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CCF08182010_00012

# CCF08182010_00012 - lb FE/EIT Sample Examinations 1 ED 48 o...

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Unformatted text preview: lb FE/EIT Sample Examinations * 1 ED. 48 _ o —j68 44 20 A (j/sm jSS (*j/3H) (A) 0.80116.8° V (B) 121—53? V (C) 50136.8" V (D) cor—200° V 109. Two 10 Q resistances are connected in parallel. This combination is connected in series with a capacitor of 5 HF. The circuit is connected across a DC source voltage of 50 V. What is most nearly the maximum steady—state current through the battery? 100 5“,}: 10.0 (L +I 50V (A) 0 (B) 1A (C) 5A (D) 7A 110. The voltage appearing across the 4 Q resistor is msot nearly 8.0 + 120V; 40 (A) 27V (B) 40 V (C) 80 V (D) 120V 111. A series RLC circuit driven by an AC voltage contains reactances X L = 20 S] and X c = 14 Q and re- sistance R = 10 52. What is most nearly the impedance at resonant frequency? (A) 10 n (B) 14 c (C) 20 n (D) 24 c 112. What are the changes in internal energy for re- versible adiabatic and isothermal processes, respec— tively? (A) CpAT and O (B) 0 and C’VAT (C ) CVAT and OPAT (D) CVAT and 0 113. A steam engine operates between 150°C and 550°C. What is most nearly its theoretical maximum thermal efﬁciency? (A) 27% (B) 49% (C) 73% (D) 95% 114. Regardless of the process, the change in enthalpy (AH) for 71 moles of an ideal gas is nRT V :> VVV V O nCV AT ( ( ( ( TLCP AT B C D 115. Which of the following statements is true? (A) Entropy always decreases. (B) Entropy increases up to the critical tempera- ture7 and then it decreases. (C) Theoretically, entropy approaches zero as the temperature approaches zero. (D) None of the above statements are true. 116. When is the equation TdS = pdV + dU valid? (A) only in constant temperature processes (B) only in constant pressure processes (C) only in reversible processes (D) always 117. Which of the following statements is true for a perfect gas ﬂowing through an insulated valve? (A) Enthalpy is essentially unchanged. (B) Entropy decreases. (C) Temperature increases greatly. (D) Flow is isentropic. Professional Publications, Inc. — ...
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