This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Engine Performances”.
1. What is the mean effective pressure?
a) Pressure on the piston
b) Pressure in the combustion chamber
c) Pressure in the one cylinder
d) Total pressure in all cylinders
View Answer
Explanation: The mean effective pressure is the pressure acting on the piston during the power stroke. It is considered for comparing the performances of different engines. It is independent of engine displacement.
2. How is the mean effective pressure calculated?
a) Work done / heat supplied
b) Work done / heat removed
c) Work done / displacement volume
d) Work done / Pressure
View Answer
Explanation: Mean effective pressure is calculated by dividing the net work done of the engine with displacement volume. Displacement volume is the piston displacement calculated for all the cylinders of an engine. It is also calculated by using varied formulas according to the otto, diesel and dual combustion cycle.
3. What is called as the power measured in crankshaft?
a) Overall power
b) Crank power
c) Brake power
d) Total power
View Answer
Explanation: Brake power is the power measured in the crankshaft of a tractor engine. It is often called as Brake horsepower when the power is denoted in hp. It is measured using a brake dynamometer.
4. Indicated power is the gross power developed in the cylinder.
a) False
b) True
View Answer
Explanation: Indicated power is the power developed by the combustion of fuel in the combustion chamber. It is also called as Indicated horsepower. The power is received and transmitted by the piston.
5. How is the power loss occurred when the indicated power is transmitted by piston?
a) Friction
b) Vibration
c) Noise
d) Heat
View Answer
Explanation: There will be a loss of power due to friction. There is also a term called friction power, which means the power consumed by the parts of the engine due to friction. It is also called as friction horsepower.
6. What is the average pressure developed in the combustion chamber during the operating cycle?
a) Indicated mean effective pressure
b) Mean effective pressure
c) Combustion Pressure
d) Operating pressure
View Answer
Explanation: The indicated mean effective pressure is the average pressure produced in the combustion chamber during the operation. It is further categorized as gross indicated mean effective pressure and net indicated mean effective pressure.
7. The horsepower is not influenced by atmospheric pressure and temperature.
a) False
b) True
View Answer
Explanation: The horsepower is affected by atmospheric pressure and temperature. The measured horsepower is called as observed HP and the observed value is conformed to the is operating conditions for obtaining corrected horsepower.
8. What is the engine torque?
a) Turning force
b) Static force
c) Linear force
d) Perpendicular force
View Answer
Explanation: The torque is a significant measurement of engine performance because tractor engines are made for producing higher torques. It is a force which makes the turning effect. In an engine, it is created in the crankshaft by the piston’s downward movement during the power stroke.
9. What is the drawbar power in a tractor?
a) Power measured in crankshaft
b) Power measured in drawbar
c) Power measured in the cylinder
d) Power measured in implement
View Answer
Explanation: The power measured in the drawbar is called as drawbar power. The drawbar or hitch point is the point where the farm implements are attached. It is the power available for pulling the loads.
10. What is power take-off horsepower?
a) Power at PTO unit
b) Power at drawbar
c) Power at the engine output
d) Power in the implement
View Answer
Explanation: The power take-off (PTO) is a power measured at the PTO shaft of a tractor. PTO is a splined shaft transmitting power from engine to the mounted implement. The rpm of the PTO will be 540 rpm and 1000 rpm according to the ISO standard.
11. What is the rated power of an engine?
a) Power measured in the belt
b) Power measured in the PTO
c) Power measured in the drawbar
d) Power measured at the rated speed
View Answer
Explanation: The rated power is the power of an engine measured at the rated speed which is specified by the manufacturers. This is for testing purpose of tractors. The rated speed is the rpm of an engine when the maximum power is produced.
12. Find the torque of the tractor engine with 2000 rpm and brake power of 70kw.
a) 331.225 N-m
b) 332.225 N-m
c) 334.225 N-m
d) 333.225 N-m
View Answer
Explanation: Brake power = 2π.N.T / 60 where N (rpm) is in minute, T is in N-m and B.P is in watts.
T = 60 * B.P / 2π.N
T = 60 * 70000watts / 2π * 2000
T = 334.225N-m
13. Find the indicated power of the tractor engine having brake power 60kw and friction power of 5kw.
a) 55
b) 50
c) 60
d) 65
View Answer
Explanation: Indicated power = brake power + friction power
= 60 + 5
= 65 kw
Sanfoundry Global Education & Learning Series – Farm Tractor.
To practice all areas of Farm Tractor, here is complete set of Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
