Q.1
What is the shape of the tool maker’s flats?
  • a) Circular
  • b) Rectangular
  • c) Square
  • d) Triangular
Q.2
Which of the following is not true about tool maker’s flats?
  • a) Tool maker’s flats should be free from inclusions
  • b) Tool maker’s flats are of less hardness
  • c) Working surfaces are produced by lapping
  • d) Should be located in a stirred atmosphere
Q.3
Why are shallow grooves provided in larger flats?
  • a) To minimize the possibilities of uneven hardening
  • b) For design purpose
  • c) To maintain high accuracy for a longer period
  • d) To make them lighter
Q.4
Which of the following is not true about the requirements of material selection for tool maker’s flats?
  • a) Suitable surface for the wringing purpose
  • b) High degree of rigidity
  • c) Wear resistance
  • d) Absorb radiant heat
Q.5
What is the tool maker’s flat size which generally uses both the faces as a working surface?
  • a) 30 to 45 mm
  • b) 50 to 75 mm
  • c) 75 to 100 mm
  • d) 100 to 200 mm
Q.6
Which of the following hardness is given by Solid steel tool maker’s flats?
  • a) 93HRC
  • b) 83HRC
  • c) 73HRC
  • d) 63HRC
Q.7
What is the minimum thickness of top in a high precision surface plate?
  • a) 20 mm for 350 mm dia
  • b) 25 mm for 250 mm dia
  • c) 30 mm for 250 mm dia
  • d) 20 mm for 250 mm dia
Q.8
What is the advantage of granite over cast iron in making surface plates?
  • a) Reflects radiant heat
  • b) Won’t rust by moisture
  • c) Strength for given weight is high
  • d) No need of inserts and fasteners
Q.9
Which of the following is true regarding high precision surface plates?
  • a) The top of high precision plate projects about 32 mm beyond the framing
  • b) The top of high precision plate projects about 32 mm below the framing
  • c) The top of high precision plate projects about 12 mm beyond the framing
  • d) The top of high precision plate projects about 12 mm below the framing
Q.10
What is the minimum total depth in high precision surface plates formm dia (nominal size)?
  • a) 60
  • b) 70
  • c) 80
  • d) 90
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