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- Question 1 of 17
##### 1. Question

A Dragger Gas Mask DOES NOT filter

CorrectIncorrect - Question 2 of 17
##### 2. Question

A system consists of four elements A, B, C and D which are connected functionally in a parallel configuration. The individual reliability of the elements is 0.80, 0.82, 0.85 and 0.90 respectively. The reliability of the system is

CorrectIncorrect - Question 3 of 17
##### 3. Question

The blasting technique used for controlled throw of overburden is known as

CorrectIncorrect - Question 4 of 17
##### 4. Question

The stoping method, where a large part of blasted ore is allowed to accumulate in the stope to serve the purpose of providing working platform for stoping as well as to support the wall-rock, is known as

CorrectIncorrect - Question 5 of 17
##### 5. Question

An iron ore mine recorded an average of 3 accidents per month. The number of accidents is distributed according to Poisson distribution. The probability that there will be exactly 2 accidents per month is

CorrectIncorrect - Question 6 of 17
##### 6. Question

Match the following:

Equipment Component

P Scraper 1 Dribble belt

Q Dragline 2 Dipper stick

R Bucket wheel excavator 3 Fair lead

S Rope shovel 4 BowlCorrectIncorrect - Question 7 of 17
##### 7. Question

The torque in N-m of a winder motor is described by the relationshipT =1450 − 3.2ω , where, ω is the angular speed of the motor in rad/s. If the shaft is rotating at a speed of 1450 rpm, the power of the motor in kW is

CorrectIncorrect - Question 8 of 17
##### 8. Question

An investment of Rs. 10,000, compounded annually, is estimated to return Rs. 20,000 after 6 years from the date of investment. The expected rate of return on this investment in percentage is

CorrectIncorrect - Question 9 of 17
##### 9. Question

A series of triaxial tests of sandstone samples reveal the cohesion and the angle of internal friction as 21.65 MPa and 30° respectively. Based on the assumption that the sandstone samples follow the Mohr-Coulomb’s failure criteria, the tensile strength in MPa is

CorrectIncorrect - Question 10 of 17
##### 10. Question

The adjusted values of departure and latitude for a traverse line AB obtained in a field survey of a mine are 225.520 m and 388.835 m respectively. The length in m and azimuth of line AB are

CorrectIncorrect - Question 11 of 17
##### 11. Question

In a longwall panel, the main gate road is 1000 m long, 4.5 m wide and 2 m high. The gate road is to be used for airflow at the rate of 17 m3/s. Considering a coefficient of resistance of airways of 0.01, the pressure in Pa required to maintain the airflow in the gate road is

CorrectIncorrect - Question 12 of 17
##### 12. Question

Match the following:

Mining system Face supports

P Mechanized longwall in flat seam 1 Cable bolting

Q Blasting gallery method 2 Shield support

R Mechanized longwall in steep seam 3 Alpine breaker line support

S Wangawilli method for 3 m thick coal seam 4 Troika shield supportCorrectIncorrect - Question 13 of 17
##### 13. Question

A circular tunnel of 1.85 m radius is driven in rock in a hydrostatic stress field of 20 MPa. The tunnel lining is provided before occurrence of any rock deformation. The shear modulus of rock is 2 GPa and the modulus of elasticity of lining material is 3 GPa. Assuming both rock and lining behave elastically, the radial pressure on the rock and lining interface in MPa is

CorrectIncorrect - Question 14 of 17
##### 14. Question

The components of state of stress at a point in x−y plane are given as xx = 5MPa, yy = 10MPa and xy = -2MPa. The sum of the principal stresses acting on the x−y plane in MPa is

CorrectIncorrect - Question 15 of 17
##### 15. Question

A circular curve has a radius of 200m and deflection angle of 65 degree.The length of the curve in m is

CorrectIncorrect - Question 16 of 17
##### 16. Question

The weight strength of ANFO of specific gravity 0.8 is 912 kcal/kg. The weight strength of an emulsion explosive of specific gravity 1.2 is 850 kcal/kg. Bulk strength of the emulsion explosive relative to ANFO in percentage is

CorrectIncorrect - Question 17 of 17
##### 17. Question

In a cut-and-fill stope, the main purpose of back filling is to

CorrectIncorrect