Random Problems Flashcards
Dr. Walter Valdez desires to make an investment in bonds, provided she can realize 10% annually on her
investment. How much can he afford to pay for a Php 50,000 bond that pays 5% annual interest and will mature
10 years hence?
Php 34,638.58
An agricultural machine is purchased for P100,000 and has a useful life of 12 years. At the end of 12 years, the
salvage value is P13,000. By straight line depreciation, what is the accumulated depreciation at the end of
8 years?
Php 58,000
Edgar borrowed Php 30,000 from a local commercial bank. The loan is charged with a 16% per year simple
interest rate but the interest is to be deducted from the loan at the time the money is borrowed. At the end of one
year, Edgar has to pay Php 30,000. What is the actual rate of interest?
19.05%
A firm could breakeven if it operated at 30% of its capacity. Its annual fixed costs are Php 9,000,000 and the
variable cost of its product is Php 100 per unit. The product is sold for Php 250 per unit. How much would be
the firm’s profit if it operated at full capacity
Php 21,000,000
A machine which costs Php 562,500 when new, has a lifetime of 15 years and a salvage value equal to 20% of its
original cost. If depreciated by the sum-of-the-years digits method, the depreciation charge during the 8th year
of the machine is closest to:
30,000
A firm could breakeven if it operated at 30% of its capacity. Its annual fixed costs are Php 9,000,000 and the
variable cost of its product is Php 100 per unit. The product is sold for Php 250 per unit. How much would be
the firm’s profit if it operated at full capacity?
21 M
What is the engine displacement of 3 ¾ x 4 ¼ inches 4-cylinder engine?
187.8 in3
Consider the following estimates for a project (MARR=14%, n=8 years)
Investment P 900,000
Revenues P 500,000 during the first year, increasing by 10% per year
Expenses P 450,000 per year
Salvage Value 20% of investment
The simple payback period is:
6 years
This is a fairly homogenous group of customers who will respond to marketing mix in a similar way.
Market Segment
A gasoline engine has a thermal efficiency 23%. Tests shows that it uses 1.2 liters of premium gasoline fuel per hour. What is the approximate power it generates?
2.632 kW
A dynamometer test shows that an engine delivers an average output of 50 hp at a speed of 1500 rpm. What
torque is exerted?
237.36 N-m
A drawbar dynamometer shows that the average pull required for a certain machine is 20 kN. If the tractor travels
at 5 kph, what is the power developed?
27.78 kW
An engine with a clearance volume of 350 cm³ and whose bore and stroke are 12 cm and 12 cm, respectively, is
most possibly a:
Gasoline Engine
A pulley that is used to tighten the belt of a drive system.
Idler Pulley
Are a circular cross section belt designed to run in a pulley with a 60 degree V-groove.
Round belts
Type of belt that solved the slippage and alignment problem.
Vee belts (also known as V-belt or wedge rope)
A machine which costs P 100,000 when new, has a lifetime of 15 eyars and a salvage value equal to 20% of its
original cost. If the interest rate is 10% compounded annually, the capital recovery cost of the machine is closest
to:
P 12,518
What is 11010 in decimal?
26
What is the number 73 in binary?
1001001
the specific fuel consumption of a tractor is 0.3 lbs per BHP-hour. If heating value of the fuel is 19500 BTU/lb, what is the brake thermal efficiency of the tractor?
43.5%
An underload tractor drive wheel
rotates at 1200 revolution passing
through a newly cultivated field. At
no load, the tractor drive wheel
rotates at 1125 revolution. What is
the percent slippage of the tractor
drive wheel?
6.25%
An alternator is rated 12volts, 60
ampere. If two 100AH battery is to be
charged from 11 to 12volts, how many
hours the charging of the battery
would take?
3.33 hrs
A 5kW motor is to be driven by an
AC generator. What is the required
surge wattage of the generator?
15 KW
Note: Surge wattage is 3 times greater than the given power rating
What is the steam production rate
of a boiler with 150hp BHP? Consider
an evaporative factor of 1.1.
P= (QsFe)/34.5
150= (Qs1.1)/34.5
Qs= 4 704.5 lb/hr
Where: P- power
Qs-production rate
Fe- evaporative factor
A person is asked to pump water for 4
hours. Compute the power that can be
generated by the person
Pg = 0.35 – 0.092 log ( 4 hr x 60 min/hr)
= 0.13 hp
The fertility of a field is such that maximum corn yields are obtained with a population of 54,000 plants per hectare. The rows are 0.75 m apart and an average emergence of 85 percent is expected. How many seeds per hill should be planted if the hills are 0.5 m apart?
2.3 or 3
Note:
1. Area/hill
2. Hill/ha
3. Seeds emergence/ha (divide by percent of emergence)
4. Seeds/hill
What is the length of the flat-belt pulley drive with
the following data? Diameter of first pulley = 300 mm,
diameter of second pulley = 400 mm, and center distance
of the pulley shaft = 10 meters.
a. 20.15 m
b. 21.05 m
c. 25.01 m
d. None of the above
B
If a sprocket is used for chain, a sheave
is used for .
a. flat belt
b. gear
c. V-belt
d. All of the above
C
The method of treating metal by
applying welding deposit to strengthen the
peg-tooth of a rice thresher.
a. Heat treatment
b. Welding
c. Hard facing
d. None of the above
C
