ECE-447 Exam # 1

ECE-447 Exam # 1 - ECE 447 --- Exam #l -—- WI 2009 1-...

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Unformatted text preview: ECE 447 --- Exam #l -—- WI 2009 1- Draw the transformer equivalent circuit. {15 points} {Four major components with their proportion together) 2- Mention different tests used to measure transformer components? {Specify the measured components in each test) and show the approximated circuit in each test. (I 0 points) _ H 'I. I t I r r' 't 3- Calculate the components in the primary. (15 points} i L I. ECE 447 --- Exam #1 --- WI 2009 4-F or the DC Generator Experiment, we used a synchronous motor as a prime mover to drive our DC generator. (10 points} i) How did we increase the terminal voltage of the DC generator? ii) Draw the output power in dc generator vs field current included rotational power loss S-The general shape of the terminal volta e vs. load current characteristic is shown for each of the following DC generator configurations. Identify each curve using the following descriptions. {10 points) i) ideal generator ii) separately excited (shunt field only) iii) cumulative compound iv) differential compound Vt ECE 44? --- Exam #! --- WI 2009 fi-draw the phasor diagram of synchronous motor for leading armature current. (it! points} 4:_-._ it Ne _, or: T—In the sketch shown here, the armature current of synchronous motor is plotted vs. field current i) On the sketch, label each of the following regions. (20 points) * leading current power factor (angle of voltage less than armature current) * unity power factor * lagging current power factor (angle of voltage more than armature current) ii) The real power corresponding to each V-curve is labeled in the figure. What do you think is correct? wlfi}fl>fi M// wia=e=e e)3<fisfl ECE 44'? --- Exam #1 "v WI 2009 8- What docs happcn if we do not use starter? (Explain with tho dynamic equation of synchronous motor) (in points} i "‘ ‘ ' . "a ‘ l I. .h ' L' ' -' l I Ill-1' : I . . _ . . . 'I_I_fi_{.~ffi}. _ R'V-WWk-\ \ ¥* Q‘\H- inf-Ii I - .J i u. ' .l _1| " i a 1'1» . "in; I k I '5- II' 1 f I! J"! k L | WP L ih 'I .L-H-ILIII, [ k .I,.. I. L ._ N H. ‘-. 15" "h— i 1 II E. I 11* 'L . l I (Bonus Question) _ _I k L. 1‘. I” _ I I. I , . L... 9- Calculate Voltage Regulation for the following circuit (10 points) aflflsint ...
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ECE-447 Exam # 1 - ECE 447 --- Exam #l -—- WI 2009 1-...

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