Mechanical Engineering Quiz # 17

In welding copper alloys with TIG arc welding

Direct current with reversed polarity is used

Direct current with straight polarity is used

Any one of these

Alternating current is used

In a four high rolling mill, there are four rolls out of which

One is working roll and three are backing up rolls

Two are working rolls and two are backing up rolls

Three are working rolls and one is backing up roll

All of the four are working rolls

The temperature of oxy-hydrogen flame is __________ oxy-acetylene flame.

Same as

More than

Less than

In average work, the tolerance produced by investment casting method is

+0.2 mm

+1 mm

+05 mm

±0.05 mm

The ferrous metals require more machining allowance than non-ferrous metals.

True

False

The blank diameter used in thread rolling will be

Equal to pitch diameter of the thread

Equal to minor diameter of the thread

A little larger than the pitch diameter of the thread

A little larger than the minor diameter of the thread

As entropy in a system increases, energy in the system _________.

Becomes less ordered

Becomes greater ordered

Greater the efficiency

Conservation of energy

Energy cannot be _______.

Transformed

Destroyed

Both

None of these

Internal energy undergoes changes when there are corresponding changes in _________.

Zero volume

Air temperature rises (or falls) as pressure increases (or decreases).

Temperature

-273°C, 0 K

Both increase

Suvs have higher _______________ and bumpers.

Stability

Brake

Headlights

Features

An internal analysis, the third step of the strategic management process helps identify ________.

Opportunities and threats

Resources and capabilities

Opportunities and possibilities

Values and philosophy

The production manager is responsible for all of the following except ________.

Setting schedules

Making buying decisions

Overseeing quality control

Preparing financial reports

Inborn or intrinsic reflexes are ________.

Always mediated by the brain

Involuntary, yet may be modified by learned behavior

Autonomic only

Rapid, predictable, and can be learned responses

The internal energy of a system is always increased by __________.

Adding heat to the system

Having the system do work on the surroundings

Withdrawing heat from the system

Adding heat to the system and having the system do work on the surroundings

A ____ is an electronic circuit

Voltage limiter

Current limiter

Short circuit

Voltage regulator

The thermodynamic processes that occur in nature ____________.

Convert thermal energy into mechanical energy

Lead to a more ordered state

Cannot be reversed

Do not conserve energy

Spontaneous reactions _____.

Always take place at a rapid rate

Are always exothermic

Always release free energy

Always result in increased disorder of the system

The entropy of an isolated system _________.

Always increases or remains constant.

Remains constant.

Either decreases or remains constant.

Always decreases

When the quantity q is greater than zero, __________ is added to the system.

Heat

Pressure

Both

None

When you click through to the end of a presentation, ________ displays.

Intro Slide

Blank Slide

Reference Slide

Any of these

The shear stress is a maximum where the velocity is __________.

Small

The same

Acceleration

One half

________ involves the use of computers to direct manufacturing processes.

Effective capacity

Process control

Productivity

Computer-aided manufacturing

δh for an endothermic process is ________ while δh for an exothermic process is ________.

Zero, positive

Zero, negative

Positive, negative

Negative, positive

A stone submerged in water displaces the _________.

Volume of water

Insects in water

Volume of the object

Volume of the fluid displace

A shorter electromagnetic wave is _____.

More powerful

Less powerful

Hotter

Colder

The process of ________ involves the movement or circulation of a mass or substance.

Convection

Conduction

Radiation

Reflection

The _____ law of thermodynamics states that not all energy is used because _____.

First; some of the energy disperses as heat

Second; some of the energy disperses as heat

First; some of the energy is destroyed

Second;some of the energy is destroyed

Air that is rapidly compressed undergoes _________.

Decrease in temperature;

Increase in volume;

Increase in temperature;

None of these

What is the units for capacity for cooling?

Liters

Gallons

Cubic meters

Tons

What is the capacity of a ton?

The registered capacity of a car's fuel tank

The weight of a ton

The mass of a ton of ore

The amount of force needed to lift a ton

The ability of a heating or cooling system to heat or cool a given amount of space