choose the correct answer 1. The maximum break down strength of air at 76 cm mercury pressure and temperature of 25 ºC is a. 30 V/cm b. 30 kV/cm c. 300 kV/cm 2. The installed capacity of a power station must be not.... a. Less b. equal c. more 3. Area under the daily load curve divided by 24 hour gives daily d. Non of them than the maximum demand. d. Non of them ......... .... a. average load in kW. b. maximum demand in kW. c. units generated in kwh. d. Non of them 4. In thermal power station, 5 kwh need to burn fuel has. a. 860 k.calorific. b. 1500 k.calorific c. 4300 k.calorific d. Non of them. 5. Francis and Kaplan turbines are used for .. heads. a. medium and high b. medium and low c. medium only. 6. For photo voltage cell, Fill factor is d. High only a. Vmpimp Uscise b. Vscisc Vmpimp c. Vmpimp d. Vscisc 7. Power available from wind mill is ვ. PA V² 1 b. -A V² 20 c. PA V³ d. pA V³

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A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?

I need help from an expert on how to draw a load curve, as there are two periods A and B with different loads and times. I need a detailed explanation of this process because it is difficult. Q1. A generation station of 3 MW supply a two regions A & B The line losses are neglected and the load variation of these regions is as follow: Region A (Time) From midnight to 5 a.m No-load From 8 a.m to From 5 am to Load (kw) 8 a.m 1200 11 a.m 800 Region B From From From (Time) midnight to 6 a.m to p.m to Load (kw) 6 a.m 400 3 p.m 7 p.m 900 No-load 1-Plot The daily load curve of the total system. From 11 a.m to 6p.m No-load From From 6 p.m to midnight 600 From 7 p.m to 9 p.m to 9 p.m midnight 1800 200

A generator operating at 50 Hz delivers 1 p.u. power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 p.u. Where as before the fault, this power was 2.5 p.u. and after the clearance of the fault, it is 2 p.u. The value of 8 is max

What is the purpose of power factor correction to a given load? O To reduce the amount of voltage to the load. O To reduce the amount of dependence on automated machinery. O To reduce the amount of current to the load. O To reduce the amount of resistance of the load.

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Q4/For the three-phase power network shown in Figure. the various components are: GI: 100 MVA, 0.30 pu reactance. G2: 60 MVA, 0.18 pu reactance. Transformers (cach): 50 MVA, 0.10 pu reactance. Inductive reactor X: 0.20 pu on a base of 100 MVA. Lines (each): 80 ohms (reactive); neglect resistance. with the network initially unloaded and a line voltage of 110 kV, a symmetrical short circuit occurs at midpoint E of line 2. Calculate the short circuit MVA to be interrupted by the circuit breakers A and B at the ends of the line. T3 38 L1 L2 G2 Bas 12 T4 Bus

Q4. The source current in the circuit shown is in Figure 3a) What impedance should be connected across terminals a,b for maximum average powertransfer?b) What is the average power transferred to the impedance in (a)?c) Assume that the load is restricted to pure resistance. What size resistor connected across a,bwill result in the maximum average power transferred?d) What is the average power transferred to the resistor in (c)?v

A 500 kVA, 1100 V, 50 hz, wye-connected 3-phasehas armature resistance of 0.1 02/phase and synchronous reactance/phase of 1.502. (i) What is voltage regulation if the load pf is 0.9 lagging ? (ii) what is voltage regulation if the load pf is 0.8 leading?