In this article, we are sharing the Official BHEL Executive/Engineer Trainee (BHEL ET) 2019 QUESTION PAPER By Bharat Heavy Electrical Limited. BHEL ET 2019 exam is successfully conducted on 25th May 2019 and 26th May 2019.
Download below the pdf of BHEL ET Mechanical Paper with solutions:
BHEL Exam Pattern for Engineer Trainee:
This is an online written test having 240 Objective Type questions of 1 mark each.
Oil India Senior Officer Previous Papers for Mechanical Engineering PDF Download: aspirants who are searching for Oil India Limited Previous Question Papers with solutions can find below.
Oil India Recruitment 2020: Oil India Limited has released a notification for recruitment to the post of Superintending Engineer (Drilling), Manager (Accounts)/Manager (Internal Audit), Senior Officer, Physiotherapist, Confidential Secretary, and others in Grade C, Grade B, and Grade A respectively. Interested and eligible candidates can apply at the official website https://www.oil-india.com/Current_openNew.aspxto the aforesaid posts on or before 30 October 2020.
Post Name - Senior Officer (Mechanical), (ME14)
Number of posts: 18 (UR -04, OBC -07, SC -04, ST -01, EWS -02)
Grade & Scale of Pay: B, Rs. 60000-180000
Required Educational Qualification: Bachelor’s Degree in Mechanical Engineering of minimum 04 years duration with minimum 65% marks
Selection Procedure:
> Candidates who qualify in the Computer Based Test (CBT) will be called in a ratio of 1:5 for the GD & PI based on marks in the Computer Based Test (CBT).
Important Dates:
Registration and submission of Form Online : 10:00 hours on 01st Oct 2020 Apply Here
Last Date of Submission of Form Online : 23:59 hours on 30th Oct 2020
SOLUTION OF THE WRITTEN TEST BY ISRO FOR SCIENTIST/ENGINEER 'SC' (REFRIGERATION & AIRCONDITIONING)[BE006 & BE010] -2014
21. Two crossed helical gears are used for speed reduction. Gear A has pitch circle diameter in the plane of rotation 80mm and helix angle 30 deg; Gear B has pitch circle diameter in the plane of rotation 120mm and helix angle 22.5 deg. If the input speed is 1440 RPM, thenoutput speed in RPM is
(a) 1200 (b) 875
(c) 900 (d) 700
Answer: (c)
22. The moisture in a refrigerant is removed by:
(a) dehumidifiers (b) safety relief vale
(c) driers (d) expansion valve
Answer: (c)
23. In an arc welding process, the voltage and current are 25 V and 300 A respectively. The arc heat transfer efficiency is 0.85 and welding speed is 8 mm/sec the net heat input (in J/mm)
(a) 64 (b) 797
(c) 1103 (d) 79700
Answer: (b)
24. Hardness of steel greatly improves with
(a) annealing (b) cyaniding
(c) normalizing (d) tempering
Answer: (d)
25. Work Material Type of Joining
P Aluminium 1. Submerged Arc Welding
Q Die Steel 2. Soldering
R Copper Wire 3. Thermit Welding
S Titanium Shet 4. Aromic Hydrogen Welding
5. Gas Tungsten Arc Welding
6. Laser Beam Welding
(a) P-2, Q-5, R-1, S-3 (b) P-6, Q-3, R-4, S-4
(c) P-4, Q-1, R-6, S-2 (d) P-5, Q-4, R-2, S-6
Answer: (d)
26. List A List B
P Isobaric thermal expansion coefficient 1. 0
Q Isothermal compressibility 2. ∞
R Isentropic compressibility 3. 1/v
S Joule Thomson Coefficient 4. 1/T
5. 1/P
6. 1/γp
(a) P-4, Q-2, R-3, S-6 (b) P-3, Q-5, R-4, S-1
(c) P-2, Q-4, R-1, S-5 (d) P-4, Q-5, R-6, S-1
Answer: (d)
27. If the mass of moist air in an airtight vessel is heated to a higher temperature, then
(a) Specific humidity of air increases (b) Specific humidity of air decreases
(c) Relative humidity of air increases (d) Relative humidity of air decreases
Answer: (d)
28. Threaded bolts of A and B of same material and length are subjected to identical tensile load. If the elastic strain energy stored in bolt A is 4 times that of bolt B and the mean diameter of bolt A is 12 mm, then mean diameter of bolt B is
