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Chapter 3.9 - Diesel Generating System

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Question bank for Energy Managers & Energy Auditors Chapter 3.9: DG Sets Part-I: Objective type questions and answers 1. The compression ratio in diesel engines is in the range of: a) 10:1 to 15:1 2. b) 14:1 to 25:1 b) Maximum load b) 100 g/kWh b) 5 6% c) 10 - 12% d)Above 15% b) 600 kVA c) 625 kVA d) 500 kVA b) 200 c) 150 d) 300 b) 15% c) 10% d) 1% The permissible percentage overload on DG sets for 1 hour in every 12 hours of operation is____ b) 15% c) 10% d) 1% Designed power factor of a DG set is generally at: a) 1.0 12. d) Above 80% The maximum permissible percentage unbalance in phase loads on DG sets is____ a) 5% 11. c) 65 70% The starting current value of DG set should not exceed__% of full load capacity of DG set. a) 5% 10. d) 50 g/kWh The rating required for a DG set with 500 kW connected load and with diversity factor of 1.5, 80% loading and 0.8 power factor is _____ a) 100 9. d) Zero load Auxiliary power consumption of DG set at full load in its operating capacity is about _____. a) 520 kVA 8. c) 160 g/kWh b) 50 60% a) 1 - 2% 7. c) Partial load The efficiency of diesel generating set falls in the region of: a) 35 45% 6. b) 0.8 c) 0.9 d) 1.1 Lower power factor of a DG set demands_____ a) Lower excitation currents b) Higher excitation currents c) No change in excitation currents 13. d) None of the above Which of the following losses is the least in DG sets: a) cooling water loss b) exhaust loss c) frictional loss 14. d) Exhaust stroke Present specific fuel consumption value of DG sets in industries is about ____. a) 220 g/kWh 5. b) Compression stroke c) Ignition stroke The power requirement of the DG set is determined by: a) base load 4. d) 1:2 to 3:1 Which of the following is the last step in diesel engine operation? a) Induction stoke 3. c) 5:1 to 10:1 d) alternator loss The waste heat potential for a 1100 kVA set at 800 kW loading and with 480 C exhaust gas temperature is ____ a) 4.8 lakh kCal/hr b) 3.5 lakh kCal/hr 3.9 DG sets - revised (table format) c) 3 lakh kCal/hr d) 2 lakh kCal/hr 65

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