Theory of Machines On-line Practice Test - Set 15 - ObjectiveBooks

# Practice Test: Question Set - 15

1. The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
(A) sinα = b/c
(B) cosα = c/b
(C) tanα = c/2b
(D) cotα = c/2b

2. One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)
(A) 2π. √(g/δ)
(B) 1/2π. √(g/δ)
(C) 2π. √(δ/g)
(D) 1/2π. √(δ/g)

3. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on
(A) A triangle
(B) A point
(C) Two lines
(D) A straight line

4. Klein's construction can be used when
(A) Crank has a uniform angular velocity
(B) Crank has non-uniform velocity
(C) Crank has uniform angular acceleration
(D) Crank has uniform angular velocity and angular acceleration

5. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as
(A) Turning pair
(B) Rolling pair
(C) Sliding pair
(D) Spherical pair

6. The two elements of a pair are said to form a _________ when they permit relative motion between them.
(A) Open pair
(B) Kinematic pair
(C) Sliding pair
(D) None of these

7. When the axes of the first and last wheels are coaxial, then the train is known as
(A) Simple train of wheels
(B) Compound train of wheels
(C) Reverted gear train
(D) Epicyclic gear train

8. A body in motion will be subjected to Coriolis acceleration when that body is
(A) In plane rotation with variable velocity
(B) In plane translation with variable velocity
(C) In plane motion which is a resultant of plane translation and rotation
(D) Restrained to rotate while sliding over another body

9. In involute gears, the pressure angle is
(A) Dependent on the size of teeth
(B) Dependent on the size of gears
(C) Always constant
(D) Always variable

10. In a reciprocating engine, usually __________ of the reciprocating masses are balanced.
(A) One-half
(B) Two-third
(C) Three-fourth
(D) Whole

11. The included angle for the V-belt is usually
(A) 10° to 20°
(B) 20° to 30°
(C) 30° to 40°
(D) 60° to 80°

12. If there are L number of links in a mechanism, then number of possible inversions is equal to
(A) L + 1
(B) L - 1
(C) L
(D) L + 2

13. Relationship between the number of links (L) and number of pairs (P) is
(A) P = 2L - 4
(B) P = 2L + 4
(C) P = 2L + 2
(D) P = 2L - 2

14. Which of the following is an example of a higher pair?
(A) Toothed gearing
(B) Belt and rope drive
(C) Ball and roller bearing
(D) All of these

15. When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
(A) To move the ship towards starboard
(B) To move the ship towards port side
(C) To raise the bow and lower the stern
(D) To raise the stern and lower the bow

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