Question
The length of a sine bar is the distance between _______.
This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
centre-to-centre distance between rollers
Sine Bar Length Key Definition
The specified length of a sine bar refers to the distance between the centers of its two cylindrical rollers.
This centre-to-centre distance is critical because:
- It serves as the standard reference length (hypotenuse) for angle calculations using the sine rule ($ \sin(\theta) = \frac{\text{height}}{\text{length}} $).
- Accurate angle setting depends directly on this defined length and the height achieved using gauge blocks.
Therefore, the functional length used for precision angle measurement is the distance between the centers of the rollers, not its overall physical dimensions.
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