Theory of machines Questions

• In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
• When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
• In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
• For high speed engines, the cam follower should move with
• The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.
• For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a
• The steering of a ship means
• The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
• When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.
• The partial balancing of reciprocating parts in locomotives produces
• The cam follower generally used in automobile engines is
• The gears are termed as medium velocity gears, if their peripheral velocity is
• The Whitworth quick return motion mechanism is formed in a slider crank chain when the
• The factor which affects the critical speed of a shaft is
• In a coupling rod of a locomotive, each of the four pairs is a __________ pair.
• When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
• If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the
• The gear train usually employed in clocks is a
• When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
• The static friction