A centre zero ammeter connected in the rotor circuit of a 6-pole 50 Hz induction motor makes 30 oscillations in one minute. The rotor speed is a) 970 c) 1010 b) 990 d) 1030

Q: An electric motor with a power factor less than 1 and lagging has a reactive power component a)…

A: Power factor<1 Lagging power factor

Q: In Electrodynamometer type wattmeter, the operating torque is produced by a moving coil O a…

A: The electrodynometer type Watt is used to measure the power of a circuit. Sometime it is used to…

Q: A 3-phase induction motor has 8 poles and the operating frequency is 50HZ. The synchronous speed…

A: 3-Phase induction machine- When three-phase stator displaced by 120' is supplied by 3-phase current…

Q: Difference in 1 phase induction motor and 3 phase induction motor

A:

Q: 45. A 3-phase, 5 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitors is connected in…

A: Given: A 3-phase, 5 kW induction motor has, Power factor, cosϕ1=0.75 lagging…

Q: A sine wave has a maximum value of 230 V. What is the voltage after 38 degree rotation?

A:

Q: Explain how you can calculate the RPM of a brushed electric fuel pump motor using the waveform on an…

A: The amount of revolutions a rotating object makes in a minute is known as RPM (Revolutions per…

Q: A 4 pole 50Hz induction motor operates witha rotor speed of 1440 rpm. The percentage slip is

A: Given : Pole= 4  f=50 HZ  Nr=1440 rpm

Q: The rotor resistance of the three phase induction motor is not affected by of the supply.

A: Rotor resistance shows copper losses in the rotor circuit .it will not depend any circuit parameter.…

Q: The synchronous speed of a four-pole induction motor operating at 50Hz is A 25 rps B C D 40 rps 35…

A: Given Data:-Pole=P=4frequency=f=50Hz

Q: A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor.…

A: Given that voltmeter is connected to rotor of induction motor and gives 120 oscillations per minute.…

Q: When a current of 1A flows in a coil the flux linking with the coil is 70 µWb. If the coil…

A: The data given in the question are: I=1A, ϕ=70μWb, L=850mH The value of inductance in terms of flux,…

Q: At stand still condition the slip of the induction machine is 1 0 Infinite value none

A: Given, The induction machine is at standstill.

Q: A 3-phase induction motor has 4 poles and the operating frequency is 55HZ. The synchronous speed…

A: In this we will find synchronous speed..

Q: If the voltage is 400v its 3 phase its frequency is 50hz it has 4 poles per phase its running speed…

A: Step 1:

Q: A pump station uses an induction motor that requires a complex power of S1 = 55<30° kVAand a…

A:

Q: If the copper loss in the stator is 1.4 kilowatts, the loss in the core is 1.6 kilowatts, and the…

A: Given, Number of poles, P=6 Input power to motor, Pin=48 Kw Copper losses, Pcu=1.4 Kw Core losses,…

Q: If a 16 m/s wind is blowing on a wind turbine and the tips of its blades are rotating at 60 m/s.…

A: tip speed ratio =  speed of blade/ wind speed  speed of blade = 60m/s wind speed = 16 m/s

Q: A two-pole alternator is running at 1,500 rpm. Its angular velocity will be

A: Given: A two pole alternator is running at, Synchronous speed, Ns=1500 rpm

Q: If the resistance of the field winding of a dc generator is increased the output voltage will data…

A:

Q: A 3-phase induction motor runs at 3% slip and develops mechanical power equal to 10 kW. The air gap…

A: In this question,  We need to determine the air gap power of the induction motor?  Here slip s= 3% =…

Q: Question 5 A synchronous generator has 6 poles. Determine the speed of the steam turbine driving it…

A:

Q: A 3-phase induction motor runs at 3% slip and develops mechanical power equal to 10 kW. The air gap…

A:

Q: it is the non-stationary part of an AC motor.

A: Given: AC motor

Q: The voltage at induction motor rotor oscillates 180 times per minute. The stator frequency is 60 Hz.…

A: Given, Rotor oscillates 180 times per minute. Rotor frequency, f'=18060=3 Hz. Stator frequency, f=60…

Q: (TRU Three phase induction motor is a self- starting motor.

A:

Q: In experiment 5, the terminal voltage of the generator increases with in load.

A: Terminal volatge of dc generator increases  with decrease in the load.

Q: A 3-phase induction motor runs at 3% slip and develops mechanical power equal to 10 kW. The air gap…

A: Given, A 3-phase induction motor runs at, Slip, s = 3 % = 0.03 Mechanical power, Pm=10 kW

Q: A 90 MW, 11 kV generator has an inertia constant H = 3s. The stored energy in the rotor at…

A: Given data:S = 90 MW,H = 3sV=11 kVRequired information:

Q: A 3-phase induction motor has 8 poles and the operating frequency is 55Hz. The synchronous speed…

A: By using speed formula in terms of frequency and no. poles we can easily calculate speed

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.