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【简答题】
A 60-Hz 20-kVA 8000/240-Vrms transformer has the following equivalent-circuit parameters: Primary resistance R 1 = 15Ω Secondary resistance R 2 = 0.02Ω Primary leakage reactance X 1 = 120Ω Secondary leakage reactance X 2= 0.15 Ω The magnetizing reactance ( X m ) and core-loss resistance ( R C ) are negligible and can be ignored. The transformer is supplying rated load ( i.e. 20-kVA) with a lagging power factor of 0.8. The output voltage phasor is V o=240 ∠0°. Find (1) Active output power, Pout = _____ W (2) Primary current |I 1 | =______A (3) The angle of primary current is ______ ° (4) Input voltage |V in | =______V (5) The angle of input voltage is ______ ° (6)Percentage voltage regulation VR =______ (decimal representation) (7) Input active power, P in = _____ W (8) Efficiency of the transformer = _____ (decimal representation).
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皮皮学刷刷变学霸
举一反三
【判断题】Women's traditional roles have been swept away, and how they now exercise their birthright of greater choice.
A.
正确
B.
错误
【单选题】在相同条件下，双调谐回路放大器与单调谐回路放大器相比，下列表达正确的是()
A.
双调谐回路放大器的选择性优于单调谐回路放大器，通频带也较宽
B.
双调谐回路放大器的选择性优于单调谐回路放大器，通频带也较窄
C.
单调谐回路放大器的选择性优于双调谐回路放大器，通频带也较宽
D.
单调谐回路放大器的选择性优于双调谐回路放大器，通频带也较窄
【单选题】能够指示化学反应终点到达的指示剂必须具有下列何种性质
A.
明显的颜色变化
B.
不与反应产物发生化学反应
C.
不与反应物发生化学反应
D.
在反应终点前后有明显的颜色变化
【单选题】A: _____ du ein Auto? B: Nein, mein Bruder _____ ein Auto.
A.
habst, hat
B.
habst, habt
C.
hast, hat
D.
hast, habt
【简答题】You should wait here before you sit down.
【简答题】可见异物检查中规定,供试品至人眼的距离,通常为( ) 。
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