ME GATE 2007 - Online Test
Q1. Atmospheric air at a flow rate of 3 kg/s (on dry basis) enters a cooling and dehumidifying coil with an enthalpy of 85 kJ/ kg of dry air and a humidity ratio of 19 grams/kg of dry air. The air leaves the coil with an enthalpy of 43 kJ/kg of dry air and a humidity ratio of 8 grams/kg of dry air. If the condensate water leaves the coil with an enthalpy of 67 kJ/kg, the required cooling capacity of the coil in kW is
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. A ball bearing operating at a load
F has 8000 hours of life. The life of the bearing,
in hours, when the load is doubled to
2F is
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. A heat transformer is device that transfers a part of the heat, supplied to it at an intermediate temperature, to a high temperature reservoir while rejecting the remaining part to a low temperature heat sink. In such a heat transformer, 100 kJ of heat is supplied at 350 K. The maximum amount of heat in kJ that can be transferred to 400 K, when the rest is rejected to a heat sink at 300 K is
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. A model of a hydraulic turbine is tested at a head of 1/4th 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, the RPM of the model will be
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. Which combination of the following statements is correct ?
The incorporation of reheater in a steam power plant :
P : always increases the thermal efficiency of the plant.
Q : always increases the dryness fraction of steam at condenser inlet
R : always increases the mean temperature of heat addition.
S : always increases the specific work output.
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Which combination of the following statements is correct ?
P : A gas cools upon expansion only when its Joule-Thomson coefficient is
positive in the temperature range of expansion.
Q : For a system undergoing a process, its entropy remains constant only when
the process is reversible.
R : The work done by closed system in an adiabatic is a point function.
S : A liquid expands upon freezing when the slope of its fusion curve on
pressure-Temperature diagram is negative
Answer : Option A
Explaination / Solution:
No Explaination.
Q7. A uniformly loaded propped cantilever beam and its free body diagram are shown
below. The reactions are
Answer : Option A
Explaination / Solution:
No Explaination.
Q8. Which combination of the following statements about steady incompressible
forced vortex flow is correct ?
P: Shear stress is zero at all points in the flow.
Q: Vorticity is zero at all points in the flow.
R: Velocity is directly proportional to the radius from the center of the vortex.
S: Total mechanical energy per unit mass is constant in the entire flow field.
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. A stepped steel shaft shown below is subjected to 10 Nm torque. If the modulus
of rigidity is 80 GPa, the strain energy in the shaft in N-mm is
Answer : Option C
Explaination / Solution:
No Explaination.
Q10. Match List-I with List-II and select the correct answer using the codes given
below the lists :
Codes:
Answer : Option A
Explaination / Solution:
No Explaination.
