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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4251. |
To obtain integrated form of Clausius-Clayperon equation, , from the exact Clayperon equafion, it is assumed that the |
| A. | volume of the liquid phase is negligible compared to that of vapour phase. |
| B. | vapour phase behaves as an ideal gas. |
| C. | heat of vaporisation is independent of temperature. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 4252. |
In case of an __________ process, the temperature of the system increases. |
| A. | isothermal compression |
| B. | isothermal expansion |
| C. | adiabatic expansion |
| D. | adiabatic compression |
| Answer» E. | |
| 4253. |
The standard state of a gas (at a given temperature) is the state in which fugacity is equal to |
| A. | unity |
| B. | activity |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 4254. |
Cp of a gas at its critical temperature and pressure |
| A. | becomes zero. |
| B. | becomes infinity. |
| C. | equals 1 kcal/kmol K. |
| D. | equals 0.24 kcal/kmol K. |
| Answer» C. equals 1 kcal/kmol K. | |
| 4255. |
The third law of thermodynamics states that the |
| A. | heat capacity of a crystalline solid is zero at absolute zero temperature. |
| B. | heat transfer from low temperature to high temperature source is not possible without external work. |
| C. | gases having same reduced properties behave similarly. |
| D. | none of these. |
| Answer» B. heat transfer from low temperature to high temperature source is not possible without external work. | |
| 4256. |
Consider the reaction, C + O2 CO2 ; H = - 94 kcal. What will be the value of H for the reaction CO2 C + O2 ? |
| A. | -94 kcal |
| B. | + 94 kcal |
| C. | > 94 kcal |
| D. | < -94 kcal |
| Answer» C. > 94 kcal | |
| 4257. |
Degree of freedom of the system ice-water-vapour will be |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» B. 1 | |
| 4258. |
A system in which there is exchange of energy but not of mass, is called a/an __________ system. |
| A. | isolated |
| B. | open |
| C. | insulated |
| D. | closed |
| Answer» E. | |
| 4259. |
The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point. |
| A. | freezing |
| B. | triple |
| C. | boiling |
| D. | Boyle |
| Answer» C. boiling | |
| 4260. |
In an ideal gas mixture, fugacity of a species is equal to its |
| A. | vapor pressure |
| B. | partial pressure |
| C. | chemical potential |
| D. | none of these |
| Answer» C. chemical potential | |
| 4261. |
Joule-Thomson co-efficient is defined as |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/393-37-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/393-37-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/393-37-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/393-37-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/393-37-3.png"> | |
| 4262. |
In the reaction, C + O2 CO2 ; H = - 94 kcal. What is the heat content (enthalpy)of O2? |
| A. | -94 kcal |
| B. | > -94 kcal |
| C. | < - 94 kcal |
| D. | zero |
| Answer» E. | |
| 4263. |
For a constant volume process __________ by the system is used only to increase the internal energy. |
| A. | heat absorbed |
| B. | work done |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» B. work done | |
| 4264. |
When a system is in equilibrium for all possible processes, the differential or finite change of entropy is |
| A. | < 0 |
| B. | > 0 |
| C. | = 0 |
| D. | none of these |
| Answer» B. > 0 | |
| 4265. |
A system is said to be at equilibrium, if the entropy of the system has reached __________ value. |
| A. | minimum |
| B. | zero |
| C. | maximum |
| D. | none of these |
| Answer» D. none of these | |
| 4266. |
In the equation, PVn = constant, if the value of n = , then it represents a reversible __________ process. |
| A. | adiabatic |
| B. | isometric |
| C. | isentropic |
| D. | isothermal |
| Answer» C. isentropic | |
| 4267. |
The variation of heat of reaction with temperature at constant pressure is given by the __________ law. |
