Usually wide and sensitive speed control is desired in case of?

by

1 Answer

Answer :

Usually wide and sensitive speed control is desired in case of colliery winders.

by

Related questions

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

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

Last 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 

Which motor has the poorest speed control?

Last Answer : Series motor has the poorest speed control.

Speed control by Ward Leonard method gives uniform speed variation?

Last Answer : Speed control by Ward Leonard method gives uniform speed variation in both directions.

Speed control of a universal motor is achieved by?

Last Answer : Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

The speed control of universal motor used for sewing machines is by?

Last Answer : The speed control of universal motor used for sewing machines is by varying the resistance.

What are the speed control methods of dc motor?

Description : What are the speed control methods of dc motor?

Last Answer : Field control of DC motor Armature control of DC motor

speed control methods of three phase induction motor?

Description : speed control methods of three phase induction motor?

Last Answer : Speed control of three phase induction motor

Speed control of the motor using TRIAC

Description : Speed control of the motor using TRIAC

Last Answer : Speed control of the motor using TRIAC:  This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

In Ward-Leonard control the lower limit of speed is imposed by?

Last Answer : In Ward-Leonard control the lower limit of speed is imposed by residual magnetism of the generator.

For constant torque drive which speed control method is preferred ?

Last Answer : For constant torque drive armature voltage control speed control method is preferred.

Most sensitive galvanometer is?

Last Answer : Most sensitive galvanometer is spot ballistic galvanometer.

A sensitive galvanometer produces large deflection for a?

Last Answer : A sensitive galvanometer produces large deflection for a small value of current.

The speed of a universal motor is usually reduced by using?

Last Answer : The speed of a universal motor is usually reduced by using gearing.

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.

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will?

Last Answer : In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will run as induction motor.

The armature voltage control of D.C. motor provides?

Last Answer : The armature voltage control of D.C. motor provides constant torque drive.

Armature control of DC motor

Description : Armature control of DC motor

Last Answer : Armature control of DC motor

Field control of DC motor

Description : Field control of DC motor

Last Answer : Field control of DC motor

A differentiator is not usually used in control system, because it : -

Description : A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

Last Answer : A differentiator is not usually used in control system, because it : - increases input noise

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

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

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

The fall in speed of a dc generator due to increase in load can be corrected by

Description : The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

Last Answer : It   can  be  corrected  by  increasing  the  input  to  the  prime  mover.

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min

Description : The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

Last Answer : The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min 200 rpm

In variable speed motor?

Last Answer : In variable speed motor a weaker commutating field is needed at low speed than at high speed.

The speed of a D.C. motor can be controlled by varying

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

Last 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

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.

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.

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

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

The speed of a D.C. series motor is?

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

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

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

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.

Centrifugal switch disconnects the auxiliary winding of the motor at about what percent of synchronous speed?

Last Answer : Centrifugal switch disconnects the auxiliary winding of the motor at about 70 to 80 percent of synchronous speed.

The speed/load characteristics of a universal motor is same as that of?

Last Answer : The speed/load characteristics of a universal motor is same as that of D.C. series motor.

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

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

If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in?

Last Answer : If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in damage to the starting winding.

Did Judge Belvin Perry conduct a good trial in the Caylee Anthony Case?

Description : Did Judge Belvin Perry conduct a good trial in the Caylee Anthony Case?

Last Answer : I didn’t get to watch much of it, but from what I did get to see, he seemed to have total control of his courtroom and didn’t seem to be in it for the publicity, unlike the judge in the OJ Simpson trial

Why don't people take control of their news feeds on Facebook?

Description : Why don't people take control of their news feeds on Facebook?

Last Answer : Because some people are drama mongers, even though they claim that they hate drama. Other people want to be in the know even though they can't stand to see what some people have to say ... know how to change their settings. Some people would prefer if everybody agreed 100% with what they believe.

Explain In Brief The Control And Timing Circuitry Of The 8085.?

Description : Explain In Brief The Control And Timing Circuitry Of The 8085.?

Last Answer : Answer :The timing and control circuitry section of the 8085 is responsible for the generation of timing and control signals so that instructions can be executed. The types of signals involved ... of control signals for the executions of instructions and for the sync between external devices.

