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Farm Machinery Mcqs

Q:

In which of the following condition the engine is known as over-square engine?

A) d < L B) d > L
C) d=0 D) L=0
 
Answer & Explanation Answer: B) d > L

Explanation: L/d, known as stroke to bore ratio, is an important parameter in classifying the size of the engine. If d < L, it is called under-square engine. If d = L, it is called square engine. If d>L, it is called over-square engine.

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61
Q:

A four-stroke diesel engine operating at 1200 rpm uses 0.1 kg of fuel in 5 minutes and has the brake specific fuel consumption equals to 0.1910 kgBHPh. Calculate the torque developed.

A) 6.5 kg-m B) 8 kg-m
C) 7.5 kg-m D) 5 kg-m
 
Answer & Explanation Answer: C) 7.5 kg-m

Explanation: N = 1200/2 = 600
BHP = 2?pT/4500
= 0.837T
Break Sp. Fuel Consumption = 0.1*60/0.837T*5
0.1910 = 0.1/0.837T*5
T=7.5 kg-m.

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164
Q:

Which of the following is an indicator of the combustion speed of diesel fuel and compression needed for ignition?

A) Cetane Number B) Octane Number
C) Calorific Value D) Pre-Ignition
 
Answer & Explanation Answer: A) Cetane Number

Explanation: Octane number is the ignition quality of petrol. Calorific value is the energy contained by fuel determined by complete combustion. Pre-ignition is the premature combustion of the fuel air mixture.

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78
Q:

Which is largest piston driven aircraft having 36 cylinders?

A) DKW B) Lycoming R-7755
C) Saab 92 D) Pratt and Whitney R-4360
 
Answer & Explanation Answer: B) Lycoming R-7755

Explanation: DKW and Saab 92 are examples of large cars having two cylinders or two-stroke engines. Pratt and Whitney R-4360 is an example of an aircraft having 28 cylinders. Lycoming R-7755 is an aircraft which had 36 cylinders, making it the largest piston driven aircraft.

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55
Q:

Rapid explosion of air-fuel mixture within the cylinder, when ignited by a spark is known as _______

A) constant heat combustion B) constant pressure combustion
C) constant volume combustion D) cut off ratio
 
Answer & Explanation Answer: C) constant volume combustion

Explanation: There are two ways in which combustion takes place in the cylinder. When there is a rapid explosion of air- fuel mixture within the cylinder when it is ignited by spark, is called constant volume combustion and when there is a slow burning when the fuel is injected into highly compressed heated air, then it is known as constant pressure combustion.

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