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AREA 3 > Random Problems > Flashcards

Random Problems Flashcards

1
Q

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?

A

60 A

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2
Q

A meter whose needle is initially at the
center.

A

Galvanometer

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3
Q

Resistivity of copper and aluminum

A

Copper- 1.72x10-⁸

Aluminum - 2.8×10-⁸

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4
Q

Determine the amount of moisture removed when 100 kg of grains at 20% MCwb is dried to 13% MCwb.

A

8.04 kg

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5
Q

Determine the amount of moisture removed when 100 kg of grains at 20% MCdb is dried to 13% MCdb

A

5.84 kg

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6
Q

What is the speed (rpm) of 63.42 mm (diameter) shaft transmitting 75 KW if stress is not to exceed 26 MPa?

A

550 rpm

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7
Q

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?

A

3

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8
Q

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.

A

1.9 mm

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9
Q

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).

A

124.9 N

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10
Q

A battery can supply 10 joules of energy to move 5 coulombs of
charge. What is the voltage of the battery?

A

2 voltage

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11
Q

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?

A

465 m

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12
Q

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.

A

1.375

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13
Q

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?

A

87

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14
Q

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

A

46.346 kph

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15
Q

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.

A

1.274 mm

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16
Q

Find the molecular weight of octane (gasoline) C8H18.

A

114

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17
Q

A simply supported beam, 10 m long carries a uniformly distributed
load of 20 kN/m. What is the value of the maximum shear of the
beam due to this load?

A

100 KN

18
Q

How many 4.7mm plywood are needed to cover a wall partition 6 m long x 2.4 m high. If the 2x2 nailers will be spaced @ 0.4 x 0.6m on centers, how many board foot of 2x2 nailers will be used.

A

5 sheets

75 bf

19
Q

A simply supported horizontal beam, with a span of 4 m, is carrying loads of 5 kN and 10 kN at 1 m and 3 m from the left support, respectively. 9. What is the maximum bending moment experienced by the beam?

A

8.75 KN-m

20
Q

Minimum cross section of the beam to resist bending stress (allowable bending stress is 16.5 MPa).

A

6×6 inches

21
Q

The maximum deflection of a 5” x 10” wood beam with a span of 5 m and supports a total load of 18 kN/m (Modulus of Elasticity = 4 GPa)

A

0.693 ft

22
Q

What force is required to punch a 20 mm diameter hole in a plate that is 25 mm thick? The shear strength is 350 MPa.

A

550 KN

23
Q

A simply supported beam having a span of 6 m carries two concentrated loads of 80 kN at its middle thirds. Compute the deflection at midspan due to this load. Assume Flexural rigidity = 30 670 x 10^9 N-mm^2.

A

20 mm

24
Q

A truck with axle loads of 40 kN and 60 kN on a wheel base of 5 m rolls across a 10-m span. Compute for the value of x.

A

2 m

25
Q

A steel shaft 3 ft long that has a diameter of 4 in is subjected to a torque of 15 kip-ft. Determine the maximum shearing stress and the angle of twist. Use G = 12 × 10^6 psi.

A

14.3 ksi
1.23°

26
Q

Calculate the heat transfer per hour
through a solid brick wall 6m long, 2.9 m
high, and 225 mm thick, when the outer
surface is at 5°C and the inner surface
17°C, the coefficient of thermal
conductivity of the brick being 0.6 W/m-K.

A

2 MJ

27
Q

Thehotgastemperatureina heat
exchangeris350°C(ho=220W/m²-
K).Whatisthesurfacetemperature
onthewalliftheheattransferredis
1500W/m²?

A

343.18°C

28
Q

Water is flowing in a pipe with a radius
of 25.4 cm at a velocity of 5 m/s at the
temperature in the pipe. The density
and viscosity of the water are as
follows: density=997.9 kg/m³ and
viscosity = 1.131 Pa-s. What is the
Reynolds number for this situation?

A

2241

29
Q

A thin square steel plate, 10 cm on a
side, is heated in a blacksmiths forge
to a temperature of 800 °C. If the
emissivity is 0.60, what is the total rate
of radiation of energy?

A

45 W or 450

30
Q

An electric pump has total resistance of 9.5 ohms. If its power source is from a 220-volt
outlet, what should be the amperage of its safety fuse? Assume 27 % surge current.

A

30 amp

31
Q

What is the peak solar power generation per charging channel of a solar battery
charging station equipped with 12 units of 75 watt-peak 12-volt solar module? The system
is divided into 3 charging channels, each channel has 4 modules connected in parallel.
Assume 80% overall efficiency.

A

240

32
Q

An industrial heater has 8 pieces heating plates of 6 ohms each. Plates are arranged in
series. If the heater power source is from a 220-volt outlet, how much current will flow?

A

4.6 A

33
Q

The most hydraulically efficient trapezoidal channel section to carry a discharge of 5m3
/s on a bed material with
roughness n of 0.02 and a bottom slope of 1 in 800. What should be the bottom width of the canal?

A

1.65 m

34
Q

What is the equivalent size in square millimeter of a 250 MCM cable?

A

126.67 mm2

35
Q

80.What is the rate of rice husk consumption of a 2-ton grain dryer requires to dry paddy from 22 to 14% in 8 hrs. The dryer
overall thermal efficiency is 45%. Assume a heat of vaporization for paddy of 600 kcal/kg of moisture evaporated and
heating value for rice husk of 3000 kcal/kg.

A

10.34kg/hr

36
Q

How many kilograms of rice hulls are needed to dry 1 ton of palay from 24% to 14% w.b.? Assume latent heat of
vaporization is 2,500 kJ/kg, heating value of rice hull is 14 MJ/kg and efficiency of 100%.

A

20.8 kg

37
Q

How many 75 watt-peak solar modules are needed for a solar powered incubator having a power rating of 144 watts, system voltage of 48 volts and amperage of 6 amperes? All solar modules used have 12 volts nominal voltage and 4.6 amperes peak amperage.

A

8 modules

38
Q

When approved as Clean Development Mechanism (CDM) project, how much will the project owner of a new
covered lagoon biodigester receive annually from CDM fund for the first 10 years if the digester produces
7,000 tons of methane plus 3,000 tons of carbon dioxide annually. Assume current carbon credit costs
US$12 per ton of carbon equivalent.

A

US$1,800,000

39
Q

Based on PAES 403:2001, determine the minimum floor space requirement for a 250-head layer poultry house
with slotted flooring. The layers are at least 22 weeks old

A

23 m²

40
Q

Based on PAES 401:2001, compute the number of nursery pens for a 26-sow swine farm. Set a litter index of
0.89, litter size of 9, number of pigs per pen is 3, and occupancy period of 38 days.

A

8

41
Q

A counter-flow heat exchanger is designed to heat a fuel oil from 45°C to 100°C while the heating fluid enters at
150°C and leaves at 115°C. Calculate the arithmetic mean temperature difference.

A

60°C

42
Q

How much glucose syrup with 20% concentration has to be mixed with 100 kg glucose syrup with 40%
concentration so that the mixture will have 36% glucose?

A

25 kg

AREA 3 (5 decks)

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