Theory of machines Online Test – Multiple Choice Questions and Answers 1. A shaft carrying three rotors will have no node one node two node three node 2. In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done in order to have acceleration in beginning and retardation at the end of stroke within the finite limits because of difficulty in manufacturing cam profile because of loose contact of follower with cam surface because the uniform velocity motion is a partial parabolic motion 3. A governor is said to be stable, if the radius of rotation of balls increases as the equilibrium speed decreases radius of rotation of balls decreases as the equilibrium speed decreases radius of rotation of balls increases as the equilibrium speed increases radius of rotation of balls decreases as the equilibrium speed increases 4. Which of the following statements regarding laws governing the friction between dry surfaces are correct? The friction force is directly proportional to the normal force The friction force is independent of me area of contact The friction force is dependent on the materials of the contact surfaces all of the above 5. For low and moderate speed engines, the cam follower should move with cycloidal motion simple harmonic motion uniform velocity uniform acceleration and retardation 6. A Hartnell governor is a pendulum type governor dead weight governor spring loaded governor inertia governor 7. Which of the following statement is correct? The wear of the piston valve is less than the wear of the D-slide valve The D-slide valve is also called outside admission valve The power absorbed in operating the piston valve is less than D-slide valve all of the above 8. A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a mechanism kinematic chain structure inversion 9. In involute gears, the pressure angle is dependent on the size of teeth dependent on the size of gears always variable always constant 10. Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment? D-slide valve Flywheel Governor Meyer’s expansion valve Loading … Question 1 of 10
