Q10 What Is The Average Value Of The Motor Full Voltage Starting Current A 534 68a B 568 56 A C 602 45a D 984 1 (30.23 KiB) Viewed 30 times
Q10 What Is The Average Value Of The Motor Full Voltage Starting Current A 534 68a B 568 56 A C 602 45a D 984 2 (19.85 KiB) Viewed 30 times
Q10. What is the average value of the motor full-voltage starting current? (a) 534.68A (b) 568.56 A (c) 602.45A. (d) 984.72 A (e) 1705.64A Q11. The stator winding of a squirrel cage induction motor at no-load and 30°C is measured to be 4.212. After an extended period of continuous operation at full load the stator resistance increases to 5.92 What is the average temperature of the stator winding if the relation between resistance and temperature is T₁=(234+1)-234? (a) 166,86 "C (b) 146.86 "C (c) 136.86 "C (d) 126.86 C 106.86 "C Q12. The class H stator winding of a squirrel cage induction motor at no-load and 18°C is measured to be 650 m2. After an extended period of continuous operation at full load the stator resistance increases to 952 m2. What is the hot-spot temperature of the stator winding if the relation between resistance and temperature is T-(234-7)-2347 R (a) 150 °C (b) 145 °C (c) 140°C (d) 135 °C (c) 130°C Q13. Which of the following is the main disadvantage of using constant V ratio in VFDs? (a) Poor performance at high frequencies (b) Poor performance at low frequencies (c) Poor performance at mid-range (d) Poor performance at all frequencies (e) None of the above Q14. Which of the following methods provide the best performance over the entire VFD frequency range? (a) Constant V (b) Flux vector control (c) Flux vector control with speed sensor (d) Constant voltage (e) Pulse width modulation Q15. Harmonics are generated by (a) The main utility generators (b) Small standby generators (c) Resistive, capacitive and inductive loads (d) Electronic loads (e) All of the above
Q16. Name a method to eliminate the harmonics from an electric circuit (a) Increasing the size of grounding conductors (b) Increasing the system voltage (c) Using special tuned filters (d) Adding capacitors in parallel to a load (e) All of the above Q17. A distorted, periodic waveform can be decomposed into fundamental sine wave and a series of harmonic waves. This statement is based on which theorem (a) Laplace (b) Fourier (c) Thevenin (d) Superposition (e) Maximum power
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