Description : The violent noises heard in an engine during the process of combustion after the position has passed over the top dead center is known as? 1. Stationary 2. Spark ignition 3. Detonation 4. all of these
Last Answer : <!-- [endif] -->ans 3
Description : Which of the following types of internal combustion engine is generally used as portable engine for pumping and electricity generation? 1. Spark ignition 2. Stationary 3. Vertical single cylinder 3. all of these
Last Answer : ans 2
Description : Which of the following statement is incorrect? A. The liquid fuels consist of hydrocarbons. B. The liquid fuels have higher calorific value than solid fuels. C. The solid fuels have higher calorific value than liquid fuels. D. A good fuel should have low ignition point.
Last Answer : Answer: C
Description : Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle A. combustion is at constant volume B. expansion and compression are isentropic C. maximum temperature is higher D. heat rejection is lower
Last Answer : Answer: D
Description : Identical objects of four different materials are heated to the same high temperature. Which of the following would least likely burn your hand if touched? a. aluminium b. brass c. glass d. concrete
Last Answer : glass
Description : What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure? a. Subcooled liquid b. Saturated liquid c. Pure liquid d. Compressed liquid
Last Answer : Subcooled liquid
Description : What refers to the heat needed to change the temperature of the substances without changing its phases? a. Latent heat b. Sensible heat c. Specific heat d. entropy
Last Answer : Sensible heat
Description : The “equation of state” refers to any equation that relates the ______ of the substance. A. Pressure and temperature B. Pressure, temperature and specific weight C. Temperature and specific weight D. Pressure, temperature and specific volume
Last Answer : Pressure, temperature and specific volume
Description : What refers to the pressure at which a pure substance changes phase at a given temperature? A. Equilibrium pressure B. Saturation pressure C. Superheated pressure D. Subcooled pressure
Last Answer : Saturation pressure
Description : What refers to the temperature at which a pure substance changes phase at a given pressure? A. Equilibrium temperature B. Saturation temperature C. Superheated temperature D. Subcooled temperature
Last Answer : Saturation temperature
Description : What refers to the amount of heat needed to raise the temperature of an object by one degree Celsius or 1K? A. Heat capacity B. Specific heat C. Latent heat D. Molar heat
Last Answer : Heat capacity
Description : Which of the following best describes both Stirling and Ericson engines? a. Internal combustion engine b. External combustion engine c. Diesel cycle d. Rankine cycle
Last Answer : External combustion engine
Description : Heat engine deriving its power from the energy liberated by the explosion of a mixture of some hydrocarbon, in a gaseous or vaporized form. a. Dual Combustion Engine b. Internal Combustion Engine c. External Combustion Engine d. None of the above
Last Answer : Internal Combustion Engine
Description : What is defined as the ratio of the net electrical power output to the rate of fuel energy input? A. Combustion efficiency B. Thermal efficiency C. Overall efficiency D. Furnace efficiency
Last Answer : Overall efficiency
Description : What is the ratio of the useful heat extracted to heating value? A. Combustion efficiency B. Phase efficiency C. Heat efficiency D. Work efficiency
Last Answer : Combustion efficiency
Description : The efficiency of a dual combustion cycle __________ upon cut-off ratio. A. depends B. does not depend
Last Answer : Answer: A
Description : Producer gas is obtained by A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast B. carbonisation of bituminous coal C. passing steam over incandescent coke D. passing air and a large amount of steam over waste coal at about 650°C
Description : The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes. A. Agree B. Disagree
Description : For spark ignition engine, the equivalence ratio of mixture entering the combustion chamber has values (A) for idling and for peak power conditions (B) for both idling and peak power conditions (C) for idling and for peak power conditions (D) for both idling and peak power conditions
Last Answer : ANSWER (B) for both idling and peak power conditions
Description : Carnot cycle efficiency is maximum when (a) initial temperature is 0°K (b) final temperature is 0°K (c) difference between initial and final temperature is 0°K (d) final temperature is 0°C (e) initial temperature is minimum possible.
Last Answer : Answer : b
Description : For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be (a) zero (b) minimum (d) maximum (d) infinity (e) there is no such criterion.
