SCU- MINING MACHINERY DGMS EXAM-2021
Question Paper _ Key of DGMS SECOND CLASS UNRESTRICTED UNDER CMR - MINING MACHINERY
1) The insulation of modern EHV lines is designed based on
A) corona
B) all of the above
C) switching voltage
D) the lightning voltage
E) radio interference
2) The power stated on the name plate of any motor is always
A) the output power at the shaft
B) the gross power
C) the power drawn in kVA
D) the power drawn in kW
E) Both (A) and (C)
3) Keps are used in which type of winding system
A) Friction winder
B) Direct haulage
C) Koepe winding
D) Drum winding
E) Endless haulage
4) The process of chamfering the entrance of a drilled hole is known as
A) none
B) counter-sinking
C) counter-fillet
D) trepanning
E) counter-boring
5) Minimum duration for examination of travelling roadways,(In days)
A) 14
B) 7
C) 5
D) 21
E) 2
6) The utilization voltages used in below ground coal mines are:
A) 240 V
B) 550 V
C) All of the above
D) 125 V
E) 1100 V
7) Another name for double belt conveyor is
A) Trunk belt Conveyor with loop take up arrangement
B) Rectangular riffles Conveyor
C) Sandwich Conveyor
D) Trunk belt Conveyor
E) Herringbone riffles Conveyor
8) The value of the universal gas constant in kJ/kmol K is
A) 6.314
B) 9.314
C) 7.314
D) 8.314
E) 10.314
10) Discharge capacity of the reciprocating pump is that of the centrifugal pump
A) same as
B) higher than
C) unpredictable
D) lower than
E) all the above
11) MCCB stands for:
A) Miniature Current Circuit Breaker
B) Maximum Current Circuit Breaker
C) Maximum Case Circuit Breaker
D) Moulded Case Circuit Breaker
E) Moulded Cabinet Circuit Breaker
12) Name the method of artificial respiratory resuscitation injury/burns in chest or belly?
A) None of the above
B) Resuscitation under cardiac arrest
C) Mouth to mouth method
D) Holgen-Nelson method
E) Schafer's method
13) Starting by a centrifugal or turbine pump must require
A) Priming
B) Opening of valve
C) Snoring
D) Reciprocating
E) Jigging
14) The full form of ERTL is:
A) Electronics report and test laboratory
B) Electronics review and test laboratory
C) Electrical research and test laboratory
D) Electronics research and test laboratory
E) None of the above
15) The rupturing capacity of circuit breakers expressed in:
A) kilo ampere(kA)
B) kilo volt ampere(kVA)
C) volt ampere(VA)
D) mega volt ampere (MVA)
E) mega ampere(MA)
16) The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by
A) None of these
B) Newton’s first law
C) Wein’s displacement law
D) Newton’s law of cooling
E) Kirchhoff’s law
17) The dielectric strength of air under normal conditions is around
A) 150 kv/cm
B) 100 kv/cm
C) 250 kv/cm
D) 30 kv/cm
E) 200 kv/cm
19) If two moving elements have surface contact in motion,such pair said to be
A) surface pair
B) lower pair
C) sliding pair
D) higher pair
E) rolling pair
20) The unit of eletric energy is
A) Volt-Ampere
B) kWhr
C) kVA
D) joule-second
E) Watt
21) Special types of idlers to absorb shock at loading points are called
A) Return idlers
B) None of the above
C) Impact idlers
D) Actuating idlers
E) Carrying idlers
22) A heat engine converts heat energy from fuel combustion or any other source into which type of work
A) pressure work
B) none of the above
C) dynamic work
D) Mechanical work
E) Electrical work
23) One kg of steam sample contains 0.8 kg dry steam. Its dryness fraction is
A) 0.5
B) 1
C) 0.8
D) 0.6
E) 0.2
24) Continuous miner operates at
A) 1100 V
B) 550 V
C) 3300 V
D) 6600 V
E) none of these
25) The principle of working of a transformer is:
A) mutual induction
B) static induction
C) Both (A) and (C)
D) self induction
E) dynamic induction
26) Transmitting signal should be provided for haulage roadway if length is more than (In Mtr)
A) 20
B) 40
C) 30
D) 10
E) 15
27) The volute pumps and vortex volute pumps are pumps with shaft
A) multistage, horizontal
B) none of the above
C) single stage, vertical
