Description : What will happen when power factor is leading in distribution of power?
Last Answer : If there is high power factor, i.e. if the power factor is close to one: 1. Losses in form of heat will be reduced, 2. Cable becomes less bulky and easy to carry, and very cheap to afford, & 3. It also reduces over heating of transformers.
Last Answer : A:If their is high power factor, i.e if the power factor is close to one: 1.losses in form of heat will be reduced, 2.cable becomes less bulky and easy to carry, and very cheap to afford, & 3. it also reduces over heating of transformers.
Last Answer : If there is high power factor, i.e if the power factor is close to one: Losses in form of heat will be reduced, Cable becomes less bulky and easy to carry, and very cheap to afford. It also reduces over heating of transformers.
Description : A transformer has negative voltage regulation when its load power factor is- (a) Zero (b) Unity (c) Leading (d) Lagging
Last Answer : Ans: C
Description : If the excitation of an alternator operating in parallel is decreased below normal, its _____________. A. power factor will change in the lagging direction B. power factor will change in the leading direction C. ampere load will be greatly increased D. kilowatt load will be greatly decreased
Last Answer : Answer: B
Description : When voltage and current developed in an AC circuit reach their peak values at the same time, the power factor is _____________. A. lagging B. leading C. maximum D. minimum
Last Answer : Answer: C
Description : When the voltage and the current developed in an AC circuit reach their peak values at the same time, the power factor is considered to be _____________. A. lagging B. leading C. unity D. infinity
Description : If the excitation is increased to one of two alternators operating in parallel, the _____________. A. power factor will change in the lagging direction B. power factor will change in the leading direction C. kilowatt load will be greatly increased D. ampere load will be greatly decreased
Last Answer : Answer: A
Description : Which of the following statements is true concerning all three-phase alternators? A. Each has three separate but identical armature windings acted on by one system of rotating magnets. B. Each has one ... The three phases always provide power to the load through three sets of slip rings and brushes.
Description : A synchronous motor is operating on no-load at unity power factor. If the field current is increased, power factor will become (A) Leading & current will decrease (B) Lagging & current will increase. (C) Lagging & current will decrease. (D) Leading & current will increase.
Last Answer : Ans: A Initially synchronous motor is operating at no load and unity power factor. When field current increases, the excitation will increase. Therefore, p.f will be leading and current will be I CosΦ < I
Description : An alternator is delivering rated current at rated voltage and 0.8 power-factor lagging case. If it is required to deliver rated current at rated voltage and 0.8 power-factor leading, the required excitation will be (A) less. (B) more. (C) more or less. (D) the same.
Last Answer : Ans: B Over excitation gives leading power factor and under excitation gives lagging p.f .
Description : Capacitors can be used in electric distribution systems to improve power factor. This is accomplished by seesawing energy between the capacitor and the _____________. A. generator B. inductive loads C. resistive loads D. all of the above
Description : Write down the formula for distribution factor
Last Answer : Kd = sin (mβ/2) / msin(β/2) where m - number of slots/pole/phase Slot angle β - angle between adjacent slots in electrical degree =180/(slots/pole)
Description : Define distribution factor or winding factor or breadth factor or spread factor
Last Answer : The distribution factor is defined as the ratio of vector sum to arithmetic sum of emf induced in the conductor of one phase spread. OR It is ratio of resultant emf induced when coils are distributed to the resultant emf induced when coils are concentrated.
Description : A motor which can conveniently be operated at lagging as well as leading power factors is the (A) squirrel cage induction motor. (B) wound rotor induction motor. (C) synchronous motor. (D) DC shunt motor.
Last Answer : (C) synchronous motor.
Description : What is the Leading Power Factor ?
Last Answer : When the capacitive load of an AC circuit exceeds the inductive load , the pf of the circuit is called the leading pf . Thank you!
Description : What is the leading power factor ?
Last Answer : When the amount of capacitive load is more than the inductive load in a circuit then the power factor of that circuit is called leading power factor.
Description : When is the power factor lagging , leading , unity ?
Last Answer : Power factor lagging in inductive load. Power factor leading in capacitive load is power factor unity in resistive load.
Description : What is Leading Power Factor ?
Last Answer : If the current in the AC circuit is ahead of the voltage, it is called leading power factor.
Last Answer : a . C. _ On the circuit Inductive Of load Than Capacitive Load More If , voltage Of current Later Location By , of the circuit This In condition Power To the factor Leading Power Factor Says. This To the circuit Capacitive Circuit Says.
Description : The power factor of industrial loads is generally (a) unity (b) lagging (c) leading (d) zero
Last Answer : (b) lagging
Description : [75] Two transformers are connected in parallel. These transformers do not have equal percentage impedance which results A. Short-circuiting of the secondaries B. Power factor of one of the ... have negligible core losses D. Loading of the transformers not in proportion to their kVA ratings.
Last Answer : D. Loading of the transformers not in proportion to their kVA ratings
Description : 51 A transformer has negative voltage regulation when its load power factor is A. Zero B. Unity C. Leading D. Lagging
Last Answer : C. leading
Description : The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing
Last Answer : The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing
Description : The synchronous motor which works on leading power factor and does not drive any mechanical load is called?
Last Answer : The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.
Last Answer : Yes, we can make the power factor of synchronous motor leading by adjusting its excitation.
