If one lamp is connected between two phases will it glow or not?

1 Answer

Answer :

A:If the voltage between the two phase is equal to the lamp voltage then the lamp will glow. When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp.

Related questions

Description : Two bulbs of 100w and 40w respectively are connected in series across a 230v supply which bulb will glow bright and why?

Last Answer : A:Since two bulbs are in series they will get equal amount of electrical current but as the supply voltage is constant across the bulb(P=V^2/R).So the resistance of 40W bulb is greater and voltage across 40W is more (V=IR) so 40W bulb will glow brighter.

Description : Battery banks are in connected in series or parallel and why?

Last Answer : A:Battery banks are always connected in series in order to get a multiplied voltage where the AH or current capacity remaining same. Ex : 24 nos. 2V,200Ah batteries connected in series will give 48V,200Ah output (AH = Ampere hours)

Description : How tube light circuit is connected and how it works?

Last Answer : A choke is connected in one end of the tube light and a starter is in series with the circuit. When supply is provided ,the starter will interrupt the supply cycle of AC. Due to the sudden ... to make electron flow. Once the current passes through the tube the starter circuit will be out of part.

Description : Why should be the frequency 50 Hz 60Hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50 Hz 60Hz?

Last Answer : We can have the frequency at any frequency you like, but than you must also make your own motors,high voltage transformers or any other equipment you want to use.We maintain the frequency at 50hz ... maintains a standard at 50 /60hz and the equipments are are made to operate at these frequency.

Description : Why in a three pin plug the earth pin is thicker and longer than the other pins?

Last Answer : A:It depends upon R= ρl/a where area(a) is inversely proportional to resistance (R), so if AREA increases, RESISTANCE decreases & if RESISTANCE is less the leakage current will take low ... the connection and last to disconnnect. This assures Safety for the person who uses the electrical instrument.

Description : 1 ton is equal to how many watts?

Last Answer : 1 ton = 12000 BTU/hr and to convert BTU/hr to horsepower,12,000 * 0.0003929 = 4.715 hp therefore 1 ton = 4.715*.746 = 3.5 KW.

Description : what happens if we give 220 volts dc supply to the bulb or tube light?

Last Answer : A:Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Normally they have low resistance. When DC supply is applied, due to low resistance, the current ... be so high that it may damage the bulb element. Low dc voltage will not damage the appliances

Description : Why, when birds sit on transmission lines or current wires doesn't get shock?

Last Answer : A:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human ... the air. If he is standing on the ground then touching the line (phase) he will get a shock.

Description : Why Human body feel Electric shock ? Why we dont get shock in Electric train in motion?

Last Answer : A:Our body is a good conductor of electricity. Current always flow through the lowest resistant path. If we have insulation to our feet example rubber shoes, the circuit does not get complete. ... get shock. The electric train is well insulated from its electrical system So we dont get shock.

Description : If one lamp connects between two phases it will glow or not?

Last Answer : If the voltage between the two phases is equal to the lamp voltage then the lamp will glow.  When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp.

Description : If 200w, 100 w and 60 w lamps connected in series with 230V AC , which lamp glow brighter? Each lamp voltage rating is 230V.

Last Answer :  Each bulb when independently working will have currents (W/V= I)  For 200 Watt Bulb current (I200) =200/230=0.8696 A  For 100 Watt Bulb current (I100) =100/230=0.4348 A  ... current through it. So minimum power dissipated across it as min current X equal Voltage across =s min power dissipation

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

Description : Two bulbs of 100w and 40w respectively connected in series across a 230v supply which bulb will glow bright and why?

Last Answer : Since two bulbs are in series they will get equal amount of electrical current but as the supply voltage is constant across the Bulb (P=V^2/R).So the resistance of 40W bulb is greater and voltage across 40W is more (V=IR) so 40W bulb will glow brighter.

Description : An electric bulb is connected on a holder. One end of the wire is connected to the phase and the remaining one connected to earth instead of neutral. The bulb will glow or not? If yes then what is the need of neutral?

Last Answer : 1. Yes the bulb will be glow & neutral is return path of Circuit it is originated from distribution transformers star point, form this point only neutral is taken. 2. Then what is the need ... : It gives assurance of reliable centralized earthling as your home may or may not have reliable earthling.

Description : At what points along a transmission line will a neon lamp glow the brightest?

Last Answer : At standing-wave voltage peaks.

Description : What current is required to light two 75 watt lamps and one 40 watt lamp when connected in series to a 120 volt power source? A. 0.161 amperes B. 0.631 amperes C. 1.583 amperes D. 6.199 amperes

Last Answer : Answer: C

Description : Which of the following statements is true if a 100 watt lamp and a 75 watt lamp are connected in parallel across a 100 volt power supply? A. The 75 watt lamp will draw as much current as the 100 ... Current flow will be the same across each lamp. D. The 75 watt lamp will have a higher resistance.