D) multistage, verical
E) single stage, horizontal
28) Pressure welding or plastic welding consists of
A) none of the above
B) resistance welding
C) Spot welding
D) all the above
E) thermit welding
29) In order to reduce hysteresis losses, the cores of electrical machines are generally made of:
A) cast iron
B) high carbon steel
C) silicon steel
D) tungsten steel
E) low carbon steel
30) Trough shape of the belt conveyor is made with the help of
A) Bottom roller set
B) Idler set
C) Snub pulley
D) Drive roller set
E) None of the above
31) The formula to find I when the values of V and R are known is:
A) I=VR
B) None of the above
C) V=I/R
D) I=R/V
E) I=V/R
32) Which of these is a type of reciprocating steam engine
A) compound
B) none
C) all of the above
D) unflow
E) simple
33) The pump discharge can not be measured by
A) Orifice meter
B) All of the above
C) Triangular Notch
D) Manometer
E) Rectangular Notch
34) Elastic limit is the point
A) where strain is not dependent on stress
B) up to which stress is proportional to strain
C) At which elongation takes place without application of additional load
D) Up to which if the load is removed, original volume and shapes are not regained
E) Up to which if the load is removed, original volume and shapes are regained
35) The lighting provided in a mine shall, as far as possible, be so arranged as to prevent
A) Over voltage
B) Glare
C) Over load
D) all of the above
E) None of the above
36) Telephonic communication should be provided U/G haulage roadway if length is more than ( In Mtr)
A) 100
B) 200
C) 250
D) 150
E) 300
37) Funtion of the pull cord in the belt conveyor system is
A) slowing device
B) scrapping device
C) stopping device
D) signalling device
E) Cleaning device
38) Which point on the stress strain curve occur after proportionality limit?
A) Upper yield point
B) Lower yield point
C) Torsion limit
D) Ultimate point
E) Elastic limit
39) A step-up transformer increase
A) voltage
B) power
C) resistance
D) current
E) frequency
41) The stress which acts in a direction perpendicular to the area is called
A) None of these
B) Bending stress
C) Normal stress
D) Thermal stress
E) shear stress
42) Lancashire boiler is of
A) all of the above
B) stationary fire tube type
C) natural circulation type
D) internally fired type
E) horizontal type
43) The meter used for measuring current of an electrical circuit is called
A) potentiometer
B) ammeter
C) Multimeter
D) voltmeter
E) ohm meter
44) Which feature is not found in Universal Drilling Machine
A) It can drill blast holes
B) None of the above
C) It is crawler mounted
D) All of the above
E) It can drill in any direction
45) Tractive force is dependent
A) none of these
B) both of these
C) wt of the track
D) on the wt of the m/c
E) on the weight of machine & also frictional adhesion between wheel and track
46) Examination of brakes of the winding engine should be done( In hours)
A) 16
B) 8
C) 20
D) 12
E) 24
47) Overman's certificate (restricted) reqd as per CMR, 2017, Regulation no.
A) 247(1)
B) 247(4)
C) 247(3)
D) 247 (5)
E) 247(2)
48) The main function of economiser of a boiler plant is to
A) increase life of boiler
B) increase steam pressure
C) increase steam production
D) all of the above
E) reduce fuel consumption
49) Which type of fire extinguisher must NOT be used for electrical base fire?
A) Foam extinguisher
B) Halon extinguisher
C) Dry powder extinguisher
D) None of the above
E) Carbon tetra chloride(CTC) extinguisher
50) The material used for bus-bars should have
A) high softening temperature
B) low cost
C) all of the above
D) low resistivity
E) high resistivity
51) Motor overheating is caused by which of the following faults?
A) all of the above
B) Shorted windings
C) Overloads
D) Worn or dry bearings
E) None of the above
52) Distribution transformers are designed to have maximum efficiency nearly
A) at full load
B) at no load
C) at 50% of F.L.
