This set of Farm Machinery Interview Questions and Answers for Experienced people focuses on “Diesel Engine Vs. Petrol Engine – 2”.
1. 1 kg of air is compressed from 40 m3 volume under 100 kPa pressure to 1 m3 volume. What will be the pressure at constant temperature?
a) 5000 kPa
b) 6170 kPa
c) 3215 kPa
d) 4000 kPa
View Answer
Explanation: Using the relation
P1V1 = P2V2
P2 = \(\frac{P_1*V_1}{V_2} = \frac{100*40}{1} \)
P2 = 4000 kPa.
2. A tractor tyre contains 28 litre of air at 184 kPa pressure and 27°C temperature. How much air does the tyre contain?
a) 0.0599 kg
b) 0.599 kg
c) 55.059 kg
d) 5.99 kg
View Answer
Explanation: Using the formula
PV=nRT
n=\(\frac{PV}{RT}=\frac{184*10^3*28*10^{-3}}{8.314*300}\)=2.06
Air in tyre = 2.06*\(\frac{29}{1000}\) = 0.0599 kg.
3. What will be the temperature, at which 28g nitrogen occupies a volume of 10 litres at 2.46 atmospheric pressure?
a) 319.48 K
b) 456.23 K
c) 299.64 K
d) 123.45 K
View Answer
Explanation: Using the formula
PV=\(\frac{W}{M}\)*R*T
T=\(\frac{P*V*M}{W*R}=\frac{2.46*10*28}{28*0.082}\) = 299.64 K.
4. 7 gram of gas occupies a volume of 4.1 litre at 300°K temperature and 1 atmospheric pressure. What will be the molecular mass of gas?
a) 78.19
b) 42.05
c) 35.65
d) 18.19
View Answer
Explanation: Using the formula
PV=\(\frac{W}{M}\)*R*T
M=\(\frac{WRT}{PV}=\frac{7*0.082*300}{1*4.1}\)=42.05.
5. A cylinder can withstand the L.P.G. at 16.7 atmospheric pressure, if at any time instant the inside pressure of L.P.G. becomes 13 atmosphere pressures at 27°C. Then what will be the temperature at which it will explode?
a) 116.7°C
b) 114.1°C
c) 112.1°C
d) 111.6°C
View Answer
Explanation: Since volume of cylinder remains constant, hence using the formula
\(\frac{P1}{T1}=\frac{P2}{T2}\)
\(\frac{16.7}{T1}=\frac{13}{300} \)
T1 = 385.3K
T1 = 112.1°C.
6. The first I.C. engine was invented by _______
a) Nikolaus Otto
b) James Watt
c) Hudson
d) Norman
View Answer
Explanation: The first commercially successful internal combustion engine was created by Etienne Lenoir around 1859 and the first modern internal combustion was created in1876 by Nikolaus Otto.
7. The function of piston pin is to _________
a) Absorb the cylinder heat
b) Join the connecting rod to the piston
c) Increase the speed
d) Joint wheel and connecting rod
View Answer
Explanation: In IC Engines, the main function of piston pin or gudgeon pin is to join the connecting rod to the piston. By connecting piston pin to the connecting rod it provides a pivot point between connecting rod and piston.
8. Where are manifolds fitted?
a) The lower part of cylinder
b) The intake valves
c) The exhaust valves
d) The side of the cylinder
View Answer
Explanation: An inlet manifold is the of an engine that supplies fuel/air mixture to the cylinders. In contrast, an exhaust manifold collects the exhaust gases from multiple cylinders into a smaller number of pipes-often down to one pipe.
9. What is the clearance between rocker arm and valve stem is known as _______
a) Valve clearance
b) Sleeve
c) Tappet clearance
d) Buffer space
View Answer
Explanation: Tappet clearance is the clearance between the rocker arms and the point where they rest on the valves. Usually both the surface are flat surfaces. In four-stroke engines, rockers arms arrangement opens and closes the inlet and outlet valves.
10. What is the detachable portion of engine, which covers the upper end of the cylinder known as ______
a) Cylinder head
b) Ignition cell
c) Combustion cell
d) Manifold
View Answer
Explanation: In an internal combustion engine, the cylinder head sits above the cylinder on top of the cylinder block. It closes in the top of cylinder, forming the combustion chamber.
Sanfoundry Global Education & Learning Series – Farm Machinery.
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