87801. The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l1 and l2 = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)
87802. A Porter governor is a
87803. The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank)
87804. A type-writer constitutes a machine.
87805. Due to slip of belt, the velocity ratio of the belt drive increases.
87806. In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
87807. A body in motion will be subjected to coriolis acceleration when that body is
87808. The rolling of a complete ship side-ways is known as pitching of a ship.
87809. The frictional torque transmitted by a disc or plate clutch is same as that of
87810. The frictional torque transmitted by a cone clutch is same as that of
87811. When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as helical gearing.
87812. When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
87813. The centrifugal tension in belts
87814. In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
87815. In vibration isolation system, if ω/ωn > 2 , then for all values of damping factor, the trans-missibility (i.e. the ratio of the force transmitted to the force applied) will be less than unity.
87816. The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
87817. For the brake to be self locking, the force P at C shown in the below figure, should
87818. In a four bar chain or quadric cycle chain
87819. A single degree of freedom system is given by , with usual notations. It represents
87820. In a Hartnell governor, the lift of the sleeve is given by (where r1 and r2 = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)
87821. When a mechanism is required to transmit power or to do some particular type of work, then it becomes a machine.
87822. The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is
87823. Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
87824. The ratio of driving tensions for rope drive is same as that of V-belt drive.
87825. A Hartnell governor is a
87826. Frequency of vibrations is usually expressed in
87827. The relation between number of pairs (p) forming a kinematic chain and the number of links (l) is
87828. The cam follower generally used in air-craft engines is
87829. In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
87830. If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
87831. The factional torque for square thread at the mean radius r while raising load W is given by
87832. A system in dynamic balance implies that
87833. The example of completely constrained motion is a
87834. In involute gears, the pressure angle is
87835. A shaft carrying three rotors will have
87836. In a mechanism, the fixed instantaneous centres are those centres which
87837. Which of the following statements regarding laws governing the friction between dry surfaces are correct?
87838. The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is
87839. A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a
87840. A link or element need not to be a rigid body, but it must be a resistant body.
87841. Which of the following statement is correct for gears ?
87842. In a screw jack, the effort required to lift the load W is given by (where α = Helix angle, and φ = Angle of friction)
87843. In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at
87844. The coriolis component of acceleration leads the sliding velocity by
87845. The length of a simple pendulum which gives the same frequency as the compound pendulum, is
87846. Which of the following is a spring controlled governor?
87847. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail.
87848. At the nodal point in a shaft, the amplitude for torsional vibration will be
87849. When a body is subjected to transverse vibrations, the stress induced in a body will be
87850. The magnitude of linear velocity of a point B on a link AB relative to point A is (where ω = Angular velocity of the link AB)
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