Random Problems Flashcards
A 6 volt lead-acid battery has an internal
resistance of 0.01 ohm. How much current
will flow if the battery has a short circuit?
60 A
A meter whose needle is initially at the
center.
Galvanometer
Resistivity of copper and aluminum
Copper- 1.72x10-⁸
Aluminum - 2.8×10-⁸
Determine the amount of moisture removed when 100 kg of grains at 20% MCwb is dried to 13% MCwb.
8.04 kg
Determine the amount of moisture removed when 100 kg of grains at 20% MCdb is dried to 13% MCdb
5.84 kg
What is the speed (rpm) of 63.42 mm (diameter) shaft transmitting 75 KW if stress is not to exceed 26 MPa?
550 rpm
Two cells each of emf of 1.5 V and internal resistance of 0.2 ohm
are joined in parallel and connected to an external resistance of 0.8
ohm. What current will flow through the external resistance?
3
A reinforced concrete column, 5m high has a cross section of 400
mm x 400 mm. It is reinforced by four steel bars each 20 mm in
diameter and carries a load of 1000 kN. What is the deformation of
the column? Modulus of elasticity for steel is 200 GPa and for
concrete is 15 GPa.
1.9 mm
Determine the resultant of the three forces originating from the
origin (0,0) and passing through the points indicated: 200 N
through (4,5), 200 N through (1,-4) and 300 N through (-3, 1).
124.9 N
A battery can supply 10 joules of energy to move 5 coulombs of
charge. What is the voltage of the battery?
2 voltage
The resistivity of a wire is 1.69 × 10-8 ohm-m. If it has a diameter of
0.1 cm, what is its length if the total resistance is 10 ohms?
465 m
A mechanical dryer is designed to handle 2 metric tons per hour of
coconut net containing 60 percent water and to produce copra
containing 5 percent water. Calculate the amount of water removed
in kg water based on the final product.
1.375
A 40-kg block is resting on an inclined plane making an angle of 20
deg with the horizontal. If the coefficient of friction is 0.6, determine
the force parallel to the incline plane that must be applied to cause
an impending motion down the plane?
87
An automobile goes around a slippery curve of radius 52 m. If the
road is banked at an angle of 18° with the horizontal, at what
maximum speed in kph may the automobile travel to avoid
46.346 kph
A steel wire is 4.0 m long and 2 mm in diameter. How much is it
elongated by a suspended body of mass 20 kg? Young’s modulus
for steel is 196,000 MPa.
1.274 mm