(a) 16 (b) 24
(c) 36 (d) 48
Answer: (b)
29. In a condenser of a power plant, the steam condenses at a temperature at a 333 K. The cooling water enters at 303 K and leaves at 318 K. The logarithmic mean temperature difference (LMTD) of the condenser is
(a) 16.2 C (b) 21.6 C
(c) 30 C (d) 37.5 C
Answer: (b)
30. The shear strength of a sheet metal is 300 Mpa. The blanking force required to produce a blank of 100 mm diameter from a 1.5 mm thick sheet is
(a) 45 kN (b) 70 kN
(c) 141 kN (d) 350 kN
Answer: (c)
31. A heat engine is supplied heat at the rate of 1700 kJ/min and gives an output of 9 kW. Thermal efficiency and heat rejection in kW of heat engine is
(a) 34.0%, 11.0 (b) 28.3%, 10.0
(c) 31.76%, 19.33 (d) 32.3%, 9.83
Answer: (c)
32. When we have combined free and forced convection, Gr/Re^2 is
(a) greater than 1 (b) less than 1
(c) almost equal to 1 (d) equal to Peclet Number
Answer: (c)
33. A refrigerator and heat pump operate between the same temperature limits. COP of refrigerator is 4, COP of heat pump would be
(a) 3 (b) 5 (c) 4 (d) data not adequate
Answer: (b)
34. A carnot refrigerator requires 1.25 kW per ton of refrigeration to maintain a temperatue of 233 K. Its higher operating temperature of the cycle
(a) 318 K (b) 313 K (c) 315 K (d) 316 K
Answer: (d)
35. The work input to air compressor is minimum if the compression law followed is
(a) isentropic (b) PV =C (c) $PV^1.2 =C$ (d) $VP^1.35 =C$
Answer: (b)
36. Operating pressure of the refrigerants at the evaporator in the ascending order for any application are
(a) R11, R12, R717, R22 (b) R22, R717, R12, R11
(c) R11, R12, R22, R717 (d) R717, R22, R11, R12
Answer: (a)
37. For vapour compression system using R717 the material of pipe is
(a) Steel (b) Copper (c) Brass (d) Aluminium
Answer: (a)
38. Air at DBT of 308K and DPT of 293 K passes through a cooling coil which is maintained at 298 K. The process would be
(a) cooling and de-humidification (b) sensible cooling
(c) cooling and humidification (d) can not predict
Answer: (b)
39. Room sensible heat loss is 30000 kJ/min and room latent heat loss is 20000 kJ/min. Sensible heat factor is
(a) -0.6 (b) 0.6 (c) 0.3 (d) 3
Answer: (b)
40. Domestic refrigerator working on vapour compression cycle uses the following of expansion device
(a) Manually operated valve
(b) thermostatic valve
(c) expansion valve
(d) capillary tube
SOLUTION OF THE WRITTEN TEST BY ISRO FOR SCIENTIST/ENGINEER 'SC' (REFRIGERATION & AIRCONDITIONING) [BE006 & BE010] -2014
1. The condition of stable equilibrium foe a floating body is:
(a) metacentre coincides with centre of gravity
(b) metacentre is below centre of gravity
(c) metacentre is above centre of gravity
(d) centre of buoyancy is above centre of gravity
Answer: (c)
2. The thickness of turbulent boundary layer at a distance x from the leading edge over a flat plate varies as
(a) $x^{0.8}$ (b) $x^{0.5}$
(c) $x^{0.2}$ (d) $x^{0.6}$
Answer: (a)
3. The diameters of a pipe at the section 2 and 2 are 10 cm and 15 cm respectively. Velocity of water flowing through the pipe at section 1 is 5 m/s. Velocity at section 2 in m/s and discharge in cmm is
(a) 2.2 & 2.4 (b) 2.7 & 2.8
(c) 2.1 & 2.4 (d) 2.4 & 2.6
Answer: (a)
4. The velocity distribution foe flow over a flat plate is given $u = \frac{3 y}{4} - y^2$ in which u is the velocity in m/s at a distance y meter above the plate. Shear stress at y = 0.15m is (Take viscosity for fluid is 8.5 poise)
(a) 0.3825 Pa (b) 0.3815 Pa
(c) 0.3835 Pa (d) 0.3845 Pa
Answer: (a)
5. A gas weighs 16 N/m3 at 288 K and at an adibatic pressure of 25 N/cm2. Its gas constant is
(a) 532 J/kg K (b) 544 J/kg K
(c) 553 J/kg K (d) 523 J/kg K
Answer: (a)
