Question:

What is the value of the overcut that is obtained using ECM?

A.

0.3 mm

B.

0.5 mm

C.

0.7 mm

D.

0.9 mm

Answer» b. 0.5 mm

Question:

If there is a change in the selected machining conditions, it will have impact on which of the following?

A.

process accuracy

B.

surface finish

C.

process accuracy & surface finish

D.

none of the mentioned

Answer» c. process accuracy & surface finish

Question:

Surface roughness depend on which of the following quantities?

A.

crystallographic irregularities

B.

alloy composition

C.

distribution of current density

D.

all of the mentioned

Answer» d. all of the mentioned

Question:

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

Answer» a. high

Question:

State whether the following statement is true or false regarding the working principles. “In ECM, grain boundary attacks remove the grains through electrolytic forces.”

A.

true

B.

false

Answer» a. true

Question:

Between which values does the side gap’s surface roughness vary?

A.

>1 µm

B.

>3 µm

C.

>5 µm

D.

>7 µm

Answer» c. >5 µm

Question:

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

Answer» a. wider

Question:

Current efficiency depends on which of the following in ECM?

A.

anodic material

B.

electrolyte

C.

anodic material & electrolyte

D.

none of the mentioned

Answer» c. anodic material & electrolyte

Question:

If the current density is high as required, what type of machining occurs?

A.

pitting

B.

polishing

C.

etching

D.

all of the mentioned

Answer» b. polishing

Question:

For alloys, which type of electrolyte is used in ECM?

A.

single component

B.

double component

C.

multi component

D.

triple component

Answer» c. multi component