Mechanical Engineering Answers

A fluid enters a turbine at the rate of 14kg/s with an initial enthalpy of 2762kj/kg and leaves with a final enthalpy of 2607kj/kg. Find the power developed if the turbine has an efficiency of 0.85.

1500kg of steam is to be produced per hour with an enthalpy of 3077kj/kg. The feed water supplied to the boiler has an enthalpy of 167.5kj/kg. The velocities of the water at inlet and the steam at exit are 2m/s and 45m/s respectively. find the rate at which heat must be supplied to the boiler.

6. A man invested P36,000 at 12% interest compounded quarterly. In how many years

will the money earned P200,000?

5. If the money invested will earned P200,000 after 10 years at 16% compounded

annually, what is the principal amount?

4. A man deposited P45,000 and the bank promised that the money will earn 90,000 10

years from now. Determine the interest of money if compounded annually.

1. A man applied for a loan with 16% interest. The interest will be automatically

deducted from the loan at the time the money is released, and after one year will have

to pay the same amount as stated in the loan. Determine the interest actually charge to

him.

A vessel having a capacity of 0.05m3 contains a mixture of saturated water and saturated steam at a temperature of 245°C. The mass of the liquid present is 10kg. Find the following(i) The pressure, (ii) The mass, (iii) The specific volume, (iv) The specific enthalpy, (v)The specific entropy, and(vi) The specific internal energy

A golfer practices different parts of their game for hours. Specifically, the golfer practices: (1) putting, (2) their short game, and (3) their iron game. The amount of time spent on each part of their game is exponentially distributed. If the golfer is practicing their putting, they will always switch to their short game after an average of 30 minutes. When the golfer practices their short game, they do so for an average of 45 minutes, and then switches to putting with probability 0.6 or to their iron game with probability 0.4. When they practice their iron game, they do so for an average of 60 minutes. After practicing their iron game, the golfer will switch to putting or to their short game with equal probability.

A balanced-flow ERV is used to ventilate a warehouse at a rate of 1,000 L/s. The air conditions within the warehouse are quite cool and dry, Tab = 10°C and RH = 50%. At a particular moment, the outside air enters the ERV at Tab = 38°C and RH = 40%. During this time, the air conditions leaving the ERV on the exhaust side are measured to be Tab= 31°C and RH = 35%.