Last Answer : Answer: D

Description : Four lamps are connected in parallel in a single circuit. If one of the lamp burns out, the others will _____________. A. all go out B. become dimmer C. burn with their original intensities D. become brighter

Last Answer : Answer: C

Description : A burned-out LED should be indicated by _____________. A. excessive output B. a slight glow in the crystal C. excessive illumination D. no illumination

Last Answer : Answer: D

Description : Three lamps are connected in parallel across a 120 Volt source. If one lamp burns out, the remaining two will be: A. Glow dimmer B. Glow brighter C. Not light D. Glow with the same brightness as before

Last Answer : Glow with the same brightness as before 

Description : When a pure inductor is connected in series with a lamp circuit, effect is: -  a) Dimmer b) Brighter c) Same d) Fused

Last Answer : When a pure inductor is connected in series with a lamp circuit, effect is: -  Dimmer 

Description : Why three phases? Why not one or two or four?

Last Answer : In 1-phase and 2-phase power, there are 120 moments per second when a sine wave is crossing zero volts. In 3-phase power, at any given moment one of the three phases is nearing a peak. ... would not significantly improve things but would add a fourth wire, so 3-phase is the natural settling point.

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.

Last Answer : Answer: C

Description : In a three-phase electrical system, three ground detecting lamps are provided. If all three lamps REMAIN at half-brilliance when the ground detecting test switch is operated, ______________. A. there is a ... must be replaced C. there are no grounds present D. the light bulbs are of improper voltage

Last Answer : Answer: C

Description : If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, then ___________. A. no grounds exist B. all phases are grounded C. all lamps show a ground D. all of the above

Last Answer : Answer: A

Description : When paralleled, AC generators must have the same _________. A. frequency B. number of phases C. phase rotation D. all of the above

Last Answer : Answer: D

Description : If all three ground-detection lamps continue to burn at equal intensity after the test button is depressed and released, which of the listed conditions is indicated? A. No grounds exist B. All three phases are grounded C. The test switch is faulty D. The current transformers are shorted out

Last Answer : Answer: A

Description : Which of the following represents a characteristic of an ungrounded electrical distribution system? A. Accidental contact between one line and ground does not cause an outage. B. Double ground faults on ... unnecessary. D. Accidental contact between one line and ground will always cause an outage.

Last Answer : Answer: A

Description : A bus disconnect link is used to isolate _____________. A. one bus bar from another B. the generator circuit breaker from the bus C. different phases from the equalizer connection D. positive and negative buses from the neutral

Last Answer : Answer: B

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

Last Answer : Answer: A

Description : Which of the following procedures should be used to determine the load of a threephase, delta wound, AC generator? A. Multiply the amperage in one phase by three. B. Divide the total amperage in all ... square root of three. D. Divide the total amperage in all phases by the square root of three.

Last Answer : Answer: C

Description : On a switchboard, if all three ground detection lamps remain burning at half intensity when the test button is depressed, which of the listed conditions is indicated? A. No grounds exist. B. All three phases are grounded. C. The test switch is grounded. D. The current transformers are shorted.

Last Answer : Answer: A

Description : The speed of a three-phase squirrel-cage induction-type motor operating in a fixed frequency system is varied by changing the _____________. A. number of phases to the motor B. number of stator poles C. locked rotor current D. resistance of the rotor winding

Last Answer : Answer: B

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.

Last Answer : Answer: A

Description : A degree of control over the speed of a slip ring induction motor can be obtained by _____________. A. adjusting governor linkage B. changing the number of phases to the motor C. inserting resistance into the stator circuit D. inserting resistance into the rotor circuit

Last Answer : Answer: D

Description : A flickering ground detection lamp on a DC system would indicate a _____________. A. multiple-ground condition in the distribution system B. ground in an armature coil of an operating machine C. ground in a motor accompanied with a short D. short between two adjacent bars of the generator commutator

Last Answer : Answer: B

Description : The ground detection system, shown in the illustration for a low-voltage, threephase system has a ground in line 'A'. Therefore, lamp 'A' will burn ____________. EL-0009 A. dimly or be out, and lamps 'B' and ... and 'C' will burn dimly or be out D. brightly, and lamps 'B' and 'C' will burn normally

Last Answer : Answer: A

Description : When using the test set-up shown in the illustration, the lighted lamp indicates the winding is ____________. EL-0027 A. grounded B. good C. open D. shorted

Last Answer : Answer: A

Description : A lamp is provided with 110 volts and draws a current of 0.8 amps. What is the resistance of the lamp? A. 12.2 ohms B. 88.0 ohms C. 122.2 ohms D. 137.5 ohms

Last Answer : Answer: D

Description : A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the resistance of the lamp? A. 0.008 ohms B. 0.08 ohms C. 12.22 ohms D. 122.22 ohms

Last Answer : Answer: D

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

Description : When a fluorescent lamp fails to light, the trouble can be in the _____________. A. lamp B. starter C. ballast D. all of the above

Last Answer : Answer: D

Description : In the illustrated test, if the lamp fails to light on any of the three windings then _________. EL-0027 A. all three windings are grounded and the motor should be sent out for repair B. ... the motor controller and the controller should be checked D. the test should be redone at a higher voltage

Last Answer : Answer: C

Description : The electrical device shown in the illustration is a/an _____________. EL-0077 A. operating coil B. indicating lamp C. motor armature D. potentiometer

Last Answer : Answer: D