1. Angular measurement
2. Linear measurement
3. Height measurement
4. Flatness measurement
Flatness measurement
1. Engineer’s parallels
2. Angle gauges
3. Spirit level
4. Bevel protractor
Spirit level
1. Needs to be calibrated
2. Need not be calibrated
3. Contains a calibrated scale
4. Is highly accurate over its complete measuring range
Needs to be calibrated
1. An air gap(a wedge) of varying thickness must exist between the two surfaces
2. An optical flat is required
3. Work surface must be reflective
4. Monochromatic source of light is required
5. All of these
All of these
1. Process capability study
2. Machine accuracy study
3. Both (a) and (b)
4. None of these
Both (a) and (b)
1. To obtain desired fits
2. Because it is not possible to manufacture a size exactly
3. To obtain high accuracye
4. To have proper allowanc
Because it is not possible to manufacture a size exactly
1. Unilateral form
2. Bilateral form
3. Both (a) and (b)
4. None of these
Both (a) and (b)
1. Usually have plus and minus tolerance of equal amount
2. Specifies the total tolerance on both sides of the basic dimension
3. May be expressed as 25.000 + 0.001 – 0.002 mm
4. System defines the theoretically desired size of the basic size
5. All of these
System defines the theoretically desired size of the basic size
1. Dimension is allowed to vary only in one direction
2. Total tolerance is related to a basic dimension
3. Both (a) and (b)
4. None of these
Both (a) and (b)
1. The closeness with which a measurement can be read directly from a measuring instrument
2. A measure of how close the reading is to the true size
3. The difference between measured value and actual value
4. The smallest change is measured that can be measured
A measure of how close the reading is to the true size