Theory of Machines MCQ Practice Test - Set 35 - ObjectiveBooks

# Practice Test: Question Set - 35

1. The type of gears used to connect two non parallel and non intersecting shafts is
(A) Spur gear
(B) Helical gear
(C) Bevel gear
(D) Spiral gear

2. In a screw jack, the effort required to lower the load W is given by
(A) P = W tan(Î± - Ï†)
(B) P = W tan(Î± + Ï†)
(C) P = W tan(Ï† - Î±)
(D) P = W cos(Î± + Ï†)

3. A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)
(A) m₁ r₂ = m₂ r₁
(B) m₁ r₁ = m₂ r₂
(C) m₁ m₂ = r₁ r₂
(D) None of these

4. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is
(A) 2
(B) 4
(C) 3
(D) None of the above

5. The secondary unbalanced force is maximum __________ in one revolution of the crank.
(A) Two times
(B) Four times
(C) Eight times
(D) Sixteen times

6. The ratio of the number of teeth to the pitch circle diameter in millimeters, is called
(A) Circular pitch
(B) Diametral pitch
(C) Module
(D) None of these

7. A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when
(A) a is +ve and b = 0
(B) a = 0 and b is +ve
(C) a is +ve and b is -ve
(D) a is +ve and b is also +ve

8. Consider the following mechanisms:
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

Which of the above are inversions of slider crank mechanism?
(A) 1, 2 and 4
(B) 2, 3 and 4
(C) 1, 2 and 3
(D) 1, 3 and 4

9. A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?
(A) All points of the disc have the same velocity
(B) The centre of the disc has zero acceleration
(C) The centre of the disc has centrifugal acceleration
(D) The point on the disc making contact with the plane surface has zero acceleration

10. In railway axle boxes, the bearing used is
(A) Deep groove ball bearing
(B) Double row self aligning ball bearing
(C) Double row spherical roller bearing
(D) Cylindrical roller bearing

11. The rotating shafts tend to vibrate violently at whirling speeds because
(A) The system is unbalanced
(B) Bearing centre line coincides with the axis
(C) The shafts are rotating at very high speeds
(D) Resonance is caused due to the heavy mass of the rotor

12. Which of the following is a higher pair?
(A) Turning pair
(B) Screw pair
(C) Belt and pulley
(D) None of the above

13. The total number of instantaneous centers for a mechanism consisting of n links are
(A) n/2
(B) n
(C) n - 1
(D) n(n - 1)/2

14. The danger of breakage and vibration is maximum
(A) Below the critical speed
(B) Near the critical speed
(C) Above the critical speed
(D) None of these

15. Which one of the following is an exact straight line mechanism using lower pairs?
(A) Watt’s mechanism
(B) Grasshopper mechanism
(C) Robert’s mechanism
(D) Peaucellier’s mechanism

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