A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is 5,367 r.p.m. 6,000 r.p.m. 9,360 r.p.m. 12,000 r.p.m. TRUE ANSWER : ? YOUR ANSWER : ?
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone) (1/2) μ W R cosecα (2/3) μ W R cosecα μ W R cosecα (3/4) μ W R cosecα TRUE ANSWER : ? YOUR ANSWER : ?
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a Screw pair Spherical pair Turning pair Sliding pair TRUE ANSWER : ? YOUR ANSWER : ?
The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is Perpendicular to PO At 45° to PO Along PO None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Rectangular bar in a rectangular hole is the following type of pair Completely constrained motion Partially constrained motion Freely constrained motion Incompletely constrained motion TRUE ANSWER : ? YOUR ANSWER : ?
The ratio of maximum fluctuation of energy to the work-done per cycle is called None of these Coefficient of fluctuation of energy Fluctuation of energy Maximum fluctuation of energy TRUE ANSWER : ? YOUR ANSWER : ?
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line At 45° to line as per (A) Joining the corresponding points Perpendicular to line as per (A) Not possible to determine with these data TRUE ANSWER : ? YOUR ANSWER : ?
The Ackermann steering mechanism is preferred to the Davis type in automobiles because The former is having turning pair The former is most economical The former is most rigid The former is mathematically accurate TRUE ANSWER : ? YOUR ANSWER : ?
The advantage of the piston valve over the slide valve is that in the former case Wear is less The pressure developed being high provides tight sealing Power absorbed is less Both wear and power absorbed are low TRUE ANSWER : ? YOUR ANSWER : ?
The example of spherical pair is Ball bearing and roller bearing Ball and socket joint Bolt and nut Lead screw of a lathe TRUE ANSWER : ? YOUR ANSWER : ?