MECHANICAL SAMPLE QUESTIONS

questionStatement	answerA	answerB	answerC	answerD	answerE
For a thin walled tube, what is the the hoop stress? Assume p to be the internal pressure in the tube, din to be the internal diameter of tube, l to be the length of tube, t to be the thickness of tube wall.	p*din/(t)	p*din/(2*t)	p*din/(2*t^2)	None of these
If the absolute temperature of the cold reservoir is Tc and the temperature of the hot reservoir is Th, what is the Carnot efficiency?	Tc/Th	Th/Tc	1-Tc/Th	1-Th/Tc
Gear X has 40 teeth, whereas Gear Y has 10 teeth. When Gear Y turns one revolution, how many revolutions will Gear X turn?	4-Jan	4	2	2-Jan
For maximum discharge, what should be the angle of a triangular notch?	30 degrees	45 degrees	60 degrees	90 degrees	None of these
What causes rat tail in casting?	Insufficient clay in moulding sand	Excessive heat in molten metal	Excessively high temperature of molten metal	Low refractories of clay content of sand	None of these
With the help of which process is steel produced from pig iron?	Bessemer Process	Cupola Process	Both of the above	None of the above
In a wheel and axle arrangement, the axle is turned with a speed of 5 metres/second. The diameter of the axle is 2 cm, whereas that of the wheel is 10 cm. At what speed will the wheel move?	1 m/sec	25 m/sec	5 m/sec	None of these
A work of 10KJ is performed to expand air adiabatically. What is the change in its internal energy?	-16KJ	8KJ	16KJ	32KJ	None of these