1. An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minute spark. The contents of vessel experience
(a) increase in temperature, pressure and energy
(b) decrease in temperature, pressure and energy
(c) increase in temperature and pressure but increase in energy
(d) Increase in temperature and pressure but no change in energy
2. The specific heat of ideal gas depend on
(a) Temperature (b) Volume
(c) Molecular weight and structure (d) Pressure
Answer: Excluded from Evaluation
3. Thermal power plant works on
(a) Carnot cycle (b) Joule cycle
(c) Rankine cycle (d) Brayton cycle
4.In an isothermal process, the internal energy of molecules
(a) Increases (b) Decreases
(c) Depends on temperature (d) Remains constant
5.For reversible adiabatic process, change in entropy is
(a) positive (b) negative
(c) zero (d) depends on pressure
6. A cylinder contains 5 m3 of an ideal gas at a pressure of 1. This gas is compressed in a reversible isothermal process till its pressure increases to 5 bar. The work in kJ required for this process is
(a) 804.7 (b) 953.5
(c) 987.5 (d) 1012.3
7. A steel ball of mass 1 kg and specific heat 0.4 kj/kg is at a temperature of 60 deg C. It is dropped into 1 kg of water at 20 deg C. The final steady temperature of water is
(a) 23.48 deg C (b) 32.28 deg C
(c) 20 deg C (d) 30 deg C
8. A Bell-Coleman cycle is a reversed [ISRO RAC 2018]
(a) Carnot cycle (b) Otto cycle
(c) Joule cycle (d) Rankine cycle
9. A free bar of length l is uniformly heated from 0°C to a temperature t°C. a is the coefficient of linear expansion and E is the modulus of elasticity. The stress in the bar is
(a) αTE (b) E/ αT
(c) Zero (d) None of the above
10. The materials having same elastic properties in all directions are called
(a) elastic materials (b) uniform materials
(c) isotropic materials (d) plastic materials
11. A large cylindrical vessel was sealed in summer. What is likely to happen to it in winter?
(a) Nothing
(b) become lighter
(c) buckle and collapse
(d) seal getting loosened
12. A concentrated load P acts on a simply supported beam of span L at a distance of L/3 from left support. The bending moment at the point of application of load is given by
(a) PL/3 (b) PL/9
(c) 2PL/9 (d) PL/6
13. Moment of inertia (about its neutral axis) of hollow rectangular section with overall
width and depth as B and D and hollow rectangular hole as b and d is
(a) 1/16 $(BD^3 − bd^3 )$ (b) 1/32 $(BD^3- bd^3 )$
(c) $(BD^3 -bd^3 )$ (d) 1/12 $(BD^3- bd^3 )$
14.Neutral plane of the beam
(a) Is in the middle
(b) Is one whose length remains unchanged during deformation
(c) Passes through centre of gravity
(d) Lies at the top most fiber
15. Section modulus is defined as
(a) Moment of inertia about the neutral axis/square of the distance of neutral axis from farthest point
(b) Moment of inertia about the neutral axis/ distance of the most distant point from neutral axis.
(c) Bending moment/Moment of Inertia
(d) None of the above
16.Maximum deflection in a beam of span l supported freely at both ends due to central
load P at middle with Young’s modulus E and moment of inertia I is
(a) $\frac{Pl^3}{64EI}$ (b) $\frac{Pl^3}{32EI}$
(c) $\frac{Pl^3}{48EI}$ (d) $\frac{Pl^3}{96EI}$
17. For a given material, Young’s modulus = 200GN/m2 and modulus of rigidity = 80GN/m2 . Its bulk modulus will be
(a) 100.22 GN/m2 (b) 120.33 GN/m2
(c) 133.33 GN/m2 (d) 250.44 GN/m2
18. A hollow shaft of 20 mm diameter and 16 mm inside diameter is subjected to a torque of 40 Nm. The shear stress at outside of the shaft will be:
(a) 53.12 N/mm2 (b) 43.13 N/mm2
(c) 62.52 N/mm2 (d) 34.50 N/mm2
19. If two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
(a) polar moment of inertia (b) polar modulus of section
(c) diameter (d) angle of twist
20. Carbon content of mild steel can be
(a) 0.51% (b) 0.85% (c) 0.15% (d) 1.5%
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