Top 550+ Solved Unconventional Machine Process (UMP) MCQ Questions Answer
Q. What are the magnitude of voltages used in Electro discharge machining?
a. 1 to 20 v
b. 20 to 120 v c) 120 to 220 v d) 220 to 320 v
Q. How is material removed in Electro discharge machining?
a. melt and evaporate
b. corrode and break
c. mechanical erosion takes place
d. none of the mentioned
Q. What are the values of pressure of the plasma in EDM?
a. up to 2 atm
b. up to 20 atm
c. up to 200 atm
d. up to 2000 atm
Q. At the end of pulse, super-heated metal evaporates
a. explosively
b. normally
c. periodically
d. occasionally
Q. After the explosion is over, how is the debris carried away?
a. evaporation
b. fresh dielectric
c. old dielectric
d. all of the mentioned
Q. The layer formed when un expelled molten metal solidifies is known as
a. reabsorbed layer
b. recast layer
c. un evaporated layer
d. condensed layer
Q. Amount of material removed from anode and cathode depend on which of the following?
a. electrons
b. positive ions
c. electrons & positive ions
d. none of the mentioned
Q. What happens when the electron current predominates in the discharge?
a. more anodic removal
b. more cathodic removal
c. remains same
d. all of the mentioned
Q. What is the value of gap maintained between the electrodes when we use servo mechanism?
a. 10 – 100 µm
b. 100 – 200 µm
c. 200 – 500 µm
d. 500 – 1000 µm
Q. Based on the electrode gap, which of the following electric pulses are generated?
a. open circuit pulses
b. sparks
c. arcs
d. all of the mentioned
Q. When the electrode gap is too small or electrodes are in contact, how much material is removed?
a. 10%
b. 20%
c. 30%
d. no material removed
Q. Which components mentioned below are affected due to arcs?
a. work piece
b. tool
c. work piece & tool
d. none of the mentioned
Q. Which of the following pulses contribute to the desired material removal in EDM?
a. open circuit pulses
b. short circuits
c. arcs
d. sparks