| A. | Kelvin's |
| B. | Antonie's |
| C. | Kirchoffs |
| D. | none of these |
| Answer» D. none of these | |
| 4268. |
At absolute zero temperature, the __________ of the gas is zero. |
| A. | pressure |
| B. | volume |
| C. | mass |
| D. | none of these |
| Answer» C. mass | |
| 4269. |
Which of the following equations is used for the prediction of activity co-efficient from experiments ? |
| A. | Van Laar equation |
| B. | Margules equation |
| C. | Wilson's equation |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4270. |
The equation, , applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation. |
| A. | Van Laar |
| B. | Margules |
| C. | Gibbs-Duhem |
| D. | Gibbs-Duhem-Margules |
| Answer» E. | |
| 4271. |
Entropy of a substance remains constant during a/an __________ change. |
| A. | reversible isothermal |
| B. | irreversible isothermal |
| C. | reversible adiabatic |
| D. | none of these |
| Answer» D. none of these | |
| 4272. |
If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than H for the reaction CH4(g) + C2H4(g) C3H8(g) will be __________ Kcal. |
| A. | -19.4 |
| B. | -30.2 |
| C. | 55.2 |
| D. | -55.2 |
| Answer» B. -30.2 | |
| 4273. |
Which of the following valves will incur maximum pressure drop for the same discharge of water ? |
| A. | Globe valve |
| B. | Gate valve |
| C. | Needle valve |
| D. | Butterfly valve |
| Answer» D. Butterfly valve | |
| 4274. |
Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor. |
| A. | less than |
| B. | more than |
| C. | same as |
| D. | none of these |
| Answer» C. same as | |
| 4275. |
In deriving Bernoulli's equation, fluid is assumed to be |
| A. | incompressible, frictionless, steady, along a streamline. |
| B. | uniform, steady, incompressible, along a streamline. |
| C. | steady, density being pressure dependent, frictionless. |
| D. | none of these. |
| Answer» B. uniform, steady, incompressible, along a streamline. | |
| 4276. |
Major loss in sudden contraction in pipe flow is due to |
| A. | boundary friction. |
| B. | flow contraction. |
| C. | expansion of flow after sudden contraction. |
| D. | none of these. |
| Answer» C. expansion of flow after sudden contraction. | |
| 4277. |
Which of the following can be used to create a flow of gas, where no significant compression is required ? |
| A. | Reciprocating compressor |
| B. | Blower |
| C. | Axial flow compressor |
| D. | Centrifugal compressor |
| Answer» C. Axial flow compressor | |
| 4278. |
A free jet of water of cross-sectional area 0.01m2 and a velocity of 20 m/s strikes a plate and then flows in a plane parallel to the plate as shown in the figure below. The horizontal component of the force on the support is |
| A. | 200 N |
| B. | 400 N |
| C. | 2000 N |
| D. | 4000 N |
| Answer» E. | |
| 4279. |
Cp/Cv is termed as |
| A. | adiabatic constant |
| B. | Mach number |
| C. | Weber number |
| D. | Prandtl number |
| Answer» B. Mach number | |
| 4280. |
Viscosity of a liquid decreases __________ with rise in temperature. |
| A. | exponentially |
| B. | linearly |
| C. | logarithmically |
| D. | none of these |
| Answer» D. none of these | |
| 4281. |
Discharge in laminar flow through a pipe varies |
| A. | as the square of the radius. |
| B. | inversely as the pressure drop. |
| C. | inversely as the viscosity. |
| D. | as the square of the diameter. |
| Answer» B. inversely as the pressure drop. | |
| 4282. |
The lift of a ballon is |
| A. | increased, as it rises to a higher altitude. |
| B. | due to the weight of the atmospheric air, that it displaces. |
| C. | not dependent on the temperature of the atmosphere. |
| D. | none of these. |
| Answer» C. not dependent on the temperature of the atmosphere. | |
| 4283. |
In which of the following body shapes, the pressure drag is large compared to the friction drag ? |
| A. | Stream line body |
| B. | Two dimensional body |
| C. | Bluff body |
| D. | None of these |
| Answer» D. None of these | |
| 4284. |
