HomeElectricianElectrician DC machine mini quiz Electrician DC machine mini quiz Education March 17, 2023 0 1➤ Which rule is used to find the direction of induced emf in D.C generator?Fleming’s left-hand rule Cork screw ruleRight hand palm ruleFleming's right-hand rule2➤ What is the formula to calculate back emf of a D.C motor? All of these Eb = V – Ia Ra VoltsEb = V + Ia Ra VoltsEb = V x Ia Ra Volt3➤ How interpoles are connected in a DC generator? In series with armature In series with shunt fieldIn parallel with armatureIn parallel with shunt field4➤ Why the armature core of a DC generator is laminated? Reduce the copper lossReduce the hysteresis loss Reduce the eddy current lossReduce the friction loss5➤ Why the D.C generator should run in clockwise direction only? Avoid short circuit in armature Avoid over loading of generatorProtect brushes from damageProtect the residual magnetism6➤ What is the function of split rings in DC generator? Maintain constant voltage Collects the current unidirectionallyBoth A and BEither A or B7➤ Why DC generators are loosing their residual magnetism?Change of direction of rotation very oftenContinuous running without break Heavy short circuit in load Running without load continuously8➤ Which instrument is used to measure armature winding resistance?Series type Ohm meter Kelvin bridgeMultimeterMegger9➤ Which instrument is used to test armature winding for short and open circuit? Internal Growler Tong TesterDigital multimeterExternal Growler10➤ What is the purpose of series resistor connected with holding coil in a D.C four point starter? Increase the voltage in holding coilDecrease the voltage in holding coilLimit the current in holding coilIncrease the current in holding coil SubmitYour score is Tags Electrician Newer Older