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Why a dc series motor has a high starting torque?

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Why a dc series motor has a high starting torque?
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asked Mar 15, 2018 by anonymous
Why high starting torque is required?
Description :

Why high starting torque is required?

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54 views 0 answers
asked Mar 20, 2018 by anonymous
Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of?
Description :

Answer :

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of D.C. series motor.

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95 views 1 answer
asked Mar 15, 2018 by anonymous
Why does induction motor have high starting current?
Description :

Why does induction motor have high starting current?

Answer :

In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor

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122 views 2 answers
asked Mar 20, 2018 by anonymous
For the same H.P. rating and full load speed, following motor has poor starting torque?
Description :

Answer :

For the same H.P. rating and full load speed, following motor has poor starting torque differentially compounded.

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124 views 1 answer
asked Sep 13, 2017 by anonymous
which single phase induction motor has highest starting torque?
Description :

Answer :

Capacitor start motor has high torque in starting

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97 views 1 answer
asked May 8, 2018 by anonymous
In a double squirrel cage induction motor, good starting torque is produced as
Description :

In a double squirrel cage induction motor, good starting torque is produced as (A) Large current flows through the outer high resistance winding. (B) Large current flows through the inner high resistance winding. (C) Small current flows through the outer high resistance winding. (D) Large current flows through the inner low resistance winding.

Answer :

In a double squirrel cage induction motor, good starting torque is produced as Large current flows through the outer high resistance winding.

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98 views 1 answer
asked Apr 29, 2018 by anonymous
In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at
Description :

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

Answer :

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is : 0.075

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82 views 1 answer
asked Mar 15, 2018 by anonymous
Why dc series motor should not be started at no load?
Description :

Why dc series motor should not be started at no load?

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605 views 0 answers
asked Apr 24, 2020 by anonymous
DC motor gross torque example
Description :

DC motor gross torque example

Answer :

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115 views 2 answers
asked Mar 20, 2018 by anonymous
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to?
Description :

Answer :

In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to 25% of the previous value.

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164 views 1 answer
asked Mar 15, 2018 by anonymous
What are the advantages of DC series motor?
Description :

What are the advantages of DC series motor?

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asked Mar 20, 2018 by anonymous
The starting resistance of a D.C. motor is generally?
Description :

Answer :

The starting resistance of a D.C. motor is generally low.

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89 views 1 answer
asked Mar 20, 2018 by anonymous
For starting a D.C. motor a starter is required because?
Description :

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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66 views 1 answer
asked May 7, 2020 by anonymous
State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.
Description :

State the modification to be done in dc series motor to work satisfactorily as ac series motor. State applications of ac series motor.

Answer :

Modifications are necessary in a dc series motor so that it operates satisfactorily on ac supply. The modifications are as follows:  1) AC series motor is built with a few field turns as ... and grinders 5) High speed vacuum cleaners 6) Sewing machines 7) Food processors 8) Drilling machine 

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116 views 1 answer
asked Apr 21, 2020 by anonymous
Brake test on DC series motor
Description :

Brake test on DC series motor

Answer :

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184 views 2 answers
asked Sep 18, 2018 by anonymous
Describe the reason of using dc series motor for electric trains.
Description :

Describe the reason of using dc series motor for electric trains.

Answer :

Electric trains require an inverse torque speed characteristics for proper operation. That is a higher torque is required at start (when speed is nil or low) and as the train picks up ... torque - speed characteristics of DC series motors match, these motors are suitable for electric trains

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120 views 1 answer
asked Mar 20, 2018 by anonymous
Torque developed by a D.C. motor depends upon?
Description :

Answer :

Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.

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355 views 1 answer
asked Mar 20, 2018 by anonymous
A.C. series motor as compared to D.C. series motor has?
Description :

Answer :

A.C. series motor as compared to D.C. series motor has smaller brush width, less number of field turns, more number of armature turns, less air gap.

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76 views 1 answer
asked Mar 20, 2018 by anonymous
The armature torque of the D.C. shunt motor is proportional to?
Description :

Answer :

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

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104 views 1 answer
asked Mar 20, 2018 by anonymous
The ratio of starting torque to full-load torque is least in case of?
Description :

Answer :

The ratio of starting torque to full-load torque is least in case of shunt motors.

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722 views 1 answer
asked Mar 15, 2018 by anonymous
Why starter is required for starting an induction motor?
Description :

Why starter is required for starting an induction motor?

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asked Mar 20, 2018 by anonymous
The speed of a D.C. series motor is?
Description :

Answer :

The speed of a D.C. series motor is inversely proportional to the armature current.

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76 views 1 answer
asked Mar 20, 2018 by anonymous
A D.C. series motor is that which?
Description :

Answer :

A D.C. series motor is that which has its field winding consisting of thick wire and less turns.

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58 views 1 answer
asked Mar 20, 2018 by anonymous
The direction of rotation of a D.C. series motor can be changed by?
Description :

Answer :

The direction of rotation of a D.C. series motor can be changed by interchanging field terminals.

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79 views 1 answer
asked Mar 20, 2018 by anonymous
If a D.C. series motor is operated on A.C. supply, it will?
Description :

Answer :

If a D.C. series motor is operated on A.C. supply, it will spark excessively, have poor efficiency, have poor power factor.