Description : Which of the following is/are true concerning electric power operated watertight door systems? A. Each motor driven door must use the main bus as its source of power. B. Each distribution panel for ... to permit quick activation of the system. D. Each system must have a separate branch circuit.
Last Answer : Answer: D
Description : The purpose of the automatic bus transfer shown in the illustration is to ___________. EL-0014 A. stepdown voltage to the lighting distribution panel B. provide emergency power to ... emergency switchboard from the main switchboard D. provide overcurrent protection to the lighting distribution panel
Description : Federal Regulations (46 CFR) require the circuit in the illustration to _________. EL-0009 A. be at the vessel's ship's service generator distribution switchboard for normal power, normal lighting ... ground will interfere with the operation of electronic equipment D. All the above are correct
Description : In the illustrated one line diagram, if the turbo generator fails, the diesel generator_________. EL-0014 A. will automaticly start and supply power to the emergency power switchboard, the power ... be manually started but once running will supply power to the lighting main through the ABT.
Description : If the illustrated motor fails to start and gives a loud hum when the start button is pushed, the problem is ________. EL-0007 A. one of the phases to the motor is not energized because of ... electrical distribution system D. 'OL1' is open because of 'T1' overload causing the motor to single phase
Description : The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the _____________. A. bridge control panel B. disconnect links C. governor relay box D. main switchboard
Description : The heating of conductors as a result of resistance in a distribution circuit causes a power loss expressed as _____________. A. line droop B. line loss C. IR drop D. hysteresis
Description : How harmonics generated in electrical power distribution system?
Last Answer : Harmonic frequencies are integral multiples of the fundamental supply frequency, i.e. for a fundamental of 50 Hz, the third harmonic would be 150 Hz and the fifth harmonic would be 250 ... the corresponding application guides, since the electricity grid's protection system should cut off the fault.
Description : At what power maximum efficiency of power transformer and distribution transformer is designed
Last Answer : Maximum efficiency of the transformer is attained at certain load factor (α) when core losses of transformer is equal to the copper losses. PCore loss = α ^2 X PCopper loss From the ... the day. Hence distribution transformers are designed to have maximum efficiency at 50% of the rated full load
Description : As shown in the illustration, which of the listed actions of the synchroscope pointer is occurring? EL-0002 A. Revolving slowly in the slow direction. B. Revolving rapidly in the slow direction. C. ... stationary at the 12 o'clock position since the leading edges of the A phases are in phase.
Description : The division of kilowatt load between two paralleled alternators is determined by the _____________. A. amount of field excitation of the leading machine B. load-speed characteristics of the governors C. amount of field excitation to the lagging machine D. type of alternator
Description : The division of kilowatt load between two paralleled alternators is determined by the _____________. A. amount of field excitation to the leading machine B. load-speed characteristics of the governors C. amount of field excitation to the lagging machine D. number of field poles per alternator
Description : Which line in figure 'A' shown in the illustration represents the leading edge of the wave? EL-0088 A. W B. X C. Y D. Z
Description : What is leading quantity?
Last Answer : The alternating quantity that reaches its maximum value earlier than the other quantity is known as the leading quantity.
Description : In a transformer the voltage regulation will be zero when it operates at (A) unity p.f. (B) leading p.f. (C) lagging p.f. (D) zero p.f. leading.
Last Answer : (B) leading p.f.
Description : State the working principle and operation of Automatic power factor controller used in Transmission and Distribution system.
Last Answer : Diagram of Automatic over factor controller Automatic Power factor control: The pf controller is used to maintain the pf at unity across the lines it is connected. Maintaining the pf at ... the load demand in the system is increased. 8. Check if power transformer compensation is provided.
Last Answer : In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.
Description : Where p is a factor of the leading coefficient of the polynomial and q is a factor of the constant term.?
Last Answer : Anywhere. Provided it is not zero, and number p can be theleading coefficient of a polynomial. And any number q can be theconstant term.
Description : In patients with chronic granulomatous disease which of the following agents increases the synthesis of tumor necrosis factor, leading to activation of phagocytosis? (a) Aldesleukin (b) Cyclosporine (c) Filgrastim (d) Infliximab (e) Interferon gamma
Last Answer : Ans: E
Description : Essential factor leading to the development of well irrigation would be (A) Uneven ground with many natural depressions. (b) Nonporous rocks. (c) High water table and soft soil. (d) None
Last Answer : (c) High water table and soft soil.
Description : Which of the following busbar arrangement is generally employed in distribution system: a) One-and-half breaker arrangement b) Main and transfer arrangement c) Ring main distribution system d) Single busbar arrangement system
Description : Which distribution system is more reliable? (a) Ring main system (b) Tree system (c) Radial system (d) All are equally reliable
Last Answer : Ans: A
Description : A ground detection system is shown in the illustration for a three-phase ungrounded distribution system. Which of the following statements describes the conditions indicated if a full ground occurs in line 'A'? EL-0009 A ... . D. Lamp 'A' will go out and Lamps 'B' and 'C' will burn brightly.
Description : In the lighting distribution circuit shown in the illustration, if all switches are closed and fuse 'F2' were to open, all lights on branches ____________. EL-0013 A. '1', '2', and '3' would go out B. '1' ... and '3' would burn dimly D. '1' and '3' would go out, while branch '2' would remain lit