Arm Welders Graduate Trainee Interview Questions and Answers

Propeller shaft of a vehicle is usually hollow to reduce weight and improve fuel efficiency.

• Propeller shafts are typically hollow to reduce weight and improve fuel efficiency

• Hollow propeller shafts are commonly used in modern vehicles

• Solid propeller shafts are heavier and less efficient

First and third angle projection methods are techniques used in engineering drawings to represent a 3D object on a 2D plane.

• First angle projection method is commonly used in Europe and Asia, where the object is imagined to be in the first quadrant of a Cartesian coordinate system.

• Third angle projection method is commonly used in North America, where the object is imagined to be in the third quadrant of a Cartesian coor...read more

Joule's law of heating states that the heat produced in a conductor is directly proportional to the square of the current flowing through it, the resistance of the conductor, and the time for which the current flows.

• Heat produced (Q) = I^2 * R * t

• Where Q is the heat produced, I is the current, R is the resistance, and t is the time.

• The law helps in understanding the relationship between electrical energy and heat gener...read more

Types of welding include MIG, TIG, stick, and flux-cored welding.

• MIG welding uses a wire electrode and shielding gas.

• TIG welding uses a tungsten electrode and inert gas.

• Stick welding uses a consumable electrode coated in flux.

• Flux-cored welding uses a tubular wire filled with flux.

• Other types include spot welding, laser welding, and resistance welding.

Resistance welding is a welding process that joins metal parts by applying pressure and passing current through them.

• Resistance welding uses heat generated by resistance to electric current to join metal parts.

• Common types of resistance welding include spot welding, seam welding, and projection welding.

• It is widely used in automotive, aerospace, and electronics industries.

• Resistance welding is a fast and efficient meth...read more

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are commonly used to step up or step down voltage in electrical power distribution.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.

• The primary coil is connected to a source of alternating current, which creates a changing magnetic field...read more

Step Down transformer is used in resistance welding.

• Step Down transformer reduces the voltage from the power source to a lower voltage suitable for welding.

• It helps in providing the high current needed for welding without overheating the equipment.

• Example: In resistance spot welding, Step Down transformers are commonly used.

A step down transformer is a type of transformer that decreases the voltage from primary winding to secondary winding.

• Step down transformers have more turns in the primary winding than in the secondary winding.

• They are used to reduce the voltage for various applications such as in household appliances.

• Example: A step down transformer may convert 220V to 110V for use in the United States.