Mechanical Engineering MCQs

The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

by
✅ The correct answer is option D.

Two heavy rotating masses are connected by shafts of lengths l1, l2 and l3 and the corresponding diameters are d1, d2 and d3. This system is reduced to a torsionally equivalent system having uniform diameter d = d1 of the shaft. The equivalent length of the shaft is

by
l1 + l2 + l3
✅ The correct answer is option C.

A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

by
The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction.
The upper and bottom rolls rotate in the same direction whereas the middle roll rotate in opposite direction.
The bottom and middle roll rotate in the same direction.
any one of the above
✅ The correct answer is option B.