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
- (D) Radius of
journal
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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