JE 2019 || Day 33 || Utilization of Electrical Energy Quiz 3 for ESE & GATE EE Exams

Question 1

A factory takes a steady load of 200 kW at a lagging power factor of 0.8. The tariff is Rs. 100 per kVA of maximum demand per annum plus 5 paise per kWh. The phase advancing plant costs Rs. 500 per kVAR and the annual interest and depreciation together amount to 10%. What is the capacity of the phase advancing plant?

Question 2

A factory takes a steady load of 200 kW at a lagging power factor of 0.8. The tariff is Rs. 100 per kVA of maximum demand per annum plus 5 paise per kWh. The phase advancing plant costs Rs. 500 per kVAR and the annual interest and depreciation together amount to 10%. The most economical p.f. is

Question 3

If the percentage reactance of the system upto fault point is 20% and base kVA is 10,000 then short-circuit kVA is

Question 4

A symmetrical fault occurs on a power system. The percentage reactance of the system on 2500 base kVA is 25%. If the full-load current corresponding to base kVA is 20A, then short-circuit current is

Question 5

A 1000 kVA transformer has a reactance of 5%. Its reactance at 2000 kVA base is

Question 6

When a line-to-ground fault occurs, the current in the faulted phase is 100 A. The zero-sequence current this case is

Question 7

Figure shows the single line diagram of a 3-phase transmission line. the percentage reactances of alternator and transformer on 10,000 base kVA are
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Question 8

The positive, negative and zero sequence impedances of 3-phase synchronous generator are j 0.5 pu, j 0.3 pu and j 0.2 pu respectively. When symmetrical fault occurs on the machine terminals. Find the fault current?

Question 9

A symmetrical fault occurs on a power system. The percentage reactance of the system on 2600 base kVA. If the base voltage of 25 kV for the given system then find Fault current is

Question 10

Figure shows the single line diagram of a 3-phase transmission line. The three phase short-circuit fault (i.e. symmetrical fault) will be
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