1) . A factory load consists of the following : (i) an induction motor of 150...

1) . A factory load consists of the following :

(i) an induction motor of 150 h.p. (111·9 kW) with 0·7 p.f. lagging and 80% efficiency ;

(ii) a synchronous motor of 100 h.p. (74·6 kW) with 0·85 p.f. leading at 90% efficiency

(iii) a lighting load of 50 kW.

Find the annual electric charges if the tariff is Rs 100 per annum per kVA maximum demand plus 7 paise per kWh ; assuming the load to be steady throughout the year.

ANS[Rs 1,96,070]

2) . A hydro-electric plant has a catchment are of 120 square km. The available run off is 50% with annual rainfall of 100 cm. A head of 250 m is available on the average. Efficiency of the power plant is 70%. Find (i) average power produced (ii) capacity of the power plant. Assume a load factor of 0.6.

ANS [(i) 3266 kW (ii) 5443 kW]

Expert Solution

Manojponduru answered 1 year ago

Compare the working of an Induction motor with a synchronous motor.

A 6-pole and three-phase induction motor has synchronous speed of (1000) RPM. a) Find the no-load...

A 6-pole and three-phase induction motor has synchronous speed of (1000) RPM. a) Find the no-load and full-load operating speed of motor for the cases given, 1. 2.5Hz electrical frequency of rotor for no-load condition. 2. 6.3Hz electrical frequency of rotor for full-load condition. b) Find the speed regulation of motor by using parameters found above. c) Determine the electrical frequency of rotor under full-load condition so that speed regulation would be equal to 5%? (Electrical frequency of rotor for...

A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of...

A 6-pole, 50 Hz, 3-phase induction motor running on full load develops a useful torque of 160 Nm when the rotor emf makes 120 complete cycles per minute. The windage and friction loss is 1005.30 Watt. It is assumed; the core loss is lumped together with the windage and friction loss. The total stator loss is given to be 800 Watt. Compute: a) Shaft power output, b) The copper loss in the rotor winding,c) The input power to the motor, and d) The...

A three phase 10kW, 1700rpm, 60Hz, four poles, Y connected induction motor has a no-load speed...

A three phase 10kW, 1700rpm, 60Hz, four poles, Y connected induction motor has a no-load speed of 1750rpm. The rotational mechanical losses are constant and equal to 500W. The core losses are constant and equal to 300W. The copper losses in the stator equal to the copper losses in the rotor at full load. If the rotor resistance per phase is 0.25?, calculate the following: a.The frequency of the induced current in the rotor circuit at full load. b.The percentage...

Compare the brushed motor (DC motor) and a brushless motor (Induction Motor) in FIVE aspects.

A 400 V,50 Hz, six-pole three-phase induction motor drives a constant load of 140 N.m. The...

A 400 V,50 Hz, six-pole three-phase induction motor drives a constant load of 140 N.m. The motor has the following parameters ?1=0.294 Ω ?1=1.39 ?? ??=41 ?? ?2′=0.156 Ω ?2′=0.74 ?? 1) Starting. Calculate the following: i) Motor starting current. ii) Motor starting torque. 2) Maximum operating point. Calculate the following: i) Slip at which maximum torque is developed. ii) Maximum torque developed. 3) Steady-state operation. Calculate the following: i) Motor slip. ii) Motor speed. iii) Motor current. iv) Motor...

explain the method of starting a synchronous motor using an induction motor.

Explain the power balance in an induction motor.

Immediate!! An induction motor has the following parameters. Determine the maximum transient torque that can occur...

Immediate!! An induction motor has the following parameters. Determine the maximum transient torque that can occur when the 100 hp motor is plug reversed (sudden reversal of the excitation phase rotation). Assume the machine is running in the steady state with rated load prior to the plugging and that the load torque is constant over the interval of interest. Also assume that all three phases disconnect and connect simultaneously and that the time between opening and closing can be varied....

Question1) A motor shaft is subjected to 4 kN axial load and 2 kN radial load....

Question1) A motor shaft is subjected to 4 kN axial load and 2 kN radial load. shaft rotates 800 rpm and its roller bearing has lh=10000 hours working life.Choose the single row roller bearing .(define the diameter of shaft)(Can you assign it to the table pictures.)

Question