Top 550+ Solved Unconventional Machine Process (UMP) MCQ Questions Answer
Q. What must be the value of the pressure of electrolytic solution used in ECM?
a. 1 to 10 kpa
b. 10 to 80 kpa
c. 100 to 200 kpa
d. 300 to 400 kpa
Q. Local metal removal rates are high at which gap locations mentioned below?
a. small gap
b. medium gap
c. large gap
d. none of the mentioned
Q. When local metal removal rates are high, how will be the current density and current efficiency?
a. high
b. medium
c. low
d. very low
Q. Current efficiency depends on which of the following in ECM?
a. anodic material
b. electrolyte
c. anodic material & electrolyte
d. none of the mentioned
Q. In the following ratios of metal dissolved amounts, which one represent the current efficiency?
a. observed to theoretical
b. theoretical to observed
c. all of the mentioned
d. none of the mentioned
Q. Apparent current efficiency is due to which of the following factors?
a. choice of wrong valence
b. passivation of anodic surface
c. gas evolution at anode
d. all of the mentioned
Q. In ECM, gap increase proportional to which relation of time below?
a. square of time
b. square root of time
c. cube of time
d. cube root of time
Q. At constant feed rates what happens to gap thickness?
a. increases
b. decreases
c. becomes constant
d. none of the mentioned
Q. At constant gap thickness material removal becomes equal to feed rate. What is this gap called?
a. equal gap
b. equilibrium gap
c. unique gap
d. narrow gap
Q. If the gap thickness is greater than equilibrium thickness what will be MRR?
a. mrr is less than feed rate
b. mrr is greater than feed rate
c. mrr is equal to feed rate
d. none of the mentioned
Q. During ECM drilling, decrease in feed rates lead to which type of machining gaps?
a. wider
b. narrow
c. small
d. none of the mentioned
Q. Too small gap causes which of the following effects?
a. sparking
b. short circuit
c. sparking & short circuit
d. none of the mentioned
Q. Electro chemical dissolution phase starts with the movement of ions between which two components?
a. cathode and anode
b. cathode and power source
c. power source and anode
d. power source and electrolyte