87901. For the isochronous Porter governor, the controlling force curve is a straight line passing through the origin.
87902. The virtual or equivalent eccentric for the Meyer's expansion valve is defined as an eccentric having such a length and angle of advance that will cause cut-off to take place at the same position, as is caused by the combined effect of main eccentric and expansion eccentric.
87903. The uniform pressure theory gives a higher frictional torque than the uniform wear theory.
87904. The centrifugal tension on the belt has no effect on the power transmitted.
87905. The train value of a gear train is
87906. The driving and driven shafts connected by a Hooke's joint will have equal speeds, if
87907. The coriolis component of acceleration is taken into account for
87908. The flank of the tooth is the surface of the tooth __________ the pitch surface.
87909. The frictional torque transmitted in a flat collar bearing, considering uniform wear, is (where r1 and r2 = External and internal radii of collar respectively)
87910. The inertia force is equal to the accelerating force in magnitude, but opposite in direction.
87911. A slider moving on a fixed link having constant radius of curvature will have its instantaneous centre at the centre of the circle.
87912. According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a
87913. The tangential component of acceleration of the slider with respect to the coincident point on the link is called coriolis component of acceleration.
87914. The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
87915. When two links are connected by a pin joint, their instantaneous centre lies
87916. The direction of linear velocity of any point on a link with respect to another point on the same link is
87917. In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should
87918. The periodic time of a compound pendulum is __________ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.
87919. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
87920. The unbalanced force due to reciprocating masses
87921. The relation l = (j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
87922. The motion between a pair which takes place in __________ is known as incompletely constrained motion.
87923. The equation of free vibrations of a system is , Its natural frequency is
87924. When the primary direct crank of a reciprocating engine makes an angle of θ with the line of stroke, then the secondary direct crank will make an angle of __________ with the line of stroke.
87925. The relation between number of links (l) and number of joints (j) in a kinematic chain is
87926. Two heavy rotating masses are connected by shafts of lengths l1, l2 and l3 and the corresponding diameters are d1, d2 and d3. This system is reduced to a torsionally equivalent system having uniform diameter d = d1 of the shaft. The equivalent length of the shaft is
87927. In a simple train of wheels, if the number of intermediate wheels is odd, the motion of the follower will be same as that of the driver.
87928. Which of the following is a pendulum type governor?
87929. The angle of inclination of the plane, at which the body begins to move down the plane is called
87930. The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
87931. The centre of gravity of a coupler link in a four bar mechanism will experience
87932. The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
87933. In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
87934. A kinematic chain is known as a mechanism when
87935. When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.
87936. There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
87937. The Klein's diagram is used when
87938. An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
87939. A mechanism consisting of more than four links is called a compound mechanism.
87940. The natural frequency of free transverse vibrations is same as that of free longitudinal vibrations.
87941. The throw of the eccentric is equal to the valve travel.
87942. The addendum is the radial distance of tooth from the pitch circle to the top of the tooth.
87943. A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)
87944. The height of a Watt's governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)
87945. V-belts are usually used for
87946. Sensitiveness of the governor is defined as the ratio of the
87947. The two parallel and coplaner shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
87948. The relative velocity of B with respect to A in a rigid link AB is
87949. In a pantograph, all the pairs are
87950. The velocity of a body moving with simple harmonic motion is __________ at the mean position.
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