Which of the following is an abnormal cause of Idle time:

Time taken by workers to travel the distance between the main gate of factory and place of their work
Time lost between the finish of one job and starting of next job
Time spent to meet their personal needs like taking lunch, tea etc
Machine break downs

The correct answer is D. Machine breakdowns.

The other options are all normal causes of idle time.

  • Time taken by workers to travel the distance between the main gate of factory and place of their work is a normal cause of idle time, as it is necessary for workers to get to their workstations.
  • Time lost between the finish of one job and starting of next job is a normal cause of idle time, as it takes time to prepare for the next job.
  • Time spent to meet their personal needs like taking lunch, tea etc is a normal cause of idle time, as workers need to take breaks to eat and drink.

Machine breakdowns are an abnormal cause of idle time, as they are not planned and can cause significant disruption to production.