Q1: Name some adjustable Measuring Tools.
Ans: Some adjustable measuring tools are:
- ➔ Vernier Caliper
- ➔ Micrometer Screw Gauge
- ➔ Height Gauge
- ➔ Depth Gauge
Q2: What is a Vernier Caliper?
Ans: A Vernier caliper is a precision measuring instrument used to measure internal, external, and depth dimensions accurately.
Q3: What is a Vernier Caliper used for?
Ans: It is used for:
- ➔ Measuring external dimensions
- ➔ Measuring internal dimensions
- ➔ Measuring depth of holes
Q4: State the types of Vernier Calipers.
Ans: Types are:
- ➔ Type A Vernier Caliper
- ➔ Type B Vernier Caliper
- ➔ Type C Vernier Caliper
Q5: What is Type-A Vernier Caliper?
Ans: Type A Vernier caliper is used for general external and internal measurements with standard jaws.
Q6: What is Type-B Vernier Caliper?
Ans: Type B Vernier caliper is designed with offset jaws for measuring step and special dimensions.
Q7: What is Type-C Vernier Caliper?
Ans: Type C Vernier caliper is used for precise depth and internal measurements with specialized design.
Q8: Name the materials used in a Vernier Caliper.
Ans: Materials used are:
- ➔ Stainless steel
- ➔ Hardened steel
- ➔ Tool steel
Q9: Name some parts of a Vernier Caliper.
Ans: Parts are:
- ➔ Main scale
- ➔ Vernier scale
- ➔ Fixed jaw
- ➔ Movable jaw
- ➔ Depth rod
- ➔ Lock screw
Q10: What is the working principle of a Vernier Caliper?
Ans: It works on the principle of Vernier scale measurement.
The difference between main scale and vernier scale readings gives high precision measurement.
Q11: What is Zero Error in a Vernier Caliper?
Ans: Zero error is the error when the vernier caliper does not read zero when the jaws are fully closed.
Q12: What is the Least Count of a Vernier Caliper?
Ans: The least count is the smallest measurement that can be read by the instrument.
It is usually 0.02 mm.
Q13: Write the formula to calculate the Least Count of a Vernier Caliper.
Ans: Least Count formula is:
LC = 1 MSD − 1 VSD
where
MSD = Main Scale Division
VSD = Vernier Scale Division
Q14: Name some precautionary measures while using a Vernier Caliper.
Ans: Precautions are:
- ➔ Keep instrument clean
- ➔ Do not apply excessive force
- ➔ Check zero error before use
- ➔ Handle carefully to avoid damage
Q15: How do you read a Vernier Caliper?
Ans: Read the main scale reading first.
Then find the vernier scale division that matches exactly.
Add both readings to get the final measurement.
Q16: What is a 25 Division Vernier Scale?
Ans: A 25 division vernier scale means the vernier scale is divided into 25 equal parts to improve measurement accuracy.
Q17: What is a Micrometer?
Ans: A micrometer is a precision measuring instrument used to measure small dimensions very accurately, especially diameter and thickness.
Q18: What is a Micrometer used for?
Ans: It is used for:
- ➔ Measuring small external dimensions
- ➔ Measuring thickness of sheets
- ➔ Measuring wire and rod diameters
Q19: State the types of Micrometer.
Ans: Types of micrometer are:
- ➔ Outside Micrometer
- ➔ Inside Micrometer
- ➔ Depth Micrometer
Q20: Name the materials used in a Micrometer.
Ans: Materials used are:
- ➔ Hardened steel
- ➔ Alloy steel
- ➔ Carbide tips (measuring faces)
Q21: Name some parts of a Micrometer.
Ans: Parts are:
- ➔ Frame
- ➔ Anvil
- ➔ Spindle
- ➔ Sleeve (barrel)
- ➔ Thimble
- ➔ Ratchet stop
Q22: What is the working principle of a Micrometer?
Ans: It works on the principle of screw and nut mechanism.
Rotational movement of the screw is converted into linear movement to measure small dimensions accurately.
Q23: What is Zero Error in a Micrometer?
Ans: Zero error is the error that occurs when the micrometer does not read zero when fully closed.
Q24: What is the Least Count of a Micrometer?
Ans: The least count of a micrometer is usually 0.01 mm.
Q25: Write the formula to calculate the Least Count of a Micrometer.
Ans: Least Count formula is:
LC = Pitch of screw / Number of divisions on circular scale
Q26: Name some precautionary measures while using a Micrometer.
Ans: Precautions are:
- ➔ Do not apply excessive force
- ➔ Clean measuring surfaces before use
- ➔ Check zero error before measurement
- ➔ Handle carefully to avoid damage
Q27: What is an Inch Based Micrometer?
Ans: An inch based micrometer is a micrometer in which measurements are taken in inches using an inch scale system.
Q28: What is a Metric Micrometer?
Ans: A metric micrometer is a micrometer that measures dimensions in millimeters using the metric system.
Q29: How do you read a Micrometer?
Ans: Read the sleeve (main scale) first.
Then read the thimble scale.
Add both readings to get the final measurement.
Q30: What is a Vernier Micrometer (Inch System)?
Ans: A vernier micrometer (inch system) is a micrometer fitted with a vernier scale to improve accuracy in inch-based measurements.
Q31: What is a Vernier Micrometer (Metric System)?
Ans: A vernier micrometer (metric system) is a micrometer with a vernier scale used to increase precision in millimeter measurements.
Q32: Why is a Micrometer better than a Vernier Caliper?
Ans: A micrometer is better because:
- ➔ Higher accuracy
- ➔ Smaller least count
- ➔ Better for precise measurements
Q33: Compare a Micrometer and a Vernier Caliper.
Ans: Comparison:
- ➔ Micrometer: Higher accuracy, Vernier Caliper: Moderate accuracy
- ➔ Micrometer: Small range, Vernier Caliper: Larger range
- ➔ Micrometer: Used for precise work, Vernier Caliper: General purpose
Q34: What is a Dial Indicator?
Ans: A dial indicator is a precision measuring instrument used to measure small linear displacements and deviations.
Q35: What are the uses of Dial Indicator?
Ans: Uses are:
- ➔ Checking flatness
- ➔ Measuring runout
- ➔ Alignment checking
- ➔ Inspection of machine parts
Q36: What is the working principle of a Dial Indicator?
Ans: It works on the gear and rack mechanism.
Linear motion is converted into circular motion to show reading on the dial.
Q37: Name some parts of a Dial Indicator.
Ans: Parts are:
- ➔ Dial face
- ➔ Pointer
- ➔ Plunger
- ➔ Rack and pinion system
- ➔ Bezel
Q38: State some advantages of a Dial Indicator.
Ans: Advantages are:
- ➔ High sensitivity
- ➔ Easy to read
- ➔ Accurate for small deviations
- ➔ Useful in alignment work
Q39: State some precautionary measures while using a Dial Indicator.
Ans: Precautions are:
- ➔ Handle carefully
- ➔ Avoid shock and vibration
- ➔ Check zero setting before use
- ➔ Keep clean and dust-free
Q40: How do you hold a Dial Indicator?
Ans: A dial indicator is held using a magnetic stand or fixture to ensure stable and accurate measurement.
Q41: How do you read a Dial Indicator?
Ans: Observe the movement of the pointer on the dial.
Each division represents a fixed value.
Multiply divisions by least count to get final reading.
Q42: What is the Least Count of a Dial Indicator?
Ans: The least count of a dial indicator is usually 0.01 mm.
