One of the following is used to control the speed of the motor. O a. Varying field voltage O b. Varying supply voltage. O. Varying supply current O d. Varying armature resistance
Q: 22/ What is the armature current value of the DC motor at starting of the Motor? a. less than 10…
A: To start a dc motor we need high current. As initally the volatge is very small in dc motor.
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A: In this question we will find find back emf....
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Q: A DC shunt motor with 200 Volt and 0.25 ohm armature winding resistance rotates at 1250 rpm, while…
A: Given data Vt =200V Ra=0.25 ohm Rext =6.5 ohm N1=1250 rpm Ia1= 10 A Ia2 = 6 A
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Q: 21. The armature voltage control is suitable if the d.c. machine is driven at a) Constant current b)…
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Q: Q 2) A d.c. shunt motor has the armature and field resistance is 0.012 and 50 Q, when the input…
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Q: Q2) A d.c. shunt motor has the armature and field resistance is 0.012 and 50 Q, when the input power…
A: This question belongs to electrical machine . It is based on the concept of armature power developed…
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Q: A d.c. motor connected to a 460-V supply has an armature resistance of 0.15 ohm Calculate: (a) The…
A: The detailed solution is provided below.
Q: A 230 V, 30 kW D.C. shunt motor has an efficiency of 88% when running at 1000 RPM on full load. The…
A: Given 230 V,30 KW D.C shunt motor Efficiency=88 % speed =1000 RPM Armature resistance(Ra)=0.1Ω…
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A: Power developed =Back emf ×armature current. Power developed =2π×speed×torque60
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A: Given Data V = 200 V Io = 5 a Rf = 150 ohm Ra = 0.1 ohm
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A: First we will find out losses then we will find out input power for given output power
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A: Armature current =(terminal voltage- back emf)/(armature resistance+ external resistance).
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Q: 1- What will happen if the armature current of DC motor is turned on when a = 90°?
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Q: A 440V DC shunt motor takes an armature current of 60A when its speed is 750 rpm. Determine the…
A: The solution can be achieved as follows.
Q: Find the starting current (in Ampere) of 148 V DC series motor if the armature resistance = 0.6 ohm…
A: V=148 V Armature Resistance=0.6 ohm Field Resistance=0.2 ohm
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Q: When a series dc motor is operated without a load, which of the following conditions occurs? * O The…
A: It is known that for DC series motor load decides the amount of armature current .when load of motor…
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- A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature resistance is 0.3 2 and the series field resistance is 0.1 2. Determine the resistance to be connected in series to reduce the speed to 500 rev/min with the same currentA series motor runs at 800 rev/min when the voltage is 400V and the current is 25A. The armature resistance is 0.4 ohm and the series field resistance is 0.2 ohm. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.The current drawn by 220 V dc shunt motor of armature resistance 0.5 ohm and back emf 200 V is
- A series motor runs at 800 r/min when the voltage is 400 V and the current is 25 A. The armature resistance is 0.4 ohm and the Series field resistance is 0.2 ohm. Determine the following: (a) The constant of the motor. If the speed decreases to 600 r/min,the torque increases by 32% and the field increases by 10%, determine the following: (b) The new armature current. (c) The new field current. (d) The new total resistance of the motor in ohm. (e) The additional resistance inserted in series with the motor in ohm.A dc series motor has an armature resistance of 0.06 Q and series field resistance of 0.08 Q. The motor is connected to a 400 V supply. The line current is 20 A when the speed of the machine is 1100 rpm. When the line current is 50 A and the excitation is increased to 30%, the speed of the machine in rpm is 837 RPM 938 RPM 1003 RPM O 1100 RPM A d.c. series motor takes 40 A at 220 V and runs at 800 r.p.m. If the armature and field resistance are 0.2 Q and 0.1 Q respectively and the iron and friction losses are 0.5 kW, the torque developed in the armature and the output of the motor will be 80.5 N-m , 11.57 kW 96.2 N-m, 10.63 kW 99.3 N-m, 7.82 kWQ7/ What are the advantages and disadvantages of the permanent magnets dc motors?
- Which of the following is preferred to counter the effect of armature reaction in DC machine? O Use of main pole OUse of interpoles Use of series winding O Shifting of brushesThe armature resistance of a DC motor is 0.4 2, the supply voltage is 200 V and the back e.m.f. is 198 V at full speed. The armature current isOne of the following is used to control the speed of the motor. O a. Varying field voltage O b. Varying supply voltage. O c. Varying armature resistance O d. Varying supply current
- A DC series motor having a resistance of 0.4 o and runs at 2000 rpm when connected to 250 V supply and drawing a current of 2O A. (i) What resistance must be added in order to limit the speed to 4000 rpm when armature current is 5A? Assume flux varies linearly. (ii) What resistance must be added to limit the speed to 1000 rpm when armature current is 30 A? Assume that the flux at 30 A is 20% more than that at 20A. (iii) At what speed the motor will run if it is connected directly to 250 V supply when the load is such that the current drawn is 30 A? *What are the options suits for a slip ring induction motor? (A) Slip ring induction motor has high starting torque (B) Slip ring Induction motor has a complicated construction (C) Slip ring induction motor has high efficciency (D) Slip ring induction motor has more copper loss O a. (A) and (B) O b. (A), (B) and (C) O c. (A) and (C) O d. (A), (B) and (D)discuss how the dc motor is used in washing machine