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Disadvantages of group drive
Low efficiency
Low overload capacity
Can not be used for the constant operation
All of the above
Can not be used for the constant operation
A group drive system employs a single large motor to drive multiple machines via a common line shaft and pulleys. The primary disadvantage highlighted is that it lacks the flexibility required for constant, individual speed or precise operation of specific machines independent of the rest of the group.
A group drive system employs a single large motor to drive multiple machines via a common line shaft and pulleys. The primary disadvantage highlighted is that it lacks the flexibility required for constant, individual speed or precise operation of specific machines independent of the rest of the group.
PtotalтАЛ=тИСPiтАЛ+PlossтАЛ тАФ total power consumption including mechanical transmission losses
The system utilizes a central prime mover connected to a main shaft through belts or gears. Because all machines are mechanically coupled, changing the speed of one machine is impossible without affecting the entire group, leading to significant transmission losses through friction and belt slip.
Group drives are obsolete in modern industrial setups.
Mechanical losses are high due to friction in shafts, bearings, and belts.
Individual control of machine speed is impossible.
Failure of the main motor shuts down the entire production line.
Initial cost is lower due to the use of a single large motor
Less maintenance compared to multiple small motors in the early 20th century
Low efficiency due to transmission losses
Inflexible speed control for individual machines
Low overload capacity as the motor must be sized for peak collective load
High risk of total production stoppage upon motor failure
Old textile mills
Line shaft driven wood-working shops
The constant operation issue refers to the inability to maintain specific constant speeds for individual machines independently, making it unsuitable for modern automation.
Option A and B are also disadvantages, but C is the most defining characteristic regarding operational versatility.
C is correct тАФ group drive systems prevent individual machines from operating at their optimal speeds, rendering them unsuitable for applications requiring variable or independent constant speed control.
In competitive exams, remember that Group Drive is contrasted with Individual Drive (one motor per machine), which is the current industrial standard for efficiency and control.