Electric Drives and Motors MCQ Part-8

1. Arc blow results in____________.

a. Splashing out of metal from weld puddle

b. Shallow weld puddle giving rise to weak weld

c. Non-uniform weld beads

d. All of the above defects

 

2. In an electric welding, major personal hazards are________.

a. Flying sparks

b. Harmful infrared and ultraviolet rays from the arc

c. Weld spatter

d. All of the above

 

3. In a DC arc welding__________.

a. Both electrode as well as workspace are made -ve

b. Both electrode as well as workspace are made +ve

c. Electrode is made +ve and workplace -ve

d. Electrode is made -ve and workplace +ve

4. The length of arc required depends on__________.

a. Position of welding

b. Kind of electrodes used, its coating and its diameter

c. Magnitude of current used

d. All of the above

 

5. Overhead welding position is thought to be the most_________.

a. Difficult 

b. Useful

c. Economical

d. Hazardous

 

6. The electrode is coated in order to__________.

a. Prevent atmospheric contamination

b. Provide shielding to weld pool

c. Cleanse the base metal

d. Improve bead quality

 

7. The purpose of coating on arc welding electrodes is to__________.

a. Stabilise the arc

b. Provide a protective covering

c. Provide slag for protection of the molten metal

d. All of the above

 

8. Carbon arc welding __________.

a. Is not suitable for vertical and overhead welding

b. Cannot be done with ac supply

c. Uses carbon or graphite rod as a negative electrode and work to be welded as a positive

d. All of the above

9. Carbon arc welding is suitable particularly for________ metals.

a. Ferrous 

b. Non-ferrous

c. All

10. Helium produces__________.

a. Deep penetration

b. Narrower heat affected zone in base metal

c. Faster welding speeds

d. All of the above

11. In argon arc welding, argon is used as________.

a. A flux

b. A source of heat

c. A shield to protect the work from oxidation

d. An agent for heat transfer

12. Submerged arc process is characterized by________.

a. Deep penetration

b. Exceptionally smooth beads

c. High welding current

d. All of the above

 

13. Electrode is not consumed in case of_________.

a. MIG welding

b. Atomic hydrogen arc welding

c. TIG welding

d. All of the above

14. AC welding machine cannot be used for________.

a. Atomic hydrogen welding

b. MIG welding 

c. Submerged arc welding

d. Resistance welding

15. Welding leads have_________.

a. High flexibility

b. High current carrying capacity

c. Both (a) and (b)

d. None of the above

16. Which of the following is different from the remaining ?

a. MIG welding

b. TIG welding

c. Electro-slag welding

d. Butt welding

 

17. The danger of electric shock is maximum_________.

a. After welding

b. While inserting electrode into the holder

c. During arcing

d. Before welding

18. In a welded joint poor fusion is on account of __________.

a. Lack of flux

b. Uncleaned metal surface

c. High welding speed

d. Improper current

 

19. Which of the following uses consumable electrodes ?

a. Laser

b. TIG 

c. MIG

d. None of the above

20. In welding, weld spatter defect is generally because of too______ during welding.

a. Low current

b. Low voltage

c. High current

d. High voltage

21. Grey iron is usually welded by_______.

a. Arc welding

b. TIG welding

c. Resistance welding

d. Gas welding

 

22. Steel pipes are manufactured by________.

a. Thermit welding

b. Resistance welding

c. Argon arc welding

d. Arc welding

23. Aircraft body is_________.

a. Spot welded

b. Gas welded

c. Seam welded

d. Rivetted

 

24. A seamless pipe has__________.

a. Spot welded joint

b. Arc welded joint

c. No joint

d. Either (a) or (b)

25. Light______________.

a. Consists of shooting particles

b. Consists of electromagnetic waves

c. Is a form of electrical energy

d. Is a form of heat energy

26. The sensors in the eye are known as_________.

a. Rodes and cones

b. Wires and nerves

c. Retina and antenna

d. None of the above

• Electric Drives and Motors MCQ Part-1
• Electric Drives and motors MCQ Part-2
• Electric Drives and Motors MCQ Part-3
• Electric Drives and Motors MCQ Part-4
• Electric Drives and Motors MCQ Part-5
• Electric Drives and Motors MCQ Part-6
• Electric Drives and Motors MCQ Part-7
• Electric Drives and Motors MCQ Part-9
• Electric Drives and Motors MCQ Part-10