menu search
person
Chopper controlled DC motor
thumb_up_alt 0 like thumb_down_alt 0 dislike
166 views

1 Answer

Chopper controlled DC motor

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

image

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2) decrease progressively  (3) decrease to a minimum value at α = 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

Answer :

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

thumb_up_alt 0 like thumb_down_alt 0 dislike
225 views 1 answer
Description :

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

Answer :

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is 150/√3

thumb_up_alt 0 like thumb_down_alt 0 dislike
215 views 1 answer
Description :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Answer :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

thumb_up_alt 0 like thumb_down_alt 0 dislike
128 views 1 answer
Description :

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Answer :

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases 

thumb_up_alt 0 like thumb_down_alt 0 dislike
131 views 1 answer
Description :

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

Answer :

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

thumb_up_alt 0 like thumb_down_alt 0 dislike
148 views 1 answer
Description :

An FET is a better chopper than a BJT because it has (A) lower offset voltage (B) higher series ON resistance (C) lower input current (D) higher input impedance

Answer :

An FET is a better chopper than a BJT because it has lower offset voltage

thumb_up_alt 0 like thumb_down_alt 0 dislike
594 views 1 answer
Description :

Answer :

Yes, we can use triac in the multi-quadrant chopper.

thumb_up_alt 0 like thumb_down_alt 0 dislike
172 views 1 answer
Description :

Explain two-quadrant chopper.........

Answer :

Two quadrant chopper:  There are two semiconductor controllable switches in the two-quadrant chopper. Two quadrant type A chopper: The figure shows the type A chopper. Both the switch never turn on at ... 2 are turned on then Vo=Vs. When chopper 1 and chopper 2 are off then Vo=-Vs.

thumb_up_alt 0 like thumb_down_alt 0 dislike
368 views 1 answer
Description :

In a thyristor D.C. chopper, which type of commutation results in best performance ?

Answer :

voltage commutation

thumb_up_alt 1 like thumb_down_alt 0 dislike
1.7k views 2 answers
Description :

State at least one function and the material used for the following parts of DC Motor.

Answer :

Part Function Material Yoke -Provides mechanical support for poles -Acts as protecting cover for machine -Provides path for magnetic flux Cast Iron OR Cast Steel Field Winding - ... Pole core  Provides mechanical support to field winding. Cast Iron OR Cast Steel

thumb_up_alt 0 like thumb_down_alt 0 dislike
41 views 1 answer
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 

thumb_up_alt 0 like thumb_down_alt 0 dislike
117 views 1 answer
Description :

DC motor gross torque example

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%; }

thumb_up_alt 0 like thumb_down_alt 0 dislike
116 views 2 answers
Description :

DC shunt motor

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%; }

thumb_up_alt 0 like thumb_down_alt 0 dislike
113 views 2 answers
Description :

DC motor brake test numerical

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%; }

thumb_up_alt 0 like thumb_down_alt 0 dislike
51 views 2 answers
Description :

Brake test on DC series motor

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%; }

thumb_up_alt 0 like thumb_down_alt 0 dislike
187 views 2 answers
Description :

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.

Answer :

increases

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.0k views 4 answers
Description :

What would happen if a DC motor was supplied with AC ?

Answer :

With three phase induction motor, humming and not rotate, but if single phase universal motor like air blower, home mixture, motor run on constant speed..speed variation not possible...

thumb_up_alt 0 like thumb_down_alt 0 dislike
102 views 2 answers
Description :

State the function of following parts of DC motor : i) Yoke ii) Poles iii) Field winding iv) Commutator. 

Answer :

Function : i) Yoke: The yoke serves the following two purposes. i) It supports the other components such as poles and provides mechanical protection for whole machine. ii) It forms a part of ... one pole to another and thus to help the motor to develop a continuous and unidirectional torque  

thumb_up_alt 0 like thumb_down_alt 0 dislike
142 views 1 answer
Description :

State any four applications of DC shunt motor.

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
84 views 2 answers
Description :

Why does the speed of a DC shunt motor decrease as the load increases?

