IBX5980432E7F390 CBA - Thermodinamika - BLOG PELAUT

CBA - Thermodinamika


Computer based assessment (CBA)

1). An engine has a normal speed of 960 rpm, and no load speed of 1000 Rpm. The speed droop of governor will be about :
a). 1%
b). 2 %
c). 3"%
d). 4 % ✔️
Cara =

2). The calorific value of gas
a. Kcal/m²
b. Kcal/kg ✔️
c. Kcal/n
d. Kcal. n

3). If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the % age increase in efficiency will be
a). 10%
b). 12%
c). 14%
d). 28% ✔️

4). a liquid compressed in cylinder has a volume of 0,04 m³ at 50 kg/cm² and a volume of 0,039 m³ at 150 kg/cm². The bulk modulus of elastic of liquid is..
a). 1000 kg/cm²
b) 2000 kg/cm²
c). 4000 kg/cm² ✔️
d). 6000 kg/cm²

5) dimension of surface tension are
a). MT - ² ✔️
b) MT ²
c). Mt
d). Mt²

6). the valve of the wave length for maximum emissive power is given by :
a). Wien's law ✔️
b). Planck law
c). Stefan's Law
d). Fourier Law
e). Kirchoff Law

7). Two plated spaced 150 mm a part are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
a). Convection
b). Free Convention ✔️
c). Forced convection
d). Radiation
e). Radiation and convection

8). Log mean temperature difference in case of counter flow compared to parallel flow will be :
a). Same
b). More ✔️
c). Less
d). Depend on the factors
e). None of the above

9). The valve of prandtl number for air is about
a). 0,1
b). 0,3
c). 0,7 ✔️
d). 1,7
e). 10,5

10). The unit of overall coefficient of heat transfer is
a). Kcal/m²
b). Kcal/hr. °C
c). Kcal/m².hr.°C ✔️
d). Kcal/m.hr.°C
e). Kcal/m³.hr.°C
Catatan :
h = koef. Perpindahan panas w/m².°C (convection)
k = kcal/m.hr.°C (conduction)

11). The concept of overall coefficient of heat transfer is used in case of heat transfer by
a). Conduction
b). Convection
c). Radiation
d). Convection and Conduction ✔️
e). None

12). Thermal conductivity of wood depends on
a). Moisture ✔️
b). Density
c). Temperature
d). All of the above
e). None of the above

13). Unit of thermal diffusivity is
a). m³/sec
b). m²/sec ✔️
c). m/sec
d). All of above
e). None of above

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