D.C. shunt motors are used for driving?

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asked Mar 20, 2018 by anonymous

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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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146 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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53 views 1 answer

asked Mar 20, 2018 by anonymous

Starters are used with D.C. motors because?

Last answer: Starters are used with D.C. motors because to restrict armature current as there is no back e.m.f. while starting.

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60 views 1 answer

asked Mar 20, 2018 by anonymous

Why are the D.C. motors preferred for traction applications?

Last answer: The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.

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100 views 1 answer

asked Mar 20, 2018 by anonymous

During rheostat braking of D.C. series motors?

Last answer: During rheostat braking of D.C. series motors motor is run as a generator.

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62 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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103 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

When two D.C. series motors are connected in parallel, the resultant speed is?

Last answer: When two D.C. series motors are connected in parallel, the resultant speed is normal speed.

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305 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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126 views 1 answer

asked Apr 29, 2018 by anonymous

Stepper motors are used in

Stepper motors are used in (1) printers (2) lifts (3) amplifiers (4) oscillators

Last answer: Stepper motors are used in printers

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46 views 1 answer

asked Mar 15, 2018 by anonymous

What are the five types of single phase motors used in the industry?

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66 views 0 answers

asked May 8, 2018 by anonymous

A relay used for protection of motors against overload is :

A relay used for protection of motors against overload is : (A) Impedance relay (B) Electromagnetic attraction type (C) Thermal relay (D) Buchholz's relay

Last answer: A relay used for protection of motors against overload is : Thermal relay

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236 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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2.6k views 1 answer

asked Mar 20, 2018 by anonymous

In case of conductively compensated D.C. series motors, the compensating winding is provided?

Last answer: In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.

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71 views 1 answer

asked Mar 20, 2018 by anonymous

Differentially compound D.C. motors can find applications requiring?

Last answer: Differentially compound D.C. motors can find applications requiring low starting torque.

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57 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

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 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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88 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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106 views 1 answer

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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173 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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62 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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91 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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94 views 1 answer

asked Sep 3, 2019 by anonymous

Why are DC motors used in trains and not AC motors ?

Last answer: The reason is torque. torque is inversely proportional to speed..i.e when th knowe train comes to rest position to motion.. initial speed is zero..so it requires high starting torque for ... current will flow through field and armature coils then maximum torque is available at the intial condition.

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138 views 1 answer

asked Mar 20, 2018 by anonymous

The capacitors used in single-phase capacitor motors have no?

Last answer: The capacitors used in single-phase capacitor motors have no polarity marking.

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105 views 1 answer

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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54 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 15, 2018 by anonymous

Why shunt capacitor is used?

Last answer: To improve voltage at receiving end and power factor

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63 views 1 answer

asked Mar 20, 2018 by anonymous

The wattage of motor for driving domestic sewing machine will be around?

Last answer: The wattage of motor for driving domestic sewing machine will be around 100 to 150 W.

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76 views 1 answer

asked Mar 22, 2018 by anonymous

The voltage used for suburban trains in D.C. system is usually?

Last answer: The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

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64 views 1 answer

asked Mar 20, 2018 by anonymous

The type of D.C. motor used for shears and punches is?

Last answer: The type of D.C. motor used for shears and punches is cumulative compound D.C. motor.

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101 views 1 answer

asked Apr 29, 2018 by anonymous

Which of the following motors can run on both AC and DC?

Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

Last answer: Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

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113 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 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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1.5k views 4 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 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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225 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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171 views 1 answer

asked Mar 20, 2018 by anonymous

In D.C. machines fractional pitch winding is used?

Last answer: In D.C. machines fractional pitch winding is used to reduce the sparking.

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302 views 1 answer

asked Mar 19, 2018 by anonymous

D.C. shunt relays are made of?

Last answer: D.C. shunt relays are made of many turns of thin wire.

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2.6k views 1 answer

asked Mar 20, 2018 by anonymous

For which types of D.C. motor, dynamic braking is generally used ?

Last answer: Shunt motors, Series motors, Compound motors

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66 views 1 answer

asked Mar 20, 2018 by anonymous

In a manual shunt motor starter?

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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47 views 1 answer

asked May 25, 2018 by anonymous

Retardation test on d.c. shunt motors is performed for

Retardation test on d.c. shunt motors is performed for (a) frictional losses (b) stray losses (c) copper losses (d) iron loss

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33 views 0 answers

asked Apr 29, 2018 by anonymous

In a dc machine, interpoles are used to

In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Last answer: In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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74 views 1 answer

asked Mar 11, 2018 by anonymous

Why DC motor is used for traction?

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67 views 0 answers

asked Aug 17, 2019 by anonymous

State which electric motors are generally used in electro agro systems with reason.

Last answer: 1) 3 phase induction motor is used in electro agro system for water pumping from wells as 3 phase ac supply is easily available, cost of induction motor is less, maintenance free being rugged ... as 1 phase ac supply is easily available for domestic purpose, repair is simple and easily available.

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66 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 Jul 30, 2019 by anonymous

What are the factors to be considered while selection of motors for different drives?

Last answer: Following Factors are considered while selecting electric drive (Motor) for particular application: Factors to be considered for selection of Electrical Drives: 1) Nature of Supply:- Whether supply ... , load equalization 7) Cost: - Capital, Running and maintenance cost should be less.

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66 views 1 answer

asked Mar 20, 2018 by anonymous

As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for?

Last answer: As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for sound equipment.

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90 views 1 answer

asked Mar 20, 2018 by anonymous

The standard full-load power factor ratings for synchronous motors are?

Last answer: The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

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66 views 1 answer

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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81 views 1 answer

anonymous · Answer 1 · 2018-03-20T21:18:00+0000

answered Mar 20, 2018 by anonymous

D.C. shunt motors are used for driving machine tools.

D.C. shunt motors are used for driving?

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