FMR-MINING MACHINERY DGMS EXAM 2021
Question Paper & Key of DGMS FIRST CLASS RESTRICTED UNDER MMR – MINING MACHINERY EXAM-2021
No. of Questions: 100
Duration in Minutes: 120
1) The surface tension of mercury at normal temperature is that of water
A) it varies
B) none
C) higher than
D) same as
E) lower than
2) Lifting operation by using two or more Lifting Appliances called
A) Tandem Lift
B) Complex Lift
C) Heavy Lift
D) none of these
E) Careful Lift
3) The Cippoletti weir is a weir
A) trapezoidal
B) triangular
C) circular
D) none
E) rectangular
4) The direction of rotation of a D.C. series motor can be changed by
A) interchanging supply terminals
B) None of these
C) either of (a) and (b) above
D) interchanging poles
E) interchanging field terminals
5) The number of exhuast manifolds in a V-8 engine
A) One
B) Two
C) Four valves
D) There is no exhaust manifold
E) Eight
6) the space between detaching hook of cage suspension gear and detaching bell or plate at head gear structure, when the cage is resting at pit top; shall not be less than metres when a direct acting engine is used.
A) 5 metres
B) 3.6 metres
C) 12 metres
D) 10 metres
E) 7.5 metres
7) What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
A) The armature may burn
B) The motor will continue to run
C) The motor will stop
D) The motor will run noisy
E) None of these
8) Which of the following motors is used in mixies
A) Reluctance motor
B) Repulsion motor
C) Schrage motor
D) Universal motor
E) Hysteresis motor
9) The velocity ratio for the first system of pulleys is (n is number of pulleys)
A) 2n
B) n2
C) N
D) 2n – 1
E) None
10) What would be the RPM of accelerating the engine for maintaining it for few seconds during testing of dump/parking rake –
A) none of these
B) 1400 RPM
C) 1000 RPM
D) 1200 RPM
E) 2000 RPM
11) What is tentative piloting pressure in a 60 T hydraulic excavator
A) 150 - 200 bars
B) > 100 bars
C) 75 - 80 bar.
D) 35 - 40 bar.
E) 60 - 70 bar.
12) A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
A) none
B) turbulent flow
C) steady flow
D) streamline flow
E) uniform flow
13) The point, through which the whole weight of the body acts, irrespective of its position, is known as
A) none of these
B) centre of gravity
C) centre of mass
D) moment of inertia
E) centre of percussion
14) The velocity of a particle moving with simple harmonic motion is_____ at the mean position
A) Zero
B) Half
C) minimum
D) maximum
E) None
15) Capacitors for power factor correction are rated in
A) KVAR
B) kVA
C) kW
D) KA
E) kV
16) When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
A) pi
B) pi / 2
C) none
D) zero
E) one
17) All the rules and laws of D.C. circuit also apply to A.C. circuit containing
A) none of the above
B) capacitance and inductance only
C) resistance only
D) inductance only
E) capacitance only
18) What is the use of cabin guard extension
A) To cover the operator cabin
B) To cover tyres
C) To cover rear axle
D) To cover diesel tank
E) none of these
19) When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as
A) screw pair
B) turning pair
C) sliding pair
D) spherical pair
E) none
20) Blanking and piercing operations can be performed simultaneously in a
A) simple die
B) progressive die
C) none
D) compound die
E) combination die
21) How much time is required to hold the fully loaded dumper at the max gradient of road way vehicle –
A) none of these
B) 10 min
C) 30 min
D) 5 min
E) 45 min
22) In a three-phase induction motor, the number of poles in the rotor winding is always
A) equal to number of poles in stator
B) zero
C) None of these
D) less than number of poles in stator
E) more than the number of poles in stator
23) 0ne kg force is equal to
A) 7.8 N
B) 10 N
C) 9.8 N
D) 12 N
E) 8.9 N
24) The ratio of active power to apparent power is known as factor.
A) Load
B) Capacity
C) Power
D) Form
E) demand
25) If the shaft exceeds_____ metres in depth, there shall be a clear over run space of not less than 7.5 metres below the lowest landing place.
