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Heating and Welding MCQs

Heating and Welding MCQs

Welding is defined as a fabrication process wherein two or more than two parts are fused together using heat, pressure, or a combination of both to form a join as the parts cool. Welding is unique from brazing and melting in terms that it doesn’t melt the base metal. Generally, a filler material is added to the joint to form a pool of molten material that cools to form a joint. MCQs.net shares top 10 MCQs on heating and welding.

Which of following materials has the highest value of thermal conductivity

Which of following materials has the highest value of thermal conductivity

  1. Aluminum
  2. Brass
  3. Copper
  4. Steel

Correct answer: 3. Copper

Thermal conductivity of materials:

  • Aluminum – 247 W/m.K
  • Aluminum nitride – 310 W/m.K
  • Copper – 398 W/m.K
  • Diamond – 2000 – 2200 W/m.K
  • Gold – 315 W/m.K
  • Graphite 168 W/m.K
  • Silicon carbide – 270 W/m.K
  • Silver – 429 W/m.K
  • Tungsten – 173 W/m.K
  • Zinc 116 W/m.K

Heating method that has leading power factor

Heating method that has leading power factor

  1. Resistance heating
  2. Dielectric heating
  3. Arc heating
  4. Induction heating

Correct answer: 2. Dielectric heating

The abnormally high parameter in induction heating is

The abnormally high parameter in induction heating is:

  1. Current
  2. Frequency
  3. Phase angle
  4. Voltage

Correct answer: 2. Frequency

The arc in the welding has

The arc in the welding has

  1. Positive resistance characteristics
  2. Negative resistance characteristics
  3. Linear resistance characteristics
  4. Highly inductive characteristics

Correct answer: 2. Negative resistance characteristics

Explanation: During arc welding when supply is provided across the conductors separated by some distance, the air gap between the two conductors gets ionized. As the arc welding is in progress, the ionization of the arc path and its surrounding area increases. With an increase in current the temperature increases, and in turn the conductivity increases as a result of which more ions are formed. As a result of this the arc resistance is lowered and the arc voltage is decreased. Because the voltage drops with higher currents we say that the arc has a negative resistance characteristic.

Electrode in argon arc welding is made of

Electrode in argon arc welding is made of

  1. Carbon
  2. Steel
  3. Tungsten
  4. None of these

Correct answer.3. Tungsten

Explanation: The electrode in argon arc welding is made of tungsten. Argon arc welding enables aluminum, magnesium, stainless steel and copper to be fusion welded without the necessity of flux. Equipment for argon arc welding include torch, electrical supply and argon.

Steel pipes are manufactured using

Steel pipes are manufactured using:

  1. Arc welding
  2. Argon arc welding
  3. Thermit welding
  4. Resistance welding

Correct answer: 4. Resistance welding

Explanation: Resistance welding is the process of joining two metals together using the heat generated by the resistance offered to the flow of electric current at the junctions of two metals.

The unit for thermal conductivity is

The unit for thermal conductivity is:

  1. W/m °K
  2. W/m2 °C
  3. W2/m °K
  4. W2/m2 °K

Correct answer: 1. W/m °K

Electrode is not consumed during

Electrode is not consumed during

  1. AC arc welding
  2. DC arc welding
  3. Gas welding
  4. TIG welding

Correct answer: 4. TIG welding

Explanation: Non-consumable electrodes are defined as those electrodes, which are not consumed during welding. In case of TIG welding the electrodes used are non-consumable.

The element with the least range of temperature

The element with the least range of temperature:

  1. Eureka
  2. Kanthal
  3. Nichrome
  4. Silicon carbide

Correct answer:1. Eureka

Explanation:

  • Melting point of Eureka is around 1220 to 1300°C
  • Melting point of Kanthal is 1,425°C
  • Melting point of Nichrome is 1400°C
  • Melting point of Silicon Carbide is 2,730°C

The SCR contactor in resistance welding will close during

The SCR contactor in resistance welding will close during

  1. Hold time
  2. Squeeze time
  3. Weld time
  4. All of these

Correct answer: 3. Weld time

Which of following is not a type of welding

Which of following is not a type of welding:

  1. Flux core welding
  2. MIG welding
  3. Stick welding
  4. TIG welding
  5. None of these

Correct answer: 5. None of these

Explanation: Of all these given types, are the types of welding in practice. The video below illustrates the difference between these types:

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