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In an interconnected system, the diversity factor of the whole system increases.

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Answer : For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

Description : Diversity factor has direct effect on the?

Answer : Diversity factor has direct effect on the fixed cost of unit generated.

Description : What are the advantages of an interconnected system?

Description : The knowledge of diversity factor helps in computing  (1) Plant capacity (2) Average load (3) Units (kWh) generated (4) Peak demand

Answer : The knowledge of diversity factor helps in computing Plant capacity

Description : The following formula is correct:  (A) Diversity factor =1 / Coincidence Factor  (B) Diversity factor =1 x Coincidence Factor  (C) Diversity factor =1 - Coincidence Factor  (D) All of the above

Answer : The following formula is correct:  (A) Diversity factor =1 / Coincidence Factor  (B) Diversity factor =1 x Coincidence Factor  (C) Diversity factor =1 - Coincidence Factor  (D) All of the above

Description : What is the choice of size and number of generator units in interconnected power system?

Answer : Choice of Size and Number of Generating Units: 1. The size/rating and number of generating units in such way that they approximately match with the load curve as closely as possible. 2. In ... , if power plant is connected to grid system then generating unit of higher capacity can be installed.

Description : State any four advantages of interconnected system.

Answer : Advantages of interconnected Systems: i) Reduced Overall installed Capacity: Inter connected power systems reduce the overall requirement of installed capacity for a given load area. With ... to interconnection, there is optimum utilization of available natural resources in the country.

Description : What are interconnected power system?

Answer : Interconnected power systems are those which connect different geographic regions. In Australia we have a National Electricity Grid which connects 6 states. Transfers of power occur between the states depending ... make more profit from this.National-Electricity-Market-Fact-Sheet.pdf (0,9 MB)

Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

Answer : The primary reason for low power factor is supply system is due to installation of induction motors.

Description : The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile

Answer : The benefit of power factor correction in a power system is lower power consumption

Description : A control system having unit damping factor will give  (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response

Answer : 1

Description : The damping factor of a particular system is unity, the system response will be

Answer : The damping factor of a particular system is unity, the system response will be critically damped

Description : Power factor of the system is kept high?

Answer : Power factor of the system is kept high to reduce line losses, to maximise the utilization of the capacities of generators, lines and transformers, to reduce voltage regulation of the line.

Answer : An induction motor has relatively high power factor at near full load.

Description : In order to have a lower cost of electrical energy generation the load factor  (1) and the diversity factor should be low (2) should be low but the diversity factor should be high (3) should be high but the diversity factor should be low (4) and the diversity factor both should be high

Answer : In order to have a lower cost of electrical energy generation the load factor and the diversity factor both should be high

Answer : In two part tariff, variation in load factor will affect operating or running charges.

Answer : For a consumer the most economical power factor is generally 0.95 lagging .

Answer : A low utilization factor for a plant indicates that plant is used for stand by purpose.

Answer : Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.

Answer : Peak load plant can never have 100 percent load factor.

Answer : High load factor indicates total plant capacity is utilised for most of the time.

Answer : Demand factor is defined as maximum demand/connected load.

Answer : The load factor of domestic load is usually 10 to 15%.

Answer : Load factor of a power station is generally less than unity.

Answer : Load factor of a power station is defined as average load/maximum demand.

Description : Can a synchronous condenser improve power factor?

Answer : Yes, synchronous condenser can improve power factor.

Description : What is the maximum value of power factor?

Answer : 1 is the maximum value of power factor.

Description : Give the causes and impact and reasons of grid system fault. 

Answer : Following are the causes/reasons grid system fault: 1. Major imbalance between generation and consumption i.e. demand is more than generation. 2. Low frequency, due to some faults the frequency ... of supply and causes inconvenience to people. 6. Disturb the routine work of common all people.

Description : List and state any four limitations of inter connected power station.

Answer : Limitations of inter connected power station:- 1) Initial cost of infrastructure of transmission line increases as length increases. 2) Interconnection required more automation which increases cost on ... capacity. But in absence of surplus power merits of interconnection cannot be obtain.

Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

Description : In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

Answer : In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

Description : Briefly explain how the power factor of an inductive circuit can be improved.

Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit. 

Description : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Answer : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

Description : Power factor of an electrical circuit is equal to?

Answer : Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.

Description : A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

Answer : A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because stator supply is not required to produce magnetic field.

Answer : The power loss is an important factor for the design of transmission line.

Description : The power factor of an alternator depends on?

Answer : The power factor of an alternator depends on load.

Description : In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) ... by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle

Description : The power factor at resonance in R-L- C parallel circuit is?

Answer : since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.

Description : Capacitors for power factor correction are rated in?

Answer : Capacitors for power factor correction are rated in kVAR.

Answer : In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.

Answer : In a single phase power factor meter the phase difference between the currents in the two pressure coils is exactly 90°.

Answer : In a low power factor wattmeter the compensating coil is connected in series with pressure coil.

Answer : In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.

Description : State the effects of low power factor on efficiency and voltage regulation of short transmission lines. 

Answer : i) Effect of Low power factor on efficiency:- When power factor of load reduces current drawn by transmission line increases so copper losses in transmission line increases, hence transmission ... increases, so voltage drop in transmission line increases so regulation increases. (Become Poor) 

Description : What is the value of capacitance required to improve power factor from 0.7 to 0.9. Given that: Real power = 50 W Vrms of the source = 120 Frequency = 50 Hz   #powerfactor

Description : Define leakage factor.

Answer : It is the ratio of total flux to leakage flux.

Description : Define PIV, TUF, ripple factor, efficiency of rectifier.

Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac

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