| Post Name | Mechanical Engineer - Kerala State Water Transport |
|---|---|
| Question Paper Code | 076/2024/OL |
| Category Code | 437/2022 |
| Date of Test | 28 June 2024 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
The centre of gravity of the volume of the liquid displaced is called
Answer
C. centre of buoyancy
2
The liquid used in manometers should have
Answer
B. high density
3
When is a fluid called turbulent ?
Answer
C. Reynolds number is greater than 2000
4
The compressible flow is assumed to be
Answer
C. isentropic only
5
Which among the following is an assumption of Hagen-Poiseuille equation ?
Answer
D. Fluid is laminar
6
Which of the following is not a correct statement ?
Answer
C. Circulation per unit area equals the vorticity in flow.
7
In IC engine, the throttle controls
Answer
C. quantity of charge
8
The diesel injection pump is usually driven by a
Answer
B. gear driven from the engine crank shaft
9
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the % age increase in efficiency will be
Answer
D. 14%
10
What is the firing order of a six stroke I.C. engine ?
Answer
C. 1-5-3-4-2-6
11
In MPFI-Electronic Control System, the ________ sensor sends information about the engine speed.
Answer
C. ignition
12
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
Answer
B. Supercharging
13
A rod, 120 cm long and of diameter 3.0 cm is subjected to an axial pull of 18 kN. The stress in N/ is
Answer
B. 25.47
14
The length of a wire is increased by 1 mm on the application of a certain load. In a wire of the same material but of twice the length and half the radius, the same force will produce an elongation of
Answer
A. 8 mm
15
Maximum shear stress in a hollow shaft subjected to a torsional moment is at the
Answer
D. at the outer surface of the shaft
16
The ratio of lateral strain to linear strain is called
Answer
B. Poisson's ratio
17
With an increase in the thickness of insulation around a circular pipe, heat loss to surroundings due to
Answer
B. convection increases while that due to conduction decreases
18
Which one of the following forms of water has the highest value of thermal conductivity ?
Answer
D. Solid ice
19
On a heat transfer surface, fins are provided to
Answer
B. surface area is maximum to promote the rate of heat transfer
20
Metals are good conductors of heat because
Answer
A. they contain free electrons
21
The time constant of a thermocouple is
Answer
D. the time taken to attain 63.2% of the value of initial temperature difference
22
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
Answer
A. magnification factor
23
The equation of motion for a vibrating system with viscous damping is d²x/dt² + (C/m)(dx/dt) + (S/m)x = 0. If its roots are real, the system will be
Answer
C. over damped
24
For an underdamped harmonic oscillator, resonance
Answer
B. occurs when excitation frequency is equal to the undamped natural frequency
25
In steady state forced vibrations, the amplitude of vibrations at resonance is _____ damping coefficient.
Answer
D. inversely proportional to
26
As per regulation 15 of Annex I of MARPOL, what is the maximum amount of oil content of the effluent without dilution that can be discharged into the sea ?
Answer
B. 15 parts per million
27
Which of the following statements are true with respect to the relief valve fitted on the hydraulic system of steering gear ? i) A relief valve need not be fitted if the system is pressure tested ii) The setting of the relief valves shall not exceed the design pressure iii) The size of the valves must be so as to avoid an undue rise in pressure above design pressure iv) The setting of the relief valves shall not exceed 1.5 times the design pressure
Answer
C. Only (ii and iii)
28
What is the validity period of an International Air Pollution Prevention Certificate issued to a ship ?
Answer
A. 5 years
29
Which among the below Codes/Conventions deals with hours of work and hours of rest of seafarers onboard a ship ?
Answer
B. MLC 2006
30
As per ISM Code, who is responsible to establish procedures to identify, describe and respond to potential emergency shipboard situations ?
Answer
C. Company
31
Which among the below is the lubricating oil additive that neutralizes acidity formed in the oil?
Answer
C. Corrosion Inhibitor
32
The energy absorber unit provided on vibratory systems to offer resistance to oscillations is known as
Answer
D. Damper
33
Which among the below statements is not true with regard to emergency bilge pump ?
Answer
B. It is a multi-stage gear pump
34
In a centrifugal pump with the ring of guide passages around the impeller, the kinetic energy of the liquid is converted into pressure energy by
Answer
B. Diffuser Passage
35
Which among the below are the functions of a viscotherm installed in a fuel oil system onboard a ship ? i) Measure the viscosity of fuel oil ii) Cut-off fuel supply to stop the engine iii) Provide a signal to control the heating of fuel oil iv) Bypass the fuel oil into a homogenizer
Answer
B. Only ( i and iii)
36
Which among the below is not a reason for higher maximum pressure of ignition in a diesel engine ?
