The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
When the two elements of a pair have __________ when in motion, it is said to a lower pair.
When a slider moves on a fixed link having curved surface, their instantaneous centre lies
The working depth of a gear is the radial distance from the
A system in dynamic balance implies that
The ratio of the number of teeth to the pitch circle diameter in millimetres, is called
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
Scotch yoke mechanism is used to generate
The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be
The size of a gear is usually specified by
The example of completely constrained motion is a
The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch.
Longitudinal vibrations are said to occur when the particles of a body moves
In a mechanism, the fixed instantaneous centres are those centres which
Which of the following statement is correct for gears ?
The unbalanced primary forces in a reciprocating engine are
When the axes of the first and last wheels are co-axial, then the train is known as
Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
The swaying couple is due to the
The example of successfully constrained motion is a
The danger of breakage and vibration is maximum
In involute gears, the pressure angle is
Most of the engines, generally, do not require balancing of secondary forces and couples.
The rotating shafts tend to vibrate violently at whirling speeds because
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)
Which of the following statements regarding laws governing the friction between dry surfaces are correct?
The minimum number of teeth on the pinion which will mesh with any gear without interference forfull depth involute teeth will be
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in
Which of the following statement is correct?
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done
The primary unbalanced force is more than the secondary unbalanced force.
The cam and follower is an example of
The ratio of driving tensions for rope drive is same as that of V-belt drive.
For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.
The lead screw of a lathe with nut forms a
The angle which the normal reaction makes with the resultant reaction is called angle of friction.
If the damping factor for a vibrating system is unity, then the system will be
A shaft carrying three rotors will have
The secondary unbalanced force is maximum __________ in one revolution of the crank.
Which of the following is an inversion of a double slider crank chain?
The sensitiveness of the governor __________ as the speed range decreases.
In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
The contact ratio for gears is
A Hartnell governor is a
A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.
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