# 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) 2

*D/T*

- (D) 2

*T/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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