D) all of the above
E) None of the above
53) The water accumulated in the steam pipe line connected from the boiler to the windng engine can be removed by installing
A) L- Bend at the end of the pipe line
B) a pressure reducing valve
C) all the above
D) a flow meter
E) a U-type steam trap
54) The transformer oil used in transformers provide:
A) cooling only
B) insulation, cooling and lubrication
C) insulation and cooling
D) cooling and lubrication
E) insulation and lubrication
55) The equipment used to convert D.C. into A.C. is called:
A) a generator
B) a regulator
C) a converter
D) a rectifier
E) an inverter
56) When speed of an alternator is changed from 3600 R.P.M. to 1800 R.P.M., the generated e.m.f. per phase will become
A) twice
B) three times
C) one-fourth
D) one-half
E) four times
57) At the time of charging a lead acid battery which one of the harmful gas evolute?
A) Carbon dioxide
B) Hydrogen
C) Methane
D) Nitrogen
E) Oxygen
58) The automatic contrivances in winding engines are
A) over winding
B) None of the above
C) Any of (A) and (B)
D) both (A) and (B)
E) over speeding
59) The number of turns of the rope required on the drum when the cage or other means of conveyance is al its lowest working point in the shaft.
A) should be two
B) not required
C) at least 2
D) at least one
E) at least 3
60) What is the maximum permissible width of manholes provided in the haulage roadway?
A) 1.2 metre
B) 1.5 metre
C) 1.0metre
D) 0.8metre
E) 0.6metre
61) Galvanized winding ropes are not required to be used in
A) dry shafts
B) Both B & C
C) Both A & C
D) wet shafts
E) upcast shafts
62) The angle of fleet in terms of winding is the angle
A) none of these
B) zero degree
C) both of the above
D) between the vertical plane of the pulley and the rope when the cage is at pit top
E) between the rope of both the pulley when it is extended
63) Automatic contrivance is used in
A) direct haulage
B) Endless Haulage
C) all of these
D) Material winding
E) Man winding
64) Creep in a belt drive is due to
A) expansion of belt
B) larger size of the driver pulley
C) uneven extensions and contractions due to varying tension
D) material of the pulley
E) material of the belt
65) Plans, sections and records reqd as per CMR, 2017, Regulation no.
A) 257
B) 255
C) 256
D) 253
E) 254
66) Melting point of white metal used for re-capping of mine winder ropes is
A) 600°C
B) 270°C
C) 400°C
D) 150°C
E) 365°C
67) Location of surge tank in an hydro electric power station,is near
A) penstock
B) tail race
C) reservoir
D) turbine
E) Dam
68) The powerfactor of an open ended cable can be improved by
A) none
B) increasing the capacitance
C) increasing the conductor resistance
D) increasing the inssulation resistance
E) decreasing the capacitance
69) Use of self-rescuer reqd as per CMR, 2017, Regulation no
A) 242
B) 241
C) 244
D) 243
E) 240
70) The condition of electrolyte in a battery is measured in terms of:
A) current value
B) acid contents
C) None of the above
D) specific gravity
E) voltage output
71) Service Control Valve in the SDL machine is used for
A) Both A & C
B) Moving the machine forward or backward
C) Moving the machine left or right
D) Both A & B
E) Lifting & tilting of the bucket
72) If a person studies about a fluid which is at rest, what will you call his domain of study?
A) Fluid Kinematics
B) Fluid Dynamics
C) None of these
D) Fluid Mechanics
E) Fluid Statics
73) Short circuit protection is provided in the circuit breaker by:
A) None of the above
B) Magnetic release
C) Low voltage release
D) magnetic and thermal release
E) Thermal release
74) Cleaned & free from loose material of floor of cage, required as per CMR2017, regulation no.