The pump used for irrigation purposes is generally designed for |
| A. | large capacity & high head. |
| B. | large capacity & low head. |
| C. | small capacity & high head. |
| D. | small capacity & low head. |
| Answer» C. small capacity & high head. | |
| 4285. |
In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes |
| A. | less than atmospheric pressure. |
| B. | more than liquid vapor pressure. |
| C. | less than liquid vapor pressure. |
| D. | more than atmospheric pressure. |
| Answer» D. more than atmospheric pressure. | |
| 4286. |
Pressure gradient in the pipe flow is influenced by the |
| A. | diameter of pipe. |
| B. | velocity of the fluid. |
| C. | density & viscosity of the fluid. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 4287. |
__________ pump is the most suitable device for discharging a liquid against a pressure of 1500 kgf/cm2. |
| A. | Centrifugal |
| B. | Piston |
| C. | Plunger |
| D. | Vane |
| Answer» D. Vane | |
| 4288. |
Boiler feed water pump is usually a __________ pump. |
| A. | reciprocating |
| B. | gear |
| C. | multistage centrifugal |
| D. | diaphragm |
| Answer» D. diaphragm | |
| 4289. |
Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its |
| A. | inner diameter |
| B. | outer diameter |
| C. | thickness |
| D. | neither inner nor outer diameter |
| Answer» E. | |
| 4290. |
I.D. of 1/4" schedule 40 pipe is 0.364". I.D. of a 1/2" schedule 40 pipe would be __________ inch |
| A. | 4.728 |
| B. | 0.5 |
| C. | 0.622 |
| D. | 0.474 |
| Answer» D. 0.474 | |
| 4291. |
A centrifugal pump has the following specifications: Power = 4 H.P.; Speed = 800 rpmHead = 8 metresFlow = 1000 litres/minutes.If its speed is halved, the power consumed now will be __________ hp. |
| A. | 0.5 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» B. 2 | |
| 4292. |
Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter. |
| A. | 0.5 |
| B. | 5 |
| C. | 50 |
| D. | 100 |
| Answer» D. 100 | |
| 4293. |
Disc compensators are provided in large diameter fuel gas carrying pipelines to |
| A. | keep the pipe in proper orientation. |
| B. | make the pipe joint leak-proof. |
| C. | account for contraction/expansion of pipe due to temperature changes of the surroundings. |
| D. | account for the pressure variation side the pipeline. |
| Answer» D. account for the pressure variation side the pipeline. | |
| 4294. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft3/sec. |
| A. | 7.65 |
| B. | 32.36 |
| C. | 48.22 |
| D. | 125.6 |
| Answer» E. | |
| 4295. |
Paper pulp is an example of __________ fluid. |
| A. | dilatant |
| B. | bingham plastic |
| C. | Newtonion |
| D. | pseudoplastic |
| Answer» C. Newtonion | |
| 4296. |
Pick out the wrong statement about a streamline. |
| A. | It is always parallel to the main direction of the fluid flow. |
| B. | It is a line across which there is no flow and it is equivalent to a rigid boundary. |
| C. | Streamlines intersect at isolated point of zero velocity and infintie velocity. |
| D. | The fluid lying between any two streamlines can be considered to be in isolation and the streamline spacing varies inversely as the velocity. |
| Answer» B. It is a line across which there is no flow and it is equivalent to a rigid boundary. | |
| 4297. |
The most serious disadvantage of an orificemeter is that |
| A. | it is not very accurate. |
| B. | it is very costly. |
| C. | most of the pressure drop is not recoverable. |
| D. | it is not suitable for measuring gas flow. |
| Answer» D. it is not suitable for measuring gas flow. | |
| 4298. |
In case of supersonic flow of a fluid through pipeline, the 'Mach number' is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» E. | |
| 4299. |
The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter. |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.66 |
| D. | 0.95 |
| Answer» E. | |
| 4300. |
When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an |
| A. | ejector |
| B. | blower |
| C. | injector |
| D. | airlift |
| Answer» E. | |