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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307 views
1 answer
asked
May 22, 2020
by
anonymous

Why does the speed of a DC shunt motor decrease as the load increases?
Last Answer : Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.
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2.7k views
1 answer
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Jul 5, 2019
by
anonymous

Last Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.
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158 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.
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203 views
1 answer
asked
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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123 views
1 answer
asked
Mar 20, 2018
by
anonymous
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Which type of starter is used to start the DC motor?
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77 views
0 answers
asked
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

DC shunt motor
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
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140 views
2 answers
asked
Apr 23, 2020
by
anonymous

If field current is decreased in shunt dc motor, the speed of the motor (a) remains same. (b) increases. (c) decreases. (d) none of the above.
Last Answer : increases
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2.8k views
4 answers
asked
Aug 25, 2019
by
anonymous

State any four applications of DC shunt motor.
Last Answer : Applications of DC shunt motor: 1) Lathe machines 2) drilling machines 3) milling machines 4) Printing machinery 5) Paper industry 6) centrifugal and reciprocating pumps 7) blowers 8)fans
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115 views
2 answers
asked
Jul 27, 2019
by
anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be
Last Answer : A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V
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483 views
1 answer
asked
May 8, 2018
by
anonymous

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last Answer : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm
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332 views
1 answer
asked
May 3, 2018
by
anonymous

Last Answer : For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.
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168 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.
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135 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The armature torque of the D.C. shunt motor is proportional to armature current.
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210 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : As the load is increased the speed of D.C. shunt motor will reduce slightly.
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142 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.
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324 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.
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367 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : In a D.C. shunt motor, speed is independent of armature current.
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87 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.
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148 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.
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135 views
1 answer
asked
Mar 20, 2018
by
anonymous

Last Answer : D.C. shunt motors are used for driving machine tools.
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85 views
1 answer
asked
Mar 20, 2018
by
anonymous

Which type of blood pressure reading will you go with the automated or manual one?
Last Answer : Automated. Having a human do it means depending on an inconsistent measurer – the nurse taking the BP reading.
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1 answer
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Mar 2
by
anonymous

What do you call an individual cup manual coffee maker?
Last Answer : Google “Melitta single cup coffee brewer” :)
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1 answer
asked
Feb 27
by
anonymous

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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1 answer
asked
May 11, 2021
by
anonymous
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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

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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128 views
1 answer
asked
Sep 23, 2018
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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457 views
1 answer
asked
Sep 18, 2018
by
anonymous

Last Answer : Three point starter can be used for both shunt and compound motor.
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98 views
1 answer
asked
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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185 views
1 answer
asked
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
asked
Mar 20, 2018
by
anonymous

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

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

what is the difference between four point starter and three point starter?
Last Answer : The shunt connection in four point starter is provided separately form the line where as in three point starter it is connected with line which is the drawback in three point starter.
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119 views
2 answers
asked
Nov 30, 2017
by
anonymous

A 4-pole, dc shunt motor working on 250V takes a current of 2A when running at no load on 1000 rpm. Calculate its back emf and speed at load if the motor takes 51A. Armature and shunt field resistance are 0.2Ω and 250Ω respectively
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14 views
0 answers

Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.
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111 views
1 answer
asked
Mar 21, 2018
by
anonymous

7.24 Consider the finite-duration signal x(n) = {1,2,3,1} (a) Compute its four point DFT by solving explicitly the 4-by-4 system of linear equations defined by the inverse DFT formula. (b) Check the answer in part (a) by computing the four-point DFT, using its defination.
Last Answer : Handwritten Solution for Problem Number 7.24 from Digital Signal Processing 4th edition By John G. Proakis
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363 views
1 answer
asked
Sep 5, 2017
by
anonymous

Describe the operation of shunt capacitor filter with the help of circuit diagram and waveforms.
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Describe the operation of shunt capacitor filter with the help of circuit diagram and waveforms.
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66 views
0 answers
asked
Jul 23, 2019
by
anonymous

State the use of shunt and series resistance used in extension of meter.
Last Answer : Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.
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88 views
1 answer
asked
Sep 6, 2018
by
anonymous

In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line
Last Answer : In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line
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523 views
1 answer
asked
May 8, 2018
by
anonymous

Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.
Last Answer : Shunt compensation in an EHV line is used to Improve the voltage profile.
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5.3k views
1 answer
asked
May 8, 2018
by
anonymous

A shunt fault is characterized by (A) Increase in current, frequency and pf (B) Increase in current, reduction in frequency and pf (C) Increase in current and frequency, reduction in pf (D) Decrease in current and frequency
Last Answer : B
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1.0k views
2 answers
asked
Apr 28, 2018
by
anonymous

Last Answer : The function of shunt in an ammeter is to by pass the current.
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462 views
1 answer
asked
Mar 21, 2018
by
anonymous
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A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Last Answer : A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.
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178 views
1 answer
asked
Mar 21, 2018
by
anonymous
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The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?
Last Answer : The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 580 V.
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669 views
1 answer
asked
Mar 21, 2018
by
anonymous

In a shunt generator the voltage build up is generally restricted by?
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145 views
0 answers
asked
Mar 21, 2018
by
anonymous

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?
Last Answer : 200V/E2 = 1000/1200 E2= 240 V
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1.8k views
2 answers
asked
Mar 21, 2018
by
anonymous

Last Answer : The purpose of retardation test on D.C. shunt machines is to find out stray losses.
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75 views
1 answer
asked
Mar 20, 2018
by
anonymous
