What is dark lamp and bright lamp method for synchronizing? How is the connection made?

What is dark lamp and bright lamp method for synchronizing? How is the connection made?
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Formerly, three light bulbs were connected between the generator terminals and the system terminals. As the generator speed changes, the lights will rise and fall in intensity at a rate proportional to the difference between generator frequency and system frequency. When the
voltage at the generator is opposite to the system voltage (either ahead or behind in phase), the lamps will be bright. When the voltage at the generator matches the system voltage, the lights will be dark. At that instant, the circuit breaker connecting the generator to the system may be closed and the generator will then stay in synchronism with the system.
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Related questions

An AC generator panel is fitted with both synchronizing lamps and a synchroscope. When the synchroscope pointer reaches the noon position, one synchronizing light is bright and the other is dark. This means _____________. A. there is a ground on the phase with the dark lamp B. the phase sequence is incorrect C. the phase sequence is correct D. the generator breaker may be closed

Description : An AC generator panel is fitted with both synchronizing lamps and a synchroscope. When the synchroscope pointer reaches the noon position, one synchronizing light is bright and the other is dark. This ... sequence is incorrect C. the phase sequence is correct D. the generator breaker may be closed

Last Answer : Answer: B

After a black out the emergency generator comes on; On restoring the main supply we are closing the circuit breaker of the main generator without bothering about synchronizing. How is this possible?

Description : After a black out the emergency generator comes on; On restoring the main supply we are closing the circuit breaker of the main generator without bothering about synchronizing. How is this possible?

Last Answer : There is a power link connection breaker between the main generator and the emergency generator. During black out, this breaker trips. The emergency generator starts and its breaker closes and feeds only ... , there is no paralleling between main and emergency generator. Ask E/O for more details.

In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness. When the test button is pushed, all lamps have equal illumination. You should conclude that ____________. A. there is a ground on the line with the dark lamp B. the dark lamp must be replaced C. there are grounds on the lines with the bright lamps D. this is a normal condition

Description : In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness. When the test button is pushed, all lamps have equal illumination. You ... C. there are grounds on the lines with the bright lamps D. this is a normal condition

Last Answer : Answer: A

What are the advantages and disadvantages of three dark lamps method of synchronizing?

Description : What are the advantages and disadvantages of three dark lamps method of synchronizing?

Last Answer : Advantages: · The synchronous switch using lamps is inexpensive · Checking for correctness of the phase sequence can be obtained in a simple manner which is essential especially when the Alternator ... The frequency of the incoming Alternator in relation to the bus-bar frequency is not available.

A current-carrying conductor makes accidental contact with a wiring conduit. This will be indicated by a _____________. A. low switchboard wattmeter reading B. high switchboard wattmeter reading C. darkened switchboard ground detecting lamp D. darkened switchboard synchronizing lamps

Description : A current-carrying conductor makes accidental contact with a wiring conduit. This will be indicated by a _____________. A. low switchboard wattmeter reading B. high switchboard wattmeter reading C. darkened switchboard ground detecting lamp D. darkened switchboard synchronizing lamps

Last Answer : Answer: C

While paralleling two (2) AC generators using synchronizing lamps only, both lamps will go dark when the generators are ____________. A. running at the same speed B. grounded C. of the same polarity D. in phase

Description : While paralleling two (2) AC generators using synchronizing lamps only, both lamps will go dark when the generators are ____________. A. running at the same speed B. grounded C. of the same polarity D. in phase

Last Answer : Answer: D

What happens in all dark lamp method ?

Description : What happens in all dark lamp method ?

Last Answer : If frequency and phase difference of incoming alternator and busbar are not same then lamps connected across incoming alternator will flicker. The flickering decreases as frequency will become near to each other by adjusting the speed by prime mover.

Indicatewhich one ofthe followingreasonsforthe use of a groundscreenwith antennasisfalse: a. Impossibility of a good ground connection b. Provision of an earth for the antenna c.Protectionofpersonnelworkingunderneath d. Improvement of the radiation pattern of the antenna

Description : Indicatewhich one ofthe followingreasonsforthe use of a groundscreenwith antennasisfalse: a. Impossibility of a good ground connection b. Provision of an earth for the antenna c.Protectionofpersonnelworkingunderneath d. Improvement of the radiation pattern of the antenna

Last Answer : c.Protectionofpersonnelworkingunderneath

Indicatewhich ofthe followingreasonsfor usinga counterpoisewith antenna isfalse: a. Impossibility of a good ground connection b.Protectionofpersonnelworkingunderground c. Provision of an earth for the antenna d. Rockiness of the ground

Description : Indicatewhich ofthe followingreasonsfor usinga counterpoisewith antenna isfalse: a. Impossibility of a good ground connection b.Protectionofpersonnelworkingunderground c. Provision of an earth for the antenna d. Rockiness of the ground

Last Answer : b.Protectionofpersonnelworkingunderground

Please tell me where can I get a lamp , preferably online, that is bright as high noon indoors?

