Q1: What are Precision Measuring Instruments?
Ans: Precision measuring instruments are tools used to measure dimensions with very high accuracy and small least count.
Q2: Name some Precision Measuring Instruments.
Ans: Some precision measuring instruments are:
- ➔ Vernier Caliper
- ➔ Micrometer Screw Gauge
- ➔ Vernier Height Gauge
- ➔ Dial Indicator
Q3: What is a Vernier Height Gauge?
Ans: A Vernier height gauge is a precision instrument used to measure and mark vertical heights from a surface plate.
Q4: Name some parts of Vernier Height Gauge.
Ans: Parts are:
- ➔ Base
- ➔ Main scale
- ➔ Vernier scale
- ➔ Sliding carriage
- ➔ Measuring jaw/scriber
- ➔ Fine adjustment screw
Q5: State the working principle of Vernier Height Gauge.
Ans: It works on the vernier scale principle.
The height is measured by moving the slider along the main scale and reading vernier scale values for precision.
Q6: What is the Least Count of a Vernier Height Gauge?
Ans: The least count is usually 0.02 mm.
Q7: State some precautionary measures while using a Vernier Height Gauge.
Ans: Precautions are:
- ➔ Keep surface plate clean
- ➔ Ensure proper zero setting
- ➔ Do not apply excessive force
- ➔ Handle carefully to avoid damage
Q8: State the uses of Vernier Height Gauge.
Ans: Uses are:
- ➔ Measuring vertical heights
- ➔ Marking layout lines
- ➔ Checking dimensions on surface plate
Q9: What is a Vernier Depth Gauge?
Ans: A Vernier depth gauge is a precision instrument used to measure the depth of holes, slots, and recesses.
Q10: Name some parts of Vernier Depth Gauge.
Ans: Parts are:
- ➔ Main scale
- ➔ Vernier scale
- ➔ Base
- ➔ Depth rod
- ➔ Lock screw
Q11: State the working principle of Vernier Depth Gauge.
Ans: It works on the vernier principle.
The depth rod moves into the hole and readings are taken from main and vernier scales.
Q12: What is the Least Count of a Vernier Depth Gauge?
Ans: The least count is usually 0.02 mm.
Q13: State some precautionary measures while using a Vernier Depth Gauge.
Ans: Precautions are:
- ➔ Keep base flat on surface
- ➔ Avoid tilting during measurement
- ➔ Check zero error
- ➔ Handle carefully
Q14: State the uses of Vernier Depth Gauge.
Ans: Uses are:
- ➔ Measuring depth of holes
- ➔ Measuring slots and grooves
- ➔ Inspection work
Q15: What is an Inside Micrometer?
Ans: An inside micrometer is a precision instrument used to measure internal dimensions like bore diameters and inside widths.
Q16: Name some parts of an Inside Micrometer.
Ans: Parts are:
- ➔ Measuring rods
- ➔ Spindle
- ➔ Thimble
- ➔ Ratchet stop
- ➔ Lock nut
Q17: State the types of an Inside Micrometer.
Ans: Types are:
- ➔ Rod type inside micrometer
- ➔ Caliper type inside micrometer
Q18: State the working principle of an Inside Micrometer.
Ans: It works on the screw and nut principle.
Rotational movement is converted into linear movement to measure internal dimensions accurately.
Q19: What is the Least Count of an Inside Micrometer?
Ans: The least count is usually 0.01 mm.
Q20: State some precautionary measures while using an Inside Micrometer.
Ans: Precautions are:
- ➔ Do not apply excess force
- ➔ Clean measuring surfaces
- ➔ Check zero error
- ➔ Handle carefully
Q21: State the uses of an Inside Micrometer.
Ans: Uses are:
- ➔ Measuring internal diameters
- ➔ Measuring bore sizes
- ➔ Inspection of machine parts
Q22: What is a Depth Micrometer?
Ans: A depth micrometer is a precision measuring instrument used to measure the depth of holes, slots, grooves, and recesses accurately.
Q23: Name some parts of a Depth Micrometer.
Ans: Parts are:
- ➔ Base plate
- ➔ Spindle
- ➔ Thimble
- ➔ Sleeve (barrel)
- ➔ Ratchet stop
- ➔ Lock nut
Q24: State the working principle of a Depth Micrometer.
Ans: It works on the screw and nut principle.
The spindle moves linearly when rotated, allowing precise depth measurement.
Q25: What is the Least Count of a Depth Micrometer?
Ans: The least count is usually 0.01 mm.
Q26: State some precautionary measures while using a Depth Micrometer.
Ans: Precautions are:
- ➔ Keep base flat on surface
- ➔ Do not tilt during measurement
- ➔ Clean before use
- ➔ Check zero error
Q27: State the uses of a Depth Micrometer.
Ans: Uses are:
- ➔ Measuring depth of holes
- ➔ Measuring slots and grooves
- ➔ Inspection of machined parts
Q28: What is a Thread Micrometer?
Ans: A thread micrometer is a precision instrument used to measure the pitch diameter of screw threads accurately.
Q29: Name some parts of a Thread Micrometer.
Ans: Parts are:
- ➔ Frame
- ➔ Spindle
- ➔ Anvil (threaded/V-shaped)
- ➔ Thimble
- ➔ Ratchet stop
Q30: State the working principle of a Thread Micrometer.
Ans: It works on the screw and nut principle.
Special V-shaped anvils measure the pitch diameter of threads accurately.
Q31: What is the Least Count of a Thread Micrometer?
Ans: The least count is usually 0.01 mm.
Q32: State some precautionary measures while using a Thread Micrometer.
Ans: Precautions are:
- ➔ Handle carefully
- ➔ Do not apply excess force
- ➔ Clean thread surfaces before use
- ➔ Check zero error
Q33: State the uses of a Thread Micrometer.
Ans: Uses are:
- ➔ Measuring pitch diameter of threads
- ➔ Inspection of screws and bolts
- ➔ Quality control in manufacturing
Q34: State the calibrations of a Micrometer.
Ans: Calibration of a micrometer means checking and adjusting its accuracy using standard gauge blocks to ensure correct readings.
Q35: State the adjustments of a Micrometer.
Ans: Adjustments of a micrometer include:
- ➔ Zero adjustment
- ➔ Sleeve alignment adjustment
- ➔ Ratchet pressure adjustment
Q36: What is a Hot Gauge Micrometer?
Ans: A hot gauge micrometer is a special micrometer used to measure dimensions of hot or heated workpieces with temperature compensation.
Q37: What is a Vernier Micrometer?
Ans: A vernier micrometer is a micrometer fitted with a vernier scale to increase measurement accuracy beyond standard micrometer readings.
Q38: What is a Gear Tooth Vernier?
Ans: A gear tooth vernier is a precision instrument used to measure the tooth thickness and chordal height of gear teeth.
