When the nature of contact between the elements of a pair is such that it can only slide relative to the other, the pair is known as a

In a gear having involute teeth, the normal to the involute is a tangent to the

The height of a Watt's governor is

When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

The instantaneous centres which vary with the configuration of mechanism, are called

In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

A body in motion will be subjected to coriolis acceleration when that body is

When one of the links of a kinematic chain is fixed, the chain is known as a

A body in motion will be subjected to coriolis acceleration when that body is

In vibration isolation system, if ω/ω_n > 2, then for all values of damping factor, the trans-missibility (i.e. the ratio of the force transmitted to the force applied) will be less than unity.

The distance between the centre of suspension and centre of percussion is equal to the equivalent length of a simple pendulum.

The controlling force diagram for a spring controlled governor is a curve passing through the origin.

If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable.

The maximum frictional force, which comes into play, when an body just begins to slide over the surface of the other body, is known as

If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable.

A body is said to be under forced vibrations, when

When the sleeve of a Porter governor moves upwards, the governor speed

When the sleeve of a Porter governor moves upwards, the governor speed

In a force-closed pair, the two elements of a pair are not held together mechanically.

When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than

The frictional torque transmitted by a cone clutch is same as that of

The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and k_G = Radius of gyration of the body)

In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

The cam follower generally used in air-craft engines is

The rolling of a complete ship side-ways is known as pitching of a ship.

The contact ratio is the ratio of

The natural frequency of free transverse vibrations of a shaft fixed at both ends and carrying a uniformly distributed load is 0.571/δ_S , where δ_S is the static deflection of a shaft fixed at both ends and carrying a uniformly distributed load.

The maximum efficiency of a screw jack is

When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion.

The contact ratio is the ratio of

The lower pairs are __________ pairs.

The product of the diametral pitch and module is equal to one.

In a four stroke I.C. engine, the turning moment during the compression stroke is

The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)

When the nature of contact between the elements of a pair is such that it can turn or revolve about a fixed axis, the pair is known as a rolling pair.

When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as helical gearing.

The maximum efficiency of a screw jack is

A Porter governor is a

In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine.

In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as

The magnitude of linear velocity of a point B on a link AB relative to point A is (where ω = Angular velocity of the link AB)

The frictional torque transmitted by a disc or plate clutch is same as that of

When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine.

An exact straight line motion mechanism is a

When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be

The velocity of the belt for maximum power is (where m = Mass of the belt in kg per metre length)

The arrangement is called bevel gearing, when two __________ are connected by gears.

The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by