Mechanical Engineering Gate Yearwise
Mechanical Engineering Gate 2015 Set-2 Questions with Answer
Ques 53 GATE 2015 SET-2
A gas is stored in a cylindrical tank of inner radius 7 m and wall thickness 50 mm. The gage pressure of the gas is 2 MPa. The maximum shear stress (in MPa) in the wall is
Ques 54 GATE 2015 SET-2
The uniaxial yield stress of a material is 300 MPa. According to von Mises criterion, the shear yield stress (in MPa) of the material is ________.
Ques 55 GATE 2015 SET-2
In a certain slider-crank mechanism, lengths of crank and connecting rod are equal. If the crank rotates with a uniform angular speed of 14 rad/s and the crank length is 300 mm, the maximum acceleration of the slider (in m/s2) is ________.
Ques 56 GATE 2015 SET-2
The number of degrees of freedom of the planetary gear train shown in the figure is
Ques 57 GATE 2015 SET-2
A rope-brake dynamometer attached to the crank shaft of an I.C. engine measures a brake power of 10 kW when the speed of rotation of the shaft is 400 rad/s. The shaft torque (in N-m) sensed by the dynamometer is ________.
Ques 58 GATE 2015 SET-2
Work is done on an adiabatic system due to which its velocity changes from 10 m/s to 20 m/s, elevation increases by 20 m and temperature increases by 1 K. The mass of the system is 10 kg, Cv = 100 J/(kg.K) and gravitational acceleration is 10 m/s2. If there is no change in any other component of the energy of the system, the magnitude of total work done (in kJ) on the system is ________.
Ques 59 GATE 2015 SET-2
One kg of air (R = 287 J/kg-K) undergoes an irreversible process between equilibrium state 1 (20°C, 0.9 m3) and equilibrium state 2 (20°C, 0.6 m3). The change in entropy s2-s1 (in J/kg-K) is ________.
Ques 60 GATE 2015 SET-2
For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto, Dual and Diesel cycles is
Ques 61 GATE 2015 SET-2
In a Rankine cycle, the enthalpies at turbine entry and outlet are 3159 kJ/kg and 2187 kJ/kg, respectively. If the specific pump work is 2 kJ/kg, the specific steam consumption (in kg/kW-h) of the cycle based on net output is ________.
Ques 62 GATE 2015 SET-2
Which of the following statements regarding a Rankine cycle with reheating are TRUE?
(i) increase in average temperature of heat addition
(ii) reduction in thermal efficiency
(iii) drier steam at the turbine exit
Ques 63 GATE 2015 SET-2
The COP of a Carnot heat pump operating between 6°C and 37°C is ________.
Ques 64 GATE 2015 SET-2
The Van der Waals equation of state is (p + a/v2)(v-b) = RT, where p is pressure, v is specific volume, T is temperature and R is characteristic gas constant. The SI unit of a is
Ques 65 GATE 2015 SET-2
A single-degree-freedom spring-mass system is subjected to a sinusoidal force of 10 N amplitude and frequency ω along the axis of the spring. The stiffness of the spring is 150 N/m, damping factor is 0.2 and the undamped natural frequency is 10 rad/s. At steady state, the amplitude of vibration (in m) is approximately
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