mcq arc welding machine (part-1)

 1. An electrode-holder is a device used to grip and manipulate the electrode during welding. what is it   made of ?

     (a) Mild steel

     (b) Copper /Copper alloy

     (c) Plastic

     (d) Brass

      Ans. (b)

2. An earth clamp is used to connect the earth cable firmly to the job or welding table. what is it made of ?

    (a) Mild steel

     (b) Copper /Copper alloy

     (c) Plastic

     (d) Brass

     Ans. (b)

3. Which type of transformer used in arc welding ?

     (a). Step up

     (b). Step down

     (c). One - to - one

     (d). Capable of increasing supply voltage

     Ans. (b)

4. A welding transformer may be

     

     (a). air-cooled or water-cooled

     (b). water-cooled or oil-cooled

     (c). air-cooled or oil-cooled

     (d). air-cooled, water-cooled and oil-cooled

     Ans. (c)

5. Which is used for arc welding if there is no electric power supply?

     (a) Rectifier set 

     (b) Transformer set

     (c) Motor generator set

     (d) Engine generator

     Ans. (c)

6. Which one of the following is used to convert AC to DC supply in a welding machine?

     (a) Rectifier set 

     (b) Transformer set

     (c) Motor generator set

     (d) Engine generator

     Ans. (a)

7. The size of a welding machine determined by

     (a) Input amperage 

     (b) Output amperage

     (c) Open circuit voltage

     (d) Closed circuit voltage

     Ans. (b)

8. Welding transformers are equipped with condensers so as to improve

     (a) Power factor

     (b) Energy factor

     (c) Voltage factor

     (d) Current factor

      Ans. (a)

9. The voltage drop across an arc depends upon

     (a) Arc length and atmosphere in which it is operating

     (b) Arc length and base metal

     (c) Base metal and atmosphere in which arc is operating

     (d) Base metal, arc length and atmosphere in which it is operating

   

      Ans. (a)

10. As compared to an air-cooled welding machine, an oil-cooled welding machine has

     (a) higher duty cycle

     (b) lower duty cycle

     (c) same duty cycle

     (d) nearly same duty cycle

      Ans. (a)

11. To get DC for welding, it is necessary have either

     (a) Transformer or motor-generator set

     (b) Rectifier or transformer set

     (c) Rectifier or motor-generator set

     (d) Capacitor or reactor set

      Ans. (c)

12. Transformer is used in welding to supply

     (a) Less welding current

     (b) Less welding voltage

     (c) More welding voltage and more welding current

     (d) Less welding voltage and more welding current

     Ans. (d)

13. Which type of metal used in a welding cable?

        (a) Iron

        (b) Brass

        (c) Bronze

        (d) Coper

        Ans. (d)

14.  An arc cannot be maintained with a voltage lower than

        

        (a) 14 volts            

        (b) 24 volts

        (c) 34 volts

        (d) 44 volts

        Ans . (a)

15. In arc welding the source of heat is 

        (a) current

        (b) arc voltage

        (c) electricity

        (d) welding transformer

        Ans. (c)

16. Which one of the following is not true about air-cooled transformer ?

        (a) Light weight 

        (b) Less expensive

        (c) Uses more electricity

        (d) Uses less electricity

        Ans. (d)