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in Lesson 2 Generation, Transmission and Distribution of Electric Power an Overview by
Give some typical value of generated voltage in a power station. Why is it necessary to step up the voltage further before transmitting?

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What is the most effective way to reduce the cost of power generation in a power station?  (A) By increasing the diversity factor and decreasing the load factor (B) By increasing both the diversity factor and the load factor (C) By decreasing both the diversity factor and the load factor (D) By decreasing the diversity factor and increasing the load factor 

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A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = _:  (1) Zero (2) Infinity (3) L/R (4) R/L 

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 To turn a conducting SCR to off state, it is necessary to make : -  a) anode current less than holding current b)gate current zero  c) anode voltage less than break over voltage  d) gate voltage zero

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The typical ratio of latching current to holding current in a 20A thyristor is : (A) 5.0 (B) 2.0 (C) 1.0 (D) 0.5

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At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of service, the load power factor becomes (A) 0.85 (B) 1.00 (C) 0.80 lag (D) 0.90 lag

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The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : -  a) 5V/µs b) 2.5 V/ µs c) 3V/µs d) 4.5V/ µs

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A power station supplies the peak load of 60 Mw, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55. The maximum demand on the station and average load respectively will be 

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A 1:5 step-up transformer has 120V across the primary and 600 ohms resistance across the secondary. Assuming 100% efficiency, the primary current will be:  (A) 0.2 Amp. (B) 5 Amps. (C)10 Amps. (D) 20 Amps

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Typical value of SCR for modern turbo alternator is (1) 1 (2) 1.2 (3) 0.5 (4) 1.5 

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In a power station, the cost of generation of power reduces when (A) diversity factor alone increases (B) both diversity factor and load factor increase. (C) load factor alone increases. (D) both diversity factor and load factor decrease,

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In a series RLC circuit, the rms value of voltage across the resistor is 30 V, across the inductor is 60 V and across the capacitor is 20 V. The rms supply voltage would be (A) 110 V (B) 10 V (C) 220 V (D) 50 V

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If a self excited d.c. generator after being installed, fails to build up voltage on its first trial run, the first thing to do is (a) reverse the field winding connections (b) increase the field resistance (c) decrease the speed of prime mover (d) increase the speed of prime mover  

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