Related Questions

If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be
A Less than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and greater than co-efficient of lateral friction
B Less than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and also less than co-efficient of lateral friction
C Greater than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and less than co-efficient of lateral friction
D Greater than $$\frac{{\text{b}}}{{2{\text{h}}}}$$ and also greater than coefficient of lateral friction
A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal force
A The reaction on me inner wheels increases and on the outer wheels decreases
B The reaction on the outer wheels increases and on the inner wheels decreases
C The reaction on the front wheels increases and on the rear wheels decreases
D The reaction on the rear wheels increases and on the front wheels decreases
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
A Remain horizontal
B Slant up towards direction of pull
C Slant down towards direction of pull
D None of the above
‘μ’ is coefficient of friction. A wheeled vehicle travelling on a circular level track will slip and overturn simultaneously if the ratio of its wheel distance to the height of its centroid, is
A μ
B 2μ
C 3μ
D $$\frac{1}{2}$$μ
On a mass ‘m’ describing a circular path of radius ‘r’, the centrifugal force
A Acts tangentially to the circular path
B Acts towards the centre of rotation
C Acts away from the centre of rotation
D Is $$\frac{{{\text{m}}{{\text{w}}^{2{\text{r}}}}}}{g}{\text{kfg}}$$
In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
A Depends upon
B Is independent of
C Either A or B
D None of these
Danielle has been visiting friends in Ridge-wood for the past two weeks. She is leaving tomorrow morning and her flight is very early. Most of her friends live fairly close to the airport. Madison lives ten miles away. Frances lives five miles away, Samantha, seven miles. Alexis is farther away than Frances, but closer than Samantha. Approximately how far away from the airport is Alexis?
A nine miles
B seven miles
C eight miles
D six miles
If Bashar can run around a ground four times in 20 minutes and Rahim can run around the same ground three times in 12 minutes, who can run around that ground more times in an hour, and how many times more can he run around ?
A Bashar, three times more
B Rahim , three times more
C They both go around 12 times
D Bashar, eight times more
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel and $$\varphi $$ = Pressure angle)
A $$\frac{{\left( {{{\text{r}}^2} + {{\text{R}}^2}} \right)\cos \varphi }}{2}$$
B $$\frac{{\left( {{{\text{r}}^2} + {{\text{R}}^2}} \right)\sin \varphi }}{2}$$
C $$\frac{{\left( {{\text{r}} + {\text{R}}} \right)\cos \varphi }}{2}$$
D $$\frac{{\left( {{\text{r}} + {\text{R}}} \right)\sin \varphi }}{2}$$
Cavitation in a centrifugal pump can be avoided by keeping the
A Inlet pressure high
B Outlet pressure low
C Inlet pressure low
D Outlet pressure high

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