A) 300 metres
B) 400 metres
C) 100 metres
D) 500 metres
E) 200 metres
26) A kinematic chain is known as a mechanism when
A) none
B) all
C) two of the links is fixed
D) one of the links is fixed
E) none of the links is fixed
27) which of the following is an open pair
A) cam and follower
B) journal bearing
C) ball and socket joint
D) none
E) lead screw and nut
28) If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
A) g / 4
B) g / 5
C) none
D) g / 3
E) g / 2
29) Why an air vessel is used in a reciprocating pump
A) to increase delivery head
B) to obtain continuous supply of water at uniform rate
C) to reduce suction head
D) to reduce delivery head
E) to reduce cavitation
30) Auto dipping system installed on dumper operates
A) during loading operation
B) during tipping operation
C) when approaching another dumper during cross over
D) safety device
E) providing alarm during emergency
31) Which of the following conveyor system has greatest ability to curve horizontally as well as vertically?
A) Pipe conveyor
B) Snake conveyor
C) Pocket lift conveyor
D) Sandwich conveyor
E) Flexo well conveyor
32) A diesel engine is usually more efficient than a spark ignition engine because
A) none of these
B) the efficiency of a diesel cycle is higher than Otto cycle
C) compression ratio of a diesel engine is less than SI engine
D) the compression ratio of a diesel engine is higher than SI engine
E) diesel releases more heat/kg than gasolene
33) Main constituents of brass is
A) tin,zinc
B) lead,zinc
C) copper,tin
D) copper,lead
E) copper,zinc
34) No winding rope shall be used if its factor of safety is or becomes less than in the case of a shaft exceeding 700 metres in depth but not exceeding 1000 metres.
A) 9
B) 7
C) 10
D) 8
E) 6
35) Supercharger is a
A) Device is attached to drill compressors for increasing the compressed air pressure
B) Device which is used to fill nitrogen in the tyres at a high pressure
C) Device which increases the pressure of the air-fuel mixture from the carburetor before it enters the engine
D) Device is attached to drill compressors for increasing the compressed air volumes
E) none of these
36) A balanced 3-phase system consists of
A) zero sequence currents only
B) positive sequence currents only
C) negative and zero sequence currents
D) zero, negative and positive sequence currents
E) None of these
37) When a pattern is made in three parts, the_____ is known as a drag
A) none
B) middle part
C) bottom part
D) top part
E) all of these
38) Which is the correct formula for per hour production calculation of scraper?
A) Load capacity / Number of trips per hour
B) Working minutes per hour x Cycle time in minutes
C) Load capacity x number of trips per hour
D) Working minutes per hour / Cycle time in minutes
E) Number of trips per hour / Load capacity
39) If any two phases for a polyphase induction motor are interchanged
A) the motor will run in reverse direction
B) the motor will attain high speed
C) the motor will run at reduced speed
D) the motor will burn
E) the motor will not run
40) Tail gate protection is provided in which opencast mining machineries
A) dragline
B) surface miner
C) dozer
D) shovel
E) dumper
41) Above the top most landing, the device for holding the cage in the event of overwind in vertical shaft is
A) Keps
B) Mouse
C) none
D) Dog
E) Cat
42) coefficient of friction depend upon
A) None
B) area of contact only
C) Both
D) Load
E) nature of surface only
43) Slip ring induction motor has
A) Zero starting torque
B) Medium starting torque
C) High starting torque
D) Low starting torque
E) None of these
44) By which of the following methods string efficiency can be improved
A) Using a guard ring
B) Using long cross arm
C) None of the these
D) Grading the insulator
E) Any of the these
45) In a automobile engine the temperature of the piston will be more at
A) The skirt of the piston
B) The crown of the piston
C) The piston ring
D) The piston pin
E) The piston walls
46) Filters in hydraulic circuit are rated in
A) millimeters
B) centimeters
C) none
D) all
E) microns
47) No winding rope shall be used if its factor of safety is or becomes less than ------ in the case of a shaft not exceeding 300 metres in depth.
