Machining

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 17 practice questions with answers and explanations: 4 Easy, 13 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A drilling machine is used for:

  1. Producing round holes
  2. Cutting threads on a shaft only
  3. Producing flat surfaces
  4. Sharpening tools
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Answer: A. A twist drill is the usual tool.

Sample Easy question 2

The main parts of a lathe include:

  1. Headstock, tailstock, carriage and bed
  2. Table, knee and column
  3. Ram, vice and base
  4. Spindle, arbor and overarm only
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Answer: A. A lathe turns the work against a single-point tool.

Sample Easy question 3

Which machine tool is used to produce flat surfaces by a reciprocating single-point tool?

  1. Lathe
  2. Grinding machine
  3. Drilling machine
  4. Shaper
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Answer: D. The tool moves back and forth and the table feeds the work.

Sample Medium question 4

Electrical discharge machining (EDM) can machine:

  1. Any electrically conductive material, however hard
  2. Only non-conducting materials
  3. Only soft metals
  4. Only plastics
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Answer: A. Material is removed by sparks between electrode and workpiece.

Sample Medium question 5

In CNC machines, the numerical control program is written in:

  1. G-codes and M-codes
  2. Morse code
  3. HTML
  4. Binary only
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Answer: A. G-codes control motion and M-codes control machine functions.

Sample Medium question 6

A jig is a device that:

  1. Holds the work and guides the cutting tool
  2. Only holds the work
  3. Only guides the operator
  4. Measures the work
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Answer: A. A fixture holds the work but does not guide the tool.

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