Question:

When machining Ti, in Nacl electrolyte, what values of current efficiencies are obtained?

A.

10 – 20 %

B.

20 – 30 %

C.

30 – 50 %

D.

50 – 80 %

Answer» a. 10 – 20 %

Question:

Which of the following material cannot be machined using ECM?

A.

high strength alloys

B.

hardened steels

C.

nonconductive materials

D.

all of the mentioned

Answer» c. nonconductive materials

Question:

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

Answer» a. small gap

Question:

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

Answer» b. equilibrium gap

Question:

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

Answer» a. cathode and anode