The steady state stability of the power system can be improved by

The steady state stability of the power system can be improved by

(A) using machines of high impedance

(B) connecting transmission lines in series.

(C) connecting lines in parallel.

(D) reducing, the excitation of the machines.
by

1 Answer

Answer :

The steady state stability of the power system can be improved by connecting lines in parallel.

by

Related questions

steady-state stability of a power system is improved by

Description : steady-state stability of a power system is improved by

Last Answer : steady-state stability of a power system is improved by using double circuit line instead of single circuit line

The steady state stability limit as compared to the transient state stability limit is always

Description : The steady state stability limit as compared to the transient state stability limit is always

Last Answer : The steady state stability limit as compared to the transient state stability limit is always Greater

The steady state stability of the power system can be increased by?

Last Answer : The steady state stability of the power system can be increased by connecting lines in parallel.

A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission

Description : A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the infinite bus voltage is 1 pu. The ... fault at the generator terminal is  (A) 53.5 (B) 60.2 (C) 70.8 (D) 79.6

Last Answer : A cylinder rotor generator delivers 0.5 pu power in the steady-state to an infinite bus through a transmission line of reactance 0.5 pu. The generator no-load voltage is 1.5 pu and the ... clearing angle, in degrees, for a three-phase dead short circuit fault at the generator terminal is 79.6

The stability of the power system is not affected by

Description : The stability of the power system is not affected by  (1) generator reactance (2) line reactance (3) line losses (4) output torque

Last Answer : The stability of the power system is not affected by line losses

What is steady state state stability limit?

Description : What is steady state state stability limit?

Last Answer : The steady state stability limit is the max. power that can be transferred by a machine toa receving system without loss of synchronism.

Which of the following statements is true? steady-state stability limit is greater than transient stability limit

Description : Which of the following statements is true?  (1) steady-state stability limit is greater than transient stability limit  (2) steady-state stability limit is equal to transient stability ... made regarding the equality or otherwise of the steady-state stability limit and transient stability limit

Last Answer : Which of the following statements is true?  (1) steady-state stability limit is greater than transient stability limit  (2) steady-state stability limit is equal to transient ... made regarding the equality or otherwise of the steady-state stability limit and transient stability limit

A 10 kVA, 400 V/200 V single phase transformer with 10% impedance draws a steady

Description : A 10 kVA, 400 V/200 V single phase transformer with 10% impedance draws a steady short-circuit line current of   (a) 250A (b) 50 A (c) 150 A (d) 350 A 

Last Answer : A 10 kVA, 400 V/200 V single phase transformer with 10% impedance draws a steady short-circuit line current of 250A

The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to

Description : The 'Equal area criterion' for the determination of transient stability of a synchronous machine connected to an infinite bus  (1) ignores line as well as synchronous machine resistance ... consideration the possibility of machine losing synchronism after it has survived during the first swing.

Last Answer : 1

Transient stability can be improved by a) By putting series capacitor b) By using dynamic resister c) Auto re-closers d) All of the above

Description : Transient stability can be improved by a) By putting series capacitor b) By using dynamic resister c) Auto re-closers d) All of the above

Last Answer : Ans: All of the above

For the upstream face of an earthen dam, the most adverse condition for stability of slope is (A) Sudden drawdown (B) Steady seepage (C) During construction (D) Sloughing of slope

Description : For the upstream face of an earthen dam, the most adverse condition for stability of slope is (A) Sudden drawdown (B) Steady seepage (C) During construction (D) Sloughing of slope

Last Answer : Answer: Option A

A power system is subjected to a fault which makes the zero sequence component of current equal to zero

Description :  A power system is subjected to a fault which makes the zero sequence component of current equal to zero. The nature of fault current is: A) Double line to ground fault B) Line to line fault C) Line to ground fault D) Three-phase to ground fault

Last Answer :  A power system is subjected to a fault which makes the zero sequence component of current equal to zero. The nature of fault current is: Line to line fault

If the reference bus is changed in two load flow runs with same system data and power obtained for

Description : If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the latter run, the system losses  A) Will be ... C) As well as complex bus voltage will changed D) As well as complex bus voltage will be unchanged

Last Answer : If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken as specified P and Q in the latter run, the system losses Will be unchanged but complex bus voltages will change

The rated voltage of a 3-phase power system is given as

Description : The rated voltage of a 3-phase power system is given as  A) rms phase voltage B) Peak phase voltage C) rms line to line voltage D) Peak line to line voltage

