Last Answer : Three point starter can be used for both shunt and compound motor.
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Mar 20, 2018
by
anonymous

Last Answer : A three point starter is considered suitable for shunt as well as compound motors.
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186 views
1 answer
asked
Mar 20, 2018
by
anonymous

State any four advantages of soft starter.
Last Answer : Advantages of soft starter: 1. Very low line voltage drops on motor operation 2. Reduced energy losses in the lines 3. System efficiency increases 4. Very smooth starting & operation 5. As ... may lead to lower MD billing. 13. Less mechanical maintenance. 14. Saving in operating costs.
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129 views
1 answer
asked
Sep 23, 2018
by
anonymous

Draw the wiring diagram of fluorescent tube. Explain the working of choke and starter.
Last Answer : Fluorescent lamp:- Operation:- When switch is ON current flows through the choke-filament no1- starter-filament no. 2- to neutral, At that time choke induces high voltage which is applied to ... at the time of starting. ii) Starter: To make and break the circuit to start the tube.
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2.8k views
1 answer
asked
Jul 30, 2019
by
anonymous

Which type of starter is used to start the DC motor?
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77 views
0 answers
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Mar 15, 2018
by
anonymous

Why starter is required for starting an induction motor?
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114 views
0 answers
asked
Mar 15, 2018
by
anonymous
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How to Replace a Starter
Last Answer : How to Replace a Starter The starter is where it all begins. Your car is just sitting there and ready to go, but it won't. A charge is supposed to be sent to the starter and then ... the battery and tighten the connection. Start the engine to make sure that all connections have been made properly.
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9 views
1 answer
asked
May 11, 2021
by
anonymous

Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter.
Last Answer : Necessity of Starter for D.C. Motor: Armature current is given by equation Ia = (V−Eb)/Ra i) If the motor is at standstill or rest, back emf Eb is zero (as Eb= ZNP/(60A), at start speed N ... . Types of D.C. motor starters: i) Two point starter ii)Three point starter iii) Four point starter
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325 views
1 answer
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May 22, 2020
by
anonymous

State function of starter and ELCB. (Earth Leakage Circuit Breaker)
Last Answer : i) Function of Starter:- 1. To prevent the high starting current OR to minimize the starting current. 2. To give supply failure protection 3. To give over load and short circuit protection ... an installation and cut off the circuit from power supply and avoid electrical shock to the person.
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459 views
1 answer
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Sep 18, 2018
by
anonymous

Last Answer : In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.
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77 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : A direct online starter is used for starting motors up to 5 H.P.
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83 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : For starting a D.C. motor a starter is required because it limits the starting current to a safe value.
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125 views
1 answer
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Mar 20, 2018
by
anonymous

What is an auto transformer starter?
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70 views
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Mar 15, 2018
by
anonymous

What is the best Arduino starter kit?
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74 views
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Mar 10, 2018
by
anonymous

State any Four lE Rules regarding electric safety.
Last Answer : lE Rules regarding electric safety: 1. IE Rule 3 : Authorization 2. IE Rule 29 : Construction and maintenance of electrical supply line and apparatus 3. IE Rule 30: Service line and apparatus on ... 26. IE Rule 60: Test for resistance of insulation 27. IE Rule 61: Connection with earth
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93 views
1 answer
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May 7, 2020
by
anonymous
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State any four advantages of LC filter.
Last Answer : 1. The choke input (LC) filter has a high output D.C voltage. 2. It has no loading effect on the rectifier and power transformer. 3. The diode does not have to carry surge currents. ... effect on the rectifier and power transformer. 7. It has better voltage regulation than that of π filter.
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460 views
1 answer
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Sep 5, 2018
by
anonymous

A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?
Last Answer : The current is 10.0A. 1ampere = 1 Coulomb per 1 second. 0.1Coulombs ÷ 0.01seconds = 10.0amperes.
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416 views
1 answer
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Jul 1, 2019
by
anonymous

How to Find a Four Leaf Clover
Last Answer : How to Find a Four Leaf Clover A four leaf clover is associated with good luck, particularly because it is rare and hard to find. A clover with four leaves is actually considered a genetic defect, ... it! You can learn more about preserving plants and flowers in this article: How to Dry Flowers.
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5 views
1 answer
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May 15, 2021
by
anonymous

Explain any four properties of Moulding sand.
Last Answer : 1. Porosity: Molten metal always contain a certain amount of dissolved gases, which are evolved when the metal freezes the molten metal coming in contact with the moist sand , generates steam or ... to the casting. Refractoriness is measured by the sinter point of the sand rather than its melting
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181 views
1 answer
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May 7, 2020
by
anonymous

List any four casting defects.
Last Answer : The various types of casting defects are as follows: 1. Gas Porosity: Blowholes, open holes, pinholes. 2. Shrinkage defects: shrinkage cavity. 3. Mold material defects: Cut and washes, ... Pouring metal defects: Cold shut, misrun, slag inclusion. Metallurgical defects: Hot tears, hot spot.
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112 views
1 answer
asked
May 7, 2020
by
anonymous

List any four materials used for pattern making
Last Answer : The various types of materials used are as follows: 1. Wood 2. Metal. 3. Plastic. 4. Plaster. 5. Wax.
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96 views
1 answer
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May 7, 2020
by
anonymous

