Last Answer : In split phase motor main winding is of thick wire placed at the bottom of the slots.
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83 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.
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102 views
1 answer
asked
Mar 20, 2018
by
anonymous
Write one advantage and one disadvantage each for spring control method and gravity control method.
Last 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.
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720 views
2 answers
asked
Sep 6, 2018
by
anonymous
List one advantage and one disadvantage of one wattmeter method.
Last 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.
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1.4k views
1 answer
asked
Sep 5, 2018
by
anonymous
List the main parts of D.C. motor
Last 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
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149 views
1 answer
asked
Apr 27, 2020
by
anonymous
What are the main electrical equipment used in HPS ? State the function of each parts of it in brief.
Last 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.
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141 views
1 answer
asked
Aug 2, 2019
by
anonymous
List out main components of Diesel power station.
Last 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)
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105 views
1 answer
asked
Aug 2, 2019
by
anonymous
List out main components of Reactors.
Last 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
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72 views
1 answer
asked
Aug 2, 2019
by
anonymous
How rating of main switch and cable is selected for Industrial Installation.
Last 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.
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329 views
1 answer
asked
Sep 20, 2018
by
anonymous
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
Last 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 .
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143 views
2 answers
asked
May 8, 2018
by
anonymous
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
Last 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
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108 views
1 answer
asked
May 8, 2018
by
anonymous
Last 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.
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64 views
1 answer
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Mar 22, 2018
by
anonymous
Last Answer : Discrimination between main and back up protection is provided by the use of relays which are slow.
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396 views
1 answer
asked
Mar 20, 2018
by
anonymous
Last Answer : The main function of a fuse is to prevent excessive currents.
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93 views
1 answer
asked
Mar 19, 2018
by
anonymous
What is the main purpose of electroplating?
Last Answer : Protecting reactive metals from corrosion.
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114 views
1 answer
asked
Mar 11, 2018
by
anonymous
What is the main use of a transistor?
Last Answer : Main use of a transistor as amplifier and as switch.
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84 views
1 answer
asked
Mar 10, 2018
by
anonymous
What are the main causes of harmonics?
Last Answer : Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter
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177 views
1 answer
asked
Mar 10, 2018
by
anonymous
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What are the main parts of a generator?
Last Answer : the main parts of the generator are as follows yoke Armature Poles field winding Prime mover Commutator Shaft Bearings Brushes
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84 views
1 answer
asked
Dec 16, 2017
by
anonymous
Is it possible for a soil to consist only of one phase?
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1 view
0 answers
What is the operation of three phase induction motor
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6 views
0 answers
SINGLE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on (a) running winding (b) rotor winding (c) field winding (d) compensating winding Ans: a ... motor is usually reduced by using (a) gearing (b) belts (c) brakes (d) chains Ans: a
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22 views
3 answers
THREE PHASE INDUCTION MOTORS MCQ
Last Answer : 101. Insertion of resistance in the stator of an induction motor (a) increases the load torque (b) decreases the starting torque (c) increases the starting torque (d) none of the above Ans: b
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323 views
3 answers
How to Build a Static 3 Phase Converter
Last Answer : How to Build a Static 3 Phase Converter Static 3 phase converters enable offices and residents to conserve energy efficiently. In fact, electricity is available in 3 power phases, which enables ... converter and the necessary appliances that are needed in building the main and the remote appliances.
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6 views
1 answer
asked
May 12, 2021
by
anonymous
Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it.
Last Answer : Circuit Diagram: Waveforms:
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535 views
1 answer
asked
May 21, 2020
by
anonymous
State classification of Phase controlled rectifiers.
Last Answer : Classification of phase controlled rectifiers:
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105 views
1 answer
asked
May 21, 2020
by
anonymous
Single phase transformer
Last Answer : Single phase Transformer Transformer
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261 views
1 answer
asked
May 16, 2020
by
anonymous
Explain MCB and ELCB with connection diagram supplying single phase load.
