Basic Heating and Welding Objective Electrical Questions - Set 03 - ObjectiveBooks

Basic Heating and Welding Objective Electrical Questions - Set 03

Practice Test: Question Set - 03

1. In a domestic cake baking oven the temperature is controlled by
    (A) Voltage variation
    (B) Thermostat
    (C) Autotransformer
    (D) Series-parallel operation

2. In the indirect resistance heating method, maximum heat-transfer takes place by
    (A) Radiation
    (B) Convection
    (C) Conduction
    (D) Any of the above

3. Ajax Wyatt furnace is started when
    (A) It is filled below core level
    (B) It is filled above core level
    (C) It is fully empty
    (D) None of the above

4. Direct arc furnaces have which of the following power factors?
    (A) Unity
    (B) Low, lagging
    (C) Low, leading
    (D) Any of the above

5. Which of the following heating methods has maximum power factor?
    (A) Arc heating
    (B) Dielectric heating
    (C) Induction heating
    (D) Resistance heating

6. A perfect black body is one that
    (A) Transmits all incident radiations
    (B) Absorbs all incident radiations
    (C) Reflects all incident radiations
    (D) Absorbs, reflects and transmits all incident radiations

7. The material of the heating element for a furnace should have
    (A) Lower melting point
    (B) Higher temperature coefficient
    (C) High specific resistance
    (D) All of the above

8. Due to which of the following reasons it is desirable to have short arc length?
    (A) To achieve better heating
    (B) To increase the life of roof refractory
    (C) To have better stirring action
    (D) All of the above

9. Radiant heating is used for which of the following?
    (A) Annealing of metals
    (B) Melting of ferrous metals
    (C) Heating of liquids in electric kettle
    (D) Drying of paints and varnishes

10. In an electric press mica is used
    (A) As an insulator
    (B) As a device for power factor improvement
    (C) For dielectric heating
    (D) For induction heating

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