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

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

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

## Related questions

Description : 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.

Last Answer : If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.

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

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

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

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) ... proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Last 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

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

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

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.

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

Description : A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to  (A) 0.75 p.u (B) 0.5 p.u (C) 0.25 p.u (D) 0.125 p.u

Last Answer : A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to 0.5 p.u

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.

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

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

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

Last Answer : Series motor has the poorest speed control.

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

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

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

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

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

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.

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

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

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.

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

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

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

Description : If we change the excitation of synchronous machine will it affect on motor speed?

Last Answer : No, If we change the excitation of synchronous machine it will not affect on motor speed.

Description : An electric motor in which both stator field and rotor rotates with same speed is called?

Last Answer : An electric motor in which both stator field and rotor rotates with same speed is called synchronous motor.

Description : Synchronous motor always runs at which speed?

Last Answer : Synchronous motor always runs at synchronous speed.

Description : The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

Last Answer : Ns         equals        f/pair pole 50/4      - 12.5

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

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

Description : speed control methods of three phase induction motor?

Last Answer : Speed control of three phase induction motor

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.

Description : Is there a high speed camcorder for under \$500?

Last Answer : Its not really a camera as such , it’s rate is 120fps or its 150fps and would cost a heck of alot less than \$500. Lg Renoir ok its a mobile phone but it has what you want . Holds 32Gb card

Description : If the load current and flux of a d.c. motor are held constant and voltage applied across its armature is increased by 10 per cent, its speed will?

Last Answer : If the load current and flux of a d.c. motor are held constant and voltage applied across its armature is increased by 10 percent, its speed will increase by about 10 percent.

Description : With the increase in load on a d.c. shunt motor, speed of the motor (a) increases proportionately (b) remains constant (c) increase slightly (d) reduces slightly

Last Answer : With the increase in load on a d.c. shunt motor, speed of the motor reduces slightly.

Description : The dc motor, which can provide zero speed regulation at full load without any controller is  (A) series (B) shunt (C) cumulative compound (D) differential compound

Last Answer : The dc motor, which can provide zero speed regulation at full load without any controller is shunt

Description : When load is removed, .......... motor will run at the highest speed.

Last Answer : When load is removed, series motor will run at the highest speed.

Description : If load on a d.c. shunt motor is increased, its speed is decreased due primarily to?

Last Answer : If load on a d.c. shunt motor is increased, its speed is decreased due primarily to decrease in back e.m.f.

Description : Under which of the following conditions is a DC motor provided with compensating winding used?  1. Wide range of speed control above normal  2. Wide range of steady load variation with no speed control  3. Wide range of rapid variation in ...  (a) 1, 2 and 3 (b) 2 and 3 (c) 1 and 2 (d) 1 and 3

Last Answer : Under which of the following conditions is a DC motor provided with compensating winding used?  1. Wide range of speed control above normal  2. Wide range of steady load variation with no speed control  3. Wide range of rapid variation ...  (a) 1, 2 and 3 (b) 2 and 3 (c) 1 and 2 (d) 1 and 3

Description : If the math was easier then could we have a speed limit on automobile acceleration?

Last Answer : Our test cars had numerous g sensors to measure acceleration. It was fun. It was also possible to calculate it on the fly. You can do it yourself with a cheap, used, mechanical, air craft angle of attack meter. You can get them for \$5–10 at army surplus stores. 45 degrees means 1 g.

Description : What would a keyboard built for speed be like?

Last Answer : That would be the Dvorak keyboard, patented in 1936. It has its fans, but it has never caught on.

Description : Should fast acceleration be included in the speed limit?

Description : Can we put speed limits for cars based on a mathematical fourmula?

Last Answer : All roads have a base design speed. We could start with that and adjust up or down depending upon the driver. I’d also put driver’s reaction time into the equation. It’s not practical, but I like it.

Description : Instead of top speed can police ticket for fast acceleration?

Last Answer : answer:Technically, probably not. Realistically? Yes, they could cite you for unsafe driving. For example in the US the yellow speed signs (like on highway ramps) are suggested speeds, not lawfully mandated speeds. ... get a ticket for going 60 in a 45, but you can get a ticket for unsafe driving.

Description : What is the top speed of the fastest helicopter?

Last Answer : “The current World Helicopter Speed Record is held by the Westland Lynx at 217.5 Kts (402 km/h) using specially designed high-speed rotor blades.” I just googled that.

Description : What is the maximum speed that human joints can handle?

Last Answer : It’ll be different for everyone within a certain range. Usain Bolt holds the record at 27.44mph

Description : What is the top speed for a space probe now and in the future?

Last Answer : answer:Currently Helios 2 is the fastest spacecraft ever built-the Helios 2 probe, launched in 1976 to monitor the sun-attained a top speed of 157,000 miles an hour. At that rate, a spacecraft ... from National Geograhic's web article. Future sky is the limit maybe approaching the speed of light.