Theory of Machine The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction) α = 90° + φ α = 90° - φ α = 45° - φ/2 α = 45° + φ/2 α = 90° + φ α = 90° - φ α = 45° - φ/2 α = 45° + φ/2 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 sinθ m.ω².r (sin 2θ/n) m.ω².r (cos 2θ/n) m.ω².r cosθ m.ω².r sinθ m.ω².r (sin 2θ/n) m.ω².r (cos 2θ/n) ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical) cotα = c/2b tanα = c/2b cosα = c/b sinα = b/c cotα = c/2b tanα = c/2b cosα = c/b sinα = b/c ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The train value of a gear train is Reciprocal of velocity ratio of a gear train Always less than unity Equal to velocity ratio of a gear train Always greater than unity Reciprocal of velocity ratio of a gear train Always less than unity Equal to velocity ratio of a gear train Always greater than unity ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The example of completely constrained motion is a All of these Motion of a shaft with collars at each end in a circular hole Motion of a piston in the cylinder of a steam engine Motion of a square bar in a square hole All of these Motion of a shaft with collars at each end in a circular hole Motion of a piston in the cylinder of a steam engine Motion of a square bar in a square hole ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Torsional vibrations are said to occur when the particles of a body moves In a circle about its axis None of these Perpendicular to its axis Parallel to its axis In a circle about its axis None of these Perpendicular to its axis Parallel to its axis ANSWER DOWNLOAD EXAMIANS APP
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