Practice Exams ChE - 11

1. If a man touches two metals w/c were kept together at room temperature, why would one metal feel colder than the other?
a. one has high heat transfer coefficient
b. one has a lower temperature
c. one has a high thermal conductivity
d. ???

2. What is the center of the circle defined by the equation x2 + y2 - 4x + 8y = 5?
a. (-2,4)
b. (2,-4)
c. ???
d. none of these

3. A 1-Newton load is applied at the midpoint of a rope attached to 2 posts. If the load caused the rope to sag, the rope can be brought back to the initial position if
a. the tension on the rope is increased by 1 Newton
b. this is not possible
c. the tension on the rope is increased by 2 Newton’s
d. the tension on the rope is increased by 3 Newton’s

4. An unbiased coin is tossed 6 times. What is the probability of getting exactly 3 heads?
a. ???
b. ???
c. none of these
d. 5/16

5. A expects to be paid P6 per month for every P5 borrowed. What is the effective annual interest?
a. none of these
b. 240%
c. 79.2%
d. 792%

Read more...

Practice Exams ChE - 10

1. Which of the following is considered a start-up cost?
a. expense of training sales representatives
b. expenses of training plant personnel even if insured before start-up
c. costs associated with starting a new company
d. Profit loss due to timing

2. All are methods for evaluating inventory except
a. LIFO
b. net present value
c. FIFO
d. market value

3. Which is not considered a variable operating cost?
a. administrative cost
b. cost of scrap
c. none of the above

4. What is the length of the base of a triangle whose area is 1/3 and height is 4/5?

6. The force exerted in dragging a marble block 1 ft-square and 1/2 ft thick is
a. least when it is dragged from one of the edges
b. least when it is dragged vertically (1/2 ft-thick surface on the floor)
c. same regardless of which face is on the floor
d.

7. A plane is moving horizontally at a speed of 120 kph dropped two bombs at a 2-sec. interval. What is the position of the second bomb from the first at the time of impact of the first to ground?
a. 117 m horizontally ahead of the first bomb
b. 117 m horizontally behind the first bomb
c. directly above the first bomb
d.

8. Sound wave does not travel in
a. hot air
b. compressed air
c. soft
d. vacuum

9. Two sound waves produce a beat if they have
a. same frequency
b. slightly different frequencies
c. same amplitudes
d. slightly different amplitudes

10. This law states that the current through a metal conductor is proportional to the potential difference between its ends.
a. Ohm’s Law
b. Kirchoff’s Second Law
c. Kirchoff’s First Law
d. Coulombs Law

Read more...

Practice Exams ChE - 9

1. A deposits P1000 per month in a bank giving 6% interest compounded monthly for 2 years. He stopped making deposits and withdrawals for 5 years. What is the amount of money in the bank after 7 years?
a. 34,304
b. 50,2xx
c. ???
d. none of these

2. A balloon moves vertically at 50 kph in still air. What is the velocity of the balloon in air moving horizontally at 40 kph?
a. 90 kph
b. 65 kph
c. 40 kph
d. none of these

3. What force is needed to move a block weighing 100 kg if the coefficient of friction is 0.3?
a. 294 N
b. ???
c. ???
d. none of these

4. A 3-g bullet moving at 3 km/s hits a 4 kg lump of clay. What is the final velocity of the composite?
a. 2.2 m/s
b. ???
c. ???
d.none of these

5. The resultant of force A(8 lb) and force B(13 lb) is 5 lb. What is the angle between A and B?
a. 0 deg
b. 180 deg
c. 90 deg
d. 45 deg

6. The elastic limit of a rod is 2.6 x 104 lb/in2. What is the weight of a load that a 2-inch rod can carry within this elastic limit?
a. 8.16 x 104 lb
b. ???
c. ???
d. ???

