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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.
| 4301. |
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | data insufficient to predict relative pressure drop. |
| Answer» C. remain unchanged | |
| 4302. |
What is the value of co-efficient of discharge for square edged circular orifice (for = 0.3 to 0.5) ? |
| A. | 0.61 - 0.63 |
| B. | 0.5 - 0.75 |
| C. | 0.75 - 0.90 |
| D. | 0.35 - 0.55 |
| Answer» B. 0.5 - 0.75 | |
| 4303. |
A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 4304. |
A pump operating under specific conditions delivers insufficient quantity of liquid. This may be set right by |
| A. | decreasing the size of the inlet pipe. |
| B. | increasing the size of the inlet pipe. |
| C. | lowering the pump position. |
| D. | both (b) and (c). |
| Answer» E. | |
| 4305. |
Two liquids manometer is used for measuring small pressure differences in |
| A. | liquids |
| B. | gases |
| C. | mixture of hydrocarbons |
| D. | none of these |
| Answer» C. mixture of hydrocarbons | |
| 4306. |
A piezometer provided in the pipe measures |
| A. | friction factor |
| B. | static pressure |
| C. | dynamic pressure |
| D. | none of these |
| Answer» C. dynamic pressure | |
| 4307. |
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will |
| A. | decrease |
| B. | increase |
| C. | remain same |
| D. | unpredictable |
| Answer» B. increase | |
| 4308. |
The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number. |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | may increase or decrease |
| Answer» C. remains same | |
| 4309. |
Low specific speed of a pump implies that, it is a/an __________ pump. |
| A. | axial flow |
| B. | centrifugal |
| C. | mixed flow |
| D. | none of these |
| Answer» C. mixed flow | |
| 4310. |
Pressure drop for laminar fluid flow through a circular pipe is given by |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-33.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/38-537-33.png"> | |
| 4311. |
As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches |
| A. | zero |
| B. | unity |
| C. | infinity |
| D. | an indeterminate value |
| Answer» C. infinity | |
| 4312. |
For any system, what is the minimum number of degrees of freedom? |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 4313. |
At 60 C, vapour pressure of methanol and water are 84.562 kPa and 19.953 kPa respectively. An aqueous solution of methanol at 60 C exerts a pressure of 39.223 kPa; the liquid phase and vapour phase mole fractions of methanol are 0.1686 and 0.5714 respectively. Activity co-efficient of methanol is |
| A. | 1.572 |
| B. | 1.9398 |
| C. | 3.389 |
| D. | 4.238 |
| Answer» B. 1.9398 | |
| 4314. |
Gases are cooled in Joule-Thomson expansion, when it is __________ inversion temperature. |
| A. | below |
| B. | at |
| C. | above |
| D. | either 'b' or 'c' |
| Answer» B. at | |
| 4315. |
PVy = constant, holds good for an isentropic process, which is |
| A. | reversible and isothermal. |
| B. | isothermal and irreversible. |
| C. | reversible and adiabatic. |
| D. | adiabatic and irreversible. |
| Answer» D. adiabatic and irreversible. | |
| 4316. |
The equilibrium constant for a chemical reaction at two different temperatures is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/418-399-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/418-399-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/418-399-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/418-399-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/418-399-2.png"> | |
| 4317. |
Which is not a state function ? |
| A. | Specific volume |
| B. | Work |
| C. | Pressure |
| D. | Temperature |
| Answer» C. Pressure | |
| 4318. |
For an ideal liquid solution, which of the following is unity ? |
| A. | Activity |
| B. | Fugacity |
| C. | Activity co-efficient |
| D. | Fugacity co-efficient |
| Answer» D. Fugacity co-efficient | |
| 4319. |
In the decomposition of PCl5 represented by, PCl5 PCl3 + Cl2, decrease in the pressure of the system will __________ the degree of dissociation of PCl5. |
| A. | increase |
| B. | decrease |
| C. | not alter |
| D. | none of these |
| Answer» B. decrease | |
| 4320. |
Claude's liquefaction process employs the cooling of gases by |
| A. | expansion in an engine |
| B. | following a constant pressure cycle |
| C. | throttling |
| D. | none of these |
| Answer» B. following a constant pressure cycle | |
| 4321. |
The expression for entropy change given by, S = nR ln (V2/V1) + nCv ln (T2/T1) is valid for |
| A. | reversible isothermal volume change. |
| B. | heating of a substance. |
| C. | cooling of a substance. |
| D. | simultaneous heating and expansion of an ideal gas. |
| Answer» E. | |
| 4322. |
