In a manual shunt motor starter?

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asked Mar 20, 2018 by anonymous

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asked May 22, 2020 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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80 views 1 answer

asked Jul 5, 2019 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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2.5k views 1 answer

asked Mar 20, 2018 by anonymous

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?

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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99 views 1 answer

asked Mar 20, 2018 by anonymous

If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will?

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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111 views 1 answer

asked Mar 20, 2018 by anonymous

For starting a D.C. motor a starter is required because?

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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62 views 1 answer

asked Mar 15, 2018 by anonymous

Which type of starter is used to start the DC motor?

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asked Mar 15, 2018 by anonymous

Why starter is required for starting an induction motor?

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asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?

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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169 views 1 answer

asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, speed is?

Last answer: In a D.C. shunt motor, speed is independent of armature current.

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60 views 1 answer

asked Aug 25, 2019 by anonymous

If field current is decreased in shunt dc motor, the speed of the motor

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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1.4k views 4 answers

asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

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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219 views 1 answer

asked May 3, 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

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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169 views 1 answer

asked Mar 20, 2018 by anonymous

For a D.C. shunt motor if the excitation is changed?

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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117 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a D.C. shunt motor can be increased by?

Last answer: The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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88 views 1 answer

asked Mar 20, 2018 by anonymous

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?

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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144 views 1 answer

asked Mar 20, 2018 by anonymous

The speed of a D.C. shunt motor more than its full-load speed can be obtained by?

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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90 views 1 answer

asked Mar 20, 2018 by anonymous

If the field of a D.C. shunt motor gets opened while motor is running?

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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92 views 1 answer

asked Apr 23, 2020 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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108 views 2 answers

asked Jul 27, 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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79 views 2 answers

asked Mar 20, 2018 by anonymous

The armature torque of the D.C. shunt motor is proportional to?

Last answer: The armature torque of the D.C. shunt motor is proportional to armature current.

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86 views 1 answer

asked Mar 20, 2018 by anonymous

As the load is increased the speed of D.C. shunt motor will?

Last answer: As the load is increased the speed of D.C. shunt motor will reduce slightly.

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105 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. shunt motors are used for driving?

Last answer: D.C. shunt motors are used for driving machine tools.

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68 views 1 answer

asked Mar 20, 2018 by anonymous

A three point starter is considered suitable for?

Last answer: A three point starter is considered suitable for shunt as well as compound motors.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

A direct online starter is used for starting motors?

Last answer: A direct online starter is used for starting motors up to 5 H.P.

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59 views 1 answer

asked Mar 21, 2018 by anonymous

A cumulatively compounded long shunt generator when operating as a motor would be?

Last answer: A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

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78 views 1 answer

asked Jul 30, 2019 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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2.5k views 1 answer

asked Sep 23, 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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106 views 1 answer

asked Sep 18, 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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369 views 1 answer

asked Mar 20, 2018 by anonymous

Three point starter can be used for?

Last answer: Three point starter can be used for both shunt and compound motor.

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64 views 1 answer

asked Mar 15, 2018 by anonymous

What is an auto transformer starter?

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asked Mar 10, 2018 by anonymous

What is the best Arduino starter kit?

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60 views 0 answers

asked Nov 30, 2017 by anonymous

what is the difference between four point starter and three point starter?

Last answer: The only difference is in the NO VOLT COIL connection in the starter, in three point starter NVC is connected to the field whereas in four point starter it is connected separately. The advantage of using ... (for above rated speed) and lead to DEENERGISE the NVC leading to turning off of the motor.

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87 views 1 answer

asked Mar 21, 2018 by anonymous

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm...

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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281 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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126 views 0 answers

asked Sep 5, 2017 by anonymous

Problem Number 7.24 from Digital Signal Processing 4th edition By John G. Proakis

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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273 views 1 answer

asked Jul 23, 2019 by anonymous

Use of shunt reactor in substation

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54 views 0 answers

asked Sep 6, 2018 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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53 views 1 answer

asked May 8, 2018 by anonymous

In which of the following transmission lines, the value of the Shunt admittance should be

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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445 views 1 answer

asked May 8, 2018 by anonymous

Shunt compensation in an EHV line is used to

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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4.1k views 1 answer

asked Mar 21, 2018 by anonymous

The function of shunt in an ammeter is to?

Last answer: The function of shunt in an ammeter is to by pass the current.

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254 views 1 answer

asked Mar 20, 2018 by anonymous

In case of D.C. shunt motors the speed is dependent on back e.m.f. only because?

Last answer: In case of D.C. shunt motors the speed is dependent on back e.m.f. only because flux is practically constant in D:C. shunt motors.

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145 views 1 answer

asked Mar 20, 2018 by anonymous

In D.C. shunt motors as load is reduced?

Last answer: In D.C. shunt motors as load is reduced the speed will remain almost constant.

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52 views 1 answer

asked Apr 28, 2018 by anonymous

A shunt fault is characterized by

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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587 views 2 answers

asked Mar 21, 2018 by anonymous

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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126 views 1 answer

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...

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: 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 240 V.

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1.2k views 1 answer

asked Mar 26, 2018 by anonymous

In a d.c. motor, the mechanical output power actually comes from?

Last answer: In a d.c. motor, the mechanical output power actually comes from electrical input power.

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558 views 1 answer

asked Mar 26, 2018 by anonymous

In a d.c. motor, unidirectional torque is produced with the help of?

In a d.c. motor, unidirectional torque is produced with the help of

Last answer: Commutator provides unidirectional torque and pulsating dc

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245 views 1 answer

asked Mar 20, 2018 by anonymous

In a differentially compounded D.C. motor, if shunt field suddenly opens?

Last answer: In a differentially compounded D.C. motor, if shunt field suddenly opens the motor will first stop and then run in opposite direction as series motor.

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70 views 1 answer

asked Mar 20, 2018 by anonymous

The purpose of retardation test on D.C. shunt machines is to find out?

Last answer: The purpose of retardation test on D.C. shunt machines is to find out stray losses.

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58 views 1 answer

asked Mar 20, 2018 by anonymous

Shunt capacitance is neglected while considering?

Last answer: Shunt capacitance is neglected while considering short transmission line.

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61 views 1 answer

anonymous · Answer 1 · 2018-03-20T21:18:53+0000

In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.

In a manual shunt motor starter?

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