Theory Of Machine - Practice Test

[#351] 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

Correct Answer

(A) Sliding and turning pairs

[#352] The number of links in pantograph mechanism is equal to

(A) 2

(B) 3

(C) 4

(D) 5

Correct Answer

(C) 4

Explanation

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 .

[#353] The indicator using Watt mechanism is known as

(A) Thompson indicator

(B) Richard indicator

(C) Simplex indicator

(D) Thomson indicator

Correct Answer

(B) Richard indicator

[#354] 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 O 2 or O 12 , but proper selection should be made

Correct Answer

(D) The double center can be denoted either by O 2 or O 12 , but proper selection should be made

[#355] In a Hartnell governor, the lift of the sleeve is given by (where r 1 and r 2 = Max. and Min. radii of rotation, x = Length of ball arm of the lever and y = Length of sleeve arm of the lever)

(A) $$left( {{{ ext{r}}_1} + {{ ext{r}}_2}} ight)frac{{ ext{y}}}{{ ext{x}}}$$

(B) $$left( {{{ ext{r}}_1} + {{ ext{r}}_2}} ight)frac{{ ext{x}}}{{ ext{y}}}$$

(C) $$left( {{{ ext{r}}_1} - {{ ext{r}}_2}} ight)frac{{ ext{y}}}{{ ext{x}}}$$

(D) $$left( {{{ ext{r}}_1} - {{ ext{r}}_2}} ight)frac{{ ext{x}}}{{ ext{y}}}$$

Correct Answer

(C) $$left( {{{ ext{r}}_1} - {{ ext{r}}_2}} ight)frac{{ ext{y}}}{{ ext{x}}}$$

Theory Of Machine - Study Mode

[#351] The Scott-Russell mechanism consists of

Correct Answer

[#352] The number of links in pantograph mechanism is equal to

Correct Answer

Explanation

[#353] The indicator using Watt mechanism is known as

Correct Answer

[#354] Which is the false statement about the properties of instantaneous center?

Correct Answer

[#355] In a Hartnell governor, the lift of the sleeve is given by (where r 1 and r 2 = Max. and Min. radii of rotation, x = Length of ball arm of the lever and y = Length of sleeve arm of the lever)

Correct Answer