A) 7
B) 10
C) 6
D) 9
E) 8
48) The transformer ratings are usually expressed in terms of
A) Volts
B) KVA
C) KW
D) Amperes
E) KVAR
49) Pressure on a confined fluid is transmitted undiminished in every direction and acts with equal forces on equal areas and at right angles to the container walls; was stated by
A) Bernoulli's principle
B) Newtons second law
C) Newtons first law
D) none
E) Pascal's law
50) The liquid used in manometers should have
A) low surface tension
B) high surface tension
C) none
D) low density
E) high density
51) A steel bar of 5 mm is heated from 15o C to 40o C and it is free to expand. The bar will induce
A) none
B) compressive stress
C) shear stress
D) tensile stress
E) no stress
52) For test run of HEMM ,Every mechanic is required to posses –
A) Driver/Operator license
B) 10 yrs exp as driver
C) Degree in Mechanical Engg
D) Degree in mining engg.
E) None of these
53) The property of sand due to which the sand grains stick together, is called
A) cohesiveness
B) none
C) collapsibility
D) permeability
E) adhesiveness
54) The bending moment at the free end of a cantilever beam is
A) maximum
B) minimum
C) none
D) zero
E) intermittent
55) The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (t thickness of the plate)
A) 8t
B) 2t
C) 4t
D) t
E) none
56) The power factor of a single-phase induction motor is usually
A) None of these
B) always leading
C) unity
D) unity to 0.8 leading
E) lagging
57) In an engine the probable cause for low oil pressure cannot be from
A) Excessive clearance at valve pushers
B) Water,sludge,dirt etc restricting oil pump intake screen
C) Air leaks in oil pump suction line
D) Use of heavy engine oil
E) Use of different engine oil
58) Cast iron and steel pipes are produced by
A) slush casting
B) investment casting
C) die casting
D) none
E) true centrifugal casting
59) During the charging of a lead-acid cell
A) it gives out energy
B) its cathode becomes dark chocolate brown in colour
C) its voltage increases
D) None of the above
E) specific gravity of H2SO4 decreases
60) When a pattern is made in three parts, the top part, is known as
A) cope
B) cheek
C) all of these
D) drag
E) none
61) The draft or taper allowance on casting is generally
A) 10 to 15 mm/m
B) 5 to 10 mm/m
C) 2 to 5 mm/m
D) none
E) 1 to 2 mm/m
62) A moving mandrel is used in
A) wire drawing
B) metal cutting
C) none
D) tube drawing
E) forging
63) The velocity of a body on reaching the ground from a height h, is
A) √2gh
B) None
C) 2g x √ h
D) √ gh
E) 2 x √gh
64) Frequency of vibrations is usually expressed in
A) number of cycles per second
B) all of these
C) none
D) number of cycles per hour
E) number of cycles per minute
65) The unit of angular acceleration is
A) None
B) m / s2
C) m / sec
D) N m
E) rad / sec2
66) A smooth cylinder lying on its convex surface remains in equilibrium
A) stable
B) none
C) neutral
D) oscillating
E) unstable
67) The maximum acceleration of a particle moving with simple harmonics motion is (w is angular velocity)
A) w x r
B) w / r
C) w2 x r
D) None
E) W
68) It is advisable to avoid line-starting of induction motor and use starter because
A) None of these
B) it will pick-up very high speed and may go out of step
C) motor takes five to seven times its full load current
D) it will run in reverse direction
E) starting torque is very high
69) The shrinkage allowance for cast iron pattern is
A) 10 mm/m
B) 20 mm/m
C) 26 mm/m
D) none
E) 16 mm/m
70) when the body is suspended at the point of suspension, its periodic time and frequency will be as compared to the body suspended at the point of percussion
A) same
B) two times
C) none
D) four times
E) eight times
71) In order to double the period of simple pendulum, the length of string should be
A) no change
B) quadrupled
C) doubled
D) halved
E) none
72) Safe working load limit of 1” (one inch) wire rope sling
A) 6 Ton
B) 10 Ton
C) 8 Ton
D) none of these
E) 5 Ton
73) In case of a double cage induction motor, the inner cage has
A) low inductance and high resistance
B) high inductance and high resistance
C) low inductance and low resistance
D) high inductance and low resistance
E) None of these
74) A wire rope round strand with wire core has a diameter of 25mm.find out the mass of rope (in kg) for 10m length, where rope design factor is 0.4
A) 35
B) 45
C) 15
D) 25
E) 32
