mechanical-engineering-theory-of-machines Related Question Answers

101. The lead screw of a lathe with nut forms a





102. In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to




103. The angle of the inclined plane at which the body just begins to slide down the plane, is called helix angle.



104. In forced vibrations, the magnitude of damping force at resonance is equal to the impressed force.



105. When a slider moves on a fixed link having curved surface, their instantaneous centre lies





106. Scotch yoke mechanism is used to generate





107. The unbalanced primary forces in a reciprocating engine are





108. The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in





109. The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.




110. The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.



111. In the two rotor system as shown in the below figure (I1 < I2), a node of vibration is situated





112. For static balancing of a shaft, the net dynamic force acting on the shaft is equal to zero.



113. A spring controlled governor is said to be unstable, if the relation between the controlling force (Fc) and radius of rotation (r) is Fc = ar.



114. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be





115. Most of the engines, generally, do not require balancing of secondary forces and couples.



116. The secondary unbalanced force is maximum __________ in one revolution of the crank.





117. A spring controlled governor is found unstable. It can be made stable by





118. In order to have a good grip on the pulley, the V-belt should touch the bottom of the groove in the pulley.



119. In order to double the period of a simple pendulum, the length of the string should be





120. When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as




121. Longitudinal vibrations are said to occur when the particles of a body moves





122. The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)





123. The sensitiveness of the governor __________ as the speed range decreases.




124. In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from





125. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)


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