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สาขา: ไฟฟาแขนงไฟฟากําลัง วิชา: EE04 Power Plant and Substation ขอที: 1 โรงงานมีการใชไฟฟาทั้งหมดในหนึ่งวันเทากับ 4,200 กิโลวัตตตอชั่วโมง โดยทํางานวันละ 15 ชั่วโมง และมีการใชไฟฟาสูงสุด 300 kW ใหหาแฟกเตอรของโหลด (Load factor) คําตอบ 1 : 0.56 คําตอบ 2 : 0.58 คําตอบ 3 : 0.93 คําตอบ 4 : 0.47 ขอที: 2 โหลดสองชุดมีการใชไฟฟาสูงสุดรวม 300 kW ดังนีโหลดชุด1 มีการใชไฟฟาสูงสุด 200 kW ใชพลังงานไฟฟา 3,120 kWh/วัน โหลดชุด 2 มีการใชไฟฟาสูงสุด 150 kW ใช พลังงานไฟฟา 2,400 kWh/วัน ใหหาโหลดแฟกเตอรของโหลดรวม คําตอบ 1 : 0.77 คําตอบ 2 : 0.86 คําตอบ 3 : 0.66 คําตอบ 4 : 0.58 ขอที: 3 โหลดแฟกเตอร (Load factor) คือ คําตอบ 1 : กําลังไฟฟาเฉลี่ย / กําลังไฟฟาสูงสุด คําตอบ 2 : กําลังไฟฟาสูงสุด / กําลังไฟฟาทั้งหมดที่ตออยู คําตอบ 3 : กําลังไฟฟาเฉลี่ย / กําลังไฟฟาทั้งหมดที่ตออยู คําตอบ 4 : กําลังไฟฟาต่ําสุด / กําลังไฟฟาเฉลี่ย ขอที: 4 มีการใชกําลังไฟฟาในหนึ่งวันเปนดังนี12 MW ใชนาน 4 ชม., 10 MW ใชนาน 4 ชม., 8 MW ใชนาน 6 ชม., 15 MW ใชนาน 8 ชม., 6 MW ใชนาน 2 ชม. ใหหาโหลดแฟกเตอร ของการใชกําลังไฟฟาขางตน คําตอบ 1 : 0.4 คําตอบ 2 : 0.74 คําตอบ 3 : 0.54 คําตอบ 4 : 0.5 ขอที: 5

Power Plant and Substation

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