7. Project A costs 5.5 M while Project B costs 8.5 M. If the projects have earnings of 1.8 M and 2.4 M respectively for ten years, which of the projects is viable at a MARR of 25%?
a. A only
b. Both A & B
c. B only
d. none of these

8. Which of the following is a more modern measure of profitability?
a. capital cost
b. cash flow
c. profit
d. sales volume

9. In choosing between 2 alternative equipment, which of the following is not considered?
a. operating cost
b. machine reliability
c. none of the above

10. Which of the following is not considered a long-term debt?
a. debentures
b. bonds
c. retained earnings
d.mortgage

Read more...

Practice Exams ChE - 8

1. Find the volume of the curves y=x2 and y=1 rotated around the y-axis
a. 2 pi
b. pi/2
c. pi
d. none of these

2. Find the lim......t²- 4
.................t->3....2t+4
a. 1/2
b. ???
c. ???
d. none of these

3 Evaluate: F(x)dx - G(x)dx
a. [F(x)+G(x)] dx
b. 2F(x)dx
c. [F(x)+G(x)] dx
d. ???

4. What is the relative maximum of y = 3x^3 + 4x + 7?
a. 0
b. 7/4
c. does not exist
d. 2/3

5. The distance of a body from its initial position is given by s=t²+10t. If the body has moved 39 meters from the initial position, find the time elapsed.
a. 9
b. ???
c. ???
d. none of these

6. A box contains 3 white, 7 blue, 2 red, and 9 green balls. What is the probability getting either white or green?
a. 4/7
b. ???
c. ???
d. none of these

7. Two cars leave the same point at 9 am. One car headed west at 60 kph while the other car headed south at 80 kph. What is the distance between the two cars at 10 am of the same day?
a. 80km
b. 100km
c. ???
d. none of these

8. Two cars of equal weight moving at the same direction collided. What is the final velocity of the wreckage if one car travels at 100kph and the other at 80kph?
a. 80
b. 180
c. 90
d. none of these

9. Two cars A & B are moving in opposite direction at a velocity of 100kph and 80 kph respectively. What is the final velocity of the wreckage when the cars collided head-on?
a. 10kph at the direction of A
b. 20 kph at the direction of A
c. 20 kph at the direction of B
d. 10 kph at the direction of B

10. What fraction of an iceberg is immersed in sea-water?
Hint: density of iceberg=0.92 g/cc
density of sea-water=1.03 g/cc
a. ???
b. 11%
c. ???
d. none of these

Read more...

Practice Exams ChE - 7

1. The probability of getting heads or tails in an unbiased toss coin is 1/2. If a coin is tossed 2 times, what is the probability of getting 2 consecutive heads?
a. 1/2
b. ???
c. 1/4
d. none of these

2. The probability of getting heads or tails in an unbiased toss coin is 1/2. If a coin is tossed thrice what is the probability of getting a tail on the third toss?
a. 1/8
b. ???
c. 1/2
d. none of these

3. The probability of a couple having a child with curly hair is 1/4, with thick lips is 1/3 and with both characteristics, 1/6. What is the probability of having two consecutive children with curly hair and thick lips if the two events are mutually exclusive?
a. 1/6
b. 25/144
c. ???
d. none of these

4. The probability that a good component is obtained from a sample is:
No. of good components in sample - probability
0 - 1/35
1 - 10/35
2 - 20/35
3 - 4/35

If a sample of 3 is taken infinite times, what is the average no. of good components in the sample?
a. 1.5
b. 1.77
c. 2.0
d. none of these

5. A box contains 5 red, 3 green, 2 white balls. What is the probability of not getting a white ball?
a. 0.2
b. ???
c. 0.8
d. none of these

6. Solve the differential equation:
dy = x^3 + 2x + 10
dx

7. Find dy for y = x
...........dx...........x-1

8. Given F(x) = x+1 find dy
....................................dx

9. Evaluate: 6x (x + 2x²) dx

10. Find dy given y= (y-7)
..............dx...............(y+2)

Read more...