Farm Tractor Questions and Answers – Electrical Systems

This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Electrical Systems”.

1. What is a starter in an engine?
a) Crank starter
b) To switch on the light
c) To stop the engine
d) Driving

Explanation: The starting motor is a DC motor for starting the engine i.e. to set the crank into the rotation. The power stroke which is third in order of a cycle is the only power-producing stroke and so the motor is needed to start the engine.

2. What is the purpose of starting ring gear?
a) To transfer torque from the motor
b) To transmit power
c) To stop the engine
d) To transmit power through PTO

Explanation: A large ring gear is attached to the periphery of the flywheel for transferring torque to the crankshaft from the starting motor. This will rotate the crankshaft. It is driven by a pinion.

3. What is the rated capacity of battery?
a) Average current extracted
b) Minimum power extracted from the battery
c) Maximum power extracted from the battery
d) Maximum power charged to the battery

Explanation: The rated capacity of the battery is the amount of current produced in a given time. It is often provided by manufacturers. Its unit is ampere-hour.

4. What is the alternator fixed to an engine?
a) Power generator
b) Power saver
c) Power transmitter
d) Transformer

Explanation: The alternator is an alternating current generator when the engine is running. It is driven by the crankshaft and it converts the mechanical energy into electrical energy. The AC is then rectified for utilization.

5. Verify the block diagram.

a) False
b) True

Explanation: The block diagram represents the starting circuit of the tractor. When the key is turned on, the current flows from the battery and the motor gets started. The pinion starts rotation and in turns the flywheel sets into the rotation.

6. The voltage regulator in the electrical system is used for regulating voltage fluctuations.
a) True
b) False

Explanation: Voltage regulator is used in tractor engines to regulate the voltage to avoid damaging of the electrical system. It stabilizes the current from the alternator in the engine.

7. What is the purpose of the current regulator?
a) To regulate current
b) To regulate voltage
c) To increase resistance
d) To increase power

Explanation: The current regulator is also fixed in the tractor engines for regulating the current to avoid damaging the wire and other components. It is similar to the voltage regulator in structure.

8. What is the purpose of a specific gravity test in examining the battery of a tractor?
a) To check the battery’s condition of charge
b) To check the amount of current
c) To check the level of electrolyte
d) To check the voltage

Explanation: When a battery gets discharged, it has low specific gravity and if it is charged, it has high specific gravity. It is the ratio of the density of the testing fluid to the density of water. The test measures the specific gravity of the electrolyte.

9. What is a relay in the electrical circuit of a tractor?
a) Switch
b) Display
c) Ignition switch
d) Regulator

Explanation: The relay is an electrically operated switch which has a range of voltage inputs according to usage. It is used in the tractor systems such as electric horn, solenoids etc.

10. What will be the defect when a starting motor does not crank up the engine?
a) Battery discharged
b) High temperature
c) Low temperature
d) Loose belt drive

Explanation: The battery will be discharged if the motor does not start the engine and it will be the major cause. The battery should be charged for proper operation.

Sanfoundry Global Education & Learning Series – Farm Tractor.

To practice all areas of Farm Tractor, here is complete set of Multiple Choice Questions and Answers.

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