Q.1
How many ways are there for making the fixed cores by wire cut EDM process?
  • a) 2
  • b) 3
  • c) 4
  • d) 5
Q.2
_____ grades wire are used in automatic re-threading mechanisms.
  • a) Malleable
  • b) Softer
  • c) Harder
  • d) Commercial
Q.3
For machining of high melting point materials, _____ wires are used.
  • a) gallium
  • b) zinc coated
  • c) aluminium coated
  • d) silver
Q.4
_____ is/are used as di-electric fluid in die sink EDM process.
  • a) Pure water
  • b) Silicone gel
  • c) Petroleum products
  • d) Epoxy resins
Q.5
Which of the following is not the application of wire cut EDM process?
  • a) Machining ejector holes
  • b) Cutting the ejector pins
  • c) Machining cores of various moulds
  • d) Machining of complex shapes made of plastic
Q.6
During mould making by wire cut EDM, it is important to harden ______ to counter the effects of changes in the shape of the workpiece due to heat treatment.
  • a) the insert
  • b) electrode wire
  • c) electrode holding coils
  • d) bolting points in the workpiece
Q.7
Which of the following machining process is usually preferred for cutting of ejectors which are used in mould making?
  • a) Milling
  • b) Hobbing
  • c) Wire-cut EDM
  • d) Die sink EDM
Q.8
The selection of the manufacturing process depends upon ____________
  • a) chemical reactivity between the mould material and the di-electric fluid
  • b) mould shape
  • c) application of the mould
  • d) number of parts to be machined
Q.9
The wire EDM process is used for making moulds with high drafted walls.
  • a) True
  • b) False
Q.10
For manufacturing of complex shapes, soft electrode wires are used.
  • a) True
  • b) False
0 h : 0 m : 1 s