| 1. | If the efficiency of a machine is to be high, what should be low ? | |
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Input power
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Losses
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True component of power
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kWh consumed
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Report Question| 2. | The thickness of insulation provided on the conductor depends on ? | |
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the magnitude of voltage on the conductor
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the magnitude of current flowing through it
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both (a) and (b)
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none of the above
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| 3. | A 500 W, 220 V bulb is supplied with 110 V. Power consumption by the bulb will be ? | |
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slightly less than 125W
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slightly greater than 125W
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exactly 125 W
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250W
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| 4. | Two bulbs of 600 Wand 200 W rated at 250 V will have resistance ratio as ? | |
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4 : 25
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25 : 4
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2 : 5
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5 : 2
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| 5. | Which of the following statement is correct ? | |
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A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
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A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
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A semi-conductor is one which conducts only half of the applied voltage
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A semi-conductor is a material made of alternate layers of conducting material and insulator
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| 6. | Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ? | |
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3/2 ?
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6 ?
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4 ?
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8/3 ?
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| 7. | The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ? | |
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18?
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36?
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48?
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64?
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| 8. | The maximum current rating for a 10 k?, 0.5 W resistor is ? | |
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0.707 mA
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7.07 mA
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14.14 mA
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28.28 mA
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| 9. | An electrical lamp consumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is ? | |
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0.006 kWh
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0.05 kWh
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0.5 kWh
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5 kWh
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| 10. | One commercial unit of energy equals ? | |
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600 watt-seconds
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One watt-hour
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One kilowatt-hour
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ten kilowatt-hour
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