6. A pipe line AB of diameter 30 cm and of length 400 m carries water at the rate of 50 liters/sec. The flow takes place from A to B where point B is 30 meters above A. Pressure at B is 2 ksc. Pressure at A is (Take f =0.008)
(a) 5.2 ksc (b) 5.3 ksc
(c) 5.0 ksc (d) 5.1 ksc
Answer: (d)
7. A nozzle is fitted at the end of a pipe of length 300m and of diameter 10 cm for transmitting water. What is the diameter of the nozzle considering maximum transmission of power through the nozzle (f =0.009)
(a) 2.6 cm (b) 2.5 cm
(c) 2.4 cm (d) 2.7 cm
Answer: (a)
8. A turbine develops 500 kW under a head of 100 meters at 200 RPM. Its normal speed and power under a head of 81 meters
(a) 184 RPM and 375 kW (b) 180 RPM and 365 kW
(c) 184 RPM and 370 kW (d) 180 RPM and 361 kW
Answer: (b)
9. Number of degrees of freedom in a Ball socket joint:
(a) 1 (b) 2 (c) 3 (d) 0
Answer: (c)
10. Two inelastic spheres of masses 10 kg each move with velocities of 15 m/s and 5 m/s respectively in the same direction. The loss in kinetic energy when they collide
(a) 500 Nm (b) 0 (c) 250 Nm (d) 1000 Nm
Answer: (c)
11. In order to have maximum power from a Pelton turbine, the bucket speed must be
(a) equal to the jet speed
(b) equal to half of the jet speed
(c) equal to twice the jet speed
(d) independent of the jet speed
Answer: (b)
12. The alloying element mainly used to improve the endurance strength of steel material is
(a) Nickel (b) Vanadium
(c) Molybdenum (d) Tungusten
Answer: (b)
13. The percentage improvement in power capacity of a flat belt drive, when the wrap angle at the driving pulley is increased from 150 deg to 210 deg by an idler arrangement for a friction coefficient of 0.3 is
(a) 25.21 (b) 33.92 (c) 40.17 (d) 67.85
Answer: (d)
Power, P = (T1-T2)R and $\frac{T_1}{T_2} = e^{μθ}$
hence $P ∝ (1-e^{μθ})$
percentage improvement = (P1-P2)*100/P1 = 67.85
14. In an interchangeable assembly, shaft of size $25.000^{+0.04}_{-0.01}$ mm mates with a hole of size $25.000^{+0.03}_{+0.03}$ mm. Maximum interface in microns in the assembly is
(a) 40 (b) 30 (c) 10 (d) 20
Answer: (d)
15. A column has a rectangular cross section of 10 x 20 mm and a length of 1m. The slenderness ratio of the column is close to
(a) 200 (b) 346 (c) 477 (d) 1000
Answer: (b)
16. A thin cylinder of inner radius 500 mm and thickness 10 mm is subjected to an internal pressure of 5 MPa. The average hoop stress in MPa is
(a) 100 (b) 250 (c) 500 (d) 1000
Answer: (b)
17. A circular disk of uniform thickness 20 mm, radius 200 mm and mass 20 kg is used as flywheel. If it rotates at 600 rpm, kinetic energy of flywheel in Joule is
(a) 395 (b) 790 (c) 1580 (d) 3160
Answer: (b)
18. A vibration system consists of a mass of 175 kg, a spring stiffness 700 N/cm and damper with a damping coefficient of 7 N-sec/cm. Damping factor of the system is
(a) 0.15 (b) 0.25 (c) 0.2 (d) 0.1
Answer: (d)
19. Two cutting tools are being compared for a machining operation. The tool life equations are Carbide tool: $VT^1.6 = 3000$; HSS tool : $VT^0.6 = 200$, where V is the cutting speed in m/min and T is tool life in min. The carbide tool will provide higher tool life if the cutting speed in m/min exceedds
(a) 39.4 (b) 15 (c) 60 (d) 49.3
Answer: (a)
20. The diameter of suction side of a reciprocating compressor compared to its delivery side is
(a) smaller (b) equal (c) bigger (d) varies according to capacity
SOLUTION OF THE WRITTEN TEST BY ISRO FOR SCIENTIST/ENGINEER 'SC' (REFRIGERATION & AIRCONDITIONING) [BE006 & BE010] -2017
61.For air with a relative humidity of 80%
(a) The dry bulb temperature is less than wet bulb temperature
(b) The dew point temperature is less than wet bulb temperature
(c) The dew point and wet bulb temperatures are equal
(d) The dry bulb and dew point temperatures are equal
Answer: (b)
