When the sleeve of a Porter governor moves downwards, the governor speed

When the sleeve of a Porter governor moves upwards, the governor speed

A

increases

B

decreases

C

remains unaffected

D

none of the mentioned

The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball and M = Mass on the sleeve)

A

$$\frac{{\text{m}}}{{{\text{m}} + {\text{M}}}}$$

B

$$\frac{{\text{M}}}{{{\text{m}} + {\text{M}}}}$$

C

$$\frac{{{\text{m}} + {\text{M}}}}{{\text{m}}}$$

D

$$\frac{{{\text{m}} + {\text{M}}}}{{\text{M}}}$$

The effort of a Porter governor is equal to (where c = Percentage increase in speed, m = Mass of ball and M = Mass on the sleeve)

A

$${\text{c}}\left( {{\text{m}} - {\text{M}}} \right){\text{g}}$$

B

$${\text{c}}\left( {{\text{m}} + {\text{M}}} \right){\text{g}}$$

C

$$\frac{{\text{c}}}{{\left( {{\text{m}} + {\text{M}}} \right){\text{g}}}}$$

D

$$\frac{{\text{c}}}{{\left( {{\text{m}} - {\text{M}}} \right){\text{g}}}}$$

In designing a sleeve coupling, length of the sleeve is taken as (where d = Diameter of the shaft)

A

d + 17 mm

B

2d + 13 mm

C

2d + 20 mm

D

3.5 d

In designing a sleeve coupling, outer diameter of the sleeve is taken as (where d = Diameter of the shaft)

A

d + 17 mm

B

2d + 13 mm

C

2d + 20 mm

D

3.5d

For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

A

governor A is more sensitive than governor B

B

governor B is more sensitive than governor A

C

both governors A and B are equally sensitive

D

none of the mentioned

The distance between two stations, Dhaka and Chittagong is 450 km. A train starts at 5 pm from Dhaka and moves towards chittagong at an average speed of 60 km/hr. Another train starts from Chittagong at 4:20 pm and moves towards Dhaka at an average speed of 80 km/hr. At what time will the two trains meet?

A

6:10 pm

B

7:05 pm

C

8:15 pm

D

6: 35 pm

A truck moves at the speed of 90 km/hr after repairing and moves at the speed of 80 km/hr before repairing. It covers x distance in 8 hours after repairing. How much time (in hours) will it take to cover 4x distance before repairing?

A

48

B

40

C

36

D

28

A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.

A

1 : 1

B

1 : 2

C

1 : 4

D

Cannot be found from the given information.

A Porter governor is a

A

dead weight governor

B

pendulum type governor

C

spring loaded governor

D

inertia governor

When the sleeve of a Porter governor moves downwards, the governor speed

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