Theory of Machines Practice Test - Set 24 - ObjectiveBooks

# Practice Test: Question Set - 24

1. The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is
(A) Fc = ar + b
(B) Fc = ar - b
(C) Fc = ar
(D) Fc = a/r + b

2. Pitch point on a cam is
(A) Any point on pitch curve
(B) The point on cam pitch curve having the maximum pressure angle
(C) Any point on pitch circle
(D) The point on cam pitch curve having the minimum pressure angle

3. The indicator using Watt mechanism is known as
(A) Thompson indicator
(B) Richard indicator
(C) Simplex indicator
(D) Thomson indicator

4. When the radius of rotation of balls __________ as the equilibrium speed increases, the governor is said to be unstable.
(A) Remains constant
(B) Decreases
(C) Increases
(D) None of these

5. If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
(A) Stable
(B) Unstable
(C) Isochronous
(D) None of these

6. When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
(A) Stable
(B) Unstable
(C) Isochronous
(D) None of these

7. For an isochronous Hartnell governor (where r₁ and r₂ = Maximum and minimum radius of rotation of balls respectively, S₁ and S₂ = Maximum and minimum force exerted on the sleeve respectively, and M = Mass on the sleeve)
(A) (m.g + S₁)/(m.g + S₂) = r₁/r₂
(B) (m.g - S₁)/(m.g - S₂) = r₂/r₁
(C) S₁/S₂ = r₁/r₂
(D) S₂/S₁ = r₁/r₂

8. The absolute acceleration of any point ‘P’ in a link about center of rotation ‘O’ is
(A) Along PO
(B) Perpendicular to PO
(C) At 45° to PO
(D) None of the above

9. Pulley in a belt drive acts as
(A) Cylindrical pair
(B) Turning pair
(C) Rolling pair
(D) Sliding pair

10. The frictional torque transmitted by a disc or plate clutch is same as that of
(A) Flat pivot bearing
(B) Flat collar bearing
(C) Conical pivot bearing
(D) Truncated conical pivot bearing

11. The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
(A) One lower pair and two additional links
(B) Two lower pairs and one additional link
(C) Two lower pairs and two additional links
(D) Any one of these

12. When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
(A) Return to equilibrium position without oscillation
(B) Oscillate with increasing time period
(C) Oscillate with decreasing amplitude
(D) Oscillate with constant amplitude

13. Bifilar suspension method is used to find the
(A) Angular acceleration of the body
(B) Moment of inertia of the body
(C) Periodic time of the body
(D) Frequency of vibration of the body

14. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
(A) To dip the nose and tail
(B) To raise the nose and tail
(C) To raise the nose and dip the tail
(D) To dip the nose and raise the tail

15. The centre distance between two meshing involute gears is equal to
(A) Sum of base circle radii / cosÏ†
(B) Difference of base circle radii / cosÏ†
(C) Sum of pitch circle radii / cosÏ†
(D) Difference of pitch circle radii / cosÏ†

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