Recent questions tagged working

asked May 27, 2020 by anonymous

State working principle of alternator. State the meaning self and separate excitation.

Last answer: Working principle of alternator: When a conductor is moved in magnetic field or a magnetic field moved with respect to conductor, according to Faraday's law of electromagnetic induction, the conductor ... like battery or shaft-mounted exciter, then the excitation is said to be separate excitation.

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93 views 1 answer

asked May 22, 2020 by anonymous

Explain the working principle of induction motor.

Last answer: Working principle of induction motor: * When the motor is excited with three-phase supply, three-phase stator winding carries three-phase currents & produces a rotating magnetic field of constant magnitude and ... , which tend to move the rotor in the same direction as the rotating magnetic field.

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46 views 1 answer

asked May 21, 2020 by anonymous

Describe working of online UPS. List any two applications of UPS.

Last answer: Online UPS: The block diagram of the on line UPS systems is as shown, where the load is connected to the invertor through the UPS static switch. The UPS static switch is ... 4) Healthcare: hospitals, clinics and retirement homes 5) Telecommunications 6) Special projects (events)

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61 views 1 answer

asked May 21, 2020 by anonymous

Explain working of static AC circuit breaker.

Last answer: Static AC Circuit breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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102 views 1 answer

asked May 7, 2020 by anonymous

Explain with neat sketch the working principle of MIG.

Last answer: In metal-arc inert gas welding the Weld area is shielded by an effectively inert atmosphere of argon, helium, carbon dioxide, or various other gas mixtures . The consumable bare Wire is fed automatically ... of the molten-weld puddle. Multiple-weld layers can be deposited at the joint.

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67 views 1 answer

asked May 7, 2020 by anonymous

Explain construction and working of AC servomotor.

Last answer: Construction of AC Servo Motor: AC servo motor is mainly composed of a stator and a rotor. Laminated stator core is usually made of silicon steel. Two phase windings are placed in the stator slots at 90 degree ... on rotor. Due to the force or torque acting on the rotor, it is set in motion.

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96 views 1 answer

asked May 7, 2020 by anonymous

Describe with neat sketch working of hysteresis motor.

Last answer: Working: When stator is energized with single phase ac supply, rotating magnetic field is produced because of starting (auxiliary) and main windings, which remain in circuit permanently. The ... the principle of magnetic locking this motor either rotates at synchronous speed or not at all.

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125 views 1 answer

asked May 3, 2020 by anonymous

Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.

Last answer: Thyristor operated dimmer: A popular thyristor operated dimmer circuit employ TRIAC-DIAC phase control for low AC power control. During each half-cycle, the capacitor charges through (R1+VR1). When the ... time constant {C (R1+VR1)}. Thus by reducing VR1 the lamp brightness can be increased.

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178 views 1 answer

asked May 3, 2020 by anonymous

Explain the working of Neon sign tube with diagram.

Last answer: Neon sign tube: The construction & circuit diagram for neon tube is as shown in fig. Basically neon tube is used for advertisement or decoration purpose. The maximum length of tube is ... the HT transformer must be earthed separately. * Caution notice of danger board is required.

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158 views 1 answer

asked May 3, 2020 by anonymous

Explain the working of HPMV Lamp with neat diagram.

Last answer: High-pressure Mercury-Vapour Lamp (HPMVL): Working: * Whenever 1-ph, 230V, AC Supply is provided to the discharge tube of MVL, initially the current flows from Phase to the choke to ... : The function of power factor improvement capacitor is to improve the power factor from 0.5 to 0.95.

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189 views 1 answer

asked Apr 27, 2020 by anonymous

With a neat sketch give the working of shaded pole induction motor.

Last answer: Explanation: It has squirrel cage rotor and salient pole stator. The stator poles are shaded partially by short circuited conductor band to create the phase difference between the fluxes emerging from shaded ... rotating magnetic field in the air-gap and torque is exerted on the squirrel cage rotor.

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115 views 2 answers

asked Apr 27, 2020 by anonymous

Give the working of MCCB.

Last answer: Working of MCCB: ( Molded Case Circuit Breaker) * The operating mechanism consisting of lever, spring, contacts etc. is used to open or close the MCCB electrically. * The arc ... produced by short-circuit current operates the lever to trip the MCCB immediately and open the contacts.

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81 views 1 answer

asked Oct 13, 2019 by anonymous

Explain working of AC circuit breaker using SCR with circuit diagram.

Last answer: AC Circuit Breaker: The circuit configuration of static AC circuit breaker using SCR is shown in the figure. When switch S' is closed, the SCRs T1 and T2 are fired in positive ... to non-availability of gate current. Thus the maximum time delay for breaking the circuit is one half-cycle.

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678 views 1 answer

asked Aug 10, 2019 by anonymous

State the working principle of gears and give its applications.

Last answer: Working Principle: Gears are mechanical elements which transmit motion by means of successively engaging teeth. Gears are used to transmit motion from one shaft to another or between ... Agricultural equipment. Industrial construction. Mining equipment. Automotive equipment.