Description : Please tell me where can I get a lamp , preferably online, that is bright as high noon indoors?

Last Answer : You might like this one at Amazon. The brightest is bright enough for me that I can see well up to 10 feet away. The dimmest is soft enough that I can sleep with it on. It's waayyy under ... you can charge your phone while sleeping. I've been using mine for about 10 months with NO complaints!!!

_______ electric power is the most common method used by electrical grids to transfer power.

Description : _______ electric power is the most common method used by electrical grids to transfer power.  (A) One-phase (B) Two-phase (C) Three-phase (D) None of the above

Last Answer : Three-phase electric power is the most common method used by electrical grids to transfer power. 

Please suggest a backlight wireless, battery powered, keyboard that is bright enough to use in the dark?

Description : Please suggest a backlight wireless, battery powered, keyboard that is bright enough to use in the dark?

Last Answer : I have Logitech but it isn’t back-lit, this one is a back-it keyboard.

why are my geraniums blooming dry dark colored blooms? Everyone else's seem to be bright red

Description : why are my geraniums blooming dry dark colored blooms? Everyone else's seem to be bright red

Last Answer : I would change the soil in the container to that new vitamen soil. Ph should be 6.0-8.0

what kind of squash or gourd is oval, bright yellow on top ,dark green on bottom , lumpy skin? are they edible?

Description : what kind of squash or gourd is oval, bright yellow on top ,dark green on bottom , lumpy skin? are they edible?

Last Answer : Need Answer

I have an eye in the middle of me, but as you see, I cannot see. I am dark and not far away. You don't see me every day. I am not night and I am not bright. I can have twists and water and scares. What am I? -Riddles

Description : I have an eye in the middle of me, but as you see, I cannot see. I am dark and not far away. You don't see me every day. I am not night and I am not bright. I can have twists and water and scares. What am I? -Riddles

Last Answer : A hurricane.

I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. I can be in many different forms and shapes. What am I? -Riddles

Description : I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. I can be in many different forms and shapes. What am I? -Riddles

Last Answer : The moon!

The marathon man timed himself and found out that if he wore a bright white outfit he ran 20 miles in 80 minutes, but when he wore a dark outfit, he ran 20 miles in one hour and twenty minutes. What does this mean for his next race? -Riddles

Description : The marathon man timed himself and found out that if he wore a bright white outfit he ran 20 miles in 80 minutes, but when he wore a dark outfit, he ran 20 miles in one hour and twenty minutes. What does this mean for his next race? -Riddles

Last Answer : Absolutely nothing, as 80 minutes equals an hour and twenty minutes.

When I point up it's bright, but when I point down it's dark. What am I? -Riddles

Description : When I point up it's bright, but when I point down it's dark. What am I? -Riddles

Last Answer : A Light Switch.

When a person enters a dark room from bright light he is not able to see clearly for little while because ______ A. Eye is unable to adjust itself immediately B. Retina becomes insensitive momentarily C. Iris is unable to dilate the pupil immediately D. Distance between the lens and retina take time to adjust

Description : When a person enters a dark room from bright light he is not able to see clearly for little while because ______ A. Eye is unable to adjust itself immediately B. Retina becomes insensitive ... is unable to dilate the pupil immediately D. Distance between the lens and retina take time to adjust

Last Answer : ANSWER: C

When a person enters a dark room from bright light, he is not able to see clearly for a little while because the (a) eye is unable to adjust itself immediately (b) retina becomes insensitive momentarily (c) iris is unable to dilate the pupil immediately (d) distance between the lens and retina takes time to adjust

Description : When a person enters a dark room from bright light, he is not able to see clearly for a little while because the (a) eye is unable to adjust itself immediately (b) retina becomes insensitive ... is unable to dilate the pupil immediately (d) distance between the lens and retina takes time to adjust

Last Answer : Ans:(c)

When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye lens (b) The retina retains the bright images for some time and becomes momentarily insensitive (c) The iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Description : When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye ... iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Last Answer : Ans:(d)

