6-For 400 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo generator rated 50 MVA, 11 kV? a) 2 MJ/MVA b) 4 MJ/MVA c) 6MJ/MVA d) 8MJ/MVA
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- question Oc. 0.08 O d. 0.04 Generators using salient pole structure rotors are called turbo-alternators. Select one: O True O False Skewing of rotor conductors in a squirrel cage induction motor reduces• - 1800 pm In a two pole 3-p synchronous generator, the peak flux of rotor magnetic field is o5Tand the rotor rate of rotation is 1800 rpm. The stator windings have a surface area of 0.1 m? and there are 50 turns per Bmax : 0.5T, 0.5T coil. The machine is A-connected. A: 0-1 m? N: 50 a) What is the RMS phase and line voltage of the generator? b) Write the three stator phase voltages as functions of time.A 6 pole DC wave wound generator has 28 armature conductors with flux per pole is 23 mWb and the e.m.f generated is 64 V, then the speed of the machine is O 99.38 rps O 0.63 rps O 33.13 rps O 6.34 rps The thermocouples are suitable for temperature measurement applications in the range of 200°C to over 2000°C. Select one: O True O False
- Explain the effect of speed on the open circuit char at dc generatorA 50 Hz generator is connected to a turbine operating under a head of 3000 ft with a flow of 82 cubic ft / sec? The turbine specific speed is 3 rpm and a turbine efficiency of 82%. Determine the number of poles of the generator. 4 8 14A 3 phase AC induction motor is operating at no load. What is the power factor? Group of answer choices A) leading B) lagging C) neither leading nor lagging
- For 800 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo-generator rated 100 MVA, 11 kV?(c) (iv) A separately excited DC generator is rated at 172 kW, 430 V, 400 A and 1800 rpm. Its magnetization curve is shown in Figure Q4(c). The generator's characteristics are: RA= 0.05 RF = 2002 Radj = 0 to 300 (i) (iii) VF = 430 V NF = 1000 turns per pole Sketch an equivalent circuit of the generator with proper labels. If Radj = 63 N, and the prime mover is driving at 1500 rpm, calculate the generators' no-load terminal voltage. Calculate the terminal voltage if a 360 A load is connected to its terminal. Assuming the generator does not have compensating winding. Its armature reaction at this load is 450 A. turns. The prime mover is driving at 1500 rpm. For Q4(c)(iii), the terminal voltage is lower than no-load terminal voltage calculated from Q4(c)(ii). Investigate the adjustment of field current, IF and Radj to raise for the terminal voltage to match the no-load terminal voltage. |A 6 pole DC lap wound generator has 41 armature conductors with flux per pole is 23 mWb and the e.m.f generated is 80 V, then the speed of the machine is O 0.74 rps O 84.84 rps O 7.43 rps 84.84 rps
- 3. What are the various losses in an induction motor? On whatfactors do they depend?A 6 pole DC lap wound generator has 32 armature conductors with flux per pole is 44 mWb and the e.m.f generated is 74 V, then the speed of the machine is O 3.28 rps 0.33 rps 52.56 rps O 52.56 rps arch opA 6-pole ,3 phase , 60 cycle alternator has 12 slots per pole and four conductor per slot. The winding is 5/6 pitch. There are 2,500,000 Maxwell ( 0.025 weber ) entering the armature from each north pole, and this flux sinusoidally distributed along the air gap. The armature coils are all connected in series , The winding is wye connected. Determine the open circuit emf of the alternator.