| 1. | Surge absorbers protect against oscillations ? | |
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high voltage high frequency
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high voltage low frequency
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low voltage high frequency
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low voltage low frequency
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Report Question| 2. | Which of the following can be used for bus-bars ? | |
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Tubes
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Rods
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Bars
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Any of the above
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| 3. | As compared to cables, the disadvantage of transmission lines is ? | |
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inductive interference between power and communication circuits
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exposure to lightning
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exposure to atmospheric hazards like smoke, ice, etc.
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all of the above
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| 4. | In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than ? | |
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80 km
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150 km
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110 km
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210 km
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| 5. | In case of transmission line conductors with the increase in atmospheric temperature ? | |
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length decreases but stress increases
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length increases but stress decreases
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both the length and stress increase
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both the length and stress decrease
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| 6. | If the height of transmission tower is increased ? | |
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the line capacitance will decrease but line inductance will remain unchanged
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the line capacitance and inductance will not change
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the line capacitance will increase but line inductance will decrease
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the line capacitance will decrease and Line inductance will increase
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| 7. | Which of the following distribution systems is the most economical ? | |
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A.C. 1-phase system
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A.C. 3-phase 3 wire system
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A.C. 3-phase 4 wire system
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Direct current system
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| 8. | Electro-mechanical voltage regulators are generally used in ? | |
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reactors
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generators
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transformers
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all of the above
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| 9. | The frequency of voltage generated, in case of generators, can be increased by ? | |
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using reactors
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increasing the load
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adjusting the governor
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reducing the terminal voltage
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| 10. | The effect of corona can be detected by ? | |
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presence of zone detected by odour
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hissing sound
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faint luminous glow of bluish colour
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all of the above
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