Gate Mechanical Engineering Questions and Answers Pdf - 1

Question: 1

Which of the following is preferred for welding of non-ferrous metals by arc welding?

(A) D.C.

(B) A.C. low frequency

(C) A.C. high frequency

(D) all of the above

Ans: A

D.C.

Question: 2

Metal deposited on to the work piece from the electrode

(A) is attracted towards the work piece due to the negatively polarity of the work piece

(B) is attracted towards the work piece due to the negative polarity of the work piece

(C) falls because of gravity

(D) is forced across the arc

Ans: D

is forced across the arc

Question: 3

In reverse polarity welding

(A) work is positive and holder is earthed

(B) electrode holder is connected to the negative and work to positive

(C) holder is positive and work is earthed

(D) electrode holder is connected to the positive and work to negative

Ans: D

electrode holder is connected to the positive and work to negative

Question: 4

Cores are used to

(A) strengthen moulding sand

(B) make desired recess in castings

(C) remove patterns easily

(D) support looses pieces

Ans: B

make desired recess in castings

Question: 5

A large intricate heavy casting weighing in tons is to be cast. The most appropriate moulding process would be

(A) ceramic moulding

(B) green sand moulding

(C) pit moulding

(D) cement moulding

Ans: C

pit moulding

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