Last Answer : The rated voltage of a 3-phase power system is given as rms line to line voltage

Generally in a power system network, the load is represented as a :

Description : Generally in a power system network, the load is represented as a :  (A) Constant power in both load flow study and in stability study  (B) Constant power in load flow study and constant ... impedance in load flow study  (D) Constant impedance in both load flow study and in stability study

Last Answer : Generally in a power system network, the load is represented as a : Constant power in load flow study and constant impedance in stability study 

The benefit of power factor correction in a power system is

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

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

If non-linear loads are connected to the power system, then

Description : If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power ... factor is due to harmonic currents (D) total power factor is due to fundamental component of current

Last Answer : If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

With fault clearing time, the transient stability of a power system

Description : With fault clearing time, the transient stability of a power system

Last Answer : With fault clearing time, the transient stability of a power system decreases

Transient stability studies of a power system are usually carried out over a time period of

Description : Transient stability studies of a power system are usually carried out over a time period of (A) two or more seconds (B) several time swings (C) time interval of first swing (D) sustained oscillations

Last Answer : Transient stability studies of a power system are usually carried out over a time period of several time swings

It is always economical to improve the power factor of an electric installation to

Description : It is always economical to improve the power factor of an electric installation to (a) zero (b) unity (c) a little less than unity (d) a little more than unity 

Last Answer : To  a  little  less  than  unity.

A 3-phase 11 kV generator feeds power to a constant power unity power factor load of 100 MW through a

Description : A 3-phase 11 kV generator feeds power to a constant power unity power factor load of 100 MW through a 3-phase transmission line. The line-to line voltage at the terminals of the machine is maintained constant at 11 kV. The per ... 11 kV is  (A) 100 MVAR (B) 10.1 MVAR (C) -100 MVAR (D) -10.1 MVAR

Last Answer : A 3-phase 11 kV generator feeds power to a constant power unity power factor load of 100 MW through a 3-phase transmission line. The line-to line voltage at the terminals of the machine is maintained ... load to increase the line-to-line voltage at the load terminals to 11 kV is -10.1 MVAR

A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor.

Description : A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor. Suddenly a fault occurs reducing in electric power output by 40%. Neglect losses and assume constant power input to the ... the time of fault will be  (A) 1.528 (B) 1.018 (C) 0.848 (D) 0.509

Last Answer : A 50 Hz, 4-pole, 500 MVA, 22 kV turbo-generator is delivering rated megavolt amperes at 0.8 power factor. Suddenly a fault occurs reducing in electric power output by 40%. Neglect losses and assume ... the shaft. The accelerating torque in the generator in MNm at the time of fault will be 1.018 

In the thermal power plants, the pressure in the working fluid cycle is developed by

Description : In the thermal power plants, the pressure in the working fluid cycle is developed by  (A) condenser (B) super heater (C) feed water pump (D) turbine

Last Answer : In the thermal power plants, the pressure in the working fluid cycle is developed by feed water pump 

At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power

Description : 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

Last Answer : 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  0.80 lag

An 800 kV transmission line has a maximum power transfer capacity of P. If it is operated at 400 kV with the

Description : An 800 kV transmission line has a maximum power transfer capacity of P. If it is operated at 400 kV with the series reactance unchanged, the new maximum power transfer capacity is approximately (A) P (B) 2P (C) P / 2 (D) P / 4

Last Answer : An 800 kV transmission line has a maximum power transfer capacity of P. If it is operated at 400 kV with the series reactance unchanged, the new maximum power transfer capacity is approximately P / 4

For enhancing the power transmission in along EHV transmission line, the most preferred method is to

Description : For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a  (A) Series inductive compensator in the line (B) Shunt inductive compensator at the ... (C) Series capacitive compensator in the line (D) Shunt capacitive compensator at the sending end

Last Answer : For enhancing the power transmission in along EHV transmission line, the most preferred method is to connect a Series capacitive compensator in the line

For a fixed value of complex power flow in a transmission line having a sending and voltage V, the real

Description : For a fixed value of complex power flow in a transmission line having a sending and voltage V, the real power loss will be proportional to  A) V B) v2 C) 1/V2 D)1/V

Last Answer : For a fixed value of complex power flow in a transmission line having a sending and voltage V, the real power loss will be proportional to 1/V2

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Description : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Last Answer : For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when The incremental fuel cost of each plant multiplied by the penalty factor is the same

An _____________is a network of electrical components used to supply, transfer and use electric power:

Description : An _____________is a network of electrical components used to supply, transfer and use electric power:  (A) Electric power system (B) Electric power (C) All of the above (D) None of the above

Last Answer : An Electric power system is a network of electrical components used to supply, transfer and use electric power.