62. During evaporative cooling process, wet bulb temperature
(a) Increases (b) decreases
(c) remains constant (d) unpredictable
Answer: (c)
63. In a psychrometric process, the sensible heat added is 30 kJ/sec and latent heat added is 20 kJ/sec. The sensible heat factor for the process is
(a) 0.3 (b) 0.6 (c) 0.67 (d) 1.5
Answer: (b)
64. The bypass factor of cooling coil decreases with
(a) Decrease in fin spacing and increase in number of rows
(b) Increase in fin spacing and increase in number of rows
(c) Increase in fin spacing and decrease in number of rows
(d) Decrease in fin spacing and decrease in number of rows
Answer: (a)
65. The wet bulb depression is zero when relative humidity is
(a) 0% (b) 50% (c) 75% (d) 100%
Answer: (d)
66. In the metal cutting process, the high cutting speed and large angle of the tool will result in the formation of
(a) continuous chips
(b) discontinuous chips
(c) continuous chips with built up edge
(d) chips of irregular shapes
Answer: (a)
67. Gear hobbing produces more accurate gears than milling, because in hobbing
(a) There is continuous indexing operation
(b) Both hob and work piece are rotating
(c) Pressure angle is larger than in milling
(d) A special multi-tooth cutter is used
Answer: (a)
68. The type of tool used in milling machine and broaching machine is
(a) single point cutting tool (b) two point cutting tool
(c) three point cutting tool (d) multi-point cutting tool
Answer: (d)
69. The Ackerman steering gear mechanism is preferred to Davis steering mechanism because
(a) Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
(b) The Ackerman steering gear consists of sliding pairs
(c) The Ackerman steering gear is most economical
(d) Davis steering gear consists of turning pairs
Answer: (a)
70. The natural frequency of free torsional vibrations of a shaft with torsional stiffness q and I is the mass moment of inertia of the disc attached to the end of the shaft is
(a) $2\pi \sqrt{\frac{q}{I}}$ (b) $2\pi \sqrt{qI}$ (c) $\frac{1}{2 \pi} \sqrt{\frac{q}{I}}$ (d) $\frac{1}{2 \pi} \sqrt{qI}$
Answer: (c)
71. A is a 3 × 4 real matrix and Ax = b is a consistent system of equations. The highest
possible rank of A is
(a) 1 (b) 2 (c) 3 (d) 4
Answer: (c)
72. The value of the quantity P where $P = \int_{0}^{1} xe^x dx$ is equal to
(a) 0 (b) 1 (c) e (d) 1/e
Answer: (b)
73. The solution of the differential equation $\frac{dy}{dx} = \frac{-x}{y}$ at x = 1 and y = √3 is
(a) $x-y^2 = -2$ (b) $x+y^2 = -4$
(c) $x^2-y^2 = 2$ (d) $x^2+y^2 = 4$
Answer: (d)
74. The analytic function $f(z) = \frac{z-1}{z^2 +1}$ has singularities at
(a) 1 and – 1 (b) 1 and 1
(c) 1 and –i (d) i and –i
Answer: (d)
75. X is a uniformly distributed random variable that takes value between 0 and 1. The value of E(X3) will be
(a) 0 (b) 1/8
(c) 1/4 (d) 1/2
Answer: (c)
76. The equation $e^x -1 = 0$ is required to be solved using Newton’s method with an initial guess of x0 = -1. Then after one step of Newton’s method, the estimate x1 of the solution will be
(a) 0.71828 (b) 0.36784 (c) 0.20587 (d) 0.0000
Answer: (a)
77. Laplace transform of $f (t) = t^2 sint$ is
(a) $\frac{3s^2-1}{(s^2+1)^3}$ (b) $\frac{2(3s^2-1)}{(s^2+1)^3}$
78. The residue of a complex function $x(z) = \frac{1-2z}{z(z-1)(z-2)}$ at its poles are
(a) 1/2, 1/2 and 1 (b) 1/2, 1/2 and -1
(c) 1/2, 1 and -3/2 (d) 1/2, -1 and 3/2
Answer: (c)
79. The solution of the differential equation $\frac{dy}{dx} + y^2 =0 $ is
(a) $Y = \frac{1}{x+c}$ (b) $Y = \frac{-x^3}{3} +c$
(c) $Y = ce^x$ (d) unsolvable as the equation is non-linear
Answer: (a)
80. A box contains 10 screws, 3 of which are defective. Two screws are drawn at random
with replacement. The probability that none of the two screws will be defective is:
(a) 100% (b) 50% (c) 49% (d) none of these
