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

Correct Answer: hammer blow

The maximum magnitude of the unbalanced force along the perpendicular to the line of stroke is known as hammer blow. The effect of hammer blow is to cause the variation in pressure between the wheel and the rail.
Bissoy MCQ
#Machine Dynamics #Primary and Secondary Unbalanced Forces of Reciprocating Masses

Related Questions

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 $$4\theta $$

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