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73 views 1 answer
asked Mar 20, 2018 by anonymous
When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
Description :

Answer :

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

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105 views 1 answer
asked Mar 20, 2018 by anonymous
A centrifugal switch is used to disconnect starting winding when motor has?
Description :

Answer :

A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

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256 views 1 answer
asked Mar 20, 2018 by anonymous
The starting winding of a single-phase motor is placed in?
Description :

Answer :

The starting winding of a single-phase motor is placed in stator.

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72 views 1 answer
asked Mar 20, 2018 by anonymous
If starting winding of a single-phase induction motor is left in the circuit, it will?
Description :

Answer :

If starting winding of a single-phase induction motor is left in the circuit, it will draw excessive current and overheat.

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205 views 1 answer
asked Mar 20, 2018 by anonymous
Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a?
Description :

Answer :

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a magnetic relay.

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177 views 1 answer
asked Mar 20, 2018 by anonymous
The value of starting capacitor of a fractional horse power motor will be?
Description :

Answer :

The value of starting capacitor of a fractional horse power motor will be 300 uF .

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82 views 1 answer
asked Mar 20, 2018 by anonymous
The rotor developed by a single-phase motor at starting is?
Description :

Answer :

The rotor developed by a single-phase motor at starting is zero.

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64 views 1 answer
asked Mar 20, 2018 by anonymous
In a capacitor start motor, the phase displacement between starting and running winding can be nearly?
Description :

Answer :

In a capacitor start motor, the phase displacement between starting and running winding can be nearly 90°.

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146 views 1 answer
asked Mar 18, 2018 by anonymous
A synchronous motor can be made self starting by providing?
Description :

A synchronous motor can be made self starting by providing?

Answer :

A synchronous motor can be made self-starting by providing damper bar.

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110 views 1 answer
asked Mar 17, 2018 by anonymous
How is a three phase cage induction motor self starting?
Description :

How is a three phase cage induction motor self starting?

Answer :

Any type of induction motor is self starting. Because the reason for torqe production require two flux displaced by some angle theta.If theta is constant with time then torqe will be constant;if ... torqe also pulsating. In induction motor this angle theta is not pulsating.so it is self starting 

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104 views 1 answer
asked May 7, 2020 by anonymous
List different starting methods of three phase synchronous motor. Explain any one of them.
Description :

List different starting methods of three phase synchronous motor. Explain any one of them.

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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77 views 1 answer
asked Mar 17, 2018 by anonymous
Is induction motor is self starting?
Description :

Is induction motor is self starting?

Answer :

Single phase induction motor is not self starting. Three phase induction motor is self starting.

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97 views 1 answer
asked Aug 25, 2019 by anonymous
Limitation and application of High Voltage DC (HVDC)
Description :

Limitation and application of High Voltage DC (HVDC)

Answer :

Limitation and application of High Voltage DC (HVDC) :  Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

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92 views 1 answer
asked Mar 20, 2018 by anonymous
An induction motor has relatively high power factor at?
Description :

Answer :

An induction motor has relatively high power factor at near full load.

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67 views 1 answer
asked May 8, 2018 by anonymous
We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance
Description :

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

Answer :

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

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122 views 1 answer
asked Apr 29, 2018 by anonymous
Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to
Description :

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be

Answer :

Torque developed by a three-phase, 400V, induction motor is 100 N -m. If the applied voltage is reduced to 200-V, the d'veloped torque will be 25 N -m

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113 views 1 answer
asked Mar 20, 2018 by anonymous
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C.?
Description :

Answer :

Speed torque characteristic of a repulsion induction motor is similar to that of a D.C. compound motor.

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87 views 1 answer
asked Mar 20, 2018 by anonymous
A synchronous motor can develop synchronous torque?
Description :

Answer :

A synchronous motor can develop synchronous torque at synchronous speed.

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91 views 1 answer
asked Mar 20, 2018 by anonymous
The maximum constant load torque under which a synchronous motor will pull into synchronism...
Description :

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

Answer :

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

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236 views 1 answer
asked Mar 20, 2018 by anonymous
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...
Description :

The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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93 views 0 answers
asked Apr 28, 2018 by anonymous
The torque developed by any 3-phase induction motor at 0.8 p.u. slip is
Description :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

Answer :

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is unstable torque

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2.9k views 1 answer
asked Mar 20, 2018 by anonymous
In repulsion motor, maximum torque is developed when?
Description :

Answer :

In repulsion motor, maximum torque is developed when brush axis is at 45° electrical to the field axis.

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77 views 1 answer
asked Mar 18, 2018 by anonymous
What is the maximum value of torque angle in synchronous motor?
Description :

What is the maximum value of torque angle in synchronous motor?

Answer :

The maximum value of torque angle in synchronous motor is 90 degrees electrical.

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955 views 1 answer
asked Mar 15, 2018 by anonymous
What can cause high amperage on a motor?
Description :

What can cause high amperage on a motor?

Answer :

High  amperage  can  result  in  a motor  when the  amount  of  load  increases. when  load  increases  , it  reduces  the  rotor  speed which  increases  the  slip  at  constant  synchronous  speed ... ,  as  a  result  more  current  shall  have  been  drawn  to  maintain  the  additional  load.

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60 views 1 answer
asked Apr 29, 2018 by anonymous
A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC
Description :

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

Answer :

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only

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620 views 1 answer
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