Mining methods in India

1) How many percent shares does the Union Government of India   owns in CIL ? a) 85.65%             b) 95.65%            c) 79.65%             d) 75.65% 2) When was CIL was conferred the   Maharatna   status by the Union Government of India? a) April 2011       b) Nov 2011        c) April 2012        d) Nov 2012 3) When was CIL was included in the 30-member   BSE SENSEX   ? a) 8 August 2010               b) 8 August 2011               c) 8 August 2012    d) 8 August 2013 4) Production from open cast mines of CIL during 2014-15 was to the tune of _________% of total production of 494.24 MT. a) 82 %  b) 85 % c) 93 %                  d) 97% 5) How many coal washeries does CIL operate ? a) 10      b) 20      c) 15       d) 25 6) How many non-coking coal washeries are presently operative in CIL? a) 12      b) 3        c) 10       d) 5 7) Which are the two companies which do not produce coking coal ? a) NCL & SECL    b) NCL & MCL               

RAW COAL ASH% AVAILABLE AT PRESENT IN INDIA Type of coal RC Ash% limit Coking Coal About 35% Non-Coking Coal About 40-45%   Among the above consumers, majority of demand of coal is by steel & power sector. Steel sector require coking coal of ash% within a range of 18+0.5 whereas power sector require non-coking coal of ash% within a range of 33.5+0.5. Why Indian Coals contain High Ash? Indian coals contain high ash content because of its formation thro’ drift origin.   Moreover, the quality of Run of Mine  (RoM) coal from Indian mines is             continuously deteriorating due to  increased Opencast mining operation             leading to admixtures of stone/ shale with coal.                 Major Pollutants in Coal Ash : §     Primary Minerals resulting Inherent Ashes §     Secondary Generated Minerals resulting Intermediate   Ashes §     Inorganic rock forming External Ashes    

1)              DC motor Comstruction - Synchronous motor Induction Motor         1. Centrifugal switch is absent in which of the single phase induction motor? 1.     Shaded pole motor. 2.     PSC (permanent split capacitor) motor. 3.     Split phase motor. 4.     None of the above. 2)              A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m 2 . Calculate the force experienced by the conductor, when the armature current is 5 Amp? 1) 15 N. 2) 20 N. 3)   Can’t be determined. 4)   None of these. 3) In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 1.     1.0. 2.     1.5 to 2. 3.     2 to 3. 4.     3 to 5. 4)           The use of double squirrel cage winding on the rotor provides 1.   low noise. 2.   reduced starting torque. 3.   a large starting torque. 4.   higher efficiency. 5)           Which of the following machine is invaria