AGRICULTURAL ENGINEERING PREBOARD EXAM 2014 PREPARED BY: ENGR. ROLAND J. MACANA Flashcards
(90 cards)
A refrigeration equipment fabricator sold an ice drop making machine with the condition that in
case the machine will not be able to produce the guaranteed capacity, he will deduct from the
agreed price of the machine the loss of revenue that the buyer will incur during the economic life of
the machine which is set at 5 years., plus 12% cost of money. One month after the machine was
delivered, the buyer complained to the fabricator that he is not getting the guaranteed production.
After series of test, it was determined that the buyer would be losing P4000 worth of unrealized
sales per year. Assuming no increase in operation cost if guaranteed production were attained, how
much must the buyer deduct from the agreed price of the machine?
P14,419.10
It consists of two gangs wherein one gang is located behind the other at an angle and the harrow
is operated in an offset position in relation to the tractor centerline
Offset Disc Harrow
In Agricultural Machinery Method of Sampling, certain color is used for specific function such as
hazard warning display
Red
In Agricultural Machinery Method of Sampling, certain color is used for specific function such as
failure or serious malfunction; requires immediate attention
Red
It is a system in which tillage of the total soil surface is performed in such a way that plant residue
is specifically left on or near the soil surface
Mulch Tillage
The peak transmission efficiency of the tractor shall be at least___
85%
The noise emitted by the tractor measured 50 mm away from the operator’s ear level shall not be
more than ___db (A).
92
The peak transmission efficiency of the axle-driven rotary tiller shall be at least ____.
80%
It is part of the plow which lifts, inverts and throws the furrow slice to one side
Moldboard
It is part of the plow which lifts, inverts and throws the furrow slice to one side
Moldboard
Determine the time in hours to plow a 3-ha field using a 15-cm animal-drawn plow at a speed of
4 kph and efficiency of 75%
2.75 Days
In an ideal Otto engine, the combustion of fuel occurs at
constant volume
The ideal air-fuel ratio for using kerosene as an engine fuel is
15:1
Sprayers are used primarily for the application of
pesticides
Which of the following does not belong to the group of positive displacement pumps?
propeller pump
It helps keep engine running, by its inertia, during idle strokes (intake, compression, exhaust)
Flywheel
Receives power generated in the cylinder.
Piston
Engine size. This is given by the bore and stroke of the engine. For instance, a 100 mm X 124 mm.
Given the above engine size, compute the piston displacement. Compute the total cylinder volume in the problem above. Compute the Compression ratio in problem above (given that CV= PD/6)
piston displacement 973, 400 cubic mm
cylinder volume 1, 135, 633.30 cubic mm
Compression ratio 7
The piston moves from TDC to BDC. The inlet valve is opened to allow the fuel mixture to enter
and fill the partial vacuum created by the movement of the piston
Intake Stroke
The piston returns from BDC to TDC, sweeping out burnt fuel through the exhaust valve which
has been opened.
Exhaust Stroke
The intake valve is closed, the exhaust valve remains closed and the piston moves from BDC to
TDC compressing the fuel mixture into the clearance volume, thereby raising its temperature.
Compression Stroke
When the piston approaches TDC during the compression stoke, a spark ignites the fuel mixture
and the expanding gases drive the piston from TDC to BDC
Power Stroke
It is a device used to connect or disconnect the source of power to the rest of the transmission
system
clutch
Suppose a plough 150 mm wide is furrowing 60 mm deep in a particular soil that offers a
resistance of 2 N per square centimeter of cross section. Calculate the total draft of the plough.
180 N