Question 1
Marks : +2 | -2
Pass Ratio : 100%
The train value of a gear train is
Explanation: Train value = Speed of the last driven or follower/Speed of the first driver.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In a simple gear train, if the number of idle gears is odd, then the motion of driven gear will
Explanation: The speed ratio and the train value, in a simple train of gears, is independent of the size and number of intermediate gears. These intermediate gears are called idle gears, as they do not effect the speed ratio or train value of the system.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
In a gear train, when the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, is called
Explanation: In an epicyclic gear train, the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
In a clock mechanism, the gear train used to connect minute hand to hour hand, is
Explanation: The reverted gear trains are used in automotive transmissions, lathe back gears, industrial speed reducers, and in clocks (where the minute and hour hand shafts are co-axial.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A differential gear in an automobile is a
Explanation: The epicyclic gear trains are useful for transmitting high velocity ratios with gears of moderate size in a comparatively lesser space. The epicyclic gear trains are used in the back gear of lathe, differential gears of the automobiles, hoists, pulley blocks, wrist watches etc.