87751. The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in
87752. The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.
87753. The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.
87754. In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated
87755. For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.
87756. 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.
87757. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
87758. Most of the engines, generally, do not require balancing of secondary forces and couples.
87759. The secondary unbalanced force is maximum __________ in one revolution of the crank.
87760. A spring controlled governor is found unstable. It can be made stable by
87761. In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley.
87762. In order to double the period of a simple pendulum, the length of the string should be
87763. 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
87764. Longitudinal vibrations are said to occur when the particles of a body moves
87765. 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)
87766. The sensitiveness of the governor __________ as the speed range decreases.
87767. In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
87768. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
87769. If the damping factor for a vibrating system is unity, then the system will be
87770. In vibration isolation system, if ω/ωn < 2 , then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)
87771. When a point at the end of a link moves with constant angular velocity, its acceleration will have
87772. The time taken by a particle for one complete oscillationis known as periodic time.
87773. 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
87774. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.
87775. A governor is said to be stable, if the
87776. In a Proell governor, the balls are attached to the extension of lower links.
87777. A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The radial component of the acceleration of B with respect to A, is (where vBA = Linear velocity of B with respect to A)
87778. Critical damping is a function of
87779. The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l - 2. If the left hand side of this equation is greater than the right hand side, then the chain is
87780. A Porter governor can not be isochronous.
87781. The example of successfully constrained motion is a
87782. Which one of the following can completely balance several masses revolving in different planes on a shaft?
87783. 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
87784. 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.
87785. Creep in belt drive is due to
87786. A watt's governor can work satisfactorily at speeds from
87787. The displacement of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r1 = Minimum radius of the cam, and θ = Angle turned through by the cam)
87788. In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other.
87789. An exact straight line motion mechanism is a
87790. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)
87791. When the sleeve of a Porter governor moves downwards, the governor speed
87792. When one of the links of a kinematic chain is fixed, the chain is known as a
87793. The natural frequency of free transverse vibrations of a shaft fixed at both ends and carrying a uniformly distributed load is 0.571/δS , where δS is the static deflection of a shaft fixed at both ends and carrying a uniformly distributed load.
87794. 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
87795. In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
87796. The controlling force diagram for a spring controlled governor is a curve passing through the origin.
87797. The lower pairs are __________ pairs.
87798. The arrangement is called bevel gearing, when two __________ are connected by gears.
87799. The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
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