Answer :
In split phase motor main winding is of thick wire placed at the bottom of the slots.
asked
Mar 20, 2018
by
anonymous
Answer :
The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.
asked
Mar 20, 2018
by
anonymous
Description : Write one advantage and one disadvantage each for spring control method and gravity control method.
Answer :
Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.
asked
Sep 6, 2018
by
anonymous
Description : List one advantage and one disadvantage of one wattmeter method.
Answer :
Advantages: 1) Only one wattmeter is used. 2) Less number of connections. 3) Cost required is less. Disadvantages: 1) Used only for 3- Φ balanced load and not for ... be accessible for connecting the Pressure coil. 3) Delta connection must be opened to connect current coil.
asked
Sep 5, 2018
by
anonymous
Description : What are the main electrical equipment used in HPS ? State the function of each parts of it in brief.
Answer :
Following Main Electrical Equipment used in HPS & their function: 1. Alternator 2. Exciter 3. Transformer 4. Switchgear Function : 1) Alternator:- Alternator is coupled to ... part from the healthy section. It contains circuit breaker, relays, switches and other control devices.
asked
Aug 2, 2019
by
anonymous
Description : What is the main purpose of electroplating?
Answer :
Protecting reactive metals from corrosion.
asked
Mar 11, 2018
by
anonymous
Description : What is the main use of a transistor?
Answer :
Main use of a transistor as amplifier and as switch.
asked
Mar 10, 2018
by
anonymous
Description : What are the main causes of harmonics?
Answer :
Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter
asked
Mar 10, 2018
by
anonymous
Description : What are the main parts of a generator?
Answer :
the main parts of the generator are as follows yoke Armature Poles field winding Prime mover Commutator Shaft Bearings Brushes
asked
Dec 16, 2017
by
anonymous
Description : List the main parts of D.C. motor
Answer :
Main parts of D.C. motor and their functions: Part Functions Yoke i) Provides mechanical support for poles. ii) Acts as protecting cover for machine. iii) Carries magnetic flux. ... a fixed physical position relative to the stator. Shaft Used to transfer mechanical power
asked
Apr 27, 2020
by
anonymous
Description : List out main components of Diesel power station.
Answer :
Main components of Diesel power station: 1) Diesel Engine 2) Engine Air intake system 3) Engine Fuel System 4) Engine Exhaust system 5) Engine cooling system 6) Engine Lubricating system 7) Engine Starting system 8) Diesel Engine Generator (Alternator)
asked
Aug 2, 2019
by
anonymous
Description : List out main components of Reactors.
Answer :
List the main components of Reactors: 1. Core 2. Nuclear fuel (U235) 3. Moderator 4. Control Rod 5. Reflector 6. Reactor vessel 7. Shielding
asked
Aug 2, 2019
by
anonymous
Description : How rating of main switch and cable is selected for Industrial Installation.
Answer :
1. Rating of Main Switch or Fuse Rating is decided in industrial installation: Rating of main switch or fuse is based up the starting current of motor. For calculating starting current is considered 2 ... take 1.5 times the rated current or full load current. & thus cable rating is decided.
asked
Sep 20, 2018
by
anonymous
Description : The main advantage of AC over DC is: (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above
Answer :
Ac is easy to maintain and ac can be easily converted to dc by rectifier .There is no commutator for conversion in ac that's why ac machines are weight less and more efficiency.ac machines occupy less space than dc .
asked
May 8, 2018
by
anonymous
Description : The main objectives in framing tariff are: (A) The consumers must readily understand the tariffs (B) The tariff must be equitable amongst different consumers (C) Tariffs can be modified from time to time (D) All of the above
Answer :
The main objectives in framing tariff are: (A) The consumers must readily understand the tariffs (B) The tariff must be equitable amongst different consumers (C) Tariffs can be modified from time to time (D) All of the above
asked
May 8, 2018
by
anonymous
Answer :
In main line service as compared to urban and suburban service distance between the stops is more, maximum speed reached is high, acceleration and retardation rates are low.
asked
Mar 22, 2018
by
anonymous
Answer :
Discrimination between main and back up protection is provided by the use of relays which are slow.
asked
Mar 20, 2018
by
anonymous
Answer :
The main function of a fuse is to prevent excessive currents.
asked
Mar 19, 2018
by
anonymous
Description : What is phase failure relay and how it's work?
asked
Aug 12, 2019
by
anonymous
Description : What is Phase sequence? Draw waveforms of 3 phase emf.
Answer :
Phase sequence: It is the order in which the three phases reach their peak or maximum values. It is shown in below fig. the phase sequence is A-B-C (or R-Y-B). In the following waveforms, it is ... 120º, B- phase voltage attains its positive maximum value. So the phase sequence is R-Y-B.
asked
Sep 7, 2018
by
anonymous
Description : What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.
asked
Aug 11, 2018
by
anonymous
Description : What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
Answer :
What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these
asked
Apr 29, 2018
by
anonymous
Description : What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
Answer :
What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these
asked
Apr 29, 2018
by
anonymous
Description : What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?