Last Answer : Answer : a
Description : A control volume refers to what? a. A fixed region in space b. A reversible process c. an isolated system d. a specified mass
Last Answer : A fixed region in space
Description : What refers to a system in which there is a flow of mass across its boundaries? a. Open system b. Closed system c. Isolated system d. Non-flow system
Last Answer : Open system
Description : What refers to the series of states through which a system passes during the process? a. path b. quasi- static steps c. reversibility moves d. irreversibility moves
Last Answer : path
Description : What refers to the state at which liquid and gaseous phases are indistinguishable? a. Triple point b. Critical point c. Boiling point d. Pour point
Last Answer : Critical point
Description : What refers to the thermodynamic properties which are independent on the amount of the substance present? a. Extensive property b. Intensive properties c. Reversible properties d. Irreversible properties
Last Answer : Intensive properties
Description : What refers to the thermodynamic properties which are dependent on the amount of the substance present? a. Extensive property b. Intensive properties c. Reversible properties d. Irreversible properties
Last Answer : Extensive property
Description : A Thermodynamic Term That refers to any fixed region in a space a. Control Volume b. Volume c. Density d. Natural Gas
Last Answer : Control Volume
Description : The compressibility factor, x, is used for predicting the behavior of nonideal gases. How is the compressibility ty factor defined relative to an ideal gas? (subscript c refers to critical value) A. ... compressibility factor, x, is an dimensionless constant given by pV=zRT. Therefore z = pV / RT
Last Answer : z = pV/ RT
Description : What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed? A. Cost efficiency rating B. Energy efficiency rating C. Coefficient of performance D. Cost of performance
Last Answer : Energy efficiency rating
Description : What refers to the rate of thermal radiation emitter per unit area of a body? A. Thermal conductivity B. Absorptivity C. Emissivity D. Emissive power
Last Answer : Emissive power
Description : What refers to the heating of the earth’s atmosphere not caused by direct sunlight but by infrared light radiated by the surface and absorbed mainly by atmospheric carbon dioxide? A. Greenhouse effect B. Global warming C. Thermal rise effect D. Ozone effect
Last Answer : Greenhouse effect
Description : What refers to the transfer of energy between a solid surface and the adjacent fluid that is in motion? A. Conduction B. Convection C. Radiation D. Electrification
Last Answer : Convection
Description : What refers to the point at which the saturated liquid and saturated vapor states are the same or identical? A. Triple point B. Inflection point C. Maximum point D. Critical point
Last Answer : Maximum point
Description : What refers to the amount of energy absorbed or released during a phase-change process? A. Molar heat B. Latent heat C. Vaporization heat D. Condensation heat
Last Answer : Latent heat
Description : What refers to the measure of the disorder present in a given substance or system? A. Enthalpy B. Entropy C. Heat capacity D. Molar heat
Last Answer : Entropy
Description : What refers to the strong repulsion between the positively charged nuclei which makes fusion reaction difficult to attain? A. Atomic repulsion B. Nuclear repulsion C. Coulomb repulsion D. Charge repulsion
Last Answer : Coulomb repulsion
Description : What refers to the portion of the internal energy of a system associated with the kinetic energies of the molecules? A. Translational energy B. Spin energy C. Rotational kinetic energy D. Sensible energy
Last Answer : Sensible energy
Description : What form of energy refers to those a system possesses as a whole with respect to some outside reference frame, such as potential and kinetic energies? A. Macroscopic form of energy B. Microscopic form of energy C. Internal energy D. External energy
Last Answer : Macroscopic form of energy
Description : What refers to the series of state through which a system passes during a process? A. Path B. Phase C. Cycle D. Direction
Last Answer : Path
Description : What refers to any change that a system undergoes from one equilibrium state to another equilibrium state? A. Process B. Path C. Phase D. Cycle
Last Answer : Process
Description : Which of the following gas has a minimum molecular mass? A. Oxygen B. Nitrogen C. Hydrogen D. Methane
Description : Workdone in a free expansion process is A.zero B.minimum C.maximum D.positive
Description : Which of the following has the minimum atomic mass? A.Oxygen B.Sulphur C.Nitrogen D.Carbon
Description : For reversible adiabatic process, change in entropy is (a) maximum (b) minimum (c) zero (d) unpredictable (e) negative
Last Answer : Answer : c
Description : Minimum work in compressor is possible when the value of adiabatic index n is equal to (a) 0.75 (b) 1 (c) 1.27 (d) 1.35 (e) 2.
Description : For which of the following substances, the gas laws can be used with minimum error (a) dry steam (b) wet steam (c) saturated steam (d) superheated steam (e) steam at atmospheric pressure.
Last Answer : Answer : d
Description : Work done in a free expansion process is (a) + ve (b) -ve (c) zero (d) maximum (e) minimum.
Description : In a battery ignition system, the intensity of spark is A. minimum at low engine speed B. minimum at low engine speed and increases with engine speed C. maximum al low engine speed and decreases with engine speed D. maximum at low engine speed
Last Answer : ANSWER : C