The disadvantages of group drive electric machine is/are

Question

Examoogle · Accepted Answer

Can’t be used for constant operation

Explanation: Group drive refers to a system where a single large electric motor drives multiple machines through a line shaft, pulleys, and belts. While it reduces initial cost, it lacks flexibility because individual machines cannot be controlled independently or operated at varying speeds based on demand.

Working Principle: In a group drive system, a single motor acts as the prime mover for an entire workshop. Mechanical power is transmitted to individual machines via a series of shafts, belts, and gears. Because the motor operates at a constant speed dictated by the shaft, the individual machine processes are coupled, preventing independent control and making the setup inefficient for variable-speed applications.

Key Formulas: $P_{total} = \sum P_{i} + P_{losses}$ — Total power required by a group drive including mechanical transmission losses

Key Points: High transmission losses due to belts, gears, and shafts.; Poor speed control as all machines are tied to a single motor speed.; If the main motor fails, the entire production line stops.; High maintenance requirement due to complex mechanical linkages.

Advantages: Lower initial capital cost compared to individual drives; Suitable for uniform load profiles

Disadvantages: Inflexible speed control; High energy loss in transmission; Single point of failure for entire workshop; High noise and vibration

Applications: Textile mills; Old workshops with constant-speed heavy machinery

Additional Info: Group drive was common in early industrialization but is largely obsolete due to advancements in Individual Drive systems.. Options A and B (Low efficiency and low overload capacity) are actually disadvantages of the system, but the inability to control constant operation (or independent operation) is the defining limitation of its architecture.

Answer: C is correct — The main drawback of a group drive system is the lack of individual control and the inability to operate specific machines independently of the master motor.

Exam Tip: In competitive exams, remember that 'Individual Drive' is the preferred modern alternative because it provides independent control, higher efficiency, and better reliability for each machine.

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