The speed of a locomotive is controlled by gear box.
Description : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last Answer : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
Last Answer : Locomotive having monomotor bogies has better coefficient of adhesion, are suited both for passanger as well as freight service, has better riding qualities due to the reduction of lateral forces.
Last Answer : Plugging braking method can bring the locomotive to dead stop.
Last Answer : For given maximum axle load tractive efforts of AC. locomotive will be more than that of D.C. locomotive.
Last Answer : In a steam locomotive electric power is provided through small turbo-generator.
Last Answer : The overall efficiency of steam locomotive is around 5 to 10 percent.
Last Answer : Electric locomotive has the highest operational availability.
Description : How does electric locomotive work?
Last Answer : Electric locomotives are powered by motors connected to battery or any supply . The electric supply is connected to a motor which drives set of gears connected to wheels.
Description : State classification of Phase controlled rectifiers.
Last Answer : Classification of phase controlled rectifiers:
Description : Application one lamp controlled from two places
Last Answer : Application one lamp controlled from two places: 1. For Stair case wiring 2. Hospital Wiring ( For operating the lamp in room and nursing station) 3. Bedroom Lighting.
Description : Single-phase mid-point controlled rectifier with RL load
Last Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.
Description : Single-phase Midpoint controlled rectifier with Resistive load
Last Answer : Single-phase Midpoint controlled rectifier with Resistive load: 1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.
Description : Give the operation of single phase full wave bridge controlled converter with RL load with a neat diagram. Also draw its waveform.
Last Answer : Single phase fully control bridge converter with RL load: 1. During positive half cycle of input voltage, T1 and T2 are forward biased and during negative half cycle, T3 and T4 are forward biased. Therefore, T1-T2 ... cycle till the firing of next pair of SCRs as shown in the waveform.
Description : Draw a neat diagram of 1Ф half wave controlled converter with RL load. Give its operation.
Last Answer : Single phase fully controlled half wave converter: The circuit diagram of single-phase half-wave controlled rectifier with RL load and without freewheeling diode is shown in Fig. (a). The SCR T is ... , when again pulse is applied, the SCR is turned on & the above cycle is repeated.
Description : How are nuclear reactors controlled? Explain two different methods in brief.
Last Answer : Nuclear reactor is controlled using control rods: Control rods are made up of very high neutron absorbing material like boron, cadmium. By adjusting height of control rods on reactor core ... of nuclear reaction will increase. Whereas by pushing control rod towards the core it will reduce.
Description : A current controlled voltage source is equivalent to : (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier
Last Answer : A current controlled voltage source is equivalent to : shunt voltage feed -back amplifier
Description : A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is
Last Answer : Please show the solution for this question
Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is
Last Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2
Description : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V
Last Answer : A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V
Description : In voltage source converter based HVDC transmission system the active power is controlled by changing (A) phase angle of the converter ac input voltage (B) supply frequency of the converter ac input voltage (C) magnitude of the converter ac input voltage (D) DC voltage at the inverter terminals
Last Answer : In voltage source converter based HVDC transmission system the active power is controlled by changing phase angle of the converter ac input voltage
Description : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is
Last Answer : For a 15-bus power system with 3 voltage controlled buses, the size of Jacobian matrix is 25 x 25
Last Answer : The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.
Last Answer : MOSFET are voltage controlled devices.
Last Answer : BJT is current controlled device.
Last Answer : No, IGBT is not the current controlled device. IGBT is a voltage controlled device. IGBT have combine qualities of MOSFET and BJT. The high switching speed of MOSFET and low conduction losses of BJT. Also, IGBT which stands for Insulated Gate Bipolar Transistor have high input impedance.
Last Answer : Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.
Last Answer : In BJT there is movement of electrons and holes accros the junctions which is basicaly current flow.
Last Answer : No, BJT is a current controlled device .
Last Answer : already answered here is mosfet current controlled device?
Description : Chopper controlled DC motor
Last Answer : Chopper controlled DC motor
Description : How can I train myself to speed-type...( or at least type faster and more controlled ) ?