A ground on a particular phase of a three-phase low voltage distribution system would be indicated by a _____________. A. high switchboard wattmeter reading B. low switchboard wattmeter reading C. dark or dim switchboard ground detecting light D. bright switchboard ground detecting light

Description : A ground on a particular phase of a three-phase low voltage distribution system would be indicated by a _____________. A. high switchboard wattmeter reading B. low switchboard wattmeter reading C. dark or dim switchboard ground detecting light D. bright switchboard ground detecting light

Last Answer : Answer: C

When a person enters a dark room from bright light he is not able to see clearly for a little while because the? A. Eye is unable to adjust itself immediately B. Retina becomes insensitive momentarily C. Iris is unable to dilate the pupil immediately (Answer) D. Distance between the lens and retina take time to adjust

Description : When a person enters a dark room from bright light he is not able to see clearly for a little while because the? A. Eye is unable to adjust itself immediately B. Retina becomes insensitive ... to dilate the pupil immediately (Answer) D. Distance between the lens and retina take time to adjust

Last Answer : C. Iris is unable to dilate the pupil immediately (Answer)

The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Description : The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Last Answer : can be used to assess the overall retinal integrity in the presence of media opacity

The _____ microscope would be used to view cell structures within ultrathin sections of cells. a. scanning electron b. transmission electron c. bright-field d. dark-field

Description : The _____ microscope would be used to view cell structures within ultrathin sections of cells. a. scanning electron b. transmission electron c. bright-field d. dark-field

Last Answer : b. transmission electron

In Newton’s rings experiment, if we reduce the radius of curvature of Plano Convex lens to zero, what will be effect on Newton’s rings? (a)They will become more bright (b)They will become more dark ( c)They will disappear (d) They will be more dense

Description : In Newton’s rings experiment, if we reduce the radius of curvature of Plano Convex lens to zero, what will be effect on Newton’s rings? (a)They will become more bright (b)They will become more dark ( c)They will disappear (d) They will be more dense

Last Answer : ( c)They will disappear

Interference pattern is observed in wedge-shaped film for monochromatic light. Now monochromatic light is replaced by white light. What will be the effect on interference pattern? (a) It will turn to dark (b) It will turn to bright (c) Bands will disappear (d) It will be a mixture of all colors

Description : Interference pattern is observed in wedge-shaped film for monochromatic light. Now monochromatic light is replaced by white light. What will be the effect on interference pattern? (a) It will turn to dark (b) It will turn to bright (c) Bands will disappear (d) It will be a mixture of all colors

Last Answer : (d) It will be a mixture of all colors

What is the nature of interference pattern at the contact edge of wedge shaped film (a) Always bright (b) Always dark (c) Bright or dark depending upon the thickness of other end (d) Bright or dark depending upon the wavelength of the light

Description : What is the nature of interference pattern at the contact edge of wedge shaped film (a) Always bright (b) Always dark (c) Bright or dark depending upon the thickness of other end (d) Bright or dark depending upon the wavelength of the light

Last Answer : (b) Always dark

Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen? A.A sharp bright point of the width equal to width the pinhole B. A bright point of the width equal to width the pinhole but of less intensity C. A bright ring at the centre surrounded by alternate dark and bright rings D. A diffused bright point

Description : Diffraction due to circular aperture If a light passes through a small pinhole, and incident on a screen. What will be observed on the screen? A.A sharp bright point of the width equal to ... A bright ring at the centre surrounded by alternate dark and bright rings D. A diffused bright point

Last Answer : C. A bright ring at the centre surrounded by alternate dark and bright rings

When Newton’s rings interference pattern is viewed from above by means of reflected light, the central spot is __________. A. Dark B. Multi colored C. Bright D. None of these

Description : When Newton’s rings interference pattern is viewed from above by means of reflected light, the central spot is __________. A. Dark B. Multi colored C. Bright D. None of these

Last Answer : A. Dark

.Fringe spacing is defined as the distance between two Consecutive __________. A. Crests B. Bright fringes only C. Dark fringes only D. Bright or dark fringes

Description : .Fringe spacing is defined as the distance between two Consecutive __________. A. Crests B. Bright fringes only C. Dark fringes only D. Bright or dark fringes

Last Answer : A. Crests

The points of constructive interference of light are__________. A. Always bright B. may be bright or dark C. always dark D. neither bright nor dark

