menu search
person
thumb_up_alt 0 like thumb_down_alt 0 dislike
109 views

1 Answer

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

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

Related questions

Description :

Answer :

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

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

Answer :

The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
101 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 :

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.

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

Answer :

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

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

Answer :

Series motor has the poorest speed control.

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
120 views 1 answer
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
157 views 2 answers
Description :

speed control methods of three phase induction motor?

Answer :

Speed control of three phase induction motor

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

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

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'.

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

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

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). 

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

Write one advantage and one disadvantage each for spring control method and gravity control method.

Answer :

Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.

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

Explain spring control method with neat diagram.

Answer :

Spring Control Method: As shown in the figure the inner ends of the both springs are attahced to the spindle ,while outer end of upper spring is attached to the lever and outer end of ... the springs are twisted in opposite direction to the motion of pointer and produce controlling torque.

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

Answer :

Ward-Leonard control is basically a voltage control method.

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

Speed control of the motor using TRIAC

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.

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

Explain the lighting scheme to be designed for each of the following: i) Special ward in hospitals ii) Dentist’s Cabin 

Answer :

i) Special ward in hospital: For the patients in the wards, lighting should create a cozy and pleasant atmosphere. Lighting in the wards should be planned in such a way that it meets the specific ... we use such as cements and bonding agents that we use to restore your teeth back to health.

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

The chief advantage of Ward-Leonard system D.C. motor speed control is that is  1. Can be used even for small motors 2. has high overall efficiency at all speeds 3. Gives smooth, sensitive and wide speed control 4. Uses a flywheel to reduce fluctuations in power demand

Answer :

The chief advantage of Ward-Leonard system D.C. motor speed control is that is Gives smooth, sensitive and wide speed control 

thumb_up_alt 0 like thumb_down_alt 0 dislike
267 views 1 answer
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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
173 views 2 answers
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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
129 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
156 views 1 answer
Description :

Answer :

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

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

Answer :

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

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

Answer :

Plugging method of braking is generally used in elevators.

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
55 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
99 views 2 answers
Description :

Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

Answer :

A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance

thumb_up_alt 0 like thumb_down_alt 0 dislike
616 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
322 views 1 answer
Description :

Answer :

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

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

Answer :

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

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

Answer :

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

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

Answer :

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

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

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.

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

Answer :

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

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

Answer :

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

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

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.

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

Answer :

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

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

Answer :

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

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

Answer :

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

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

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.

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

Why the speed of synchronous motor is constant?

thumb_up_alt 1 like thumb_down_alt 0 dislike
62 views 0 answers
Description :

Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer.

Answer :

Energy conservation techniques by installation of separate transformer / servo stabilizer: The luminous efficiency of lamps depends upon the voltage applied across the terminals. It gives its best ... the voltage constant in that installation for giving best luminous efficiency of lamps.

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

With neat diagram explain calibration of energy meter by direct loading method.

Answer :

Calibration of Energy Meter by Direct Loading Method:  There are three methods for testing/calibration:  1. Long period dial test  2. Using rotary sub- standard meter  3. Using precision grade instruments  All ... of substandard meter in kWh  Then % error = [(D - DS)/DS] x 100

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

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Answer :

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

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

Answer :

Annual depreciation as per straight line method, is calculated by the capital cost minus the salvage value, is divided by the number of years of life.

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

Under constant load conditions, the speed of a d.c. motor is affected by?

Answer :

Under constant load conditions, the speed of a d.c. motor is affected by field flux.

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

Answer :

The speed of a locomotive is controlled by gear box.

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

Answer :

The speed of a universal motor is generally reduced by using gear trains.

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

Answer :

The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

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