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Chapter 3.1 - Electrical Systems

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Question bank for Energy Managers & Energy Auditors Chapter 3.1: Electrical System Part-I: Objective type Questions and Answers 1. The heat input required for generating one kilo watt-hour of electrical output is called as ___. a) Efficiency 2. b) 11 kV b) 9 c) 36 times c) 3 c) 3300 kVA d) 600 kVA b) Load curve c) Demand curve d) Energy curve The vector sum of active power and reactive power required is ____. b) Power Factor c) Load Factor d) Maximum Demand Power factor is the ratio of ____ and apparent power. c) Load Factor d) Maximum Demand The kVAr rating required for improving the power factor of a load operating at 500 kW and 0.85 power factor to 0.95 is ________. a) 145 kVAr 11. d) 1/36 times d) None b) 3000 kVA a) Active power b) Reactive power 10. d) All Presenting the load demand of a consumer against time of the day is known as___. a) Apparent Power 9. c) Length of the line The maximum demand of an industry, if trivector meter records 3600 KVA for 15 minutes and 3000 kVA for next 15 minutes over a recording cycle of 30 minutes is_____. a) Time Curve 8. b) Resistance of the line b) 1/6 times a) 3600 kVA 7. d) 433 V If the distribution voltage is raised from 11 kV to 33 kV, the line loss would be lower by a factor: a) 1/9 6. c) 280 V If distribution of power is raised from 11 kV to 66 kV, the voltage drop would lower by a factor a) 6 times 5. d) Heat value The power loss in transmission/distribution line depends on ____. a) Current in the line 4. c) Calorific Value Which of the voltage is not available for Indian distribution system? a) 33 kV 3. b) Heat Rate b) 500 kVAr c) 50 kVAr d) 100 kVAr The rating of the capacitor at motor terminals should not be greater than _____ . a) magnetizing kVAr of the motor at full load c) magnetizing kVAr of the motor at half load 12. b) magnetizing kVAr of the motor at no load d) magnetizing kVAr of the motor at 75% load The percentage reduction in distribution loses when tail end power factor raised from 0.8 to 0.95 is ________. a) 29% 13. c) 71% d) 84% If voltage applied to a 415 V rated capacitors drops by 10%, its VAR output drops by ____. a) 23% 14. b) 15.8% b) 87% c) 19% d) 10% The ratio between the number of turns on the secondary to the turns on the primary of a transformer is know as: a) turns ratio b) efficiency 3.1 Electrical system - revised (table format) c) winding factor d) power factor 1

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