# Practice Test: Question Set - 36

1. The maximum efficiency of a screw jack is
(A) (1 - sinφ)/(1 + sinφ)
(B) (1 + sinφ)/(1 - sinφ)
(C) (1 - tanφ)/(1 + tanφ)
(D) (1 + tanφ)/(1 - tanφ)

2. The velocity of a body moving with simple harmonic motion is __________ at the mean position.
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

3. For an involute gear, the ratio of base circle radius and pitch circle radius is equal to
(A) sinφ
(B) cosφ
(C) secφ
(D) cosecφ

4. Module of a gear is
(A) D/T
(B) T/D
(C) 2D/T
(D) 2T/D

5. A watt's governor can work satisfactorily at speeds from
(A) 60 to 80 r.p.m.
(B) 80 to 100 r.p.m.
(C) 100 to 200 r.p.m.
(D) 200 to 300 r.p.m.

6. A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
(A) Magnitude of the forces on journal
(B) Angular velocity of journal
(C) Clearance between journal and bearing

7. Oldham’s coupling is an inversion of the kinematic chain used in
(A) Whitworth quick return mechanism
(B) Elliptical trammels
(C) Rotary engine
(D) Universal joint

8. The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)
(A) r sinφ
(B) r cosφ
(C) r tanφ
(D) (r/2) cosφ

9. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
(A) Lower pair
(B) Higher pair
(C) Self-closed pair
(D) Force-closed pair

10. In which of the following type of gear train the first gear and the last gear are co-axial.
(A) Simple gear train
(B) Compound gear train
(C) Reverted gear train
(D) None of the above

11. The sensitiveness of the governor __________ as the speed range decreases.
(A) Remains unaffected
(B) Decreases
(C) Increases
(D) None of these

12. In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
(A) Tractive force
(B) Swaying couple
(C) Hammer blow
(D) None of these

13. Sensitiveness of the governor is defined as the ratio of the
(A) Mean speed to the maximum equilibrium speed
(B) Mean speed to the minimum equilibrium speed
(C) Difference of the maximum and minimum equilibrium speeds to the mean speed
(D) Sum of the maximum and minimum equilibrium speeds to the mean speed

14. To connect two parallel and coplanar shafts the following type of gearing is used
(A) Spur gear
(B) Bevel gear
(C) Spiral gear
(D) None of the above

15. The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be
(A) Parallel to each other
(B) Perpendicular to each other
(C) Inclined at 45°
(D) Opposite to each other

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