1. What is the accuracy of master angle gauges?
a) 0.1 sec
b) 1 sec
c) 0.25 sec
d) 3 sec
Explanation: Master Angle gauges are laboratory standard and most expensive of all. They measure the angle with an accuracy of 0.25 sec.
2. Which gauges are present in the first series (degree) of angle gauges?
a) 5°, 10°, 15°, 25° and 40°
b) 1°, 3°, 9°, 27° and 41°
c) 1°, 5°, 9°, 25° and 45°
d) 5°, 10°, 15°, 30° and 45°
Explanation: The standard angles gauges have 5 gauges present in the first series. They consist of 1°, 3°, 9°, 27° and 41° gauges.
3. How many sets of angle gauges are available?
a) 1
b) 2
c) 3
d) 4
Explanation: Two sets of angle gauges are available. One set with 16 gauges with an accuracy of 1’’ and one set with 13 gauges with 3’’.
4. Which of the following option is true for the given statements?
Statement 1: Any angle up to 120o4’2’’ be made by a direct combination of angle gauges.
Statement 2: Interferometry can be used to calibrate angle gauges.
a) T, F
b) F, F
c) F, T
d) T, T
Explanation: Direct combination of angle gauges can be made up to angle 81o40.9’. For the larger angle, square block is used with angle gauges.
5. What are the two grades of angle gauges?
a) Master and tool room
b) Precise and Normal
c) Standard and Industrial
d) High and low
Explanation: Master grade is laboratory standard and made from steel carbide or tungsten carbide. Tool grade is normal industrial purpose angle gauges made from steel
6. How angle greater than 90° is measured?
a) By repeating gauges
b) Using square plate
c) Using sine bar
d) Using auto collimator
Explanation: Versatility of angle gauges increases when used with a square plate. Square plates with angle gauge can measure angle greater than 90o.
7. Which of the following is not a gauge from standard B angle gauges?
a) 0.05’
b) 1’
c) 27’
d) 30
Explanation: Standard A has 13 gauges and standard B has all gauges from standard A except 0.05’ i.e. 12 gauges.
8. Which of the following is incorrect for vernier height gauge?
a) Both the surfaces of measuring jaw should be at 45o to the base
b) These gauges can be used for scribing purposes
c) Removable clamps are used
d) Surface plate is used as datum surface for measurements
Explanation: Both surfaces of measuring jaw i.e. upper and lower are parallel to the base. It can be used for measurements under or over a surface. In place of measuring jaw, a scriber can be attached to scribe lines.
9. What is the hardness of measuring jaws of vernier height gauge made up of stainless steel?
a) 350 HV
b) 450 HV
c) 550 HV
d) 650 HV
Explanation: The measuring jaws, scriber and underside of a base are made up of good quality steel and high carbon stainless steel. Hardness of these parts is about 700 and 650 HV for good quality steel and stainless steel respectively
10. Which of the following option is correct for the given statements about vernier height gauge?
Statement 1: The projection of scriber beyond the jaw should be 10 mm.
Statement 2: Flatness of working surface of scriber can be checked by the knife edge.
a) Only statement 1 is correct
b) Only statement 2 is correct
c) Both the statements are correct
d) Both the statements are incorrect
Explanation: The scriber is projected at least 25 mm beyond the jaws. Height gauges may also have an offset scriber. Flatness of working surfaces of scriber and measuring jaws is checked by knife edge straight edge or optical flats.