88001. Which of the following governor is used to drive a gramophone?
88002. In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to
88003. The ball and socket joint is an example of screw pair.
88004. A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
88005. The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is
88006. ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is
88007. A rotary internal combustion engine has __________ cylinders.
88008. The power transmitted by a belt is maximum when the maximum tension in the belt is __________ of centrifugal tension.
88009. The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
88010. A torsional system with discs of moment of inertia I1 and I2 as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to
88011. A spring controlled governor is said to be isochronous when the controlling force
88012. 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
88013. 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.
88014. The critical speed of a shaft depends upon its
88015. Which of the following mechanism is an approximate straight line motion mechanism?
88016. A shaft carrying two rotors at its ends will have
88017. When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
88018. The friction experienced by a body, when at rest, is known as static friction.
88019. When the particles of a body moves perpendicular to its axis, then the body is said to have
88020. A sliding pair has a completely constrained motion.
88021. Power of a governor is the
88022. The power from the engine to the rear axle of an automobile is transmitted by means of
88023. A flywheel is used to control the mean speed of an engine caused by the variations in load.
88024. A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
88025. The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball, and M = Mass on the sleeve)
88026. In a reciprocating steam engine, which of the following forms a kinematic link?
88027. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is
88028. When the tip of a tooth undercuts the root on its mating gear, it is known as interference.
88029. Under logarithmic decrement, the amplitude of successive vibrations are
88030. The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)
88031. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
88032. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then
88033. When the connection between the elements forming a pair is such that the constrained motion is not completed by itself, but by some other means, the motion is said to be a completely constrained motion,
88034. In gears, interference takes place when
88035. The ratio of maximum fluctuation of speed to the mean speed is called
88036. Which of the following statement is correct for involute gears?
88037. The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.
88038. At the node, the shaft remains unaffected by the vibration.
88039. 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)
88040. When the two elements of a pair have __________ when in motion, it is said to a lower pair.
88041. The sensitiveness of a governor depends upon the lift of the sleeve.
88042. The ratio of maximum fluctuation of energy to the workdone per cycle is called
88043. 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
88044. The centre of suspension and centre of percussion are not interchangeable.
88045. The size of cam depends upon
88046. The acceleration of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
88047. The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
88048. The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at
88049. The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
88050. A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction.
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