Engineering, 21.04.2020 16:09 Itssata
Air enters a compressor operating at steady state at 1 atm with a specific enthalpy of
290 kJ/kg and exits at a higher pressure with a specific enthalpy of 1023 kJ/kg. The mass flow rate is 0.1 kg/s. Kinetic and potential energy effects are negligible and the air can be modeled as an ideal gas.
If the compressor power input is 77 kW, the rate of heat transfer between the air and its surroundings is
Option A: 3.7 kW from the surroundings to the air.
Option B: 150.3 kW from the air to the surroundings.
Option C: 3.7 kW from the air to the surroundings.
Option D: 150.3 kW from the surroundings to the air.
Steam enters a turbine operating at steady state with a specific enthalpy of 1407.6 Btu/lb and expands to the turbine exit where the specific enthalpy is 1236.4 Btu/lb . The mass flow rate is 5 lb/s. During this process, heat transfer to the surroundings occurs at a rate of 40 Btu/s
Neglecting kinetic and potential energy effects, the power developed by the turbine is
Option A: 816 Btu/s
Option B: 896 Btu/s
Option C: 656 Btu/s
Option D: 74.2 Btu/s
Answers: 2
Engineering, 04.07.2019 18:10
Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?
Answers: 3
Engineering, 04.07.2019 18:10
Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.
Answers: 1
Engineering, 04.07.2019 18:20
Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?
Answers: 1
Engineering, 04.07.2019 18:20
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.
Answers: 2
Air enters a compressor operating at steady state at 1 atm with a specific enthalpy of
2...
2...
Mathematics, 31.05.2020 22:58
Mathematics, 31.05.2020 22:58
Physics, 31.05.2020 22:58
Chemistry, 31.05.2020 22:58
Mathematics, 31.05.2020 22:58
Mathematics, 31.05.2020 22:58
English, 31.05.2020 22:58