Answer
D. Late injection
37
Which among the below are the functions of volute casing of a centrifugal pump ? i) It converts velocity energy into pressure energy ii) It converts pressure energy into velocity energy iii) It accommodates the gradual increase in quantity of fluid that builds at discharge from the circumference of the impeller iv) It increase the velocity of flow
Answer
A. Only (i and iii)
38
Which among the following statements is not true with respect to a fixed pitch propeller fitted to the tail shaft with a key and taper ?
Answer
C. The fitting relies entirely on a good interference fit
39
Which among the below are the functions of a thrust block ? i) It transfers forward or astern propeller thrust to the hull ii) It dampens vibration of the hull iii) It limits axial movement of the shaft
Answer
C. Only (i and iii)
40
Which among the following statements are correct with regard to propeller shafting with reduction gears ? i) The arrangement permits engines and propellers to run at their best speeds ii) The arrangement requires higher starting air capacity as compared to directly coupled propeller arrangement iii) The arrangement permits use of more than one engine to be coupled to the same propeller
Answer
A. Only (i and iii)
41
A ________ is fitted along the bilge radius either side of the ship to damp any tendency the ship has to roll.
Answer
C. Bilge Keel
42
The tonnage value obtained by deducting the total value of the 'deducted spaces' from the gross tonnage is called
Answer
B. Net tonnage
43
Which among the below is the purpose of a clench pin ?
Answer
D. Pin used to secure the final link of the anchor cable to the ship's structure
44
The uppermost continuous deck exposed to the weather and the seas which has permanent means for the watertight closure of all exposed openings on the deck and in the side shell below is called
Answer
B. Freeboard deck
45
Which among the below is the reason for keeping troughs on corrugated longitudinal watertight bulkheads in horizontal direction ?
Answer
D. To add to the longitudinal strength of the ship
46
As per the Fire Safety Systems Code, what must be the capacity of self-contained breathing apparatus used as part of fire fighter's outfit ?
Answer
C. Capable of functioning for at least 30 mins
47
With respect to fire detectors used in fixed fire detection and fire alarm systems onboard, which among the following statements are true ? i) Flame detectors shall only be used in addition to smoke or heat detectors ii) Smoke detectors shall only be used in addition to flame or heat detectors iii) Smoke detectors within accommodation spaces shall be certified to operate in the range of 2 to 12.5% obscuration per metre iv) Heat detectors shall only be used in addition to flame or smoke detectors
Answer
C. Only (i and iii)
48
Which among the given options is not recorded by a Voyage Data Recorder ?
Answer
D. Engine room conversation
49
Which among the below statements are true with respect to a hydrostatic release unit (HRU) used in the float-free arrangements ? i) HRU must automatically release the life raft at a depth of not more than 8 m ii) HRU must be permanently marked on its exterior with its type and serial number iii) HRU must automatically release the life raft at a depth of not more than 4 m iv) HRU must be permanently marked on its exterior with the ship's name
Answer
B. Only (ii and iii)
50
What is the requirement regarding capability of lifeboat launching appliance as per LSA Code ?
Answer
C. The launching appliance shall be capable of recovering the lifeboat with 100% of its crew
51
The air standard Otto cycle includes
Answer
A. two constant volume processes and two constant entropy processes
52
Thermal efficiency of a theoretical Otto cycle
Answer
D. all the above
53
The lowest temperature at which a substance starts to burn is known as
Answer
D. Ignition Temperature
54
What is the importance of caloric value ?
Answer
B. assists in determining which fuel is good
55
The stoichiometric air-fuel ratio for petrol is about
Answer
C. 15:1
56
The loads sustained by a vehicle frame are
Answer
D. All the above
57
Which of the following is not a part of an automobile chassis ?
Answer
D. Differential
58
The transmission system of a vehicle transfers _____ from the engine to the wheels.
Answer
C. Power
59
Which of the following is not a component of automatic transmission ?
Answer
C. Sliding mesh gearbox
60
Which type of manual gearbox uses double declutching ?
Answer
B. Constant mesh gearbox
61
An automotive chassis does not include which of the following elements ?
Answer
A. Differential
62
The vehicle system's unsprung mass consists mainly of
Answer
B. Axle and Parts attached to it
63
Which of the following systems is used to control a vehicle ?
Answer
B. Brakes and steering system
64
The primary benefit of employing aluminium alloy for the cylinder head is
Answer
A. high thermal conductivity
65
A square-type engine is one that
Answer
B. has cylinder bore length equal to stroke length
66
What is the purpose of an oil ring in an engine ?
Answer
C. Lubricate the cylinder walls
67
A four-cylinder engine has a capacity of 2.4 litre. The swept volume of a single cylinder is
Answer
C. 600 cubic centimeters
68
What is the connecting rod's material ?
Answer
D. Forged Steel
69
What are the key factors that influence gear selection ?
