A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by
The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
The two links are said to have a pure rolling contact, when their instantaneous centre __________ on their point of contact.
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
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will
In order to give a complete secondary balance of a multi-cylinder in-line engine,
The maximum velocity of a particle moving with simple harmonic motion is
A mechanism is an assemblage of
Which of the following statement is correct for involute gears?
When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
The friction experienced by a body, when at rest, is known as static friction.
Which of the following statement is wrong?
Efficiency of a screw jack is given by
The centre of suspension and centre of percussion are not interchangeable.
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
In a simple harmonic motion, the velocity vector with respect to displacement vector
The coefficient of fluctuation of speed is __________ of maximum fluctuation of speed and the mean speed.
The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where β = Semi-angle of the groove)
The power transmitted by a belt is maximum when the maximum tension in the belt is __________ of centrifugal tension.
The frequency of oscillation of a torsional pendulum is
The size of cam depends upon
The brake commonly used in motor cars is internal expanding brake.
A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis
When a point moves along a straight line, its acceleration will have
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if
The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are complex conjugate, then the system will be critically damped.
The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.
The primary unbalanced force of reciprocating masses is inversely proportional to the crank radius.
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.
When the particles of a body moves perpendicular to its axis, then the body is said to have
The dedendum circle diameter is equal to (where φ = Pressure angle)
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.
A sliding pair has a completely constrained motion.
Power of a governor is the
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
The power from the engine to the rear axle of an automobile is transmitted by means of
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to
At the node, the shaft remains unaffected by the vibration.
A flywheel is used to control the mean speed of an engine caused by the variations in load.
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a
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 anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
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