Module 1 Electrical Fundamentals Practice Exam with correct answers 100%

Module 1 Electrical Fundamentals Practice Exam with correct answers 100% A circuit has three 5(OHMS) resistors connected in parallel. The resistance of this circuit is_________. - Correct Answer A) 1.66 (OHMS) (Theory 15.3(A) ) RT=Resistance of One Resistor/Number of Resistors RT=5OHMS/ 3 Resistors RT=1.66 OHMS *Note: the total resistance is always smaller than the smallest resistors. What is the current through a 9.50 kW heat strip rated 240V? - Correct Answer C) 39.60A ( Theory 13.3) Step 1: What is the question? What is "I"? Step 2:What do you know? Heat Strip Power Rating, P=9.50 pW*1,000 Heat Strip Power Rating, P=9,500W Heat Strip Voltage Rating, E = 240V Step 3: I=P/E. I=9,500W/240V I=39.60A What is the approximate power consumed by a 11.5 kW heat strip rated 240V, connected to 208V? - Correct Answer A)8.7 kW ( Theory 13.4) If the heater is rated at 11.5 kW at 240V and its connected to 230V then the power will be less than 11.5 kW. Step 1: Determine the resistance of the load. R=E^2 /P R= 240V2/11,500W R=57,600/11,500W R=5(OHMS) Step 2: Determine the power of the load at 230V R=E^2 /P E=208V, Volts given R= 5(OHMS),resistance given P= (208V* 208V)/5(OHMS) P=43,264/5(OHMS) P=8,653W, round to 8.7kW to match the answer options What is the nameplate current rating of a 1.5hp, 120V motor at 90 percent efficiency at 85 percent power factor ? - Correct Answer D) 12A ( Theory 21.5) Motor FLA =(hp* 746W)/(E*Eff*PF) Motor FLA=( 1.5 hp*746W)/(120V*90% Eff*85% PF) Motor FLA =(746W*1.5)/(120V*90% Eff*85% PF) Motor FLA= 1,119W/(120V*90% Eff*85%PF) Motor FLA= 1,119W/91.8 Motor FLA=1,119W/91.8 Motor FLA=12.12A, rounded to 12A to match answer options The approximate output current for a three-phase , 48kVA, 120/208V generator is _______. - Correct Answer D)133A (Theory 22.4) I=VA/(E*1.732) VA=48,000 VA E=208V I=48,000 VA/ (208V*1.732) I=48,000 VA/360 I=133.33A, round to 133A to match answer options What is the total resistance of three resistors where R1 is 15(OHMS), R2 is 20 (OHMS) and R3 is 35(OHMS)? - Correct Answer B) 70(OHMS) (Theory 14.3 (A) ) RT=R1+R2+R3 RT=15(OHMS)+20(OHMS)+35(OHMS) RT=70(OHMS)