In screw gauge, there are ______________ types of zero errors.
one
two
three
many
If the zeroth division of the head scale is below the index line ,the error is said to be
Negative
Positive
Neutral
None of these
While measuring the diameter of a lead shot using a screw gauge,the reading on the pitch scale is found to be 7.5 mm and that on the head scale is 48. If the least count is 0.01 mm,the diameter of the lead shot is
0.798 mm
7.98 mm
0.0798 mm
0.00798 mm
The value of the head scale division which just coincides with the reference line is observed as
Head Scale Reading
Ordinary Scale Reading
Pitch Scale Reading
Corrected Head Scale Reading
For positive zero error, the correction and error are :
-ve,+ve
+ve,-ve
+ve, +ve
-ve, -ve
The value of Least count ,L.C =
1mm
0.001 cm
0.01 cm
If the zeroth division of the head scale is below the index line ,the error is said to be positive and the correction is
Equation for Least Count ,L.C =
P / N
PN
N/P
PN2
A screw gauge moves 2 mm on 4 head rotations. The head scale is divided into 50 divisions. Give the Least Count.
1 mm
0.01 mm
0.5 mm
0.05 mm
Screw gauge works on the principle of
Screw in a nut
Lever
Jack and screw
All of the above