Description : From which material field coils of DC generator are made of?
Last Answer : Field coils of DC generator are usually made of copper.
Description : A dummy strain gage is used in a quarter bridge strain gage circuit to : (A) compensate for changes in temperature and lead wire resistance (B) produce more output voltage from the bridge (C) increase the sensitivity of the bridge (D) compensate lead wire resistance only
Last Answer : A dummy strain gage is used in a quarter bridge strain gage circuit to : compensate for changes in temperature and lead wire resistance
Last Answer : In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.
Last Answer : The two pressure coils of a single phase power factor meter have the same dimensions and the same number of turns.
Last Answer : In a A.C. series motor armature coils are usually connected to commutator through resistance.
Last Answer : The critical resistance of the D.C. generator is the resistance of field.
Last Answer : Armature reaction in a generator results in demagnetisation of leading pole tip and magnetisation of trailing pole tip.
Description : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
Last Answer : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.
Last Answer : In a separately excited generator supplying rated load the armature reaction is always present.
Last Answer : A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.
Description : A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Last Answer : A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.
Last Answer : In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.
Last Answer : In over compounded generator, full load terminal voltage is more than no load terminal voltage.
Last Answer : In case of a flat compounded generator voltage remains constant irrespective of the load.
Last Answer : An exciter for a turbo generator is a shunt generator.
Last Answer : In a D.C. generator in case the resistance of the field winding is increased, then output voltage will decrease.
Last Answer : A D.C. generator can be considered as rotating amplifier.
Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.
Last Answer : In a D.C. generator, the critical resistance refers to the resistance of field.
Description : The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?
Last Answer : The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 580 V.
Last Answer : Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.
Last Answer : If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.
Description : In a shunt generator the voltage build up is generally restricted by?
Description : A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?
Last Answer : 200V/E2 = 1000/1200 E2= 240 V
Last Answer : In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.
Last Answer : The e.m.f. generated in a D.C. generator is directly proportional to speed of armature.
Last Answer : In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.
Last Answer : D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.
Last Answer : The armature core of a D.C. generator is usually made of silicon steel.
Last Answer : In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.
Last Answer : ni bondha
Last Answer : The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.
Last Answer : Welding generator will have lap winding.
Last Answer : If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.
Last Answer : A separately excited generator as compared to a self-excited generator is amenable to better voltage control, more stable, has exciting current independent of load current.
Description : For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?
Last Answer : Wave winding
Last Answer : In a D.C. generator, the iron losses mainly take place in armature rotor.
Last Answer : The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.