air per minutes at 1.013 bar and 15 C and delivers it at 7 bar. Assuming that the law of compression is pV1.35=constant, and that clearance is negligible. Calculate the indicated power (kW)

The vertices of a triangle are situated at points (15, 30), (25, 35) and (5, 45). Find the coordinates of the vertices if the triangle is first rotated 100 counter clockwise direction about the origin and then scaled to twice its size.

A piston-cylinder device fitted with stops as shown in the figure initially contains one kg of water at 400 kPa and 300°C. Heat is rejected from the cylinder at constant pressure until water exists in the cylinder as a saturated vapour and the piston rests on the stops. Heat rejection from the cylinder continues until the pressure is 100 kPa. Calculate the heat transfer from the system.

list the various factors affecting the operation of power plant

the clutch plate hold in between ------------- and pressure guage

Find the angle of inclination with respect to vertical of a two wheeler negotiating a turn. Combined mass of the vehicle with its rider is 250 kg.
Moment of inertia of the engine flywheel – 0.3 kg m2
Moment of inertia of each road wheel – 1 kg m2

Speed of the flywheel is 5 times the speed of the road wheel and in the same direction. Height of the centre of gravity of the rider with vehicle is 0.6 m. Speed of the two wheeler is 90 KMPH. Wheel radius is 300 mm. Radius of turn is 50 meters.

Design a bushed pin type flexible coupling to connect a motor shaft to a pump shaft transmitting 200 KW power at 1440 rpm. The allowable shear and crushing stress from steel shafts. Keys and pins are 40 Mpa and 80 MPa respectively. The allowable shear iron flange is 10 MPa and the allowable bearing pressure for rubber bush is 0.5 Mpa.

Find the maximum diameter of hole that can be punch in a M.S plate 10 mm thick having ultimate shear of 200 N/mm2. The allowable crushing stress in punch material is 350 N/mm2.