Electrical Heating MCQ Part 1
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Attempt Free Electrical Heating MCQ Part 1 Here. Read The Important Electrical MCQ From Below.
Q1. 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
Ans. A
Q2. In a resistance furnace the atmosphere is ____
A. oxidising
B. deoxidising
C. reducing
D. neutral
Ans. A
Electrical Heating MCQ Part 1
Q3. 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
Ans. A
Q4. 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
Ans. A
Electrical Heating MCQ Part 1
Q5. 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
Ans. D
Q6. Which of the following heating methods has maximum power factor ?
A. Arc heating
B. Dielectric heating
C. Induction heating
D. Resistance heating
Ans. D
Electrical Heating MCQ Part 1
Q7. The process of heat transfer during the re-entry of satellites and missiles, at very high speeds, into earths atmosphere is known as
A. ablation [Correct Answer]
B. radiation
C. viscous dissipation
D. irradiation
Answer : A
Q8. By which of the following methods the temperature inside a resistance furnace 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 [Correct Answer]
Answer : D
Electrical Heating MCQ Part 1
Q9. In resistance heating highest working temperature is obtained from heating elements made of ____
A. nickel copper
B. nichrome
C. silicon carbide [Correct Answer]
D. silver
Answer : C
Q10. Ajax Wyatt furnace is started when
A. it is filled below core level
B. it is filled above core level [Correct Answer]
C. it is fully empty
D. none of the above
Answer : B
Electrical Heating MCQ Part 1
Q11. The electrode of a direct arc furnace is made of
A. tungsten
B. graphite [Correct Answer]
C. silver
D. copper
Answer : B
Q12. ____ method has leading power factor
A. Resistance heating
B. Dielectric heating [Correct Answer]
C. Arc heating
D. Induction heating
Answer : B
Q13. Which of the following has the highest value of thermal conductivity ?
A. Water
B. Steam
C. Solid ice [Correct Answer]
D. Melting ice
Answer : C
Electrical Heating MCQ Part 1
Q14. In induction heating ____ is abnormally high.
A. phase angle
B. frequency [Correct Answer]
C. current
D. voltage
Answer : B
Q15. For intermittent work which of the following furnaces is suitable ?
A. Indirect arc furnace [Correct Answer]
B. Core less furnace
C. Either of the above
D. None of the above
Answer : A
Electrical Heating MCQ Part 1