List any four accessories used on lathe.
Last Answer : The various accessories used in lathe are as follows. 1) Lathe centers 2) Carriers or driving dog 3) catch plates 4) Chucks 5) Face plates 6) Angle plates 7) Mandrels 8) Rests
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87 views
1 answer
asked
May 7, 2020
by
anonymous
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A four -quadrant operation requires two full converters connected in (1) Series (3) Back to back (2) Parallel (4) Series Cascade
Last Answer : A four-quadrant operation requires two full converters connected in Parallel
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887 views
1 answer
asked
Apr 30, 2018
by
anonymous

What are the four basic welding positions?
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58 views
0 answers
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Mar 11, 2018
by
anonymous

Describe the basic SHA operation with the help of its four mode specifications.
Last Answer : Sample-and-hold amplifier (SHA) is a unity gain amplifier with a mode control switch where the input of the amplifier is connected to a time-varying signal. A trigger pulse at the mode control switch ... but other forms, such as optical and mechanical forms, are possible. Also denoted S/H.
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114 views
1 answer
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Mar 2, 2018
by
anonymous

Four Quadrant Operation Of DC Motor
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225 views
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Aug 9, 2017
by
anonymous

Single point Cutting tool signature
Last Answer : The shape of a tool is specified in a special sequence and this special sequence is called tool signature. The tool signature is given below (i) Back rake angle (ii) Side rake angle (iii) ... rake, end relief, side relief, end cutting edge, side cutting edge angle and 0.8 mm nose radius.
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132 views
1 answer
asked
May 7, 2020
by
anonymous

Illustrate with neat wiring diagram a single lamp control by two point method.
Last Answer : Single lamp control by two point method: This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.
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279 views
1 answer
asked
May 3, 2020
by
anonymous
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The operating point of a protective current transformer is near the
Last Answer : The operating point of a protective current transformer is near the Ankle point
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127 views
1 answer
asked
May 8, 2018
by
anonymous

Blind spot is a point in the zones of protection where
Last Answer : Blind spot is a point in the zones of protection where No protection is available.
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667 views
1 answer
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May 8, 2018
by
anonymous

If the % reactance upto the fault point is 20%, then the short circuit current will be
Last Answer : If the % reactance upto the fault point is 20%, then the short circuit current will be 5 times the full load current
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3.0k views
1 answer
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May 8, 2018
by
anonymous

Last Answer : In a load curve the highest point represents peak demand.
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109 views
1 answer
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Mar 20, 2018
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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140 views
2 answers
asked
Jul 30, 2019
by
anonymous

State any four applications of three phase circuits.
Last Answer : The application of three phase circuits are 1. Three phase circuit is used for power transmission over long distances. 2. Three phase circuit can produce rotating magnetic field 3. Three phase ... three phase Motors and Transformers. 4. Three phase circuit is used for power converters circuits.
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269 views
1 answer
asked
Aug 12, 2018
by
anonymous

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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267 views
6 answers
asked
Sep 2, 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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251 views
2 answers
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Aug 18, 2019
by
anonymous

List three important characteristics of an electric circuit.
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256 views
0 answers
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Jun 29, 2019
by
anonymous

Define balanced and unbalanced load in three phase circuit.
Last Answer : Balanced Load: When all the imedances of 3 phases are equal in magnitude and of same nature then load is said to be balanced. Unbalanced Load: When all the imedances of 3 phases are not equal in magnitude and of different nature then load is said to be unbalanced.
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267 views
1 answer
asked
Sep 6, 2018
by
anonymous

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
Last Answer : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these
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216 views
1 answer
asked
Apr 29, 2018
by
anonymous
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When three resistors with unequal values are connected in parallel, _______ A) The current across the resistors is the same B) The voltage drop across the resistors is the same C) The voltage drops across the resistors is proportional to the resistance of each resistor D) None of these
Last Answer : When three resistors with unequal values are connected in parallel, The voltage drop across the resistors is the same
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122 views
1 answer
asked
Apr 29, 2018
by
anonymous

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%
Last Answer : When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is 73.2%
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139 views
1 answer
asked
Apr 28, 2018
by
anonymous

In a three-phase supply floating neutral is undesirable because it way give rise to?
Last Answer : In a three-phase supply floating neutral is undesirable because it way give rise to unequal line voltages across the load.
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117 views
1 answer
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Mar 25, 2018
by
anonymous

What are three ways you can increase the strength of an electromagnet?
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77 views
0 answers
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Mar 14, 2018
by
anonymous

how can we reverse the direction of rotation of three phase induction motor ?
Last Answer : The direction of rotation of three phase induction motor can be reversed by plugging i.e by changing any two out of three phases of the supply to the stator of the Induction motor terminal.
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139 views
1 answer
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Oct 4, 2017
by
anonymous

Write short notes on 3 phase AC system.
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120 views
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Aug 11, 2018
by
anonymous

Is it possible for a soil to consist only of one phase?
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What is the operation of three phase induction motor
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7 views
0 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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335 views
3 answers

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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164 views
1 answer
asked
May 7, 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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152 views
0 answers
asked
Apr 16, 2020
by
anonymous
