Which one of the following is not a part of DC Machines: Commutator Yoke Damping winding Field winding Correct answer: 3. Damping winding Damper winding is not a part of DC Machines while all other are the parts of dc machines.
The form factor of sinusoidal alternating current is: 0.97 1.11 3.54 7.48 Correct answer: 2. 1.11 Explanation: Mathematical formula for the form factor Form factor = RMS value/Average value In case of Sine wave: RMS value of Sine wave= 0.707 * Vmax Average value of Sine wave= 0.637 * Vmax So Form factor of Sin … Read more
A 24-pulse converter unit consists of how many six-pulse bridges: One Two Three Four Correct answer: 4. Four Explanation A 24-pulse converter unit consists of four six-pulse bridges that are connected in series on the DC side with their respective transformers. Such a system produces four three-phase systems that are having 15 degrees of phase … Read more
HVDC MCQ#2: The ____________ and the __________ terminals of the SCR handle high potentials while the ___________ terminal is used for control purposes: Gate, Cathode, Anode Anode, Cathode, Gate Anode, Gate, Cathode Gate, Anode, Cathoe Correct answer: 2. Anode, Cathode, Gate In HVDC applications the anode and the cathode terminals of the SCR handle high … Read more
The most popular device used for HVDC system are: Thyristors MOS devices Correct answer: 1. Thyristors Explanation: The most popular devices used for HVDC are Thyristors the MOS devices are not practical because of the large rating of HVDC systems.
The correct formula for Voltage Regulation is: VR = (Vnl + Vfl)/ Vfl VR = (Vnl – Vfl)/ Vfl VR = (Vfl + Vnl)/ Vfl VR = (Vfl – Vnl)/ Vfl Correct answer: VR = (Vnl – Vfl)/ Vfl Voltage Regulation Formula Voltage regulation is the measure of the ability of an electrical machine to … Read more
The cleanest power plant is: Diesel power plant Hydro-electric plant Steam power plant Nuclear power plant Correct answer: 2. Hydro-electric plant The cleanest power plant is hydro-electric power plant
Alternators are rated in: kVA kW kVAR HP Correct answer: 1. kVA
Transformers are rated in: Volts Watts kVA HP Correct answer: 3. kVA
Electrical Motors are rated in: kVA kW kVAR HP Correct answer: 2. kW