For a square threaded screw (angle of friction f), the maximum efficiency of the screw jack will be :
-
Solution
Maximum efficiency of screwjack (η)
\(\eta =\frac{(1-sin\phi )}{(1+sin\phi )}\) where, φ= angle of friction
A control chart is maintained with limits ±2 standard errors for use in monitoring samples of size n= 20.Assuming the process to be in control. The likelihood of a sample mean falling outside the control limits will be________
-
Solution
Sample mean falling outside the control limits
= 1 – 0.955 = 0.045 or 4.5%
According to principle of location in jigs and fixtures.The degree of freedom to be eliminated to have a body fixed in space, will be ________
-
Solution
The degrees of freedom to be eliminated to have a body fixed in space will be 5.
A ride and face cutter 125 mm diameter has 10 teeth. If operates at a cutting speed of 14 m/min. with a table tranverse 100 mm/min. The feed per tooth of cutter in________
-
Solution
Match List-I with List-II:
List-I List-II
A.Reynolds number 1.Inertia force and elastic force
B.Froude number 2.Inertia force and surface sension force
C.Weber number 3.Inertia force and gravity force
D.Mach number 4.Inertia force and viscous force
-
Solution
Reynolds number ⇒ Inertia force and viscous force
Froude number ⇒ Inertia and gravity force
Weber number ⇒ Inertia force and surface tension force
Mach number ⇒ Inertia force and elastic force
If Pa and Pv are partial pressures of dry air and water vapour respectively, the specific humidity of air is given by :
-
Solution
Laminar developed flow at an average velocity of 5 m/s occurs in apipe of 10 cm radius. The velocity at 5 cm radius is ________
-
Solution
The speed of driving shaft of Hook’s joint of angle 19.5°is 500 rpm. The maximum speed of driving shaft is________
-
Solution
A uniformly distributed load wkN/m is acting over the entire length of a 3 m long cantilever beam. If the shear force at the mid-point of cantilever is 6 kN, the value of‘ω’ will be ________
-
Solution
A helical gear has the active face width equal to b, pitch P and helix angle a. The minimum value of b in order that contact is maintained across the entire active face of the gear will be :
-
Solution