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84 views 1 answer

asked Aug 9, 2019 by anonymous

Explain the construction and working of LVDT accelerometer with the help of diagram.

Last answer: Explanation:* The LVDT accelerometer consists of one primary and two secondary windings which are placed on either side of central code. The two ends of the core are connected with ... in the output terminal. This output voltage is directly proportional to the vibration or acceleration.

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510 views 2 answers

asked Aug 6, 2019 by anonymous

Describe the procedure for working of paging system.

Last answer: Pager is a Simplex Communication Device. Paging Systems are communication systems that send messages to a subscriber. Message can be numeric or alphanumeric. Paging Systems are used to notify a subscriber ... message is sent by sender to his pager and the message will be displayed in the LCD.

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54 views 1 answer

asked Aug 5, 2019 by anonymous

Describe the working principle of photoelectric pickup type tacho-generator.

Last answer: Working: Working principle: The light passes through the holes available on the rotating disc with a specific interval, depends on the angular speed of disc having equidistant holes. The frequency of this light pulses ... by N=f/HS N=speed f=frequency Hs=holes on the disc

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265 views 1 answer

asked Aug 3, 2019 by anonymous

Explain with neat diagram the working of photo-voltaic cell.

Last answer: Diagram the working of photo-voltaic cell: Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps: The solar cell is composed ... . When you connect loads such as a light bulb, electric current flows between the two electrodes.

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135 views 1 answer

asked Aug 2, 2019 by anonymous

Explain the working of Hydro power station with schematic layout.

Last answer: Working of Hydro- Electric Power Plant: Water stored at high level by constructing dam across river. This stored water has potential energy. This stored water is passed to run the water ... energy and Alternator is coupled to water turbine which converts mechanical energy into electrical energy.

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62 views 1 answer

asked Aug 2, 2019 by anonymous

Explain the working of pump storage plant and also state its advantages.

Last answer: Working of Pumped storage hydroelectric power plant :- It consists of head water pond (reservoir) and tail water pond by constructing a dam at tail race path. Tail water pond and ... install as well as spinning reserve capacity of TPP as it provides additional power during peak load period.

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65 views 1 answer

asked Jul 26, 2019 by anonymous

Explain construction and working principle of single phase transformer.

Last answer: A single phase transformers is an electrical device that accepts single-phase AC power and outputs single-phase AC. PRINCIPLE... The single-phase transformer works on the principle of ... and secondary windings. Thin steel laminations shall be employed to prevent power losses from the core.

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346 views 4 answers

asked Oct 28, 2018 by anonymous

Working of western syncroscope

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68 views 0 answers

asked Oct 25, 2018 by Sai

Explain the working of varactor diode

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89 views 0 answers

asked Sep 8, 2018 by anonymous

Explain working of superheater and condenser.

Last answer: Working of Super heater: Super heater consist of group of tubes. Tubes are heated by absorbing temperature of flue gases passed over it . Superheated steam' is meant that steam which ... condensate is reused in boiler. This type of condenser is used for high capacity thermal power plant.

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67 views 1 answer

asked Sep 8, 2018 by anonymous

Explain working of pumped storage plant.

Last answer: Working of pumped storage hydroelectric power plant:- It consists of head water pond (reservoir) and tail water pond by constructing a dam at tail race path. Tail water pond and head water pond ... as centrifugal pump. Raising the water from tail water pond to head water pond through penstock.

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125 views 2 answers

asked Sep 8, 2018 by anonymous

Explain working of fast breeder reactor.

Last answer: Fast Breeder Reactor (FBR): A fast breeder reactor produces heat and at the same time converts fertile material into fissionable material. The central portion of this reactor is a stainless ... or thermal neutrons. In fact no moderator is present at all to slow down the fast neutrons.

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134 views 1 answer

asked Sep 6, 2018 by anonymous

With neat diagram, explain the working of clip-on ammeter.

Last answer: Working of Clip on Ammeter: Clip on ammeters are used to measure the high current flowing through bus bar, cable or fuse holders, which act as primary. It consists of split core current ... then clipped over the current carrying conductor. The dial will record the current directly.

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103 views 2 answers

asked Sep 6, 2018 by anonymous

Draw and describe working of electronic energy meter.

Last answer: working of electronic energy meter:- 1. CT reduces current to reasonable value for current scaling network. 2. Voltage & current scaling networks reduce proportionally the voltage & ... The ADC converts the square wave frequency analog output to display the energy in watthour.

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58 views 1 answer

asked Sep 6, 2018 by anonymous

Describe with working of LCR meter for measurement of inductance.

Last answer: working of LCR:- A LCR meter (Inductance (L), Capacitance (C), and Resistance (R) test equipment used to measure the inductance, capacitance and, resistance of a component. It works on the ... in parallel (as would be encountered in measuring a capacitor with a leaky dielectric) [Q setting ]

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42 views 1 answer