Description : The points of constructive interference of light are__________. A. Always bright B. may be bright or dark C. always dark D. neither bright nor dark

Last Answer : A. Always bright

In Newton’s rings the central spot is __________. A. Always bright B. always dark C. can be bright or dark D. of blue color

Description : In Newton’s rings the central spot is __________. A. Always bright B. always dark C. can be bright or dark D. of blue color

Last Answer : C. can be bright or dark

In reflected light the central fringes of Newton's ring is A. dark B. Bright C. Uniform D. Non uniform

Description : In reflected light the central fringes of Newton's ring is A. dark B. Bright C. Uniform D. Non uniform

Last Answer : A. dark

When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye lens. (2) the retina retains the bright images for sometime and becomes momentarily insensitive. (3) the iris is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Description : When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye ... is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Last Answer : the iris is unable to dilate the pupil immediately.

There is a lamp inside a photography darkroom. When the darkroom door is closed, it is impossible to tell from outside the room whether or not the lamp is on. There are two switches outside the door of the darkroom. One or both of the switches may control the lamp. It also could be that neither of the switches control the lamp. All you know is that the light bulb is currently off and that the lamp and bulb are in working condition. The darkroom door is closed and once you open the door you cannot touch either of the switches. If you can only open the dark-room door one time, how can you tell which switches, if any, control the lamp? -Riddles

Description : There is a lamp inside a photography darkroom. When the darkroom door is closed, it is impossible to tell from outside the room whether or not the lamp is on. There are two switches outside the door of ... dark-room door one time, how can you tell which switches, if any, control the lamp? -Riddles

Last Answer : Turn the first switch on and leave it on for ten minutes. After ten minutes, turn that switch off and turn the second switch on. Open the darkroom door, and lightly (in case it is hot) touch the ... one controls the lamp. If the lamp is off, and the bulb is cool, neither switch controls the lamp.

A three-phase electrical system is equipped with ground detecting lamps. If one of the lamp goes dark and the other two burn normally before and after the test switch is operated, this indicates _______________. A. the dark lamp must be replaced B. there is a ground in the line with the dark lamp C. there are grounds in two of the three phases D. the voltage to the dark lamp is less than that of the system

Description : A three-phase electrical system is equipped with ground detecting lamps. If one of the lamp goes dark and the other two burn normally before and after the test switch is operated, this indicates _______________. ... of the three phases D. the voltage to the dark lamp is less than that of the system

Last Answer : Answer: A

If you had only one match and entered a COLD and DARK room, where there was an oil heater, an oil lamp and a candle, which would you light first?

Description : If you had only one match and entered a COLD and DARK room, where there was an oil heater, an oil lamp and a candle, which would you light first?

Last Answer : The match.

What are Common deterioration of lamp holders and their wire connection?

Description : What are Common deterioration of lamp holders and their wire connection?

Last Answer : Feel Free to Answer

The use of permanent magnets is. not made in (a) magnetoes (6) energy meters (c) transformers (d) loud-speakers

Description : The use of permanent magnets is. not made in (a) magnetoes (6) energy meters (c) transformers (d) loud-speakers

Last Answer : (c) transformers

Short-circuited stubs are preferred to open-circuited stubs because thelatter are a. more difficult to make an connect b. made of a transmission line with a different characteristic impedance c. liable to radiate

Description : Short-circuited stubs are preferred to open-circuited stubs because thelatter are a. more difficult to make an connect b. made of a transmission line with a different characteristic impedance c. liable to radiate

Last Answer : c. liable to radiate

Permanent magnets are generally made of

Description : Permanent magnets are generally made of

Last Answer : Alnico alloys

Transistors are made from (a) Plastic (b) metals (c)insulators (d) doped semiconductors

Description : Transistors are made from (a) Plastic (b) metals (c)insulators (d) doped semiconductors

Last Answer : d) doped semiconductors

If velocity of a conductor moving through a magnetic field ‘B’ is made zero, then Motional emf will be: a. –VBL b. –V/BL c. – BL/V d. zero

Description : If velocity of a conductor moving through a magnetic field ‘B’ is made zero, then Motional emf will be: a. –VBL b. –V/BL c. – BL/V d. zero

Last Answer : a. –VBL

The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these

Description : The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these

Last Answer : c) make the magnetic field radial

Synchronizing iCal to Google Calendar?

Description : Synchronizing iCal to Google Calendar?

Last Answer : get on http://Digg.com they have an article talking about how you can do it. Just search iCal.