Theory Of Machine MCQ Questions & Answers

51

A system in dynamic balance implies that

A) The system is critically damped B) There is no critical speed in the system C) The system is also statically balanced D) There will absolutely no wear of bearings

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Answer & Solution

Answer: Option C

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52

For dynamic balancing of a shaft

A) The net dynamic force acting on the shaft is equal to zero B) The net couple due to the dynamic forces acting on the shaft is equal to zero C) Both (A) and (B) D) None of the above

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Answer & Solution

Answer: Option C

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53

Cross head and guides form a

A) Lower pair B) Higher pair C) Turning pair D) Sliding pair

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Answer & Solution

Answer: Option D

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54

A slider crank chain consists of following numbers of turning and sliding pairs

A) 1, 3 B) 2, 2 C) 3, 1 D) 4, 0

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Answer & Solution

Answer: Option C

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55

A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is $$\alpha $$. The effort applied parallel to the plane is given by (where $$\mu $$ = $$\tan \varphi $$ = Coefficient of friction between the plane and the body)

A) $${\text{P}} = {\text{W}}\tan \alpha $$ B) $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$ C) $${\text{P}} = {\text{W}}\left( {\sin \alpha + \mu \cos \alpha } \right)$$ D) $${\text{P}} = {\text{W}}\left( {\cos \alpha + \mu \sin \alpha } \right)$$

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Answer & Solution

Answer: Option C

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56

The Scott-Russell mechanism consists of

A) Sliding and turning pairs B) Sliding and rotary pairs C) Turning and rotary pairs D) Sliding pairs only

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Answer & Solution

Answer: Option A

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57

The number of links in pantograph mechanism is equal to

A) 2 B) 3 C) 4 D) 5

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Answer & Solution

Answer: Option C

Solution:

The number of links in a pantograph mechanism is equal to 4.

A pantograph mechanism typically consists of:

1. The fixed frame (link 1)

2. The driving link (link 2)

3. The follower link (link 3)

4. The coupler link (link 4)

This arrangement forms a four-bar linkage system.

Therefore, the correct answer is Option C: 4.

58

The indicator using Watt mechanism is known as

A) Thompson indicator B) Richard indicator C) Simplex indicator D) Thomson indicator

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Answer & Solution

Answer: Option B

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59

Which is the false statement about the properties of instantaneous center?

A) At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered B) The two rigid links have no linear velocities relative to each other at the instantaneous center C) The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link D) The double center can be denoted either by O₂ or O₁₂, but proper selection should be made

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Answer & Solution

Answer: Option D

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60

In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and Min. radii of rotation, x = Length of ball arm of the lever and y = Length of sleeve arm of the lever)

A) $$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\frac{{\text{y}}}{{\text{x}}}$$ B) $$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\frac{{\text{x}}}{{\text{y}}}$$ C) $$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\frac{{\text{y}}}{{\text{x}}}$$ D) $$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\frac{{\text{x}}}{{\text{y}}}$$

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Answer & Solution

Answer: Option C

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering