Related Questions

If T is the actual number of teeth on a helical gear and $$\varphi $$ is the helix angle for the teeth, then formative number of teeth is written as
A $${\text{T}}{\sec ^3}\varphi $$
B $${\text{T}}{\sec ^2}\varphi $$
C $$\frac{{\text{T}}}{{{{\sec }^3}\varphi }}$$
D $${\text{Tcosec}}\varphi $$
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.
A Right hand
B Left hand
C Both A and B
D None of these
While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is
A Independent of index change gear ratio
B Dependent on speed change gear ratio
C Interrelated to index change gear ratio
D Independent of speed and index change gear ratio
The helix angle for single helical gears ranges from
A 10° to 15°
B 15° to 20°
C 20° to 35°
D 35° to 50°
The helix angle for double helical gears may be made up to
A 45°
B 60°
C 75°
D 90°
In which of the following type of gear train the first gear and the last gear are co-axial.
A Simple gear train
B Compound gear train
C Reverted gear train
D None of the mentioned
In helical gears, the distance between similar faces of adjacent teeth along a helix on the pitch cylinders normal to the teeth, is called
A normal pitch
B axial pitch
C diametral pitch
D module
A close coil helical spring when subjected to a moment M having its axis along the axis of the helix
A It is subjected to pure bending
B Its mean diameter will decrease
C Its number of coils will increase
D All the above
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
A Larger than
B Smaller than
C Equal to
D None of these
In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)
A $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$
B $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
C $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$
D $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$

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