Power Engineering 3A1 ch 7 questions with verified solutions

Power Engineering 3A1 ch 7 questions with verified solutions

1. The unit of relative density is: d
Select one:
A. kg/m³
B. lbs/ft³
C. N/m²
D. None
E. kg/cm³

2. rope block hangs from a beam. The rope is passing

a around two sheaves (sheave = wheel or disk with a
grooved rim, especially one used as a pulley) in each
block as illustrated below. Find the mass that can be
lifted with an effort of 40 N.

Select one:
A. 16.30 kg
B. 20.39 kg
C. 24.46 kg
D. 30.58 kg
E. 160 kg

3. The figure below shows a hydraulic jack system used c
for hoisting cars. Assuming the pressure of the air
is equal to the pressure on the piston, the piston
diameter of 27.5 cm, and the pressure value of 600 kPa
that compressor can generate, what is the maximum
load (in Newtons) the piston can raise?

Select one:
A. 35.64 N
B. 61.16 N
C. 35.64 kN
D. 41.58 kN
E. 142.55 kN

4. A pile of coal that forms a perfect cone shape has a

d base area of 24 m² and a height of 15 m. Assuming
1/
15

, Power Engineering 3A1 ch 7 questions with verified solutions

the pile has 25 percent of void space, and that the
density of the coal given is 1400 kg/m³, determine the
mass of




2/
15