Answer
C. Vehicle speed and engine load
70
The front wheel alignment is adjusted by changing the
Answer
A. Length of Track Arm
71
How do you fix noise in hydraulic steering ?
Answer
D. Fill fluid to correct level and bleed the system
72
What happens in the floating chamber while the fuel pump idles ?
Answer
A. It remains filled
73
What is the reason for the low voltage output from the alternator ?
Answer
C. Faulty regulator
74
The device used for measuring the clearance between the valve and tappet of an internal combustion engine is
Answer
B. Feeler gauge
75
Dry sump is not desirable in the small vehicle due to
Answer
D. all the above
76
A floating buoy in the form of a vertical cylinder with diameter, "d" and height "h". The density of the material of the buoy is "pb". If the density of seawater is "ps". The distance form centre of buoyancy to centre of gravity is
Answer
B. (h/2)[1−ρb/ρs]
77
According to the International Maritime Organization (IMO), International Code on Intact Stability, the initial transverse metacentric height should not be less than ________ meters.
Answer
D. 0.15
78
What does the angle of vanishing stability on the stability curve for ships represent ?
Answer
B. The angle of heel at which the sign of righting lever changes from positive to negative
79
Which of the following statements accurately describes parametric rolling in ship dynamics ?
Answer
B. It occurs when a ship's natural roll frequency synchronizes with the frequency of waves encountered
80
The block coefficient "C_B" prismatic coefficient, "C_P" and mid-ship coefficient "C_M" are related as
Answer
A. C_B=C_P×C_M
81
What is the main reason for the residuary resistance curve exhibiting a series of 'humps' and 'hollows' ?
Answer
B. The wave resistance oscillates about a mean curve depending on whether the interference effects from the bow and stern systems resulting in maximum or minimum resistance
82
A ship 100 meters length has a speed of 12 knots. The corresponding speed for a model vessel of 9 meters is __________ knots.
Answer
D. 3.6
83
Propulsive efficiency is the product of ________ and shaft transmission efficiency.
Answer
C. Quasi propulsive coefficient
84
Which of the following are the requirements of similitude for cavitating propellers ? i) Same speed of advance ii) Same Reynolds number iii) Same slip iv) Same cavitation number
Answer
C. All options (i) to (iv) are correct
85
The propeller boss diameter of a controllable pitch propeller in comparison to a fixed pitch propeller will be
Answer
B. higher
86
Restoring effect applies to degrees of freedom of a ship in
Answer
D. Vertical plane
87
A ship has the following principal particulars: length between perpendiculars L m, beam B m, draft T m, area of water plane A_WP m², block coefficient C_B, and water plane coefficient C_WP. Assuming C_B is same as C_WP, added mass in heave can be taken 80% of body mass and if g is the acceleration due to gravity, the natural time period of oscillation of the vessel in heave motion is
Answer
C. 6π√(T/5g)
88
In a beam sea, the following relationship exists between the frequency of encounter "ωₑ" and wave frequency "ωw"
Answer
C. ωₑ=ωw
89
Acceleration dependent hydrodynamic derivatives of a surface ship are obtained from which of the below captive model tests.
Answer
A. Planar motion mechanism tests
90
The tactical diameter in turning manoeuvre is sallow water is ______ to that in deep water.
Answer
B. larger
91
Which of the following hull design features can help reduce the frequency and intensity of bow slamming in a high-speed vessel ?
Answer
C. Fine entry bow with moderate flare
92
Which type of anchor is characterized by a lower holding-power-to- weight ratio but is favoured in large ships due to ease of handling and stowage ?
Answer
C. Stockless anchors
93
In terms of ship safety, what is the main advantage of free-fall type lifeboats compared to davit type lifeboats ?
Answer
B. They can be launched even if the ship has a heavy inclination
94
The weight of liquids in pipes of the ship will be considered as
Answer
A. A part of light ship weight
95
MARPOL, (Annex-I, Regulation 12 A) impacts the design of oil tankers by requiring certain protective measures. Which of the following is a direct consequence of this regulation on tanker design ?
Answer
C. Specific requirements for the protection and positioning of fuel oil tanks
96
Deck beams on a ship are generally spaced at equal intervals and run
Answer
A. transversely
97
For LNG carrier construction which of the following Aluminium alloys are preferred ?
Answer
B. Aluminium-Magnesium
98
The purpose of using longitudinal water tight bulkheads in the cargo hold of oil tankers is
Answer
D. Reduce sloshing due to free-surface effects
99
Which of the following is "not true" about "A" brackets ?
Answer
A. Provides lateral support to rudder enhancing manoeuvrability
100
Which of the following statements regarding Gas Metal Arc Welding (GMAW) is "true" ?
Answer
D. It offers continuous electrode feeding, resulting in reduced starts and stops during welding
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