Question:

With an increase in unmanned machining hours, what happens to the efficiency of ECM?

A.

increases

B.

reduces

C.

decreases

D.

increase and then decrease

Answer» a. increases

Question:

Which of the following use ECM for different applications?

A.

gas turbines

B.

jet engines

C.

bio medical implants

D.

all of the mentioned

Answer» d. all of the mentioned

Question:

Which type of gap width is necessary for a higher degree of accuracy?

A.

very small

B.

small

C.

medium

D.

high

Answer» b. small

Question:

For a better surface finish, which type of current distribution is required?

A.

even

B.

uneven

C.

even & uneven

D.

none of the mentioned

Answer» a. even

Question:

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

Answer» a. mrr is less than feed rate

Question:

Better surface finish and higher accuracy depend on which of the factors below?

A.

chemical composition of the electrolyte

B.

current density

C.

all of the mentioned

D.

none of the mentioned

Answer» c. all of the mentioned

Question:

Which of the following processes can be done using ECM?

A.

die sinking

B.

profiling and contouring

C.

drilling and trepanning

D.

all of the mentioned

Answer» d. all of the mentioned

Question:

What must be the working voltage in Electrochemical machining?

A.

10 v

B.

20 v

C.

30 v

D.

40 v

Answer» b. 20 v

Question:

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

Answer» b. square root of time

Question:

What must be the value of velocity of the electrolytic solution?

A.

10 to 15 m/s

B.

25 to 50 m/s

C.

60 to 100 m/s d) 120 to 200 m/s

Answer» b. 25 to 50 m/s