Answer :

Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.6k views 1 answer
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

thumb_up_alt 0 like thumb_down_alt 0 dislike
120 views 1 answer
Description :

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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
319 views 1 answer
Description :

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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
193 views 1 answer
Description :

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor :  (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

Answer :

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : can be operated in first & fourth quadrants

thumb_up_alt 0 like thumb_down_alt 0 dislike
195 views 1 answer
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

thumb_up_alt 0 like thumb_down_alt 0 dislike
83 views 1 answer
Description :

The function of a brush and commutator arrangement in a dc motor is to  (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

Answer :

The function of a brush and commutator arrangement in a dc motor is to produce unidirectional torque

thumb_up_alt 0 like thumb_down_alt 0 dislike
1.7k views 1 answer
Description :

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

Answer :

In a DC motor, it is important to place the brushes along Magnetic Neutral Axis

thumb_up_alt 0 like thumb_down_alt 0 dislike
72 views 1 answer
Description :

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

Answer :

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians Armature amp-conductors × (1/8 - θ/360o)

thumb_up_alt 0 like thumb_down_alt 0 dislike
84 views 1 answer
Description :

In DC motor iron losses are occurred in?

Answer :

In DC motor iron losses are occurred in the armature.

thumb_up_alt 0 like thumb_down_alt 0 dislike
118 views 1 answer
Description :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
64 views 0 answers
Description :

What are the advantages of DC series motor?

thumb_up_alt 0 like thumb_down_alt 0 dislike
83 views 0 answers
Description :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
605 views 0 answers
Description :

Why a dc series motor has a high starting torque?

thumb_up_alt 0 like thumb_down_alt 0 dislike
69 views 0 answers
Description :

What is the RPM of a DC motor?

thumb_up_alt 0 like thumb_down_alt 0 dislike
55 views 0 answers
Description :

What is the principle of DC motor?

thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 0 answers
Description :

What is the back EMF of a dc motor?

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.6k views 0 answers
Description :

Why DC motor is used for traction?

thumb_up_alt 0 like thumb_down_alt 0 dislike
71 views 0 answers
Description :

What are the speed control methods of dc motor?

Answer :

Field control of DC motor Armature control of DC motor

thumb_up_alt 3 like thumb_down_alt 0 dislike
156 views 2 answers
Description :

Answer :

Fleming's left hand rule.

thumb_up_alt 1 like thumb_down_alt 0 dislike
94 views 1 answer
Description :

Answer :

Induction motor is a AC motor it is also known as asynchronous motor .

thumb_up_alt 1 like thumb_down_alt 0 dislike
79 views 1 answer
Description :

Armature control of DC motor

Answer :

Armature control of DC motor

thumb_up_alt 0 like thumb_down_alt 0 dislike
141 views 2 answers
Description :

Field control of DC motor

Answer :

Field control of DC motor

thumb_up_alt 0 like thumb_down_alt 0 dislike
97 views 2 answers
Description :

Separately Excited DC motor

Answer :

Separately Excited DC motor

thumb_up_alt 0 like thumb_down_alt 0 dislike
308 views 2 answers
Description :

Four Quadrant Operation Of DC Motor

Answer :

Four Quadrant Operation Of DC Motor

thumb_up_alt 0 like thumb_down_alt 0 dislike
214 views 1 answer
Description :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

Answer :

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is 9 V

thumb_up_alt 0 like thumb_down_alt 0 dislike
121 views 1 answer
Description :

A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is  (a) First (b) Second (c) Third (d) Fourth

Answer :

A step-down chopper, fed from a 120 volt DC source, operates a DC motor whose armature e.m.f. and armature resistance are 100 volt and 0.5Ω respectively. With the magnitude control ratio 0.6, the quadrant of operation DC motor is First

thumb_up_alt 0 like thumb_down_alt 0 dislike
103 views 1 answer
Description :

A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% the power return to the DC supply is  (a) 78 kW (b) 58 kW (c) 38 kW (d) 48 kW

Answer :

A DC chopper is used for regenerative braking of a separately excited DC motor. The DC supply voltage is 400V. The armature current during regenerative braking is kept constant at 300 A with negligible ripple. For a duty cycle of 60% the power return to the DC supply is  48 kW

thumb_up_alt 0 like thumb_down_alt 0 dislike
121 views 1 answer
Description :

separately excited dc motor controlled by chopper with a frequency of 500hz and source voltage of 230v and rated value of motor is 220v 24A 100 rpm find its duty ratio at 1.2 times rated torgue and 500rpm

thumb_up_alt 0 like thumb_down_alt 0 dislike
86 views 0 answers
Description :

Explain the necessity of starter for D.C. motor. State various types of D.C. motor starter. 

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
105 views 1 answer
Description :

A d.c. motor can be looked upon as d.c. generator with the power flow?

Answer :

A d.c. motor can be looked upon as d.c. generator with the power flow reversed.

thumb_up_alt 0 like thumb_down_alt 0 dislike
3.1k views 1 answer
editAsk a Question
...