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What is the maximum value of power factor?
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is the maximum value of power factor.

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

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Define : i) Maximum Value ii) RMS Value of ac supply

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i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value.  ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time. 

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In a power plant if the maximum demand on the plant is equal to the plant capacity, then plant reserve capacity will be zero.

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Maximum demand on a power plant is the greatest of all "short time interval averaged" demand during a period.

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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

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

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

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

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

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

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

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Can a synchronous condenser improve power factor?

Answer :

Yes, synchronous condenser can improve power factor.

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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

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

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What is the value of Beta in power BJT?

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The beta value in power BJT is 5 to 10.

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Maximum Power Transfer Theorem 1

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Maximum Power Transfer Theorem 1

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State maximum power transfer theorem for DC circuit.

Answer :

Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

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 An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS 

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 An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when ZL = R-jXS

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A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300o C, then the maximum allowable power dissipation in the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W

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A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of  ... 300o C, then the maximum allowable power dissipation in the device will be 2.00 W 

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The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

Answer :

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is 0.5 pu

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For maximum transfer of power, internal resistance of the source should be?

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For maximum transfer of power, internal resistance of the source should be equal to load resistance.

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"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with?

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"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with Maximum power transfer theorem.

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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

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The maximum load that a power transformer can carry is limited by its?

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The maximum load that a power transformer can carry is limited by its voltage ratio.

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The synchronous motor will develop maximum power when the load angle is?

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The synchronous motor will develop maximum power when the load angle is 900.

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The value of starting capacitor of a fractional horse power motor will be 300 uF .

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What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Answer :

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

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What is the power factor of purely resistive circuit.

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Unity that is 1

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What is the use of power factor correction?

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What is the best power factor?

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It is unity power factor but difficult to achieve in dynamic loads

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What is power factor angle?

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What is the advantage of high power factor?

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Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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

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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) 

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

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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. 

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Why capacitors are used to improve power factor?

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 Capacitors generate reactive power instead of that drawn from source which is required by inductive loads.so it reduce the reactive current which is drawn from source to be drawn from capacitor.This control in Electric bills cost.

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Discuss how power factor tariff results into energy conservation.

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Power factor tariff results into energy conservation: i) Applying incentives and penalties according to power factor is an effective way, which enables consumer to improve power factor so that he can ... finally leads to reduction in the current drawn by the load and helps for energy conservation.

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Draw and explain bulk correction method for power factor & control.

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Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95). 

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State the incentives and penalties related with power factor tariff.

Answer :

Incentives and penalties related with power factor tariff: In addition to basic tariff (Maximum Demand Tariff / KVA Maximum Demand Tariff / Load factor tariff) the tariff in which P.F. of ... industrial consumer/H.T/ commercial consumers with contract demand above 80 kw/ 100Kva/107 hp consumer.

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With a neat sketch explain working of 1 phase dynamometer type power factor meter.

Answer :

Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

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State the significance of power factor.

Answer :

Significance of power factor:-  1. Cosine of angle between voltage & current in a circuit is called power factor. 2. It is a measure of the real power in a circuit. 3. Inductive & ... KVA rating equipment 5. Greater conductor size 6. CosØ = R/Z  CosØ= Active Power/ Apparent Power 

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

Answer :

Leading

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The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

Answer :

The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

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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) excitation emf leads the terminal voltage 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

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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

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The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu, 0.866 pu (B) 0.866 pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu

Answer :

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are 0.866 pu, 0.5 pu

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The power factor of a D.C. circuit is always?

Answer :

The power factor of a D.C. circuit is always unity.

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The ratio of active power to apparent power is known as____ factor.

Answer :

The ratio of active power to apparent power is known as power factor.

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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.

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