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No load test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D rotor reactance
1 5292Short circuit test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D stator reactance
2 6537Auto transformer starter gives the same effect as star/delta strater if its turn ratio = A 0.5 B 0.67 C o.66 D 0.577
1 3918Rotor resistance starter is used to obtain= A increased starting torque B decrease starting current C decrease starting loss D increase efficiency
1 2853Plugging is a phenomenon to= A braking the motor B to accelerate the motor C to run IM as generator D to start the motor
3149During regenerative breaking= A rotating magnetic field is reversed B slip is positive C torque is positive D slip is negative
2169In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring
201829 Which of the following breaking method save energy? A regenerative breaking B plugging C dynamic breaking D none of above
1 3922Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
3 6479Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
2098An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm
2368An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%
2021An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor frequency at maximum torque point is A 3.33% B 4.44% C 5.55% D 6.66%
1 3878In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree
1 5410Post New Electrical Engineering Questions
what is earthing transformer? draw the winding dia.of earthing transformer.
why do we carry out winding resistance test?
A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram
2 v/500amp/hr to 1.80vpc at 20 degree celsious 2v/5ooamp/hr to 1.75 vpc at 77degree farren .this is the capacity of a battery .what is the meaning of this . can i get a detailed explenation
Is the theorem applicable to ac sources?
How will you define capacitance?
What is milivolt dop test in Busducts? What is its significance & procedure to do the test?
can u describe the method used for protection of transmission line.
How many lightning arrestors to be installed on 50MX60MX10M building and is there any formular for that?
to hook up ten 50 amp rv pedastels at a lenth of 600 feet from the service what size will my service need to be and the size of wire will I have to run to each pedastel in series??????
how to find the multiplication factor for digital energy meter and analog energy meter
how much UPS neutral erath leakage current.
what are the principles of a booster converter?
What is the use of oil in transformers?
define displacement & magnitude ?
