Manufacturing Technology (3151912) MCQs

MCQs of Metal Joining Processes

Showing 1 to 10 out of 137 Questions
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1.

For welding plates of thickness less than 5 mm, its edges

(a)

do not require bevelling
(b)

should be bevelled to a single-V or U-groove
(c)

should have a double-V or U-groove on one side
(d)

should have a double-V or U-groove on both sides

 
Answer:

Option (a)

2.

Lap joints are employed on plates having thickness

(a)

less than 3 mm
(b)

5 to 10 mm
(c)

12.5 mm
(d)

above 25 mm
Answer:

Option (a)

3.

Upto what thickness of plate, edge preparation for welding is not required

(a)

4 mm
(b)

6 mm
(c)

8 mm
(d)

10 mm
Answer:

Option (a)

4.

For welding plates of thickness more than 12.5 mm, its edges

(a)

do not require bevelling
(b)

should be bevelled to a single-V or U-groove
(c)

should have a double-V or U-groove on one side
(d)

should have a double-V or U-groove on both sides
Answer:

Option (d)

5.

In electric resistance welding, voltage required for heating is

(a)

1 to 5 volts
(b)

6 to 10 volts
(c)

11 to 20 volts
(d)

50 to 100 volts
Answer:

Option (b)

6.

In electric resistance welding, pressure applied varies from

(a)

1 to 5 Mpa
(b)

5 to 10 Mpa
(c)

10 to 25 Mpa
(d)

25 to 55 Mpa
Answer:

Option (d)

7.

The current in electric resistance welding can be regulated by

(a)

varying the input supply
(b)

changing the primary turns of the transformer
(c)

changing the secondary turns of the transformer
(d)

any one of the above
Answer:

Option (b)

8.

 In reverse polarity welding

(a)

Electrode holder is connected to the negative and work to positive
(b)

.Electrode holder is connected to the positive and work to negative
(c)

Work is positive and holder is earthed
(d)

Holder is positive and work is earthed
Answer:

Option (b)

9.

The welding set up is said to have straight polarity, when

(a)

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

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

work is connected to the positive terminal and the electrode holder is earthed
(d)

work is connected to the negative terminal and the electrode holder is earthed
Answer:

Option (a)

10.

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

(a)

A.C. low frequency
(b)

A.C. high frequency
(c)

D.C.
(d)

All of the above
Answer:

Option (c)

Showing 1 to 10 out of 137 Questions
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