Elements_01

Jacky Shane Luyas Buhia · 20問 · 2年前

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In a four stroke Diesel engine, drawing air into the cylinder is what stroke ?

a. First Stroke

Increasing the total amount of changing air in the working cylinder of the engine.

b. Supercharging

Rings located in the grooves of the piston usually near the top and near the bottom

b. Piston Ring

The portion of the piston which extends below the piston pin and serves as a guide for the piston and connecting rod.

a. Piston Skirt

An engine in which the fuel is burned directly within the working cylinder.

a. Internal Combustion Engine

What type of gas turbine is used in aircraft?

a. Open cycle type

Which of the following compressors is generally used for gas turbines ?

c. Axial Flow Type

Overall efficiency of a gas turbine is _______.

c. Less than Diesel efficiency

Which curve represents the average of daily load curves over a one-month period and is used for rate establishment?

c. Monthly Load Curve

What is the " Maximum Demand " often referred to as ?

b. Peak Load

What is the purpose of a Load-Duration Curve ?

b. To rearrange data from a chronological load curve

What does " Demand Factor " measure ?

a. The ratio of connected load to maximum demand

What is the " Diversity Factor " in electrical systems ?

c. The ratio of individual maximum demands to simultaneous maximum demand.

What is " Base Load " in the context of electrical systems ?

b. The minimum load over a given period

A simultaneous generation of electricity and steam (or heat) in a single power plant:

D. Cogeneration

What is the clockwork-operated device which records continuously the humidity of the atmosphere?

D. Hygrograph

A Francis turbine has what flow:

A. Inward flow reaction

A type of water turbine:

C. Pelton

If the pressure of the confined gas is constant, the volume is directly proportional to the absolute temperature:

B. Joule

Pump used to increase air pressure above normal, air is then used as a motive power:

B. Air compressor

The locus of elevations:

B. Hydraulic gradient

The dividing point between the high pressure and low pressure sides of the refrigeration cycle occurs at the:

A. Expansion valve

Type of turbine that has high pressure and low pressure is called:

D. Compound turbine

Heat exchanger used to provide heat transfer between the exhaust gases and the air prior to its entrance to the combustor.

C. Regenerator

S.I unit of force:

B. Newton

Heat transfer due to density differential:

A. Convection

If the fluid travels parallel to the adjacent layers and paths of individual particles do not cross, the flow is said to be:

D. Laminar

At any instant, the number of particles passing every cross-section of the stream is the same, the flow is said to be:

A. Steady flow

The intake pipe to a hydraulic turbine from a dam is:

D. Penstock

Scavenging efficiency of a four stroke diesel engine is:

D. Between 95 % and 100 %

Flash point of liquids is the temperature at which:

A. The fuel emits vapors at a rate which produces an inflammable mixture with air

Flash point for diesel fuel oil should be:

A. Maximum 49°C

Air standard efficiency of a diesel engine depends on:

B. Compression ratio

What amount of air is required in a low bypass factor?

B. Lesser

The term "exposure" in radiological effects is used as a measure of a Gamma ray or an X-ray field in the surface of an exposed object. Since this radiation produces ionization of the air surrounding the object, the exposure is obtained as:

A. x = no. of ions produced per mass of air x per coulombs per kg

The design of an air supply duct of an air conditioning system:

D. Affects the distribution of air

The energy of fluid flowing at any section in a pipeline is a function of:

C. Height above a chosen datum, density, internal energy, pressure and velocity od flow

Ignition of the air fuel mixture in the intake of the exhaust manifold:

B. Backfire

A theoretical body which when heated to incandescence would emit a continuous light-ray spectrum:

B. Black body

The ratio of the average load to the peak load over a designated period of time is called:

A. Load factor

The ratio of the sum of individual maximum demands of the system to the overall maximum demand of the whole system:

A. Demand factor

Heavy water is:

D. D₂O

The hydraulic formula CA is use to find:

A. Quantity of discharge through an orifice

If the temperature is held constant and the pressure is increased beyond the saturation pressure, we have a:

C. Compressed liquid

Which of the following a set of standard condition:

B. 101.325, 273⁰k, 22.4 m³/kg mole

In sensible cooling process, the moisture content:

A. Does not change

The internal combustion engines never work on________ cycle:

A. Rankine

The locus of elevation to which water will rise in the piezometer tube is termed:

C. Hydraulic gradient

When four events takes place in one revolution of a crankshaft of an engine, the engine is called:

C. Two stroke engine

Which of the following does not belong to the group?

C. Time injection system

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