# Practice Test: Question Set - 12

**1. The axis of precession is __________ to the plane in which the axis of spin is going to rotate.**

- (A) Parallel

- (B) Perpendicular

- (C) Both A and B

- (D) None of
these

**2. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as**

- (A) Damping
factor

- (B) Damping
coefficient

- (C) Logarithmic
decrement

- (D) Magnification
factor

**3. If the radius of gyration of a compound pendulum about an axis through e.g. is more, then its frequency of oscillation will be**

- (A) Less

- (B) More

- (C) Same

- (D) Data
are insufficient to determine same

**4. Klein's construction is useful to determine**

- (A) Velocity
of various parts

- (B) Acceleration of various parts

- (C) Displacement
of various parts

- (D) Angular acceleration of
various parts

**5. In the below figure,**

*PC*is the connecting rod and*OC*is the crank making an angle θ with the line of stroke*PO*and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston*P*is shown by quadrilateral*CQNO*. The acceleration of the piston*P*with respect to the crank-pin*C*is given by- (A)

*ω²*×

*NO*

- (B)

*ω²*×

*CO*

- (C)

*ω²*×

*CN*

- (D)

*ω²*×

*QN*

**6. When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be**

- (A)

*ω²r. (n*+

*1)/n*

- (B)

*ω²r. (n - 1)/n*

- (C)

*ω²r. n/(n*+

*1)*

- (D)

*ω²r. n/(n - 1)*

**7. Under logarithmic decrement, the amplitude of successive vibrations are**

- (A) Constant

- (B) In
arithmetic progression

- (C) In geometric
progression

- (D) In
logarithmic progression

**8. A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis**

- (A) At the origin

- (B) Below the origin

- (C) Above the origin

- (D) Any one of these

**9. Which of the following disciplines provides study of relative motion between the parts of a machine?**

- (A) Theory
of machines

- (B) Applied
mechanics

- (C) Mechanisms

- (D) Kinematics

**10. Cross head and guides form a**

- (A) Lower pair

- (B) Higher
pair

- (C) Turning pair

- (D) Sliding pair

**11. In a coupling rod of a locomotive, each of the four pairs is a ________ pair.**

- (A) Sliding

- (B) Turning

- (C) Rolling

- (D) Screw

**12. The two links**

*OA*and*OB*are connected by a pin joint at*O*. If the link*OA*turns with angular velocity ω₁ rad/s in the clockwise direction and the link*OB*turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint*O*is (where*r*= Radius of the pin at*O*)- (A)

*ω₁.ω₂.r*

- (B)

*(ω₁ - ω₂)r*

- (C)

*(ω₁*+

*ω₂)r*

- (D)

*(ω₁ - ω₂)2r*

**13. The dynamic friction is the friction experienced by a body, when the body**

- (A) Is
in motion

- (B) Is at rest

- (C) Just begins
to slide over the surface of the other body

- (D) None of the
above

**14. The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.**

- (A) Less

- (B) More

- (C) Same

- (D) None of
these

**15. A foot step bearing and rotor of a vertical turbine form examples of**

- (A) Incompletely constrained
motion

- (B) Partially
constrained motion

- (C) Completely
constrained motion

- (D) Successfully
constrained motion

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