8.SSC JE (ME)II Machine Design Booster Quiz-2

A spring of stiffness 3kNm is initially stretched by 5cm. Later on the spring is further stretched by 10cm. What is the work done in stretching?

For Power transmission purpose, which of the following screw thread is adopted in either direction?

If T₁ & T₂are the tight side and slack side tensions of the belt respectively, then the initial tension in the belt is equal to

A solid cast iron disk of mass 1000kg is rotating at 350 rpm. Diameter of the disk is 1m and time taken to come to stop the disk by brake is 1.6 sec. Calculate energy absorbed by the brake if square of radius of gyration is 0.2.

In a multiple disc clutch there are 8 discs on the driving shaft, and 7 discs on the driven shaft. Calculate the no. of pairs of contact surfaces____.

In the expression of dynamic load capacity P=XVF_r + YF_a, V stands for ?

Calculate the bearing life , if rating life for  bearings is 9000h and shaft is rotating at 1500rpm.

In which of the following case stress concentration factor is ignored?