Organisation : Teachers Recruitment Board
Exam : TRB Polytechnic Lecturer Exam
Document Type : Model Question Paper
Subject : Mechanical Engineering
Website : http://trb.tn.nic.in/
TRB Polytechnic Lecturer Exam Question Paper
Download Question Paper of TRB Polytechnic Lecturer Exam Sample Question is now available in the official website of Teachers Recruitment Board.
Related : Tamil Nadu Teacher Eligibility TNTET Model Question Paper : www.pdfquestion.in/73.html
Mechanical Engineering
Virtual work refers to :
(A) Virtual work done by Virtual forces
(B) Virtual work done by Actual forces
(C) Actual work done by Actual forces
(D) Actual work done by Virtual forces
A body moving from rest along a straight line with an acceleration which equation is e a a=4 where a-m/s2, t-seconds. Its velocity and distance travelled in 6 seconds :
(A) 10 m/s, 40 m
(B) 12 m/s, 50 m
(C) 16 m/s, 60 m
(D) 14 m/s, 55 m
Download Question Paper :
https://www.pdfquestion.in/uploads/pdf2019/34329-TRBMech.pdf
Co-efficient of expansion and modulus of elasticity for steel and aluminum are
(A) 12×10-6/°C, 18 x 10-6/°C, 200 Gpa, 80 Gpa
(B) 14 x 10-6/°C, 20×10-6/°C, 220 GPa, 90 Gpa
(C) 11×10-6/°C, 17×10-6/°C, 190 GPa, 70 Gpa
(D) 13 x 10-6/°C, 19×10-6/°C, 210 Gpa, 80 Gpa
If a body is stressed within its elastic limit, the lateral Strain bears a constant ratio to the linear Strain. This constant known as
(A) Poisson’s Ratio
(B) Volume Ratio
(C) Stress Ratio
(D) Strain Ratio
If one litre of a fluid has a mass of 7.5 kg then its specific gravity is
(A) 0.75
(B) 7.5
(C) 75
(D) 750
A plate 0.02 mm distant from a fixed plate moves at 20 cm/s requires a shear stress of 4 N/m2 to maintain this speed. Viscosity of fluid available inside these plates is Ns
(A) 4×10-4 poise
(B) 4×10–6 poise
(0) 4×10-5m? 4×10-4 NS m
It is required to find pressure difference between two horizontal pipes through which water is flowing using inverted manometer. Two manometric fluids with specific gravities 13.6 and 0.8 and are available. Which manometric fluid is to be used now?
(A) Fluid with specific gravity 13.6
(B) Fluid with specific gravity 0.8
(C) Both fluids can be used
(D) None can be used
A continuous line drawn through the fluid so that it has the direction of velocity vector at every point is known as:
(A) Streak line
(B) Path line
(C) Stream tube
(D) Stream line
Which of the following devices is having working principle based on Bernoulli equation
(A) Venturi meter
(B) Pitot tube
(c) Orifice meter
(D) All of the above
Which of the following is not a point function of the system.
(A) Temperature
(B) Pressure
(C) Specific volume
(D) Heat
During melting the volume of a pure substance other than water :
(A) Decreases
(B)Increases
(C)Remains constant
(D) First increases and then decreases
The work done during an isothermal process is ISA 10087
(A) PV, 105
(7) (C) e_vzlos_(*)
(B) PzV2loge (1)
(D) P?V=RVI
For winter air conditioning, the relative humidity should not be more than :
(A) 60%
(B) 75%
(C) 40%
(D) 90%
In a vapour compression system, the condition of refrigerant before entering the compressor is
(A) Saturated liquid
(B) Wet vapour
(C) Superheated vapour
(D)Dry saturated vapour
Metre is defined as distance between the centre portion of two lines engraved on polished surface of a bar of
(A) 90% platinum and 10% irridium at 15°C
(B) 90% platinum and 10% irridium at 0°C
(C) 75% platinum and 25% irridium at 15°C
(D) 75% platinum and 25% irridium at 0°C
The type of energy used in electrical discharge wire cutting is
(A) Mechanical Energy
(B) Chemical Energy
(C) Electrical Energy
(D) Thermal Energy
The size by which it is referred to as a matter of convenience
(A) Actual size
(B) Basic size
(C) True size
(D) Nominal size
Four parts with the following dimensions are to be assembled in random. What should be tolerance on the assembled length ? +0.02 Part 1= 25.32_001 mm Part 2=18.91 + 0.03 mm ph. Part 3-694 +0.05 Part 4=46.25 +0.04 mm -0.07 mm +0.15
(A) 152.65_014.
(B) 152.65
(C) +0.14 152.65_ 3 .0-0.15
(D) 145.52 +0.02 190.02_007
Why the Bezier curve is smoother than the cubic spline curve ?
(A) Because of higher order derivatives
(B) Because of control points
(C) Because the curve passes through all the data points
(D) All of the above
(2 3 4) 26. If A= 0 4 2 , the eigen values of adj A and of A2-2A +I are : (003)
(A) 2, 4, 3 and 49, 121, 25
(C) 4, 16, 9 and 16, 256, 81
(B) 8, 12, 6 and 49, 121, 25
(D) 8, 12, 6 and – 49, 100, 12
The function f(x) = Inxttan *x is :
(A) Continuous in the interval (-0,-)
(B) Continuous in the intervals (-8, -1), (-1, 1)(1,c)
(C) Continuous in the interval (0,1) and (1,-)
(D) Continuous in the interval (-00,00), except at integer points
The extreme values of f (x, y)=y2 – x2 are: 0
(A) 3, -2
(B) 0
(C) -1,1
(D)has no extreme value.