75) When a point moves along a straight line, its acceleration will have
A) radial component only
B) tangential component only
C) coriolis component only
D) none
E) radial and tangential components both
76) The force of buoyancy is always --- the weight of the liquid displaced by the body
A) depends on other parameters
B) none
C) equal to
D) more than
E) less than
77) Connecting rod is attached to the piston by the
A) Rod cap
B) Lower cap
C) Piston pin
D) Cap bolt
E) Cap roller bearing
78) The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
A) tangential component
B) radial component
C) coriolis component
D) all of these
E) none
79) A flow through an expanding tube at constant rate is called
A) unsteady uniform flow
B) unsteady non uniform flow
C) steady non uniform flow
D) none
E) steady uniform flow
80) Passing the exhaust gasses through the dump body mainly helps in
A) Improves the crushability of the material
B) reduced dust emmission while dumping
C) keeping dump body non sticky
D) drying the material before crushing
E) None of these
81) The motion of a wheel of a car is
A) combined translational and rotational
B) purely translation
C) none
D) rectilinear
E) purely rotational
82) which of the following is an inversion of a single slider crank chain
A) rotary internal combustion engine
B) none
C) oscillating cylinder engine
D) all of these
E) pendulam pump
83) A taper provided on the pattern for its easy and clean withdrawl from the mould is known as
A) none
B) machining allowance
C) draft allowance
D) shrinkage allowance
E) distortion allowance
84) Impurities are generally added in the pure semiconductor to
A) increase their resistivity
B) increase the number of electrons
C) increase their conductivity
D) increase the number of holes
E) all of these
85) In blanking operation, the clearance is provided on
A) half on the punch and half on the die
B) none
C) punch
D) die
E) either on die or punch depending on designer
86) An ideal machine is one whose efficiency is in between
A) 60 and 70 %
B) 70 and 80 %
C) None
D) 1
E) 80 and 90 %
87) what portion of automatic contrivance starts when cage is at a distance of not less than twice the circumference of the drum.
A) none
B) all of above
C) over winding
D) slow banking
E) overspeed,
88) In HEMM; intermediate fill factor is obtained in
A) dragline
B) all of the above
C) bucket wheel excavator
D) shovels
E) dumpers
89) The unit of force in S.I. System of units is
A) Newton
B) Kilogram
C) dyne
D) None
E) Watt
90) Which of the following law/rule can be used to determine the direction of rotation of D.C. motor
A) Faraday’s law
B) None of these
C) Fleming’s left-hand rule
D) Lenz’s law
E) Coloumb’s law
91) The rate of change of displacemet of a body is called
A) acceleration
B) velocity
C) none
D) momentum
E) force
92) The speed of a D.C. shunt motor can be increased by
A) reducing the resistance in the armature circuit
B) increasing the resistance in field circuit
C) reducing the resistance in the field circuit
D) none of the above
E) increasing the resistance in armature circuit
93) The motion of a particle round a fixed axis is
A) translatory
B) None
C) translatory as well as rotary
D) Rotary
E) circular
94) Hook's law holds good up to
A) breaking point
B) none
C) plastic limit
D) elastic limit
E) yield point
95) The coriolis component of acceleration acts
A) at 45o to the sliding surface
B) along the sliding surface
C) perpendicular to the sliding surface
D) parallel to the sliding surface
E) none
96) The top of the weir over which the water flows is known as
A) nappe or vein
B) all of these
C) sill or crest
D) orifice
E) none
97) The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
A) 2
B) 0
C) 1
D) none
E) -1
98) The coriolis component of acceleration leads the sliding velocity by
A) 90o
B) 135o
C) 45o
D) none
E) 180o
99) What is approximate hydraulic oil temperature in circuit of 40 to 80 Ton class Excavator during operation
A) 55 to 60 degree centigrade
B) above 100 degree centigrade
C) 85 to 95 degree centigrade
D) 65 to 75 degree centigrade
E) 75 to 85 degree centigrade
100) The ratio of change in volume to the original volume is called
A) volumetric strain
B) none
C) lateral strain
D) linear strain
E) Poisson's ratio
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