Machine Design Which of the following statement is correct regarding power screws? Both (A) and (B) The efficiency of a self locking screw can not be more than 50% The efficiency of Acme (trapezoidal) thread is less than that of a square thread If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% Both (A) and (B) The efficiency of a self locking screw can not be more than 50% The efficiency of Acme (trapezoidal) thread is less than that of a square thread If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% ANSWER DOWNLOAD EXAMIANS APP
Machine Design If the centre distance of the mating gears having involute teeth is increased, then the pressure angle Increases Remains unchanged None of these Decreases Increases Remains unchanged None of these Decreases ANSWER DOWNLOAD EXAMIANS APP
Machine Design In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks) T₁/T₂ = (μθ)n T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n T₁/T₂ = μθ × n T₁/T₂ = (μθ)n T₁/T₂ = [(1 - μ tanθ)/ (1 + μ tanθ)]n T₁/T₂ = [(1 + μ tanθ)/ (1 - μ tanθ)]n T₁/T₂ = μθ × n ANSWER DOWNLOAD EXAMIANS APP
Machine Design The strength of a riveted joint is equal to Least value of Pt Ps and Pc Crushing strength of rivet (Pc) Tearing strength of plate (Pt) Shearing strength of rivet (Ps) Least value of Pt Ps and Pc Crushing strength of rivet (Pc) Tearing strength of plate (Pt) Shearing strength of rivet (Ps) ANSWER DOWNLOAD EXAMIANS APP
Machine Design The width of the pulley should be __________ width of the belt. Greater than Less than Equal to None of these Greater than Less than Equal to None of these ANSWER DOWNLOAD EXAMIANS APP
Machine Design A key capable of tilting in a recess milled out in a shaft is known as Woodruff key Hollow saddle key Feather key Flat saddle key Woodruff key Hollow saddle key Feather key Flat saddle key ANSWER DOWNLOAD EXAMIANS APP
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