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- Question 1 of 16
Bypass valve in a compressed oxygen type self-contained breathing apparatus is meant toCorrectIncorrect
- Question 2 of 16
Given S is the setting load and Y is the yield load of a hydraulic prop, the correct relationship isCorrectIncorrect
- Question 3 of 16
Solution of the differential equation dy/dx = ky follows exponential decay (where k is a constant) for x∈[0,∞] ifCorrectIncorrect
- Question 4 of 16
The value of k for which the vectors a = 2i – 3j and b = k i + 4j are orthogonal to each other is ___CorrectIncorrect
- Question 5 of 16
Which one of the following is the most likely mode of slope failure for waste dumpCorrectIncorrect
- Question 6 of 16
The occurrence of head in a single toss of an unbiased coin is given by a random variable X. The variance of X isCorrectIncorrect
- Question 7 of 16
The divergence of the vector v = (x + y)(−yi + xj) isCorrectIncorrect
- Question 8 of 16
For Indian coal mines, the ‘maximum allowable concentration’ of respirable dust containing 7.5% free silica in mg/m3 isCorrectIncorrect
- Question 9 of 16
Given k is the thermal conductivity, p is density and c is specific heat of a rock sample, the thermal diffusivity of the rock sample isCorrectIncorrect
- Question 10 of 16
Cyclone, bag filter and scrubber can be used for control ofCorrectIncorrect
- Question 11 of 16
A mine waste dump of pH 5.2 can be neutralized by addingCorrectIncorrect
- Question 12 of 16
A piece of coal sample weighs 10 kg in air and 2 kg when immersed in water. The specific gravity of the coal sample isCorrectIncorrect
- Question 13 of 16
In a borehole log of 1.2 m in length, recovery of rock cores in cm is given below 20, 8, 15, 8, 8, 4, 3, 9, 10, 1, 5, 10
The RQD in percentage isCorrectIncorrect
- Question 14 of 16
An underground coal mine panel produces 520 tonnes per day deploying 220, 200 and 192 persons in three shifts. As per CMR 1957, the minimum quantity of air in m3/min to be delivered at the last ventilation connection of the panel isCorrectIncorrect
- Question 15 of 16
In a PERT network, the activities on the critical path are a, b and c. The standard deviations of the durations of these activities are 2, 2 and 1 respectively. The variance of the project duration isCorrectIncorrect
- Question 16 of 16
A dry rock sample of diameter 50 mm and length 100 mm weighs 300 g. After saturating in brine solution of specific gravity 1.05, its weight increased to 330 g. The porosity of the rock sample in percentage isCorrectIncorrect