87951. A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2 L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
87952. If the pressure angle is __________ , a reciprocating follower will jam in its bearings.
87953. The D-slide valve is also known as
87954. When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a
87955. The magnitude of velocities of the points on a rigid link is
87956. A pendulum type governor is a Watt governor.
87957. In a single slider crank chain
87958. The mechanism consisting of three turning pairs and one sliding pair, is called a
87959. A system of masses rotating in different parallel planes is in dynamic balance if the
87960. The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
87961. A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
87962. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure, is
87963. The axis of precession is __________ to the plane in which the axis of spin is going to rotate.
87964. Bifilar suspension method is used to find the
87965. The equation of motion for a vibrating system with viscous damping is If the roots of this equation are real, then the system will be
87966. The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as
87967. The motion of a shaft in a circular hole is an example of
87968. A spring controlled governor is said to be unstable when the controlling force
87969. The equivalent length of a simple pendulum depends upon the distance between the point of suspension and the centre of gravity.
87970. Balancing of rotating and reciprocating parts of an engine is necessary when it runs at
87971. When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
87972. In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as
87973. When no external force acts on a body, after giving it an initial displacement, the body is said to have free vibrations.
87974. Which of the following is an example of sliding pair?
87975. The coriolis component of acceleration exists whenever apoint moves along a path that has
87976. In a steam engine, the distance by which the inner edge of the D-slide valve overlaps the steam port is called lead.
87977. A shaft of mass (mc)and stiffness (s) is fixed at one end and carries a mass (m) at the other end. The natural frequency of its transverse vibration is same as for longitudinal vibration.
87978. The distance by which the __________ of the D-slide valve overlaps the steam port is called exhaust lap.
87979. The stress induced in a body will be shear stress, when it is subjected to
87980. A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become
87981. When a body is subjected to longitudinal vibrations, the stress induced in a body will be tensile or compressive stress.
87982. If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to
87983. Effort of a governor is the
87984. The total number of instantaneous centres for a mechanism consisting of n links are
87985. The partial balancing means
87986. Which of the following statement is correct as regard to the difference between a machine and a structure?
87987. The coriolis component of acceleration depends upon
87988. A mechanism __________ for transmitting or transforming motion.
87989. The distance moved by the valve from one end to the other end is called valve travel.
87990. The Klein's method of construction for reciprocating engine mechanism
87991. A Watt's governor is a spring loaded governor.
87992. The velocity of the rubbing surface __________ with the distance from the axis of the bearing.
87993. The brake commonly used in railway trains is
87994. A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
87995. The acceleration of the particle moving with simple harmonic motion is __________ at the mean position.
87996. In a differential band brake as shown in the below figure, if the length OB is greater than OA, then the force P at C should act in the downward direction.
87997. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
87998. The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to
87999. A point on a connecting link (excluding end points) of a double slider crank mechanism traces a
88000. The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.
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