Theory Of Machine MCQ Questions & Answers

91

In a screw jack, the effort required to lower the load W is given by

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

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Answer & Solution

Answer: Option C

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92

The factional torque for square thread at the mean radius r while raising load W is given by

A) $${\text{T}} = {\text{Wr}}\tan \left( {\varphi - \alpha } \right)$$ B) $${\text{T}} = {\text{Wr}}\tan \left( {\varphi + \alpha } \right)$$ C) $${\text{T}} = {\text{Wr}}\tan \alpha $$ D) $${\text{T}} = {\text{Wr}}\tan \varphi $$

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Answer & Solution

Answer: Option B

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93

Which of the following is an example of a higher pair?

A) Toothed gearing B) Belt and rope drive C) Ball and roller bearing D) All of these

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Answer & Solution

Answer: Option D

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94

The inversion of a mechanism is

A) Changing of a higher pair to a lower pair B) Turning its upside down C) Obtained by fixing different links in a kinematic chain D) Obtained by reversing the input and output motion

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Answer & Solution

Answer: Option C

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95

Which type of gearing is used in steering system of an automobile?

A) Rack and pinion B) Worm and wheel C) Spiral gears D) None of the above

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Answer & Solution

Answer: Option A

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96

A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

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

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Answer & Solution

Answer: Option C

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97

The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where $$l$$ = Number of links and j = Number of binary joints)

A) n = ($$l$$ - 1) - j B) n = 2($$l$$ - 1) - 2j C) n = 3($$l$$ - 1) - 2j D) n = 4($$l$$ - 1) - 3j

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Answer & Solution

Answer: Option C

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98

The maximum value of the pressure angle in case of cam is kept as

A) 10° B) 14° C) 20° D) 30°

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Answer & Solution

Answer: Option D

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99

The example of higher pair is

A) Belt, rope and chain drives B) Gears, cams C) Ball and roller bearings D) All of the above

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Answer & Solution

Answer: Option D

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100

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where $$\omega $$ = Angular velocity of the cam shaft)

A) $$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\sin \theta $$ B) $$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\sin \theta \sec 2\theta $$ C) $$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\cos \theta $$ D) $$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\cos \theta \,{\text{cosec2}}\theta $$

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Answer & Solution

Answer: Option B

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering