Mechanical Engineering Answers

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 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.

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.

A machine f mass 1000 kg is supported on springs which deflect 8 mm under static load with negligible damping of the machine vibrates with an amplitude of 5 mm when subjected to a vertical harmonic force at 80 percent of the resonant frequency. When the damper is fitted it is found that the resonant amplitude is 2 mm. Find ( I ) Amplitude of the damping force and ( ii ) damping co-efficient

A mass of 1 kg is attached to a spring having a stiffness of 3920 N/m. The mass slides on a horizontal surface, the co-efficient of friction between mass and surface being 0.1. Determine the frequency of vibration of the system and amplitude after one cycle if the initial amplitude is 0.25 cm.

A torsional pendulum when immersed in oil indicates its natural frequency of 200 Hz. But when it was put to vibration in vacuum having no damping, its natural frequency has observed as 250 Hz. Find the value of damping factor of the oil.

A Four cylinder vertical engine has cranks 300 cm long. The planes of rotation of the first, third and fourth cranks are 750 mm, 1050 mm and 1650 mm respectively from that of the second crank and their reciprocating masses are 150 kg, 400 kg and 250 kg respectively. Find the mass of the reciprocating parts for the second cylinder and relative angular position of the cranks in order that the engine may be in complete primary balance.

Four masses are attached to a shaft at planes A,B,C and D at equal radii. The distance of the planes B,C and D from A are 40 cm, 50 cm and 120 cm respectively. The masses at A,B and C are 60 kg, 45 kg and 70 kg respectively. If the system is in complete balance, determine the mass at Dand position of masses B,C and D with respect to A.