Which of the following statement is correct as regard to the difference between a machine and a structure? All of these The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only TRUE ANSWER : ? YOUR ANSWER : ?
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is Soundness would depend upon which link is kept fixed Kinematically sound Not sound Data is not sufficient to determine same TRUE ANSWER : ? YOUR ANSWER : ?
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing) ½μWR μwr ²/₃ μWR ¾μWR TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following statements regarding laws governing the friction between dry surfaces are correct? The friction force is independent of me area of contact. The friction force is directly proportional to the normal force. All of these The friction force is dependent on the materials of the contact surfaces. TRUE ANSWER : ? YOUR ANSWER : ?
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is π (r₁ - r₂) + (r₁ - r₂)²/x + 2x π (r₁ - r₂) + (r₁ + r₂)²/x + 2x π (r₁ + r₂) + (r₁ - r₂)²/x + 2x π (r₁ + r₂) + (r₁ + r₂)²/x + 2x TRUE ANSWER : ? YOUR ANSWER : ?
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve. Equal to None of these Less than Greater than TRUE ANSWER : ? YOUR ANSWER : ?
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to Reduce slip Ensure uniform loading Reduce vibration Ensure proper alignment TRUE ANSWER : ? YOUR ANSWER : ?
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O) (ω₁ + ω₂) r (ω₁ - ω₂) r (ω₁ - ω₂) 2r ω₁.ω₂.r TRUE ANSWER : ? YOUR ANSWER : ?
When a slider moves on a fixed link having curved surface, their instantaneous centre lies At the centre of curvature At the centre of circle At the pin joint On their point of contact TRUE ANSWER : ? YOUR ANSWER : ?
A watt's governor can work satisfactorily at speeds from 200 to 300 r.p.m. 100 to 200 r.p.m. 80 to 100 r.p.m. 60 to 80 r.p.m. TRUE ANSWER : ? YOUR ANSWER : ?