ESAS FEB 2020 and APRIL 2021

Question 1

8. A woman stands on a bathroom scale in an elevator that is not moving. The scale reads 450 N. The elevator moves downward at a constant velocity of 4.5 m/s. What does the scale read while the elevator descends with constant velocity?
   A. 100 N B. 250 N C. 450 N

Answer 1

C. 450 N

Question 2

10. A gas expands at a constant pressure of 600 kPa. During the wexpansion 54 kJ are work done by the gas. If T1 = 290 K and V1 = 0.01 cu. m., find the final temperature of the gas.
    A. 3500 K B. 2600 K C. 2900 K

Answer 2

C. 2900 K

Question 3

21. A 5-kg rifle fires a 20-g bullet with a velocity of 250 m/s. What is the recoil velocity of the rifle?
    A. 1.67 m/s B. 1.76 m/s C. 2.98 m/s

Answer 3

A. 1.67 m/s

Question 4

31. A price tag of P1450 is paid in 70 days, but if paid within 35 days it will have a 5 percent discount. Find the rate of interest.
    A. 52.3 percent B. 69.20 percent C. 54.13 percent

Answer 4

C. 54.13 percent

Question 5

39. A cubical copper block is 1.50 cm on each edge submerged in oil for which ρ = 820 kg/cu. m. What is the tension on the string that is supporting the block when submerged? ρCu = 8920 kg/cu.m.
    A. 0.268 N B. 0.789 N

Answer 5

A. 0.268 N

Question 6

48. The section modulus, in cm3, about the central axis of a 10-cm x 25-cm beam on edge is closest to
    A. 250 B. 1,000

Answer 6

B. 1,000

Question 7

53. The volatility, β, of a stock is found to be 1.5 times the stock market average. If the risk premium for buying stocks averages 8.3 percent and the present treasury bill rate (assumed to be risk free) is 7 percent, what is most nearly the expected return (ER) on the stock?
    A. 12.5 percent B. 15.3 percent C. 18.9 percent D. 19.5 percent

Answer 7

D. 19.5 percent

Question 8

57. What is the speed of the proton so that its mass will be twice its rest mass?
    A. 0.866c B. 0.987c

Answer 8

A. 0.866c

Question 9

62. Steam at 416 Pa and 166 K has a specific volume of 0.41 m3/kg and a specific enthalpy of 29.4 kJ/kg. Find the internal energy per kilogram of steam.
    A. 28.5 kJ/kg B. 29.2 kJ/kg

Answer 9

B. 29.2 kJ/kg

Question 10

64. The valve between a 9 L tank containing gas at 5 atm and a 6 L tank containing gas at 10 atm is opened. What is the equilibrium pressure obtained in the two tanks at constant temperature? Assume ideal gas behaviour.
    A. 5 atm B. 6 atm C. 7 atm

Answer 10

C. 7 atm

Question 11

74.	A 14 cm inner diameter (i.d.) water main furnishes water (through intermediate pipes) to a 1.00 cm i.d. faucet pipes. If the average speed in the faucet pipe is 3.0 cm/s, what will be the average speed it causes in the water main?
A. 0.10 cm/s	
B. 0.15 cm/s	
C. 0.010 cm/s	
D. 0.015 cm/s

Answer 11

D. 0.015 cm/s

Question 12

87.	A hoist with a 100-hp engine is capable of lifting a 10,000 lb load and a height of 20 ft in 10 sec. What is the efficiency of this machine?
A. 42.8 percent	
B. 24.8 percent	
C, 34.6 percent	
D. 36.4 percent

Answer 12

D. 36.4 percent

Question 13

89. A mass of oxygen occupies 0.0200 m3 at atmospheric pressure, 101 kPa and 5.0°C. Determine its volume if its pressure is increased to 108 kPa while its temperature is changed to 30°C.
    A. 0.0306 m3
    B. 0.306 m3
    C. 0.0204 m3

Answer 13

C. 0.0204 m3

Question 14

99. A 100-cm3 beaker made of pyrex glass (α = 3.2 x 10−6/°C) is filled to the brim with water at 12°C. What volume of water will overflow when the temperature is raised to 60°C?
    A. 0.036 cm3
    B. 0.063 cm3
    C. 0.046 cm3

Answer 14

C. 0.046 cm3

Question 15

Cost of constructing road, cost of perpertual

Answer 15

1.32 M

Question 16

A square bar of aluminum 2 in, find volume of the bae

Answer 16

40. 0135 cu. in.

Question 17

Hot water at 100 deg C

Answer 17

200 g

Question 18

Engineering economy: charges one and one half percent per month, find nominal annual interest rate

Answer 18

18 %

Question 19

A person throws a stone upward at an angle of 30 degrees. Determine the time of flight

Answer 19

2. 563 sec

Question 20

Water flows at 6 ft/s through a pipe 500 ft long

Answer 20

5 psig

Question 21

A person sits on a chair 3m from the wall on which hangs a plane mirror, if the person wants to see the whole height of the woman 3m from his back, what is the minimum height of mirror that will enable him to see that reflection?

Answer 21

0.533 m

Question 22

If 9.05 moles of ozone is formed in a storm, then the mass of ozone is

Answer 22

434.4 g

Question 23

Volume of flow rate in L/s given hydraulic efficieny is 75 %

Answer 23

4,285

Question 24

One end of a 50 ft rope is attached to an automobile . What is the force exerted on the automobile

Answer 24

625 lbs

Question 25

Calculate the mass of water required to prepare a 4 m aqueous solution of NH3 using 25 g of NH3

Answer 25

0.368 kg

Question 26

Two particles moving in the same direction collide . The energy of the system after the collision is mostly

Answer 26

30 J

Question 27

What is true for polytrophic exponent n, for a perfect gas undergoing an isobaric process

Answer 27

n = 0

Question 28

printer that use sensitive black powder

Answer 28

laser printer

Question 29

mole fraction of alcohol is 0.1. Calculate it molality

Answer 29

6.17

Question 30

A single bolt is used to lap two joint steel bars together. Determine diameter of bolt

Answer 30

19 mm