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- Question
Sulphur in cast iron
Options- A. makes the iron soft and easily machinable
- B. increases hardness and brittleness
- C. makes the iron white and hard
- D. aids fusibility and fluidity
- Correct Answer
- increases hardness and brittleness
- 1. Thread grinding requires work speed from
Options- A. 1 to 3 m/min
- B. 5 to 10 m/min
- C. 10 to 14 m/min
- D. 14 to 20 m/min Discuss
- 2. The atomic mass of sulphur is
Options- A. 12
- B. 14
- C. 16
- D. 32 Discuss
- 3. In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
Options- A. sulphur
- B. phosphorus
- C. manganese
- D. silicon Discuss
- 4. In a petrol engine, the mixture has the lowest pressure at the
Options- A. beginning of suction stroke
- B. end of suction stroke
- C. end of compression stroke
- D. none of these Discuss
- 5. In unilateral system of tolerance, the tolerance is allowed on
Options- A. one side of the actual size
- B. one side of the nominal size
- C. both sides of the actual size
- D. both sides of the nominal size Discuss
- 6. Thermit welding is often used in
Options- A. replacing broken gear teeth
- B. repairing broken shears
- C. joining rails, truck frames and locomotive frames etc.
- D. all of the above Discuss
- 7. The load required to produce a unit deflection in a spring is called
Options- A. flexural rigidity
- B. torsional rigidity
- C. spring stiffness
- D. Young's modulus Discuss
- 8. In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
Options- A. high metal removal rate
- B. dry machining
- C. use of soft cutting tool
- D. surface finish Discuss
- 9. Steam turbines may be classified according to
Options- A. direction of steam flow
- B. number of stages
- C. mode of steam action
- D. all of these Discuss
- 10. In metal machining, the work-tool contact zone is a zone where heat is generated due to
Options- A. plastic deformation of metal
- B. burnishing friction
- C. friction between the moving chip and the tool face
- D. none of the above Discuss
More questions
Correct Answer: 1 to 3 m/min
Correct Answer: 32
Correct Answer: phosphorus
Correct Answer: end of suction stroke
Correct Answer: one side of the nominal size
Correct Answer: all of the above
Correct Answer: spring stiffness
Correct Answer: surface finish
Correct Answer: all of these
Correct Answer: burnishing friction
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