Q. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the steam lap and the angle of advance of the eccentric but keeping constant the travel and lead of the valve, This method will

View solution

Q. The centre of suspension and centre of percussion are not interchangeable.

View solution

Q. The size of cam depends upon

View solution

Q. In an open pair, the two elements of a pair

View solution

Q. The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r1 and r2 = External and internal radii of collar respectively)

View solution

Q. Efficiency of a screw jack is given by

View solution

Q. The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where β = Semi-angle of the groove)

View solution

Q. The secondary unbalanced force is __________ the primary unbalanced force.

View solution

Q. The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

View solution

Q. The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact.

View solution

Q. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

View solution

Q. The brake commonly used in motor cars is internal expanding brake.

View solution

Q. In order to give a complete secondary balance of a multi-cylinder in-line engine,

View solution

Q. A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The total acceleration of B with respect to A will be equal to

View solution

Q. A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis

View solution

Q. When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.

View solution

Q. The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are __________ then the system will be under damped.

View solution

Q. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

View solution

Q. A mechanism is an assemblage of

View solution

Q. In a simple harmonic motion, the velocity vector with respect to displacement vector

View solution