The unbalanced force due to revolving masses

The secondary unbalanced force is __________ the primary unbalanced force.

A

One-half

B

Two-third

C

n times

D

$$\frac{1}{{\text{n}}}$$ times

The unbalanced force due to reciprocating masses

A

Varies in magnitude but constant in direction

B

Varies in direction but constant in magnitude

C

Varies in magnitude and direction both

D

Constant in magnitude and direction both

Which one of the following can completely balance several masses revolving in different planes on a shaft?

A

A single mass in different planes

B

Two masses in any two planes

C

A single mass in one of the planes of the revolving masses

D

Two equal masses in any two planes

The rainfall due to upward movement of air caused by convergence of cold air masses against warm air masses is called ________.

A

Cyclonic rainfall

B

Orographic rainfall

C

Frontal rainfall

D

Convectional rainfall

The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)

A

$${\text{m}}{\omega ^2}{\text{r}}\sin \theta $$

B

$${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$

C

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\sin 2\theta }}{{\text{n}}}$$

D

$${\text{m}}{\omega ^2}{\text{r}}\frac{{\cos2\theta }}{{\text{n}}}$$

In a locomotive, the resultant unbalanced force due to the two cylinders along the line of stroke, is known as

A

Tractive force

B

Swaying couple

C

Hammer blow

D

None of these

A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

A

The sum of the two masses is equal to the total mass of body

B

The center of gravity of the two masses coincides with that of the body

C

The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body

D

All of the above

The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

A

0°

B

90°

C

180°

D

360°

In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as

A

tractive force

B

swaying couple

C

hammer blow

D

none of the mentioned

The unbalanced force due to revolving masses

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