Last Answer : Practicing everyday, trying it on a qwerty keyboard?
Description : The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
Last Answer : The speed of a D.C. motor can be controlled by varying 1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above
Description : what is TCSC?
Last Answer : Thyristor Controlled Series Capacitor (TCSC)
Description : If the math was easier then could we have a speed limit on automobile acceleration?
Last Answer : Our test cars had numerous g sensors to measure acceleration. It was fun. It was also possible to calculate it on the fly. You can do it yourself with a cheap, used, mechanical, air craft angle of attack meter. You can get them for $5–10 at army surplus stores. 45 degrees means 1 g.
Description : What would a keyboard built for speed be like?
Last Answer : That would be the Dvorak keyboard, patented in 1936. It has its fans, but it has never caught on.
Description : Should fast acceleration be included in the speed limit?
Last Answer : How?
Description : Can we put speed limits for cars based on a mathematical fourmula?
Last Answer : All roads have a base design speed. We could start with that and adjust up or down depending upon the driver. I’d also put driver’s reaction time into the equation. It’s not practical, but I like it.
Description : Instead of top speed can police ticket for fast acceleration?
Last Answer : answer:Technically, probably not. Realistically? Yes, they could cite you for unsafe driving. For example in the US the yellow speed signs (like on highway ramps) are suggested speeds, not lawfully mandated speeds. ... get a ticket for going 60 in a 45, but you can get a ticket for unsafe driving.
Description : What is the top speed of the fastest helicopter?
Last Answer : “The current World Helicopter Speed Record is held by the Westland Lynx at 217.5 Kts (402 km/h) using specially designed high-speed rotor blades.” I just googled that.
Description : What is the maximum speed that human joints can handle?
Last Answer : It’ll be different for everyone within a certain range. Usain Bolt holds the record at 27.44mph
Description : What is the top speed for a space probe now and in the future?
Last Answer : answer:Currently Helios 2 is the fastest spacecraft ever built-the Helios 2 probe, launched in 1976 to monitor the sun-attained a top speed of 157,000 miles an hour. At that rate, a spacecraft ... from National Geograhic's web article. Future sky is the limit maybe approaching the speed of light.
Description : What is the speed or velocity of our solar system?
Last Answer : I have an app on my smart phone that gives answers to scientific questions. It’s called Wolfram Alpha. I typed in this question, and it says our solar system is moving at 490,000 mph or 220 km/s.
Description : Does the speed of light change?
Last Answer : There is only one universe that we currently know of. “Uni” means one or whole. In that universe, the speed of light is constant. It does not change.
Description : If two objects fly in opposite directions can they both reach the speed of light relative to the starting point?
Last Answer : answer:Well the speed of light isn't infinite, but it's simple. You can't acheive infinity because it has no value, if you were accelerating you infinite speed you would just go faster and faster for ... something. You can't divide by 0, same as you can't divide by infinity, its not possible.
Description : If people could move at the speed of sound, would it have more positive or negative effects in our lives?
Last Answer : I imagine it would be like watching a movie on fast-forward x1000…
Description : What is the speed of action of quantum entanglement over distance? (Strange Universe series)
Last Answer : It’s instantaneous.
Description : What is the literal speed of light?
Last Answer : 3.0*10^8 meters/second, or more specifically, 299,792,458 meters/second. A meter is defined as 1/ 299,792,458 of the distanced traveled by light in one second.
Description : Have you ever seen a speed zone sign that doesn't end with the number "5" or "0"?
Last Answer : I’ve seen 12 mph before, usually around school zones.
Description : What is a good way to increase the speed of my 1.5 year old MacBook?
Last Answer : First clean your computer than probably increasing RAM would be the best thing to do and you can try overclocking too(I don’t now if is possible on Apple products but you can do a little research).
Description : How can gravitation force not have a speed?
Last Answer : No, it does have a speed, the speed of light. Who told you it didn’t?