List of practice Questions

The act performed to enrich or impoverish, either intentionally or accidentally, the mineral samples taken for assaying is known as
Which one of the following does not belong to the direct operating cost of a mine?
The feasible region of an LP problem in two variables is defined by $ X_1 \leq 4.5, \quad X_2 \leq 3.7, \quad \text{and} \quad X_1 + X_2 \leq 7.0 $ along with the non-negativity constraints. The number of corner feasibility points are:
The computation of Graham’s ratio requires the concentration values of
A mine disaster can be defined as an accident resulting in number of deaths of utmost
If an underground coal mine produces 60000 tonnes coal per month, as per CMR 2017, the number of under managers needed for the mine is
The maximum wet-bulb temperature at working faces as required under mines regulations is
The ratio of the theoretical power input (P$_1$/P$_2$) of two centrifugal fans having the same specific speed and operating at same speed is given by
Total number of injuries in an opencast coal mine employing 900 persons is 9 in a year 2023. As per DGMS norms, the injury rate per 1000 persons employed is
A Bulkhead door is installed in the development heading of a coal mine to control
Major source of heat in underground coal mines is
Natural ventilation can be caused by
Which of the following ventilation system is adopted for continuous miner headings?
Kata thermometer is used to measure
Incubation period is not related to
As per the DGMS norms, the severity index is a measure of
Stone dust barriers in underground coal mines are used to arrest
At any particular place the relation between the suspended particulate matter (SPM) and respirable particulate matter (RPM) is
As per the DGMS norms, warning level of noise for the worksite area is
The relation between COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand) is
A mine waste dump of pH = 5.2 can be neutralized by adding
Nystagmus is a miner's disease associated with
Sum of static pressure and velocity pressure is known as
From a coal seam of a mine 1000 tonnes of coal is produced per day. The seam has inflammable gas emission rate of 14000 m$^3$ per day. Percentage of inflammable gas in general body of the air is 0.14. The gassiness of the seam is
Considering `I' as `intake' and `R' as `return', the ventilation symbol for the shaft-bottom air-lock in a coal mine is