1. The ferrite cores are used for ____________ transformers. A. Small transformers B. Medium transformers C. Large transformers D. Medium and small transformers 2. A 2-pole, 3-phase, 50 Hz induction motor is operating at a speed of 400 rpm. The frequency of the rotor current of the motor in Hz is __________ A. 43.33 …
1. Swinburne’s test can be conducted on ___________ A. Series motor B. Shunt motor C. Compound motor D. Shunt and compound motor 2. The generated e.m.f from 20-pole armature having 800 conductors driven at 30 rev/sec having flux per pole as 60 mWb, with 16 parallel paths is ___________ A. 1900 V B. 1840 …
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1. Swinburne’s test can be conducted on ___________ A. Series motor B. Shunt motor C. Compound motor D. Shunt and compound motor 2. The generated e.m.f from 20-pole armature having 800 conductors driven at 30 rev/sec having flux per pole as 60 mWb, with 16 parallel paths is ___________ A. 1900 V B. 1840 …
1. A three-phase slip ring induction motor is fed from the rotor side with the stator winding short-circuited. The frequency of the current flowing in the short-circuited stator is ____________ A. Slip frequency B. Supply frequency C. The frequency corresponding to rotor speed D. Zero 2. An 8-pole, 3-phase, 50 Hz induction motor is …
1. The direct axis is taken along ________ A. Inter-polar axis B. Rotor pole axis C. In between interpolar and rotor axis D. Parallel to the interpolar axis 2. A 4-pole, 3-phase, 60 Hz induction motor is operating at a speed of 1500 rpm. The frequency of the rotor current of the motor in …
1. Calculate the frequency of the waveform x(t)=45sin(40πt+5π). A. 24 Hz B. 27 Hz C. 23 Hz D. 20 Hz 2. The generated e.m.f from 16-pole armature having 57 turns driven at 78 rev/sec having flux per pole as 5 mWb, with lap winding is ___________ A. 44.16 V B. 44.15 V C. 44.46 …
1. Calculate the frequency of the waveform x(t)=45sin(40πt+5π). A. 24 Hz B. 27 Hz C. 23 Hz D. 20 Hz 2. The generated e.m.f from 16-pole armature having 57 turns driven at 78 rev/sec having flux per pole as 5 mWb, with lap winding is ___________ A. 44.16 V B. 44.15 V C. 44.46 …
1. Calculate the time period of the waveform y(t)=74cos(81πt+π). A. .024 sec B. .027 sec C. .023 sec D. .025 sec 2. The generated e.m.f from 42-pole armature having 74 turns driven at 64 rev/sec having flux per pole as 21 mWb, with wave winding is ___________ A. 4177.171 V B. 4177.152 V C. …
1. Calculate the time period of the waveform y(t)=74cos(81πt+π). A. .024 sec B. .027 sec C. .023 sec D. .025 sec 2. The generated e.m.f from 42-pole armature having 74 turns driven at 64 rev/sec having flux per pole as 21 mWb, with wave winding is ___________ A. 4177.171 V B. 4177.152 V C. …
1. In DC chopper, the waveform for input and output voltages is respectively __________ A. Discontinuous and Continuous B. Continuous and Discontinuous C. Both continuous D. Both discontinuous 2. A chopper behaves as a __________ A. DC equivalent of AC switching device B. DC equivalent of AC transformer C. DC equivalent of AC relay …