Last 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.
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582 views
1 answer
asked
May 7, 2020
by
anonymous
List different starting methods of three phase synchronous motor. Explain any one of them.
Last 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.
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157 views
1 answer
asked
May 7, 2020
by
anonymous
State suitable single phase motor for following applications: (i) Table fan (ii) Mixers and Grinders
Last 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
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96 views
1 answer
asked
May 7, 2020
by
anonymous
Draw & explain operation of phase detector.
Last 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.
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127 views
1 answer
asked
May 2, 2020
by
anonymous
Explain the concept of lagging and leading phase angle by waveform.
Last 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.
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378 views
1 answer
asked
Apr 27, 2020
by
anonymous
Explain the procedure to perform Short Circuit test on single phase transformer with circuit diagram.
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113 views
0 answers
asked
Apr 27, 2020
by
anonymous
Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.
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131 views
0 answers
asked
Apr 16, 2020
by
anonymous
Explain the need and steps to conduct the reduced voltage running up test on the three phase induction motor.
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218 views
0 answers
asked
Apr 16, 2020
by
anonymous
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Why is a capacitor used in a single phase motor and not in three phase motor ?
Last 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.
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260 views
6 answers
asked
Sep 2, 2019
by
anonymous
Define Amplitude and Phase of Sinusoidal quantity.
Last 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 .
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165 views
1 answer
asked
Aug 21, 2019
by
anonymous
working principle of single phase motor
Last 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.
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168 views
1 answer
asked
Aug 21, 2019
by
anonymous
Why is a three phase denoted by R, Y, B ?
Last 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.
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250 views
2 answers
asked
Aug 18, 2019
by
anonymous
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63 views
0 answers
asked
Aug 13, 2019
by
Alacrity
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What is phase failure relay and how it's work?
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60 views
0 answers
asked
Aug 12, 2019
by
anonymous
Explain the working of a single phase capacitor start induction motor.
Last Answer : Single phase capacitor start induction motor https://youtu.be/31lvvzU5Puc
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395 views
2 answers
asked
Jul 30, 2019
by
anonymous
State any four advantages of three phase induction motor.
Last Answer : Advantages of three phase induction motor https://youtu.be/27OIOCKN05U
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137 views
2 answers
asked
Jul 30, 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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1.1k views
4 answers
asked
Jul 26, 2019
by
anonymous
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.
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885 views
1 answer
asked
Jul 25, 2019
by
anonymous
Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).
Last Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.
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195 views
1 answer
asked
Sep 22, 2018
by
anonymous
Split phase induction motor
Last Answer : Split phase induction motor : There are two windings used in split phase induction motor. It is a type of single-phase induction motor. There are two winding one is called main winding and ... motor have low starting torque it is used for small fans, blowers, centrifugal pumps, grinders etc.
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230 views
1 answer
asked
Sep 20, 2018
by
anonymous
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What is Phase sequence? Draw waveforms of 3 phase emf.
Last 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.
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125 views
1 answer
asked
Sep 7, 2018
by
anonymous
Define balanced 3 phase load.
Last Answer : Balanced 3 phase Load: Balanced three phase load is defined as star or delta connection of three equal impedances having equal real parts and equal imaginary parts. It takes same current of equal magnitude and equal phase angle.
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159 views
1 answer
asked
Sep 7, 2018
by
anonymous
With a neat sketch explain working of 1 phase dynamometer type power factor meter.
Last Answer : Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals ... becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load.
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201 views
1 answer
asked
Sep 6, 2018
by
anonymous
State the use of:- (i) Clip-on-ammeter (ii) Phase sequence indicator
Last Answer : (i) Clip-on-ammeter: used for measurement of current in cables/lines in live conditions without disconnecting them. (ii) Phase sequence indicator: To determine /find the phase sequence of 3 phase supply.
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75 views
1 answer
asked
Sep 6, 2018
by
anonymous
