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Consider two shafts connected with two gears as per the following options: 1. One on each shaft 2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only 3. Through an intermediate gear mounted on an intermediate shaft, with the intermediate shaft having two gears, whereas the other shafts have one gear each Which of the above represent(s) a simple gear train?

Consider two shafts connected with two gears as per the following options: 1. One on each shaft 2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only 3. Through an intermediate gear mounted on an intermediate shaft, with the intermediate shaft having two gears, whereas the other shafts have one gear each Which of the above represent(s) a simple gear train? Correct Answer 1 and 2 only

Simple gear train: When every gear axes are fixed relative to the fixed frame and, there is only one gear on each shaft. The number of shaft may be any.

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Compound gear train: When any shaft have more than one gear (first shaft or second shaft or intermediate shaft) i.e. two gear have same angular velocity, the gear drive is called compound gear drive. 

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Reverted gear train: When the input and the output shafts are co axial or parallel offset the gear drive is known as Reverted gear trains.

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Epicyclic gear train: When the gear train is having relative motion of axes it is called the epicyclic gear train. The axis of at least one of the gears also move relative to the frame.

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