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

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

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 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°

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

A

0° and 90°

B

180° and 360°

C

Both (A) and (B)

D

None of these

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

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

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank and $$\theta $$ = Angle of inclination of crank to the line of stroke)

A

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

B

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

C

$$\left( {1 - {\text{c}}} \right){\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

D

$${\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at

A

45° to each other

B

90° to each other

C

120° to each other

D

180° to each other

If two forces each equal to ‘T’ in magnitude act at right angles, their effect may be neutralized by a third force acting along their bisector in opposite direction whose magnitude will be

A

2T

B

$$\frac{1}{2}{\text{T}}$$

C

$$\sqrt 2 {\text{ T}}$$

D

3T

When the primary direct crank of a reciprocating engine makes an angle of $$\theta $$ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

A

$$\frac{\theta }{2}$$

B

$$\theta $$

C

$$2\theta $$

D

$$4\theta $$

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

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