Practice Exams ChE - 22

1. Find the equation of the line passing through (-1,2) and (3,5).
a. 2x - 5y - 12 = 0
b. x + y = 7
c. 3x - 11 = 2y
d. 3x - 4y + 11 = 0
e. 3x - 4y - 11 = 0

2. The square of the sum of two positive numbers is 45 and their product is 6. the sum of their squares is?
a. 44
b. 33
c. 22
d. 55
e. none of the above

3. You have been offered a credit card by an oil company that charges interest at 1.8% / month compounded monthly. What is the effective annual interest rate that this oil company charges?
a. 21.6 %
b. 23.87 %
c. 22.34 %
d. 18 %
e. none of the above

4. A machine purchased for P45,000 had a depreciable life for 4 years. It will have n expected salvage value of P5,000 at the end of the depreciable life. Using the straight line method, what is the book value at the end year 2?
a. 27,500
b. 35,000
c. 20,000
d. 25,000
e. none of the above

5. A 100 ohm resistor, a 0.0001F capacitor and a 0.1H inductor are connected in series to a 120-V rms generator. If the generator frequency is 60Hz, find the impedance and effective current.
a. 101 ohm, 1.19 A
b. 105 ohm, 1.5 A
c. 111 ohm, 1.8 A
d. 116 ohm, 2.15 A
e. none of the above

6. The major and minor axis of an ellipse measures 10 and 8 units respectively. The distance between the foci is
a. 3
b. 6
c. 5
d. 7
e. none of the above

7. When 0.0019448 is corrected to 3 significant figures, it becomes
a. 0.00190
b. 0.002
c. 0.00194
d. 0.00195
e. none of the above

8. How many sides has a polygon if the sum of interior angles is 2520??
a. 12
b. 15
c. 16
d. 14
e. none of the above

9. It is a stress that acts tangent to the surface of the cylinder.
a. longitudinal stress
b. bearing stress
c. tangential stress
d. shearing stress
e. none of the above

10. Mixtures of oxygen and helium can be tolerated by divers. What proportion should oxygen be if the diver works 5.0 m below the surface and the partial pressure of oxygen should be 0.30 atm?
a. 5.12 %
b. 4.88 %
c. 6.00 %
d. 5.86 %
e. none of the above