Metrology

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 10 practice questions with answers and explanations: 3 Easy, 7 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The least count of a standard vernier calliper is usually:

  1. 1 mm
  2. 0.5 mm
  3. 0.2 mm
  4. 0.02 mm
Show answer

Answer: D. Many verniers have a least count of 0.02 mm, or 0.1 mm on simple ones.

Sample Easy question 2

The least count of a standard micrometer screw gauge is:

  1. 1 mm
  2. 0.01 mm
  3. 0.1 mm
  4. 0.001 mm
Show answer

Answer: B. The pitch is 0.5 mm with 50 divisions on the thimble.

Sample Easy question 3

A dial gauge is mainly used for:

  1. Comparing and checking small variations, such as runout
  2. Measuring large lengths
  3. Marking out
  4. Cutting threads
Show answer

Answer: A. It amplifies small movements of the plunger.

Sample Medium question 4

Interference fit is used when:

  1. A permanent assembly with no relative motion is needed
  2. Lubrication is needed
  3. Parts must be easily disassembled
  4. Parts must slide freely
Show answer

Answer: A. The shaft is larger than the hole before assembly.

Sample Medium question 5

Surface roughness is commonly expressed by:

  1. Rp, the pitch
  2. Rm, the mean diameter
  3. Ra, the arithmetic average roughness
  4. Rt, the temperature
Show answer

Answer: C. It is measured in micrometres.

Sample Medium question 6

Accuracy refers to:

  1. The least count
  2. The size of the instrument
  3. How close a measurement is to the true value
  4. How close repeated measurements are to each other
Show answer

Answer: C. Precision refers to repeatability.

More Technical Subjects (Mechanical) topics for JKSSB Junior Engineer (Mechanical)

Related articles