Farm Machinery Questions and Answers – Working Principle of Battery Ignition System

This set of Farm Machinery Multiple Choice Questions & Answers (MCQs) focuses on “Working Principle of Battery Ignition System”.

1. The primary winding of ignition coil is made of ________
a) 1 mm diameter copper wire
b) 0.8 mm diameter copper wire
c) 0.6 mm diameter copper wire
d) 1.2 mm diameter copper wire
View Answer

Answer: b
Explanation: Primary winding of the transformer is the coil that draws power from the external source. The primary winding of ignition coil is made of 0.8 mm diameter copper wire.

2. Which of the following has highest vaporizing temperature?
a) H.S.D. oil
b) Petrol
c) Water
d) Kerosene
View Answer

Answer: a
Explanation: Vaporization temperature is the temperature at which the liquid is converted into vapor without any change in temperature.

3. What should be the gap of spark plug?
a) 1.2-1.53 mm
b) 2.5-2.85 mm
c) 0.5-0.85 mm
d) 3.15-3.45 mm
View Answer

Answer: b
Explanation: In I.C. engine, the function of spark plug id to make jump of high voltage current and to ignite the mixture, i.e., charge, within the cylinder. It is used in petrol engines. the gap of spark plug should be 2.5-2.85 mm.
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4. What is the range of a condenser in an I.C. engine?
a) 0.15-0.45 ΜF
b) 0.15-0.45 ΜF
c) 0.15-0.45 ΜF
d) 0.15-0.45 ΜF
View Answer

Answer: a
Explanation: It is used for quick reduction of magnetic field in the coil to obtain an extremely high voltage current. In internal combustion engines, generally, the range of condensers varies from 0.15 to 0.45 MF

5. Electrolyte used in storage battery consists of _________
a) 25% H2SO4 and 75% distilled water
b) 5% H2SO4 and 95% distilled water
c) 35% H2SO4 and 65% distilled water
d) 45% H2SO4 and 55% distilled water
View Answer

Answer: c
Explanation: When an electrolyte is dissolved in a polar solvent (like water), the resulting solution allows conduction of electricity where in the dissolved electrolyte separates into cations and anions. A storage battery is a battery which is rechargeable. Electrolyte used in storage battery consists of 35% H2SO4 and 65% distilled water.
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6. Maximum economy of engine, is obtained at the air fuel ratio of _________
a) 13.5:1 to 15:1
b) 13.5:1 to 15:1
c) 8:1 to 15:1
d) 7:1 to 10:1
View Answer

Answer: a
Explanation: Air-fuel ratio (AFR) is the ratio of mass of air to a solid or liquid or a gaseous fuel which is present during combustion. This combustion shall take place in a controller environment such as inside an IC engine or an industrial furnace. Maximum economy of engine, is obtained at the air fuel ratio is 13.5:1 to 15:1.

7. The lowest speed of engine at which the engine runs smoothly is called ________
a) at least speed
b) threshold speed
c) minimum speed
d) idling speed
View Answer

Answer: d
Explanation: Idle speed is the rotational speed of an engine when the engine is idling. An engine is said to be idle when the engine is not coupled from its drivetrain and the pedal for throttling is not in a depressed position. Idle speed is usually measured in RPM (revolutions per minute). At this speed, the engine will be generating enough power to run smoothly but it won’t be sufficient to perform any useful work.
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8. Horse power of engines varies with ___________
a) air fuel ratio
b) amount of fuel in air fuel mixture
c) amount of air in air fuel mixture
d) engine speed
View Answer

Answer: a
Explanation: Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The horsepower of an engine is the power output of the engine, usually available at the crankshaft. So, if an engine is rated at 100 HP, it means that at the crankshaft of the engine, 100 horsepower of mechanical power is available when the engine is operating.

9. Preignition can be caused due to presence of ______
a) excess lubricants in cylinder
b) gum in fuel
c) over-heated spark plug
d) higher volume of air in air fuel mixture
View Answer

Answer: c
Explanation: Pre-ignition is a condition or situation in which the fuel and air mixture in spark plugin ignites before the timed spark and this can happen due to contact with hot surface. So, if the spark plug is over heated or its tip is too hot, it can result in pre-ignition.
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10. In magnetic ignition system, the primary current is produced by __________
a) battery
b) magnet
c) electrical current
d) ice
View Answer

Answer: b
Explanation: A magnetic ignition system provides current primarily for the spark-ignition system of a petrol engine. This is achieved by producing pulses of high voltage for the spark plugs. In such systems, the primary current is produced by the use of a Magnet.

Sanfoundry Global Education & Learning Series – Farm Machinery.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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