Which of the following statement is correct according to the Wind Energy Conversion System? O a. High speed low torque shaft is connected to wind turbine O b. Blades are turned in their longitudinal axis to change the angle Ос. Number of blades increases then speed of wind turbine will increase O d. Low speed high torque shaft is connected to generator

Which of the following statement is correct according to the Wind Energy Conversion System? O a. High speed low torque shaft is connected to wind turbine O b. Blades are turned in their longitudinal axis to change the angle Ос. Number of blades increases then speed of wind turbine will increase O d. Low speed high torque shaft is connected to generator

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 17RQ

See similar textbooks

Similar questions

17.a. When the speed of a machine is the same as that of the driving motor, the easiest method of connectingthe machine and the motor is withA. chains.B. coupling.C. belts.D. gears.17.b. Regenerative braking is used on induction motors toA. decrease the speed below synchronous speed.B. decrease the actual speed to the value of synchronous speed.C. increase the speed above synchronous speedD. increase the actual speed to the value of synchronous speed
3. Two shunt generators operating in parallel given a total output of 600 A. One machine has an armature resistance of 0.02 ohm and a generated voltage of 455 V and the other an armature resistance of 0.025 ohm and a generated voltage of 460 V. Calculate the terminal voltage and the kilowatt output of each machine. Neglect field currents Subject: Electrical Machine 1
A drive train of the wind turbine includes a. Rotor b. Electric alternator c. Drive shaft and Gear box d. Hub
J-1). Which of the following are some of the data usually found on a motor nameplate? a) horsepower, speed b) voltage, frequency c) temperature rise, code letter d) all of the above J-2). The service_ factor of a motor is the permissible nameplate horsepower overload multiplier provided the motor does not exceed the temperature rise. a) true b) false J-3). The speed of a consequent-pole 3-phase squirrel-cage induction motor can be changed by electro-magnetically changing the number of poles on its stator. a) true b) false
. The stray load loss of a wound rotor induction motor can be determined byA. applying a predetermined current to the stator and subtracting the I²R loss from the input power.B. exciting the rotor with a-c voltage and driving it at synchronous speed in the opposite direction.C. driving the rotor in the normal direction by an external power source.D. measuring the total losses and adding the other losses. Note: I have doubts if it is the letter A or the letter C, can you help me in this question, thanks.
1.Choose which synchronous machine has less diameter in the structure when compared to all other structures. a.Non-Salient Pole type b.Salient Pole type c.All given choices d.Non-Cylindrical type 2.If synchronous motor takes more value of DC field current then motor receives reactive power from the power source. Select one: True False 3.A 60Hz three phase induction motor is running at a speed of 1760 rpm. The number of poles of the machine is Answer Identify test/tests is applicable only to Cylindrical type of Alternator. a.OC and SC test b.Blocked Rotor test c.All given choices d.Slip test Please give correct answer with two lines of explanation
A 1.5 hp three phase six-pole 50 Hz induction machine is running with 0.05 slip. Determine: (i) the synchronous speed in rpm. (ii) the rotor speed in rpm. (iii) the frequency of rotor current in hertz.
7.5kW,16A,380Volt.1430rpm,cosΦ=0.82 and f=50 Hz are written on the plate of a star connected ring induction motor.Find the tipping slip (the slip at which the maximum torque occurs) if the ratio between the maximum torque of the motor and the rated torque is 5.2. (Which one is the correct answer?) a)0.4808 b)0.2912 c)0.5749 d)0.0870 e)0.1941 f)0.7625 g)0.3864 h)0.6687
15) Which of the following machine will have the field winding with low value of resistance. a. DC Shunt Motor b. DC Series Motor c. Transformer d. DC Shunt Generator
Q.8 How is the speed of a consequent-pole motor changed? Select one: A. REVERSING THE CURRENT FLOW THROUGH ALTERNATE POLES B. DECREASING THE TOTAL NUMBER OF STATOR POLES C. ALL OF THE ABOVE
SOLVE THE PROBLEM, SHOW YOUR COMPLETE SOLUTION AND MAKE SURE THAT THE FINALS ANSWERS ARE IN 4 DECIMAL PLACES. A 250V shunt generator runs at 1,000 rpm at no load and delivers 8 A. The total armature and shunt field resistance are 0.20 and 2500 respectively. When loaded, the generator delivers 50 A to the load. a. Calculate the speed when loaded and the flux per pole remains constant. b. Calculate the speed when loaded and the flux per pole drops to 90% of that of no-load.
Please show your solution. A 3-phase induction motor has a 4-pole star-connected stator winding. The motor runs on a 50 Hz supply with 390 V between lines. The rotor resistance and standstill reactance per phase are 0.09 Ohm and 0.53 Ohm respectively. The ratio of the rotor to stator turns is 0.89. Calculate the torque, in Newton-meters, at 5% slip. Correct Answer: 392.11