1) A good heating element should have
a. High resistivity and low melting point
b. Low resistivity and high melting point
c. High resistivity and high melting point
d. Low resistivity and low melting point
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Answer
Explanation
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ANSWER: High resistivity and high melting point
Explanation:
No explanation is available for this question!
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2) Eureka is an alloy of
a. Nickel and chromium
b. Nickel and copper
c. Iron, chromium and aluminium
d. Nickel, chromium and aluminium
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Answer
Explanation
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ANSWER: Nickel and copper
Explanation:
No explanation is available for this question!
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3) In salt bath heating, the current are allowed to flow only through the
a. Only through the salt bath
b. Only through the material being heated
c. Through both (a) and (b)
d. None of these
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Answer
Explanation
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ANSWER: Only through the salt bath
Explanation:
No explanation is available for this question!
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4) Direct resistance heating method is used in
a. Salt bath furnaces
b. Resistance welding
c. Electrode boiler for heating water
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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5) The sun’s rays reach the earth without heating the atmosphere, this is due to
a. Convection
b. Radiation
c. Conduction
d. None of these
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Answer
Explanation
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ANSWER: Radiation
Explanation:
No explanation is available for this question!
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6) In radiation mode of heat transfer, the heat is transferred from one body to other
a. From molecule to molecule due to the temperature gradient between two parts
b. By actual movement of the heated molecules
c. Without actually heating the medium in between
d. All of these
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Answer
Explanation
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ANSWER: Without actually heating the medium in between
Explanation:
No explanation is available for this question!
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7) The heat can be transferred from high temperature body to low temperature body by
a. Conduction method
b. Convection method
c. Radiation method
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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8) The efficiency of heating is more for
a. Solid fuels
b. Oil heating
c. Gas heating
d. Electric heating
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Answer
Explanation
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ANSWER: Electric heating
Explanation:
No explanation is available for this question!
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