A) 83 (2)
B) 83 (1)
C) 83 (3)
D) 83(5)
E) 83(4)
75) The track chain in a track mounted machine moves over
A) sprockets at both ends
B) sprocket and idler at the ends
C) Rollers at both ends
D) Idler and roller at the ends
E) Idler at both ends
76) The type of gear used for speed reduction of 50:1 will be
A) bevel
B) worm wheel
C) spur
D) herringbone
E) hypoid
77) Dozers can be classified as
A) All of them
B) Both A & B
C) Crawler mounted dozers
D) Wheel mounted dozers
E) Dozer with cable operated blade
78) A dragline is specified by
A) Supplying voltage
B) Both A & B
C) Power of the machine
D) Boom length only
E) Bucket capacity only
80) Head developed by the pump depends on
A) power of the pump
B) all of the above
C) Speed of the impeller
D) desgin of the impellor
E) desgin of the casing
81) Flame trap is used with
A) Endless haulage
B) Diesel locomotive
C) Pump
D) Belt conveyor
E) Direct haulage
82) Slip ring induction motor is mainly used with
A) Main & tail rope haulage
B) Belt Conveyor
C) Chain Conveyor
D) Endless haulage
E) Tail rope haulage
83) An automatic indicator shall be provided at the pit top to see easily by the banksmen to show that
A) automatic contrivance was fully engaged
B) the position of the keps
C) no of persons riding in the cage
D) both A & B
E) depth of the shaft
84) Any obscure physical change in rope due to repeated stress is
A) wear
B) deformation
C) corrosion
D) fatigue
E) none of these
85) PVC stans for:
A) Penta vinyl chloride
B) Positive Voltage conductor
C) Pressed and varnised cloth
D) Post varnish conductor
E) Poly vinyl chloride
86) A method of cooling a power transformer is -
A) Forced air cooling
B) Oil cooling
C) All of the above
D) Natural air cooling
E) none of these
87) The steel used in the excavator bucket teeth
A) Medium carbon steel
B) High speed steel
C) Manganese steel
D) Stainless steel
E) Nickel steel alloy
88) At the time of starting, the slip of an induction-motor is equal to:
A) zero
B) infinite
C) none of these
D) unity
E) two
89) After what depth of sinking shaft it is mandatory to provide detaching hook in the bucket or other means of conveyance.
A) 45 metre
B) 60 metre
C) 50 metre
D) 40 metre
E) 55 metre
90) The magnetic field produced in the stator of a three phase induction motor travels at ……………….
A) synchronous speed
B) asynchronous speed
C) None of the above
D) slip speed
E) rotating speed
91) The dynamic viscosity of a fluid is 1 Poise. What should one multiply to it to get the answer in N-s/m2?
A) 100
B) 10
C) 1000
D) 0.1
E) 1
92) The coal of the lowest calorific value is
A) steam coal
B) all of the above
C) anthracite
D) bituminous
E) lignite
93) Which of the following statement is true?
A) Casting and the pattern are same things
B) All are true
C) Casting is the replica of the object to be cast
D) Pattern is the replica of the casting object
E) Molten material is casted into the casting cavity
94) The maximum temperature in the I.C.engine cylinder is of order of
A) 1500-2000° C
B) 2500-3000° C
C) 1000-1500° C
D) 500-1000° C
E) 2000-2500° C
95) On a curve this force creates a tendency for the train to leave the track causing excessive wear on wheels
A) gravitational
B) dynamic
C) centrifugal
D) frictional
E) centripetal
96) The property by which a body returns to its original shape after removal of the force, is called
A) Tenacity
B) Elasticity
C) Malleability
D) Ductility
E) Plasticity
97) Sequence Control is used in which transporation system?
A) Train of tubs
B) Rope haulage
C) Belt Conveyor
D) Aerial ropeway
E) Winding
98) An apparatus which is operated in a fixed position but which is so designed as to be capable of being moved readily from one place to another is called
A) None of the above
B) switchgear
C) portable hand lamp
D) Portable apparatus
E) transportable apparatus
99) The number of persons allowed to ride in same cage are decided by manager as per formula
A) 0.30 square metre of floor area per person
B) 0.20 square metre of floor area per person
C) 0.10 square metre of floor area per person
D) 0.25 square metre of floor area per person
E) 0.15 square metre of floor area per person
100) Max Ladder inclination in shaft should be (In degree)
A) 30
B) 50
C) 40
D) 80
E) 60
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