Theory of Machine The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction) α = 45° + φ/2 α = 45° - φ/2 α = 90° - φ α = 90° + φ α = 45° + φ/2 α = 45° - φ/2 α = 90° - φ α = 90° + φ ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In a pantograph, all the pairs are Turning pairs Spherical pairs Self-closed pairs Sliding pairs Turning pairs Spherical pairs Self-closed pairs Sliding pairs ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents Forced vibration with damping Forced vibration without damping Free vibration without damping Free vibration with damping Forced vibration with damping Forced vibration without damping Free vibration without damping Free vibration with damping ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine In an ideal machine, the output as compared to input is Equal More May be less or more depending on efficiency Less Equal More May be less or more depending on efficiency Less ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine Coriolis component is encountered in Slider crank mechanism Four bar chain mechanism Quick return mechanism of shaper Both (A) and (C) above Slider crank mechanism Four bar chain mechanism Quick return mechanism of shaper Both (A) and (C) above ANSWER DOWNLOAD EXAMIANS APP
Theory of Machine The two elements of a pair are said to form a higher pair, when they Permit relative motion Are kept in contact by the action of external forces, when in motion Have a line or point contact when in motion Have a surface contact when in motion Permit relative motion Are kept in contact by the action of external forces, when in motion Have a line or point contact when in motion Have a surface contact when in motion ANSWER DOWNLOAD EXAMIANS APP
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