Heating and Welding Electrical Engineering Questions - Set 02 - ObjectiveBooks

Heating and Welding Electrical Engineering Questions - Set 02

Practice Test: Question Set - 02

1. Heat is transferred simultaneously by condition, convection and radiation
    (A) Inside boiler furnaces
    (B) During melting of ice
    (C) Through the surface of the insulted pipe carrying steam
    (D) From refrigerator coils to freezer of a refrigerator

2. The temperature inside a furnace is usually measured by which of the following?
    (A) Optical pyrometer
    (B) Mercury thermometer
    (C) Alcohol thermometer
    (D) Any of the above

3. In induction heating __________ is abnormally high.
    (A) Phase angle
    (B) Frequency
    (C) Current
    (D) Voltage

4. For heating element high resistivity material is chosen to
    (A) Reduce the length of heating element
    (B) Increase the life of the heating element
    (C) Reduce the effect of oxidation
    (D) Produce large amount of heat

5. Which of the following methods is used to control temperature in resistance furnaces?
    (A) Variation of resistance
    (B) Variation of voltage
    (C) Periodical switching on and off of the supply
    (D) All of the above methods

6. Resistance variation method of temperature control is done by connecting resistance elements in
    (A) Series
    (B) Parallel
    (C) Series-parallel connections
    (D) All of the above ways

7. For radiant heating around 2250°C, the heating elements are made of
    (A) Copper alloy
    (B) Carbon
    (C) Tungsten alloy
    (D) Stainless steel alloy

8. Which of the following is an advantage of heating by electricity?
    (A) Quicker operation
    (B) Higher efficiency
    (C) Absence of flue gases
    (D) All of the above

9. Induction heating process is based on which of the following principles?
    (A) Thermal ion release principle
    (B) Nucleate heating principle
    (C) Resistance heating principle
    (D) Electromagnetic induction principle

10. In a resistance furnace the atmosphere is
    (A) Oxidizing
    (B) Deoxidizing
    (C) Reducing
    (D) Neutral

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