1) The dielectric strength of air gap is
a. 2.11kV/cm
b. 21.1kV/m
c. 21.1kV/cm
d. 2.11kV/m
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Answer
Explanation
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ANSWER: 21.1kV/cm
Explanation:
No explanation is available for this question!
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2) When the air gap is smaller in induction motor then its
a. magnetizing current reduces
b. starting torque increases
c. both a and b
d. neither a nor b
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Answer
Explanation
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ANSWER: magnetizing current reduces
Explanation:
No explanation is available for this question!
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3) The temperature produced in indirect arc furnace is
a. More than in direct arc furnace
b. Less than direct arc furnace
c. Equal to direct arc furnace
d. None of these
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Answer
Explanation
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ANSWER: Less than direct arc furnace
Explanation:
No explanation is available for this question!
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4) Which type of heating is used for sterilization?
a. High frequency eddy current heating
b. Coreless type heating
c. Core type heating
d. Dielectric heating
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Answer
Explanation
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ANSWER: Dielectric heating
Explanation:
No explanation is available for this question!
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5) The rate of heat produced by dielectric heating is increased by
a. Increasing frequency and voltage supply
b. Increasing frequency and decreasing voltage supply
c. Decreasing frequency and voltage supply
d. Decreasing frequency and increasing voltage supply
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Answer
Explanation
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ANSWER: Increasing frequency and voltage supply
Explanation:
No explanation is available for this question!
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6) High frequency eddy current heating is used for
a. Melting of non-ferrous metals
b. High grade alloy steel production
c. Hardening the surfaces of materials being heated
d. Vacuum heating
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Answer
Explanation
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ANSWER: Hardening the surfaces of materials being heated
Explanation:
No explanation is available for this question!
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7) For improving the power factor of coreless type induction furnace,
a. Capacitor is used
b. Inductor is used
c. Resistor is used
d. Transistor is used
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Answer
Explanation
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ANSWER: Capacitor is used
Explanation:
No explanation is available for this question!
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8) In indirect core type of furnace, the element is heated by induction, which transfer the heat to the charge by
a. Conduction
b. Radiation
c. Convection
d. All 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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9) In direct core type induction furnaces, the leakage reactance of the magnetic circuit is
a. High and power factor is also high
b. Low and power factor is high
c. High and power factor is low
d. Low and power factor is also low
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Answer
Explanation
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ANSWER: High and power factor is low
Explanation:
No explanation is available for this question!
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10) The core type induction furnace and the coreless type induction furnace are
a. Low frequency, high frequency
b. Low frequency, low frequency
c. High frequency, high frequency
d. High frequency, low frequency
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Answer
Explanation
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ANSWER: Low frequency, high frequency
Explanation:
No explanation is available for this question!
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