ISRO Mechanical Sample Question Paper 2013 : Indian Space Research Organisation

Organisation : ISRO/ Indian Space Research Organisation
Subject : Mechanical Paper
Document Type : Sample Question Paper
Post : Scientist/Engineer

Website : https://www.isro.gov.in/
Download Sample Question Paper 2013: https://www.pdfquestion.in/uploads/8536MH2013.pdf
Download Sample Question Paper 2012: https://www.pdfquestion.in/uploads/8536MH2012.pdf
Download Sample Question Paper 2011: https://www.pdfquestion.in/uploads/8536MH2011.pdf
Download Sample Question Paper 2010: https://www.pdfquestion.in/uploads/8536MH2010.pdf
Download Sample Question Paper 2009: https://www.pdfquestion.in/uploads/8536MH2009.pdf

Mechanical Sample Question Paper :

1. A concentrated load P is applied at the end of a cantilever as shown in Fig. The cross section of the beam is a square of side ’a’ with a hole of dia ’a/2′. The deflection at the tip of the cantilever is given by

Related : Indian Space Research Organisation ISRO ISRO Electronics Sample Question Paper : www.pdfquestion.in/8534.html

2. A cantilever beam is subjected to a UDL. The cross section of the beam is a H-Section placed as shown in Fig. The bending stress distribution across the cross section will be

3. A thick cylinder of inner dia ‘0‘, wall thickness t2 and length ‘L’ is sealed at its both ends with ‘ caps. The thickness of the cap is t1. Allowable tensile yield stress = a”), and allowable shear tress = ry. A gas is pumped into this cylinder at pressure ’p’. The cap will yield in shear at circumference of diameter ‘0′ when the gas pressure applied is more than

4. A rod of 20 dia is fixed to the ceiling of a roof on one end.- A rotor of 50 kg mass is attached to the free end with bearings. The C6 of the rotor is 10 mm away from the shaft axis. The rotor is rotating at 600 rpm. The max tensile stress (in N/ Sq.mm) in the rod is nearly equal to

5. An automotive engine having a mass of 135 kg is supported on 4 springs with linear characteristics. Each of the 2 front springs have stiffness of 3 MN/m while the stiffness of each of 2 rear springsis 4.5 MN/m. The engine speed (rpm) at which resonance is likely to occur is

6. A weighing m/c consists of a 2 kg pan resting on a spring having linear characteristics. In this condition of resting on the spring, the length of spring is 200mm. When a 20 kg mass is placed. on the pan, the length of the spring becomes 100mm. The under formed length L in mm and the spring stiffness K in N/m.

7. A circular shaft is subjected to a torque ’T’ and a Bending Moment M. The ratio of max. shear stress to max. bending stress is
8. A solid block ’A’ wéighing ’Q’ kg is resting on a flat floor. A smooth cylinder ’8′ weighing ’P’ 9 kg. is placed between the solid A and the vertical wall as shown in fig. The friction between the cylinder, wall and the block A is negligible. The co-efficient of friction between the block A and floor is u. The minimum weight P required to disturb the block A is

9. A hydraulic jack is used to compress a spring as shown in fig. Stiffness of spring is 105 N/m. By applying a pressure ’p’ in the hydraulic cylinder, the spring gets compressed by 16mm. The 10 cross sectional area of the piston is 25 cmz. The applied pressure ’p is

Multiple Choice Questions :

11. A small plastic boat loaded with pieces of steel rods is floating in a bath tub. If the cargo is dumped into the water , allowing the boat to ?oat empty, the water level in the tub will
(a) Rise
(b) Fall
(c) Remains the same
(d) Rise and then fall

12. Viscosity of water in comparison to mercury is
(a) higher
(b) lower
(c) same
(d) unpredictable

13. Froude number is signi?cant in:
(a) Supersonic, as with projectile and jet propulsion
(b) Full immersion or completely enclosed flow, as with pipes, air crafts wings, nozzles, etc.
(c) Simultaneous motion through two fluids where there is a surface discontinuity, gravity forces and wave making effect, as with ship’s hulls
(d) All of these

14. The purpose of surge tank in a pipe line is to
(a) smooth-en the flow of water
(b) minimize friction losses in pipe
(c) prevent occurrence of hydraulic jump
(d) relieve pressure due to water hammer

15. Head loss in turbulent flow in a pipe
(a) varies directly as velocity
(b) varies inversely as square of velocity
(c) varies approximately as square of velocity
(d) varies inversely as velocity

16. A tank 1.5m stands on a trolly and is full of water. It has an price of diameter 0.1m at 0.3m from the bottom of the tank. if the orifice is suddenly opened and coefficient of discharge of the orifice is 0.60, then the propelling force on the trolley will be
(a) 69.37 N
(b) 67.39 N
(c)463.79 N
(d) 65.39 N

17. A model of a hydraulic turbine is tested at a head of 1/4‘“ of that under which the full scale turbine works. The diameter of the model is half of that of the full scale turbine. if N is the RPM of the full scale turbine, then RPM of the model will be
(a) N/4 l
(b) N/2 I
(c) N l
(d) 2N

18. Consider steady, in compressible and irrational flow through a reducer in a horizontal pipe, where the diameter is reduced from 20 cm to 10 cm. The pressure in the 20 cm pipe just upstream of the reducer is 150 kPa . The fluid has a vapour pressure of 50 kPa and a specific weight of 5 kN/m3 . Neglecting frictional effects, the maximum discharge (in m3 lsec ) that can pass through the reducer without causing capitations is
(a) 0.05
(b)0.16
(c) 0.27
(d)0.38

19. For the stability of a floating body, under the influence of’ gravity alone, which of the following is true?
(a) Metacentre should be below the centre of gravity
(b) Metacentre should be above the centre of gravity
(c) Metacentre and centre of gravity must lie on the same horizontal line
(d) Metacentre and centre of gravity must lie on the same vertical line

20. A smooth pipe of diameter 200mm carries water. The pressure in the pipe at Section 51 (elevation: 10m) is 50 kPa . At section 52 (elevation: 12 m ) the pressure is 20 kPa and velocity is 2 m/sec . Density of water is 1000 kg/ m3 and acceleration due to gravity is 9.8 m/ sec 2 . Which of the following is true?
(a) Flow is from $1 to $2 and head loss is
(b) Flow is from 52 to $1, and head loss is 0.53m
(c) Flow is from $1 to $2 and head loss is
(d) Flow is from 52 to $1 and head loss is 1.06m
[embeddoc url=”https://www.pdfquestion.in/uploads/8536MH2013.pdf”]