Generally, the rotor winding of 3 phase wound rotor induction motor is connected in which configuration: Delta Star Any of above None of above Correct answer: 2. Star Explanation: Generally the rotor winding of 3 phase wound rotor induction motor is connected in star configuration. This enables to connect additional external resistance in to the … Read more
For power factor improvement in case of 3-phase loads, the capacitors are connected in which configuration: Star Delta Any of above None of above Correct answer: 2. Delta Explanation: Capacitors are connected in delta configuration. The reason being that capacitance of capacitor required is one-third of that required for the star configuration.
Electrical measurement and instrumentation refers to the use of instruments (such as voltmeters, ammeters, oscilloscope) for measuring electrical units and quantities such as voltage, current, and, resistance. A voltmeter connects in A voltmeter connects in: Series Parallel Both of these Any of above Correct answer: 2. Parallel The ammeter connects in The ammeter connects in: … Read more
Multiple choice questions on Synchronous motor with brief explanatory answers. Synchronous Motor MCQ Part 7 The pull-out torque of a 3 phase synchronous motor varies as The pull-out torque of a synchronous motor varies as: 1/V Voltage Square of voltage Square root of voltage Correct answer: 2. Voltage Explanation: The pull-out torque of a synchronous … Read more
Balanced earth fault protection is generally provided in: Small size alternators Medium size alternators Large size alternators None of the above Correct answer: 1. Small size alternators Explanation: Balanced earth fault is generally provided for the small size alternators. The reason is that in small-sized alternators, the natural ends of three-phase windings are internally connected … Read more
Eddy Current Loss in a transformer is directly proportional to which of the following factors: The supply frequency The flux density in the core The thickness of core lamination Square of the thickness of core lamination Correct answer: 4. Square of thickness of core lamination Explanation: A time-changing flux induces voltage within a ferromagnetic core. … Read more
Power electronics refers to the study of electronic switching for controlling the flow of electric power. A cycloconverter converts A cycloconverter converts: AC to DC DC to AC DC to DC with different level AC to AC at different frequencies Correct answer: 4. AC to AC at different frequencies The power diode is a The … Read more
Transformer MCQ Questions Part 4. Electrical Engineering MCQ Questions on Transformer with brief explanatory answer and complete solution. Numerical No 1 A 230/1100 V transformer takes no load current of 5 A and absorbs 150 W. Calcualte the core loss if the resistance of primary is 0.05 ohms: 125.5 W 148.75 W 322.98 W 485.75 … Read more
Electrical Engineering multiple choice questions on Transistor Biasing. Transistor biasing represents the use of which condition Transistor biasing represents the use of: AC conditions DC conditions Both of above None of above Correct answer: 2. DC conditions The terms biasing a transistor means the use of DC voltage for establishing the certain operating conditions in … Read more
Induction motor MCQ Part 5. Multiple choice questions on Induction motor with brief explanatory answers. If air gap between rotor and stator of a 3 phase induction motor is increased then If air gap between rotor and stator of a 3 phase induction motor is increased then: Leakage reactance is decreased Leakage reactance is increased … Read more