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Electrical Engineering MCQs: 3,658 practice questions with answer choices and available explanations. Page 176 of 244.

Electrical Engineering MCQs by topic

Basic Electrical MCQs121Power Electronics217Transformers132Transmission and Distribution90D.C. Motors130D.C. Generators120Polyphase Induction Motors99Single Phase Induction Motors110Synchronous Motors122Network Theorems47Economics of Power Generation98A.C. Fundamentals, Circuits and Circuit Theory109Cables57Electrolysis and Storage of Batteries119Electrostatics180Magnetic Circuit28Rectifiers and Converters58Magnetism and Electromagnetism85Electromagnetic Induction85Switchgear and Protection102OP-AMP Circuits24Heating and Welding50Earthing or Grounding11Parallel Circuits25Oscillators28Amplifiers with Negative Feedback18Transistors42Semiconductor Diode44Analog Electronics46Hybrid Parameters12Modulation and Demodulation40Control Systems100Digital Electronics36Electric Traction74Electrical Engineering Materials100Electrical Machine Design103Electronic Instruments30Field Effect Transistors - FET47Industrial Drives70Integrated Circuits15Measurement and Instrumentation109Multi-Stage Transistor Amplifiers40Power Generation121Regulated D.C. Power Supply39SCR (Silicon Controlled Rectifiers)25Semiconductor Theory35Single Stage Transistor Amplifiers38Solid-State Switching Circuits29Transistor Audio Power Amplifiers39Transistor Biasing40Transistor Tuned Amplifiers40Series-Parallel Circuits29Passive Filters20Operational Amplifier30
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Electrical Engineering MCQs

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Regenerative method of braking is based on that________?

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A.back e.m.f. is equal to the applied voltage
B.back e.m.f. is less than the applied voltage
C.none of the above
D.back e.m.f. of rotor is more than the applied voltage
Explanation: Sure, let’s break it down. In a regenerative braking system, when the motor is acting as a generator, it generates an electromotive force (emf) due to the motion of the rotor. This emf is commonly referred to as the “back emf” because it opposes the applied voltage that’s trying to keep the motor running. Now, during regenerative braking, the motor’s rotor is still spinning, but the applied voltage is reduced or even reversed to slow down or stop the motor. Since the rotor is still in motion, it generates a back emf. For regenerative braking to be effective, this back emf needs to be greater than the applied voltage. This ensures that energy is being returned to the power source rather than being dissipated as heat in traditional braking systems. So, option C states that the back emf of the rotor is more than the applied voltage, which aligns with the principle of regenerative braking.

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“Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances”. This statement is associated with:

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A.Maximum power transfer theorem
B.None of the above
C.Millman’s theorem
D.Thevenin’s theorem
Explanation: The correct answer is Millman’s theorem.

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