Theory of Machine A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is 9,360 r.p.m. 5,367 r.p.m. 12,000 r.p.m. 6,000 r.p.m. 9,360 r.p.m. 5,367 r.p.m. 12,000 r.p.m. 6,000 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine For the same lift and same angle of ascent, a smaller base circle will give Something else A large value of pressure angle There is no such relation with pressure angle A small value of pressure angle Something else A large value of pressure angle There is no such relation with pressure angle A small value of pressure angle ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Inertia force acts Along the direction of acceleration force None of the listed here Perpendicular to the acceleration force Opposite to the direction of acceleration force Along the direction of acceleration force None of the listed here Perpendicular to the acceleration force Opposite to the direction of acceleration force ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship. Vertically and parallel Horizontally and parallel Horizontally and perpendicular Vertically and perpendicular Vertically and parallel Horizontally and parallel Horizontally and perpendicular Vertically and perpendicular ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In a reciprocating engine, usually __________ of the reciprocating masses are balanced. One-half Whole Two-third Three-fourth One-half Whole Two-third Three-fourth ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine 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 length of connecting rod to radius of crank) m.ω².r cosθ m.ω².r (cos 2θ/n) m.ω².r (sin 2θ/n) m.ω².r sinθ m.ω².r cosθ m.ω².r (cos 2θ/n) m.ω².r (sin 2θ/n) m.ω².r sinθ ANSWER DOWNLOAD EXAMIANS APP
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