The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

When the pitching of a ship is __________ the effect of gyroscopic couple acting on it will be to move the ship towards port side.

A

Upward

B

Downward

C

Forward

D

Backward

K produces 100 parts twice as fast as G does. G produces 100 parts in 40 minutes. If each produces parts at a constant rate, how many parts will K produces in 6 minutes.

A

30

B

25

C

20

D

15

When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

A

to move the ship towards port side

B

to move the ship towards star-board

C

to raise the bow and lower the stern

D

to raise the stern and lower the bow

The rolling contact bearings as compared to sliding contact bearings have

A

Low starting and low running friction except at very high speeds

B

Accuracy of shaft alignment

C

Small overall dimensions

D

All of the above

What type of bearing is used for main bearings and connecting rod bearings?

A

Ball bearings

B

Plain bearings

C

Needle roller bearing

D

Taper roller bearing

The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by

A

$$\frac{{2\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$

B

$$\frac{{2\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{\text{V}}_{\text{r}}^2}}$$

C

$$\frac{{\left( {{{\text{V}}_{\text{r}}} - {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$

D

$$\frac{{\left( {{{\text{V}}_{\text{r}}} + {\text{v}}} \right){\text{v}}}}{{{{\text{V}}_{\text{r}}}}}$$

The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is

A

40%

B

50%

C

60%

D

80%

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

A

30°

B

60°

C

90°

D

120°

Three forces which act on a rigid body to keep it in equilibrium. The forces must be coplanar and

A

Concurrent

B

Parallel

C

Concurrent parallel

D

None of these

Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.

A

Meet

B

Do not meet

C

Either ‘A’ or ‘B’

D

None of these

The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

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