Machine Design Which of the following statement is correct regarding power screws? The efficiency of Acme (trapezoidal) thread is less than that of a square thread The efficiency of a self locking screw can not be more than 50% Both (A) and (B) If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50% The efficiency of Acme (trapezoidal) thread is less than that of a square thread The efficiency of a self locking screw can not be more than 50% Both (A) and (B) 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 Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material) (p - d) t.σt p.t.σt p.d.σt (p - d) t.σt p.t.σt p.d.σt ANSWER DOWNLOAD EXAMIANS APP
Machine Design The standard length of the shaft is 7 m 6 m All of these 5 m 7 m 6 m All of these 5 m ANSWER DOWNLOAD EXAMIANS APP
Machine Design The load cup of a screw jack is made separate from the head of the spindle to Prevent the rotation of load being lifted Reduce the value of frictional torque Enhance the load carrying capacity of the jack Reduce the effort needed for lifting the working load Prevent the rotation of load being lifted Reduce the value of frictional torque Enhance the load carrying capacity of the jack Reduce the effort needed for lifting the working load ANSWER DOWNLOAD EXAMIANS APP
Machine Design The backlash for spur gears depends upon Pitch line velocity Tooth profile Module Both module and pitch line velocity Pitch line velocity Tooth profile Module Both module and pitch line velocity ANSWER DOWNLOAD EXAMIANS APP
Machine Design Shaft coupling is used in machinery to Introduce mechanical flexibility Reduce the transmission of shock loads All of these Introduce protection against over loads Introduce mechanical flexibility Reduce the transmission of shock loads All of these Introduce protection against over loads ANSWER DOWNLOAD EXAMIANS APP
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