Last Answer : More than 100%
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158 views
2 answers
asked
Mar 20, 2018
by
anonymous
Last 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.
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169 views
1 answer
asked
Mar 20, 2018
by
anonymous
Define : i) Maximum Value ii) RMS Value of ac supply
Last Answer : 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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86 views
1 answer
asked
Aug 17, 2019
by
anonymous
Last Answer : 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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277 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Maximum demand on a power plant is the greatest of all "short time interval averaged" demand during a period.
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98 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : An induction motor has relatively high power factor at near full load.
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92 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.
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185 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : For a consumer the most economical power factor is generally 0.95 lagging .
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209 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The primary reason for low power factor is supply system is due to installation of induction motors.
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115 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Load factor of a power station is generally less than unity.
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107 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : Load factor of a power station is defined as average load/maximum demand.
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321 views
1 answer
asked
Mar 20, 2018
by
anonymous
Can a synchronous condenser improve power factor?
Last Answer : Yes, synchronous condenser can improve power factor.
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90 views
1 answer
asked
Mar 19, 2018
by
anonymous
Maximum Power Transfer Theorem 1
Last Answer : Maximum Power Transfer Theorem 1
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94 views
1 answer
asked
May 22, 2019
by
anonymous
State maximum power transfer theorem for DC circuit.
Last 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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111 views
1 answer
asked
Sep 6, 2018
by
anonymous
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
Last Answer : 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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4.0k views
1 answer
asked
Jun 18, 2018
by
anonymous
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 ... the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W
Last Answer : 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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148 views
1 answer
asked
Jun 18, 2018
by
anonymous
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
Last 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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98 views
1 answer
asked
Apr 28, 2018
by
anonymous
For maximum transfer of power, internal resistance of the source should be?
Last Answer : For maximum transfer of power, internal resistance of the source should be equal to load resistance.
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371 views
1 answer
asked
Mar 25, 2018
by
anonymous
"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?
Last Answer : "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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397 views
1 answer
asked
Mar 25, 2018
by
anonymous
Last Answer : (b) Clostridium butylicum Lipase Removal of oil stains
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107 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : 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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324 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : 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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367 views
1 answer
asked
Mar 20, 2018
by
anonymous
The maximum load that a power transformer can carry is limited by its?
Last Answer : The maximum load that a power transformer can carry is limited by its voltage ratio.
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133 views
1 answer
asked
Mar 19, 2018
by
anonymous
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The synchronous motor will develop maximum power when the load angle is?
Last Answer : The synchronous motor will develop maximum power when the load angle is 900.
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226 views
1 answer
asked
Mar 18, 2018
by
anonymous
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
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148 views
1 answer
asked
Apr 29, 2018
by
anonymous
Last Answer : The value of starting capacitor of a fractional horse power motor will be 300 uF .
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98 views
1 answer
asked
Mar 20, 2018
by
anonymous
What is the value of Beta in power BJT?
Last Answer : The beta value in power BJT is 5 to 10.
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105 views
1 answer
asked
Sep 20, 2017
by
anonymous
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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197 views
0 answers
asked
May 17, 2020
by
anonymous
What is meant by Power factor?
Last Answer : Ans. Power factor means ratio of true power to apparent power. It is cosine of phase angle between voltage and current. Its value is 1 for Unity P.F. Loads, 0 to 1 lagging for inductive loads and o to 1 leading for capacitive loads.
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17 views
1 answer
State the effects of low power factor on efficiency and voltage regulation of short transmission lines.
Last 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)
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359 views
1 answer
asked
May 22, 2020
by
anonymous
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.
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183 views
1 answer
asked
May 17, 2020
by
anonymous
Why capacitors are used to improve power factor?
Last Answer : 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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183 views
3 answers
asked
Aug 18, 2019
by
anonymous
Discuss how power factor tariff results into energy conservation.
Last Answer : 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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2.6k views
1 answer
asked
Sep 29, 2018
by
anonymous
Draw and explain bulk correction method for power factor & control.
Last Answer : 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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113 views
1 answer
asked
Sep 29, 2018
by
anonymous
State the incentives and penalties related with power factor tariff.
Last 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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142 views
1 answer
asked
Sep 22, 2018
by
anonymous
With a neat sketch explain working of 1 phase dynamometer type power factor meter.
Last 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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202 views
1 answer
asked
Sep 6, 2018
by
anonymous
State the significance of power factor.
Last 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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57 views
1 answer
asked
Sep 6, 2018
by
anonymous
A transformer has negative voltage regulation when its load power factor is (1) Zero (2) Unity (3) Leading (4) Lagging
Last Answer : 0
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5.1k views
3 answers
asked
Apr 30, 2018
by
anonymous
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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)
Last 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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167 views
1 answer
asked
Apr 30, 2018
by
anonymous
.jpg)
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
Last Answer : In a synchronous generator delivering lagging power factor load the excitation emf leads terminal voltage by the power angle
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340 views
1 answer
asked
Apr 29, 2018
by
anonymous
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
Last 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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209 views
1 answer
asked
Apr 29, 2018
by
anonymous
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
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104 views
1 answer
asked
Apr 28, 2018
by
anonymous
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 ... pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu
Last 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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98 views
1 answer
asked
Apr 28, 2018
by
anonymous
The power factor of a D.C. circuit is always?
Last Answer : The power factor of a D.C. circuit is always unity.
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219 views
1 answer
asked
Mar 25, 2018
by
anonymous
The ratio of active power to apparent power is known as____ factor.
Last Answer : The ratio of active power to apparent power is known as power factor.
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927 views
1 answer
asked
Mar 25, 2018
by
anonymous
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?
Last 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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467 views
1 answer
asked
Mar 25, 2018
by
anonymous
.jpg)
Power factor of electric bulb is?
Last Answer : Power factor of electric bulb is unity.
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93 views
1 answer
asked
Mar 25, 2018
by
anonymous
The power factor at resonance in R-L- C parallel circuit is?
Last 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.
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975 views
2 answers
asked
Mar 25, 2018
by
anonymous
Power factor of the system is kept high?
Last 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.
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144 views
1 answer
asked
Mar 25, 2018
by
anonymous
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.
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278 views
1 answer
asked
Mar 25, 2018
by
anonymous
