For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle) 4μ sinθ/(θ + sinθ) 4μ sinθ/(2θ + sin 2θ) μ sinθ/(2θ + sin 2θ) 2μ sinθ/(θ + sinθ) TRUE ANSWER : ? YOUR ANSWER : ?
The velocity of sliding __________ the distance of the point of contact from the pitch point. Is inversely proportional to Is directly proportional to Does not depend upon Is equal to cos φ multiplied by TRUE ANSWER : ? YOUR ANSWER : ?
The resultant axial load on a bolt depends upon External load applied All of these Initial tension due to tightening of the bolt Relative elastic yielding of the bolt and the connected members TRUE ANSWER : ? YOUR ANSWER : ?
Castle nut is a locking device in which One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip A slot is cut partly is middle of nut and then slot reduced by tightening a screw TRUE ANSWER : ? YOUR ANSWER : ?
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to pd/σt pd/3σt pd/2σt pd/4σt TRUE ANSWER : ? YOUR ANSWER : ?
The included angle in unified of American National threads is 29° 60° 55° 47° TRUE ANSWER : ? YOUR ANSWER : ?
The value of Lewis form factor used in design of gears is Independent of size of teeth Dependent on number of teeth of a gear All of these Dependent on system of teeth TRUE ANSWER : ? YOUR ANSWER : ?
In a hydrodynamic lubricated bearing There is no lubricant between the journal and the bearing There is a thick film of lubricant between the journal and the bearing The lubricant is forced between the journal and the bearing, by external pressure There is a thin film of lubricant between the journal and the bearing TRUE ANSWER : ? YOUR ANSWER : ?
A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is Less than 1/10 Greater than 1/10 None of these Equal to 1/10 TRUE ANSWER : ? YOUR ANSWER : ?
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis. Four times Three times Twice Equal to TRUE ANSWER : ? YOUR ANSWER : ?