MCQ on Motor Control Center

Description : MCQ on Motor Control Center

Last Answer : 1. MCC stands for ______ a. Motor Control Center b. Motor Control Cost c. Machine Components Center d. None of the above Answer : a. Motor Control Center 2. MCC contains _____ a. Fuse b. MCB c. ... a) Start the motor b) Accelerate the motor c) Decelerate the motor d) Stop the motor Answer : a

How To Control Obesity

Description : How To Control Obesity

Last Answer : How To Control Obesity According to statistics, one in every three American adults is classified obese. Obesity is becoming a large problem in developed countries today. It increases the risk of serious ... any problem with controlling your obesity. In the end, you will benefit greatly from it.

How To Control Blood Sugar

Description : How To Control Blood Sugar

Last Answer : How To Control Blood Sugar Any person suffering from diabetes knows that maintaining blood sugar level is important to avoid complications. Blood sugar refers to the amount of glucose present in a person's blood. ... but the trade-off is more than worth the trouble. After all, the cost is your life.

How to Choose a Birth Control Method

Description : How to Choose a Birth Control Method

Last Answer : How to Choose a Birth Control Method Birth control methods depend on the couple's needs and commitment to the method. Some couples just need to prevent pregnancy while others wish to avoid sexually- ... unplanned sex, a broken condom or failure to take birth control pills two days in a row.

How to Control Weeds in Your Garden

Description : How to Control Weeds in Your Garden

Last Answer : How to Control Weeds in Your Garden Weeds are unwanted plants which grow in your garden, crops, lawn or other agricultural areas, along with the other wanted and valuable plants. They are ... which have grown into your beautiful garden and have become an obstacle in their growth and development.

Bacteria Control Tips

Description : Bacteria Control Tips

Last Answer : Bacteria Control Tips Although most micro organism in the outside world are harmless. It is necessary to realise that some pathogenic species are often mixed with non-pathogenic ones and special ... For being healthy, I hope, tips mentioned above for bacteria control definitely useful to you.

Draw the labeled block diagram of process control system and explain each block.

Description : Draw the labeled block diagram of process control system and explain each block.

Last Answer : Explanation - Process control system consists of process or plant, sensor, error detector, automatic Controller, actuator or control element. 1) Process or plant- process means some manufacturing sequence ... process which changes the process variable. Output of this block is denoted by u .

State the purpose of lighting control. List the different types of dimmer.

Description : State the purpose of lighting control. List the different types of dimmer.

Last Answer : Purpose of Lighting Control:- 1. To turn ON or OFF the lamps 2. For dimming: The dimming control permits the adjustment of lighting over a range. 3. For changing the lighting levels ... operated dimmer 6) Triac operated Dimmer 7) PWM (Pulse width modulation) Controlled technique.

Illustrate with neat wiring diagram a single lamp control by two point method.

Description : Illustrate with neat wiring diagram a single lamp control by two point method.

Last Answer : Single lamp control by two point method:  This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.

Define the following terms : (i) Base Station (ii) Control Channel (iii) Mobile Station (iv) Page

Description : Define the following terms : (i) Base Station (ii) Control Channel (iii) Mobile Station (iv) Page 

Last Answer : i) Base Station: - A fixed station in a mobile radio system used for radio communication with mobile stations. Base stations are located at the center or on the edge of a coverage region ... the page throughout the service area using base stations which broadcast the page on a radio carrier.

What are the disadvantages of Open loop control system?

Description : What are the disadvantages of Open loop control system?

Last Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

Draw and explain bulk correction method for power factor & control.

Description : Draw and explain bulk correction method for power factor & control.

Last Answer : Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95). 

State the function of following components of a nuclear power station: i) Moderator ii) Shielding iii) Control rod iv) Coolant

Description : State the function of following components of a nuclear power station: i) Moderator ii) Shielding iii) Control rod iv) Coolant 

Last Answer : i) Function of Moderator :- Moderator is to moderate or reduce the speed of fast neutron to help the fission process.  ii) Function of sheilding : Shielding is to protect environment, ... from reactor core and transfer it in heat exchanger for producing steam at high pressure and temperature.