ESAS MODULE 4.2

100問 • 1年前

問題一覧

A manufacturing of the maintains one assembly line to produce signal generators. Weekly demand for the generators is 35 units, and the line operates for 7 h/d, 5 d/wk. What is the maximum production time per unit required of the line in order to meet demand?

1.00 h/unit

Tops corporation's gross margins is 45% of sales. Operating expenses such as sales and administration are 15% of sales. Tops is in a 405 tax bracket. What percent of sales is their profit after taxes?

18%

What is the acid test ratio?

the ratio of current assets (exclusive of inventory) to total current liabilities

Which of the following flow meters flow meters measure(s) the average fluid velocity rather than a point or local velocity in a pipe? I. venturi meter IV. Orifice meter II. pitot tube III. impact tube V. Hot-wire anemometer

I and IV

A circular cylinder 4m long and 3m in diameter is in an air stream. The flow velocity is 5 m/s perpendicular to the longitudinal axis of the cylinder. Given that the coefficient of drag on the cylinder is 1.3, and the density of air is 1.225 kg/m³, what is the most nearly the drag force on the cylinder?

0.24 kN

Approximately how much power is required to isothermally compress 23 m³/min of air from 101.5 kPa to 828.5 kPa?

82 kW

Which of the following statements is FALSE for an ideal gas?

the molecules behave as solld spheres of finite radius

The critical point for a mixture occurs for which of the following cases

the vapor and liquid exist in a aingle form

Which of the follwing is the result of the reaction given? 550+ 2KMnO4 + 2H₂O

2MnSO + K₂SO₄ + 2H₂SO₄

A substance is oxidized when which of the following occurs?

It loses electrons

In order to assign oxidation states in polyatomic molecules, which of the following rules is followed?

the oxidation od all elements in any allotropic form is zero

Ice with a volume of 50 cm³ and at a temperature of 0°C is added to 100g of water at 20°C. Assume that there is no spurious heat loss. The density of ice is 0.92 g/cm³, and the heat of fusion of ice is 1.44 kcal/mol at 0°C. Approximately how much ice is left unmelted after the mixture reaches thermal equilibrium?

23 cm³

A reaction rate is observed to triple as the result of raising the temperature from 0°C fo 20°C. What is most nearly the activation energy of the reaction? (R" is the universal gas constant.)

4400°R

in the troposphere, ozone is produced during the day and comsumed during the night. Determined the half-life of ozone if it is depleted to 10% of its initial value after 10 h of darkness.

3.0 h

Which one of the following is most likely to prove that a substance is inorganic?

the substance is heated together with copper oxide and the resulting gases are found to have no effect on limestone.

Which of the following organic chemicals is most soluble in water?

CH₂OH

In a crystal structure, what is an interstitial atom?

an extra atom sitting at a non-lattice point

Which of the following is a line defect in a lattice crystal structure?

Screw dislocation

Which of the following are true about Fick's first law for diffusion? I. It is only applicable to gases and liquids, not solids. II. the law states that the flux moves from high to low concentration. III. J, the flux, may be in units of cm³/cm²-s

II and III

Which of the following best describes the 0.2% offset yield stress?

it is the stress at which the materilas plastically strains 0.2%

Under condition of very slow deformation and hugh temperature it is possible to have plastic flow in a crystal at shear stresses lower than the cristical shear stress. what is this phenomenon called?

creep

To which of the follwong can the large discrepancy between the actual and theretical strengths of metal mainly be attributed?

dislocations

Which word combination best completes the following sentence? "Plastic deformation of a single crystal occurs either by _____or by _____ but ______is the more common method."

Slip; twinning; slip

Two cars, A and B, are traveling along the same route. Car A is traveling at 4.5 m/s and has a mass of 1150 kg. Car B is traveling at 6.7 m/s and has a mass of 1300 kg. If car B gently bumps in car A and their bumpers lock together, what will be their common velocity?

5.67 m/s

The locomotive of a freight train exerts a constant horizontal force of 6 tons on the train while drawing it at 50 mph on a level track. How many lb-ft of work are done at a distance of 1 mile?

6.34 x10 to the positive 7

A hoist powered by a 20-hp motor is used to raise a 500-kg bucket of concrete to height of 80 m. If the efficiency is 80 percent, find the time required.

38.2 sec

Steel rails 120 ft long are laid with their ends in contact on a day when the temperature is 110°F. What will be the gap between the rails on a day when the temperature is 20°F?

-1.25 inch

A cast iron that has been cooled quickly from moiten state.

White cast iron

What element that improves the strength and fatigue properties of copper?

Beryllium

To determine the chemical formula of a compound, we need to know all of the following EXCEPT the:

density of the compound

Which of the following properties of a metal is insensitive to the microstructure?

modulus of elasticity

What is the percentage of calcium oxide (CaO) in calcium carbonate (CaCO3)? take molecular weight Ca = 40.08, C = 12.01, and O = 16.00.

56.04%

What is the pH if the [H₂O) concentration is 0.003 M?

2.52

What is the molality of a solution which contains 20.0 gr of cane sugar C12H22O11. dissolved in 125 gr of water?

0.468 mol/kg

Cavitation in fluid mechanics refers to

The liquid to gaseous phase transition of a fluid due to low pressure

How does an adiabatic process compare to an isentropic process?

both : heat transfer = 0, isentropic - reversible

A Carnot cycle consists of the following which one is NOT?

