Machine hour rate is obtained by dividing the total running expenses of a machine during a particular period by the . . . . . . . .

number of hours
number of products produced
number of workers
wages

The correct answer is A. number of hours.

Machine hour rate is the cost of running a machine for one hour. It is calculated by dividing the total running expenses of a machine during a particular period by the number of hours the machine was run during that period.

The other options are incorrect because they do not measure the amount of time that a machine is run. The number of products produced is a measure of the output of a machine, the number of workers is a measure of the labor input, and wages are a measure of the cost of labor.