A transformer has negative voltage regulation when its load power factor is

Description : A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

Last Answer : 0

The capital cost of a power plant depends on

Description : The capital cost of a power plant depends on  (1) Total installed capacity only. (2) Total number of units only. (3) Total installed capacity and number of units as well. (4) Neither the installed capacity nor number of units

Last Answer : The capital cost of a power plant depends on Total installed capacity and number of units as well.

Load compensation in power systems is a process to :

Description : Load compensation in power systems is a process to :  (A) Maintain better voltage profile (B) Increase short circuit capacity of the system (C) Generate required harmonics for loads like arc furnaces (D) Compensate for the line reactance

Last Answer : Load compensation in power systems is a process to : Maintain better voltage profile

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW

Description : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is  (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh

Last Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh

The storage battery generally used in electric power stations is

Description : The storage battery generally used in electric power stations is  (1) zinc carbon battery (2) lead acid battery (3) nickel cadmium battery (4) lithium -ion battery

Last Answer : The storage battery generally used in electric power stations is lead acid battery 

A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals

Description : A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, acceleration of the generator rotor is

Last Answer : A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance ... , acceleration of the generator rotor is inversely proportional to the moment of inertia of the machine

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Last Answer : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

The power flow problem mathematical model for a linear transmission network

Description : The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

Last Answer : The power flow problem mathematical model for a linear transmission network is non-linear

The transmission line feeding power on either side of the main transmission line is called?

Description : The transmission line feeding power on either side of the main transmission line is called?

Last Answer : The transmission line feeding power on either side of the main transmission line is called Secondary transmission.

For a transmission line with negligible losses, the lagging reactive power...

Description : For a transmission line with negligible losses, the lagging reactive power (VAR) delivered at The receiving end, for a given receiving end voltage, is directly proportional to the?

Last Answer : For a transmission line with negligible losses, the lagging reactive power (VAR) delivered at The receiving end, for a given receiving end voltage, is directly proportional to the line voltage drop.

A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. ...

Description : A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance perphase of the capacitor in micro-farads is?

Last Answer : A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance perphase of the capacitor in micro-farads is 1.316.

A power station supplies the peak load of 60 Mw, 40 MW and 70 MW to three localities...

Description : 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 

Last Answer : 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 103.2 MW, 51.61 .

The yearly load duration curve of a power plant is a straight line...

Description : The yearly load duration curve of a power plant is a straight line. The maximum load is 750 MW and the minimum load is 600 Mw. The capacity of the plant is 900 MW. What is the capacity factor and utilization factor? 

Last Answer : 0.75, 0.83 is the capacity factor and utilization factor.

Mention the disadvantages of low power factor? How can it be improved?

Description : Mention the disadvantages of low power factor? How can it be improved?

Last Answer : Disadvantages of low power factor: Line losses are 1.57 times unity power factor. Larger generators and transformers are required. Low lagging power factor causes a large voltage drop, hence ... will have to carry more current at low power factor. This requires a large conductor size.

Mechanisation in india at various levels can be done in following ways… a) by introducing the improved agricultural implements on small scale holding to be operated by bullocks. b) by using small tractors, tractor drawn machines and power tillers on medium holdings to supplement source. c) by using large scale tractor and machines on remaining holding to supplement animal power source. d) All of the above

Description : Mechanisation in india at various levels can be done in following ways a) by introducing the improved agricultural implements on small scale holding to be operated by bullocks. b) by using small ... tractor and machines on remaining holding to supplement animal power source. d) All of the above

Last Answer : All of the above

In an induction machine, if the air gap increased a) Speed will be reduced b) Efficiency will be improved c) Power factor will be lowered d) Breakdown torque will be reduced

Description : In an induction machine, if the air gap increased a) Speed will be reduced b) Efficiency will be improved c) Power factor will be lowered d) Breakdown torque will be reduced

Last Answer : Ans: Power factor will be lowered

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

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

Last 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. 

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

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

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

Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is important in problems involving gas absorption without chemical reaction (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion (D) Total reflux in case of distillation operation requires infinite number of plates for a binary system separation

Description : Pick out the correct statement. (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas (B) The 'Hatta number' is ... reflux in case of distillation operation requires infinite number of plates for a binary system separation

Last Answer : (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion