Mekanika dan Hidrodinamika Ujian Akhir Diklat ATT-II - BLOG PELAUT

# Mekanika dan Hidrodinamika Ujian Akhir Diklat ATT-II

## Mekanika dan Hidrodinamika

1. Mechanics are usually divided into three parts including the following except :
a. Mechanics of rigid bodies,
b. Mechanics of deformable,
c. Mechanics of fluids.
d. Mechanics of engine ✔️
e. None of the above

2. Two forces reacted to a particle, can be replaced by one style (style resultant) obtained by describing diagonal parallelogram with second side the style.
a. Parallelogram Low ✔️
b. Newton Lows 1
c. Newton Lows II
d. Newton Lows III
e. None of the above

3. If resultant forces acting on a particles equal to zero there is no force, so particles silent will keep silence and or particles move will moving with a constant velocity.
a. Low of inertia
b. Newton Lows I ✔️
c. Newton Lows II
d. Newton Lows III
e. None of the above

4. If resultant forces acting on a particles not equal to zero such particles will be comparable to the acceleration. And the resultant in the same direction as the direction of the force the resultant.
a. Low of inertia
b. Newton Lows I
c. Newton Lows II ✔️
d. Newton Lows III
e. None of the above

5. If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be
a. 2 meters of water column
b. 3 meters of water column
c. 5 meters of water column
d. 6 meters of water Column ✔️
e. None of the above

6. A simply supported beam carries uniformly distributed load of 20 kN/m over the length of 5 m. If flexural rigidity is 30000 kN.m2, what is the maximum deflection in the beam?
a. 5.4mm ✔️
b. 1.08mm
c. 6.2mm
d. 8.6 mm
e. None of the above

7. The design of a beam is based on strength criteria, if the beam is sufficiently strong to resist.
a. shear force ✔️
b. deflection
c. both a. and b.
d. none of the above
e. all of the above

8. The vertical distance between the axis of the beam before and after loading at a point is called as.
a. deformation
b. deflection ✔️
c. slope
d. none of the above
e. all of the above

9. Load is gradually applied on a steel plate shown below, what is the modulus of resilience, if 130 N/mm2 is the maximum stress applied? (Assume E = 100 x 10³ Mpa)
a. 0.845 N/mm² ✔️
b. 0.0845 N/mm²
c. 0.00845 N/mm²
d. Insufficient data
e. All of the above

10. What is the strain energy stored in a cube of 50 mm, when it is subjected to shear stress of 200 Mpa. (G = 100 Gpa)
a. 25 Nm ✔️
b. 75 Nm
c. 125 Nm
d. 150 Nm
e. 150 N/m

11. The propeller shaft of a ship must transmit a 5 MW when rotating at 120 rounds/minute. The shear stress maximum allowed is 60 MN/m2, and torque will fluctuate. the average torque fluctuate is:
a. 397,8 x 10³Nm ✔️
b. 397,8 x 10² Ncm
c. 397,8 kNmm
d. 397,8 Nmm
e. 397,8 N/m

12. How the section a drum smallest so that one side of the ten cubit 2 mm steel tape can is wrapped without bending the permanently, if steel have the elastic limit 320 Mn/m2 and modulus its elasticity is 200 GN/m2
a. 1,25 m ✔️
b. 1,25 cm
c. 1,25 mm
d. 1,25 m²
e. 1,25

13. Equal to about no.6 if maximum torque is 1,3 x torque the average, specify id section that is required when used a shaft, except.
a. 0.353 m
b. 353 mm
c. 35,3 cm
d. 35,3 m² ✔️
e. All of the above

14. A shaft propeller a ship was to have cirlular cross section. A shaft have to transmits 8 MW if rotates about 90 round/mimute, and it is estimated that maximum torque at 1,25 x average torque. Specify the section of a shaft minimum, if shear stress not exceed 55 MN/m2.
a. 461mm
b. 46,1 cm
c. 0,461 m
d. All of the above ✔️
e. None of the above

15. Which of the following conditions should be satisfied for co-planer concurrent forces to be in equilibrium?
a. Σ Fx = Σ Fy = 0 ✔️
b. Σ M = 0
c. Both a. and b.
d. None of the above
e. All of the above

16. Which motion has magnitude of static frictional force directly proportional to normal reaction?
a. Actual motion
b. Impending motion ✔️
c. Both a. and b.
d. None of the above
e. All of the above

17. Which formula is used to calculate angle of static friction (Φs)?
a. tan-¹ μs ✔️
b. sin-¹ μs
c. cos-¹ μs
d. none of the above
e. All of the above

18. Frictional force depends on ____
a. surface area in contact
b. roughness of surface ✔️
c. both a. and b.
d. none of the above
e. all of the above

19. A cylinder made of plain carbon steel has inner diameter 100 mm. What is the thickness of cylinder if maximum internal pressure of 20 Mpa acts on it? ( σall = 100 N/mm2 & poisson's ratio = 0.3)
a. 11 mm ✔️
b. 15.36 mm
c. 22.32 mm
d. 80 mm
e. 10 mm

20. Internal pressure of 2.5 Mpa acts on a pressure vessel of thickness 15 mm and internal diameter of 1500 mm. What is the stress induced in longitudinal direction?
a. 36.63 N/mm²
b. 59.13 N/mm²
c. 65.62 N/mm² ✔️
d. 131.25 N/mm²
e. none of the above

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