Answer :
90° will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value.
asked
Mar 25, 2018
by
anonymous
Description : What is a phase control thyristor?
asked
Mar 19, 2018
by
anonymous
Description : What are the five types of single phase motors used in the industry?
asked
Mar 15, 2018
by
anonymous
Description : What is the difference between line and phase current?
Answer :
The currents flows through phase lines is called line voltage and currents flows from phase to neutral line is called phase current
asked
Mar 10, 2018
by
anonymous
Description : What is the difference between line and phase voltage?
Answer :
Line voltage is voltage between two phases R &Y (415 v) while phase voltage is the voltage between one phase and a neutral B & N (240 v).
asked
Mar 10, 2018
by
anonymous
Description : What is mean by plugging in three phase induction motor?
Answer :
Plugging in three-phase induction motor means interchanging of any two phases of a stator for quick stopping.
asked
Mar 3, 2018
by
anonymous
Description : What is a three phase connection?
Answer :
RYB, 440 volt/phase
asked
Dec 22, 2017
by
anonymous
Description : What is the voltage in 3 phase line?
Answer :
between 430 to 440 v
asked
Dec 22, 2017
by
anonymous
Description : Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Answer :
Circuit Diagram: Waveforms:
asked
May 21, 2020
by
anonymous
Description : State classification of Phase controlled rectifiers.
Answer :
Classification of phase controlled rectifiers:
asked
May 21, 2020
by
anonymous
Description : Single phase transformer
Answer :
Single phase Transformer Transformer
asked
May 16, 2020
by
anonymous
Description : Explain MCB and ELCB with connection diagram supplying single phase load.
Answer :
OR OR Explanation: * MCB provides short circuit protection. * MCB provides overload protection * ELCB provides earth fault protection. * MCB is in series with ... occurs, the ELCB cuts off the power within the time of 0.1 sec. automatically to protect the personnel.
asked
May 7, 2020
by
anonymous
Description : List different starting methods of three phase synchronous motor. Explain any one of them.
Answer :
Different Starting Methods of Three Phase Synchronous Motor: As synchronous motor is not self starting, different methods of starting are as follows: 1) By using an Induction (Pony) motor 2) ... . The rotor gets pulled into synchronism and starts running at constant speed as a synchronous motor.
asked
May 7, 2020
by
anonymous
Description : State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders
Answer :
Application Suitable Single Phase Motor Table Fan 1) Capacitor split phase motor 2) Capacitor start capacitor run motor Mixers and Grinders 1) Universal motor 2) A.C. Series motor
asked
May 7, 2020
by
anonymous
Description : Draw & explain operation of phase detector.
Answer :
In phase detector, the op-Amp basically acts as a zero crossing detector. If a sine wave is applied at the i/p, we get square wave at the op-Amp o/p (at point ... to two channel of the CRO. The time duration between the pulses corresponding to voltages represent the phase between them.
asked
May 2, 2020
by
anonymous
Description : Explain the concept of lagging and leading phase angle by waveform.
Answer :
i) Leading phase angle : When two ac quantities of same frequency do not attain their respective zero or peak values simultaneously, then the quantities are said to be out-of-phase quantities. The ... Similarly, in the second diagram, the voltage is said to be lagging the current by Φ.
asked
Apr 27, 2020
by
anonymous
Description : Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
asked
Apr 27, 2020
by
anonymous
Description : Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.
asked
Apr 16, 2020
by
anonymous
Description : Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
asked
Apr 16, 2020
by
anonymous
Description : Why is a capacitor used in a single phase motor and not in three phase motor ?
Answer :
In 1-phase induction motor capacitor work is generate the auxiliary winding current than excite the main winding to rotor starts rotate. After rotor start rotating about 75% of their speed than auxiliary ... emf to start the motor.so,in 3-phase induction motor is self start induction motor.
asked
Sep 2, 2019
by
anonymous
Description : Define Amplitude and Phase of Sinusoidal quantity.
Answer :
Amplitudes are expressed either as instantaneous values or mostly as peak values. Amplitude is the fluctuation or displacement of a wave from its mean value. Phase is the position of a ... . Phase an expression of relative displacement between or among waves having the same frequency .
asked
Aug 21, 2019
by
anonymous
Description : working principle of single phase motor
Answer :
The Stator of single phase induction motor houses two windings 1. Main (Running) winding 2. Auxiliary (Starting ) winding Rotor of single phase induction motor is ... with starting winding or a capacitor may be permanently connected in series with Auxiliary (Starting ) winding.
asked
Aug 21, 2019
by
anonymous
Description : Why is a three phase denoted by R, Y, B ?
Answer :
phase 1 ,R =Red colour cable terminal, phase 2 Y=Yellow colour terminal cable,Phase 3 B=Blue colour cable terminal, N =Neutral. For identification.
asked
Aug 18, 2019
by
anonymous
asked
Aug 13, 2019
by
Alacrity
Description : Explain the working of a single phase capacitor start induction motor.
Answer :
Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
asked
Jul 30, 2019
by
anonymous
Description : State any four advantages of three phase induction motor.
Answer :
Advantages of three phase induction motor https://youtu.be/27OIOCKN05U
asked
Jul 30, 2019
by
anonymous
Description : Explain construction and working principle of single phase transformer.
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.
asked
Jul 26, 2019
by
anonymous