Economics of Power Generation

81. The primary reason for low power factor is supply system is due to installation of

1. induction motors
2. synchronous motors
3. single phase motors
4. d.c. motors

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82. When the demand of consumers is not met by a power plant, it will resort to which of the following?

1. Load shedding
2. Power factor improvement at the , generators
3. Penalising high load consumers by increasing the charges for electricity
4. Efficient plant operation

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83. Which lightening stroke is most dangerous?

1. Direct stroke on line conductor
2. Indirect stroke on conductor
3. Direct stroke on tower top
4. Direct stroke on ground wire

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84. Which of the following are not repayable after a stipulated period?

1. Shares
2. Fixed deposits
3. Cash certificates
4. Bonds

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85. Which of the following component, in a steam power plant, needs maximum maintenance attention?

1. Steam turbine
2. Condenser
3. Water treatment plant
4. Boiler

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86. Which of the following devices may be used to provide protection against lightening over voltages?

1. Horn gaps
2. Rod gaps
3. Surge absorbers
4. All of the above

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87. Which of the following equipment provides fluctuating load?

1. Exhaust fan
2. Lathe machine
3. Welding transformer
4. All of the above

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88. Which of the following generating station has minimum ruiyiing cost?

1. Nuclear
2. Hydro
3. Thermal
4. Diesel

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89. Which of the following is an advantage of static capacitor for power factor improvement?

1. Little maintenance cost
2. Ease in installation
3. Low losses
4. All of the above

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90. Which of the following is not a method for estimating depreciation charges?

1. Sinking fund method
2. Straight line method
3. Diminishing value method
4. Halsey’s 50—50 formula

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