Reversible constant heat addition

The electrons in an incomplete outer shell are called

Valence electrons

The isentropic (process) efficiency is used to compare actual device is such as turbines. compressors, nozzles, and diffusers to ideal ones. Which statement is true?

The inlet state and exit pressure are the same for both the ideal and actual device

Which of the following electromagnetic waves has the maximum frequency?

gamma rays

In a combustion chamber, fuel is burned to raise the temperature of the medium prior to production of work through an expansion process. The heat generated during the combustion reaction is the

Heat of reaction

The property that characterizes a material's ability to be drawn into a wire is its

Ductility

Most common fluids such as water, oil, gasoline and alcohol are classified as Newtonian fluid

True

If the dispersed phase is a liquid and the dispersion medium is solid, the colloid is a

gel

Aluminum hydroxide, Al(OH)3, is called an amphoteric hydroxide because:

it can react as either an acid or base

A substance which gives up protons to another substance are called

acid

. If the heat of a solution is negative, heat is given off when the solute dissolves in the solvent. What type of reaction is this?

Exothermic

A pressure cooker reduces cooking time because of the

Boiling point of water inside is elevated

An ideal gas is compressed isothermally. The enthalpy change is

zero

The area of the shear diagram of a beam between any two points on the beam is equal to:

Change in moment between the two points

A unit mass of steam is expanded in a ctlinder in such a manner that nl energy is added or lost as heat. This process is called a/ an

Adiabatic process

Which group contains processes that are always part of any physically realizable vapor power cycle?

Isobaric vaporization and isobaric condensation

Name the process that has no heat transfer.

Isentropic

In the periodic table of elements, which of the following element does NOT belong to group IIA?

Sodium

Which of the following cannot be determined by using the periodic chart alone?

The number of valence electrons in an element

Which type of hardening will work to some extent in all metais?

Work hardening

Which of the following phases of steel has a Face-Center Cubic structure?

austenite

What type of database stores all information in the equivalent of a matrix?

Relational

The seal of Professional Electrical Engineer bears the following. EXCEPT:

PTR (professional tax receipt) number

For dwelling units, the demand factor for the first 3000 Volt-Amp of load is

100%

What term is used to describe a polymer that has rubberlike properties?

Elastomer

are conductors used on high voltage transmission lines, when in order to reduce corona loss, it is desirable to increase the outside diameter without increasing the area beyond that needed for maximum line economy.

Hollow expanded

Elements which generally exhibits multiple oxidation state are

transition elements

What is a weak electrolyte?

A substance that partly ionized in a solution.

Heating of an ore to bring about its decomposition of a volatile product.

Calcination

The behavior of metals where the strength of a metal is increased and the ductility is decreased on heating at a relatively low temperature after cold working is

Astrain aging

What do you call the probability of finding an electron at any particular point in an atom?

Electron density

The most detrimental impurity in the magnetic materials is

Carbon

It is a phenomenon which occurs in conductors carrying currents whose intensity varies rapidly from instant to instant but does not occur with continuous currents.

Skin effect

Steel with 0.8% Carbon and 100% pearlite is called

Eutectiod

Which of the following group of elements ALL from crystal of the diamond structural lattice?

Carbon, Silicon, and Germanium

Materials that emit light in the absence of high heat and continue to emit light after the energy source has been removed are called

Phosphorescent

Select one that has the highest density?

Lead

The purpose of Manganese Sulfide in steel alloying is to increase

machinability

It is a soft weak metal having low ductility but possesses high resistance to corrosion.

Zinc

What do you call a polymer without additives and without blending with another polymer?

Homopolymers

In the periodic table of elements, which ONE of the following is light metal

Potassium

78. ?What is the softest structure found in the iron-carbon alloy system?

Ferrite

An Ang strom unit, commonly used for atomic and sub-atomic. distances is

10^-19 m

Heat is transferred at constant volume process to the Thermodynamics system of a fixed mass. The thermodynamics system will produce

Zero work

It is the property of absorbing moisture from atmosphere?

Porosity

The most common thermoset material is phenolformaldehyde also known as

Bakelite

All of the following statements about strain energy are correct, EXCEPT:

AIt is less for sites at grain boundaries that for internal sites within the crystal structure.

The electronic configuration, Is22s22p 3s²3p, is that of:

A halogen

The impurity atorms in a semiconductors

reduces the energy gap

A type of reaction has two compounds as reactants and two compounds as products

Double displacement

A thermistor has ______ temperature coefficient of resistance

a negative

At absolute zero temperature (0 K), all the valence electrons in an intrinsic semiconductor

are in the valence band

After counting 0, 1, 10, 11 what is the next binary number?

100

When a decimal point of a binary digit is moved 1 place to the right

multiplies by 2

It is a microscopic place of silicon that contains thousands of micro-miniature electronic circuit components mainly transistors.

microchip

Due to which of the following main reasons the digital computers use complemental subtraction?

It simplifies their circuitry

In getting an output from an XNOR gate, Its both inputs must be

at same logic level

What does "DCTL" means?

Direct Coupled Transistor Logic

When an input signal A = 10100 is applied to a NOT gate, its output signal will be

01011

The binary coding scheme most common used in microcomputers is called

ASCII

Which of the following takes the complete decimal number and represents it in binary?

Straight binary coding

A source program is a program written in

high levem language

Specifies a definite portion of ownership of the capital and assets of the corporation, all such being a like in value

Common stock

100

The first cost to be incurred if the piece of equipment now in place had been bought for a second hand dealer or some other business

In place Value

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premopremo remo · 75問 · 2年前

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