Heating and Welding MCQ Study Materials - Set 01 - ObjectiveBooks

Heating and Welding MCQ Study Materials - Set 01

Practice Test: Question Set - 01

1. Heat transfer by condition will not occur when
    (A) Bodies are kept in vacuum
    (B) Bodies are immersed in water
    (C) Bodies are exposed to thermal radiations
    (D) Temperatures of the two bodies are identical

2. Which of the following insulating materials was suitable for low temperature applications?
    (A) Asbestos paper
    (B) Diatomaceous earth
    (C) 80 percent magnesia
    (D) Cork

3. By which of the following methods the temperature inside arcane can be varied?
    (A) By disconnecting some of the heating elements
    (B) By varying the operating voltage
    (C) By varying the current through heating elements
    (D) By any of the above method

4. In an electric room heat convector the method of heating used is
    (A) Arc heating
    (B) Resistance heating
    (C) Induction heating
    (D) Dielectric heating

5. For intermittent work which of the following furnaces is suitable?
    (A) Indirect arc furnace
    (B) Core less furnace
    (C) Either of the above
    (D) None of the above

6. In arc furnace the function of choke is
    (A) To stabilize the arc
    (B) To improve power factor
    (C) To reduce severity of the surge
    (D) None of the above

7. In heating the ferromagnetic material by induction heating, heat is produced due to
    (A) Induced current flow through the charge
    (B) Hysteresis loss taking place below Curie temperature
    (C) Due to hysteresis loss as well as eddy current loss taking place in the charge
    (D) None of the above factors

8. Which of the following is an advantage of eddy current heating?
    (A) The amount of heat generated can be controlled accurately
    (B) Heat at very high rate can be generated
    (C) The area of the surface over which heat is produced can be accurately controlled
    (D) All of the above

9. ________ has the highest value of thermal conductivity.
    (A) Copper
    (B) Aluminium
    (C) Brass
    (D) Steel

10. When a body reflects entire radiation incident on it, then it is known as
    (A) White body
    (B) Grey body
    (C) Black body
    (D) Transparent body

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