Computer Programming MCQs

5739 MCQs  (Page 209 of 574)

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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
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Which of the following insulating materials was suitable for low temperature applications ?
A. Asbestos paper
B. Diatomaceous earth
C. 80 percent magnesia
D. Cork
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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
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By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?
A. Coreless transformers
B. Current transformers
C. Motor-generator set
D. Multi-phase transformer
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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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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. to reduce problem of oxidation
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In a domestic cake baking oven the temperature is controlled by________________?
A. Voltage variation
B. Thermostat
C. Auto-transformer
D. Series-parallel operation
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In direct arc furnace, which of the following has high value ?
A. Current
B. Voltage
C. Power factor
D. All of the above
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The electrode of a direct arc furnace is made of____________?
A. Tungsten
B. Graphite
C. Silver
D. Copper
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For radiant heating around 2250°C, the heating elements are made of____________?
A. Copper alloy
B. Carbon
C. Tungsten alloy
D. Stainless steel alloy
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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