1. What is the standard reference temperature for the measurement of the accuracy of vernier height gauges?
a) 20 K
b) 20oC
c) 40 K
d) 40oC
Explanation: Temperature of 20oC should be maintained in the room where the test is conducted. A height gauge should rest on a precision surface plate to increase the testing accuracy.
2. Which of the following option is correct for the given statements about vernier height gauge?
Statement 1: Surface of the vernier and beam should have a dull finish.
Statement 2: Springing of measuring jaws is desirable.
a) T, F
b) F, F
c) T, T
d) F, T
Explanation: Surfaces of vernier and beam have a dull finish for easy readings. A magnifying lens is also provided for this purpose. A proper care of vernier height gauges is very important. Springing of jaws is always avoided.
3. Which of the following is used for checking the perpendicular distance from the graduated face of a beam to the graduated face of vernier?
a) Angle gauge
b) Vernier depth gauge
c) Feeler gauge
d) Slip gauge
Explanation: It is measured with a 0.1 mm feeler gauge. Vernier depth gauges are used to measure the depth of holes and recesses
4. Vernier is at which position when the scriber is coplanar with the base?
a) Vernier is exactly at the middle position of the scale
b) Vernier reads 1/4th of the scale
c) Vernier is at 3/4th position
d) Vernier reads zero
Explanation: Scale on the beam is positioned in the manner that vernier reads zero when scriber and base are coplanar. In case of wear, some adjustments are made to reset zero position.
5. Which of the following is correct about vernier height gauges?
a) The scriber should preferably be of more depth than jaw
b) The perpendicular distance between scale graduations and vernier graduations should be more than 0.01 mm
c) The base is lapped up to an accuracy of 0.05 mm
d) Width of interval between adjacent lines should be 1/2 or 1/3 times of the length of shortest graduations
Explanation: Nominal depth of scriber should be same as measuring jaw so that it can be reversed. The base is ground and lapped up to 0.005 mm of accuracy and for this total span of a surface is considered.
6. What is the range of reading error for measuring a range of height gauges of 250 mm?
a) ±0.02
b) ±0.03
c) ±0.04
d) ±0.05
Explanation: The reading error should not exceed ±0.02 mm for measuring a range of height gauge of 250 mm, ±0.04 for more than 250 mm up to 750 mm and ±0.05 mm for more than 750 mm.
7. Which of the following is true for master height gauges?
a) This is a stack of slip gauge blocks
b) Can store readings in memory
c) Less skilled labour
d) Has statistical production control
Explanation: Master height gauge is basically a stack of gauge blocks with a robust housing. They can be used with riser blocks. A simple master height gauge cannot store measurements in memory.
8. How much measuring capacity is increased by using riser blocks with master height gauge?
a) 500 mm
b) 600 mm
c) 700 mm
d) 800 mm
Explanation: Riser blocks are used to adjust the height. With master height gauges it can increase measuring capacity up to 600 mm.
9. Which of the following option is correct for given statements?
Statement 1: Master height gauge is useful in setting other height gauges.
Statement 2: Can provide a BCD output.
a) Only statement 1 is true
b) Both the statements are true
c) Only statement 2 is true
d) Both the statements are not true
Explanation: Master height gauge is used for setting height gauges and provides a high precision standard. BCD output can be provided by electronic digital readout height gauge
10. Which attachment is needed to check squareness and parallelism with master height gauge?
a) Dial test indicator
b) Gauge block
c) Slip rings
d) Micrometer
Explanation: If dial test indicator or lever is attached to master height gauge then this unit can be used to check parallelism and squareness.