Title CHEMICAL UNIT PROCESS EQUIPMENT 1 CH3301.pdf ✅

THIS PAPER CONSISTS OF 6 PRINTED PAGES (INCLUDING THE COVER PAGE)6 AND 1 BLANK PAGE. CH3301 CHEMICAL UNIT PROCESS EQUIPMENT 1 TIME ALLOWED: 2 HOURS END-OF-SEMESTER EXAMINATION (FORMAL) SEMESTER 2, 2022-23 SCHOOL OF PETROCHEMICAL INSTRUCTIONS TO CANDIDATES: ● DO NOT TURN OVER THE PAGE UNTIL YOU ARE TOLD TO DO SO. ● Write down the details required on the front cover of the answer booklet provided. Make sure you complete the details on any additional answer booklets that you use. ● Answer ALL questions. ● The total mark for this paper is 50. The number of marks for each question or part question is shown in brackets. ● This examination paper, your answer booklets and any other paper used in the examination must be handed in to the invigilators before leaving the room or hall. ● Write in dark blue or black ink pen. MATERIALS SUPPLIED: Answer booklet (1). MATERIALS PERMITTED: Calculator.
CH3301 (FORMAL) SEMESTER 2, 2022-23 © POLITEKNIK BRUNEI 2 SECTION A: Multiple-choice questions [Total marks: 15] Answer ALL questions. QUESTION 1 Erg is an energy unit in the cgs (centimeter-gram-second) unit system and is defined as 1erg = 1g∙cm2 . The relationship between erg and Joule (J) is . [1 mark] s 2 A. 1erg = 10−5J B. 1erg = 10−6J C. 1erg = 10−7J D. 1erg = 10−8J QUESTION 2 is a unit of (dynamic) viscosity. [1 mark] A. N∙m B. Pa∙s C. N/m2 D. Pa/s QUESTION 3 is NOT mechanical energy. [1 mark] A. Potential energy B. Kinetic energy C. Static pressure energy D. Internal energy QUESTION 4 is a Newtonian fluid. [1 mark] A. Water B. Molten chocolate C. Toothpaste D. Syrup QUESTION 5 For a steady-state flow, the rate of input the rate of output. [1 mark] A. <
CH3301 (FORMAL) SEMESTER 2, 2022-23 © POLITEKNIK BRUNEI 3 B. = C. > D. uncertain QUESTION 6 Corresponding to the heat flux q/A, the shear stress τyz learned from the Newton’s law of viscosity ryz = −μ dvy can be interpreted as a flux of . [1 mark] dz A. mass B. viscosity C. velocity D. momentum QUESTION 7 Hagen-Poiseuille equation used for calculating pressure drop is applicable to a . [1 mark] A. laminar flow B. turbulent flow C. transitional flow D. all of them QUESTION 8 For a turbulent flow in a circular tube, the Fanning friction factor depends on the Reynolds number and the . [1 mark] A. pressure of the flow B. relative roughness of the tube C. heat capacity of the flow D. thermal conductivities of the flow and the tube QUESTION 9 The three basic mechanisms of heat transfer DO NOT include . [1 mark] A. conduction B. convection C. radiation D. emission 3 [ Turn over
CH3301 (FORMAL) SEMESTER 2, 2022-23 © POLITEKNIK BRUNEI 4 QUESTION 10 agrees with the mechanism of convection. [1 mark] A. Roasting food on a fire B. Cooling with an air conditioner C. Ironing clothes D. Touching an ice cube QUESTION 11 The driving force of heat transfer is the difference in . [1 mark] A. density B. concentration C. temperature D. pressure QUESTION 12 The emissivity of a real material is . [1 mark] A. > 1 B. < 1 C. = 1 D. uncertain QUESTION 13 The dimensionless group correlates the thermal conductivity and the convective coefficient. [1 mark] A. Reynolds Number (NRe) B. Nusselt Number (NNu) C. Prandtl Number (NPr) D. Grashof Number (NGr) QUESTION 14 If the fouling coefficient of A is greater than that of B, i.e., hdA>hdB, their heat resistances RA RB. [1 mark] A. > B. < C. =