In a homogeneous solution, the fugacity of a component depends upon the |
| A. | pressure |
| B. | composition |
| C. | temperature |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4323. |
For an incompressible fluid, the __________ is a function of both pressure as well as temperature. |
| A. | internal energy |
| B. | enthalpy |
| C. | entropy |
| D. | all (a), (b) & (c) |
| Answer» C. entropy | |
| 4324. |
One ton of refrigeration capacity is equivalent to the heat removal rate of |
| A. | 50 k cal/hr |
| B. | 200 BTU/hr |
| C. | 200 BTU/minute |
| D. | 200 BTU/day |
| Answer» D. 200 BTU/day | |
| 4325. |
What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 4326. |
Forces acting on a particle settling in fluid are __________ forces. |
| A. | gravitational & buoyant. |
| B. | centrifugal & drag. |
| C. | gravitational or centrifugal buoyant drag. |
| D. | external, drag & viscous. |
| Answer» D. external, drag & viscous. | |
| 4327. |
For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the |
| A. | square of the radial distance. |
| B. | radial distance linearly. |
| C. | inverse of the radial distance. |
| D. | elevation along vertical direction. |
| Answer» B. radial distance linearly. | |
| 4328. |
Specific speed of a centrifugal pump depends upon the __________ head. |
| A. | suction |
| B. | delivery |
| C. | manometric |
| D. | none of these |
| Answer» E. | |
| 4329. |
Navier-Stokes equation is useful in the analysis of __________ fluid flow problems. |
| A. | non-viscous |
| B. | viscous |
| C. | turbulent |
| D. | rotational |
| Answer» C. turbulent | |
| 4330. |
In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible __________ process. |
| A. | isometric |
| B. | polytropic |
| C. | isentropic |
| D. | isobaric |
| Answer» C. isentropic | |
| 4331. |
Throttling process is a/an __________ process. |
| A. | reversible and isothermal |
| B. | irreversible and constant enthalpy |
| C. | reversible and constant entropy |
| D. | reversible and constant enthalpy |
| Answer» C. reversible and constant entropy | |
| 4332. |
The main feature of Carnot refrigeration cycle is that, it |
| A. | does not need the addition of external work for its functioning. |
| B. | transfers heat from high temperature to low temperature. |
| C. | accomplishes the reverse effect of the heat engine. |
| D. | none of these. |
| Answer» D. none of these. | |
| 4333. |
Heat of reaction at constant volume is identified with __________ change. |
| A. | enthalpy |
| B. | internal energy |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 4334. |
Ideal gas law is applicable at |
| A. | low T, low P |
| B. | high T, high P |
| C. | low T, high P |
| D. | high T, low P |
| Answer» E. | |
| 4335. |
Reduced pressure of a gas is the ratio of its |
| A. | pressure to critical pressure. |
| B. | critical pressure to pressure. |
| C. | pressure to pseudocritical pressure. |
| D. | pseudocritical pressure to pressure. |
| Answer» B. critical pressure to pressure. | |
| 4336. |
Entropy change for an irreversible process taking system and surrounding together is |
| A. | 0 |
| B. | > 0 |
| C. | < 0 |
| D. | none of these |
| Answer» C. < 0 | |
| 4337. |
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same. |
| A. | kinematic viscosity |
| B. | work |
| C. | temperature |
| D. | none of these |
| Answer» E. | |
| 4338. |
The chemical potential of a component ( i) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of sustance added for an infinitesimal addition at constant temperature and pressure. It is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/421-430-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/421-430-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/421-430-3.png"> |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 4339. |
In jet refrigerators, the refrigerating fluid is practically always |
| A. | water |
| B. | ammonia |
| C. | freon |
| D. | brine |
| Answer» B. ammonia | |
| 4340. |
Water on heating from 1 to 4 C |
| A. | contracts |
| B. | expands |
| C. | has same volume |
| D. | may contract or expand |
| Answer» B. expands | |
| 4341. |
Equilibrium constant decreases as the temperature |
| A. | increases, for an exothermic reaction. |
| B. | decreases, for an exothermic reaction. |
| C. | increases, for an endothermic reaction. |
| D. | none of these. |
| Answer» B. decreases, for an exothermic reaction. | |
| 4342. |
The expression, , gives the free energy change |
| A. | with pressure changes at constant temperature. |
| B. | under reversible isothermal volume change. |
| C. | during heating of an ideal gas. |
| D. | during cooling of an ideal gas. |
| Answer» B. under reversible isothermal volume change. | |
| 4343. |
Compressibility factor for almost all the gases are approximately same at the same |
| A. | pressure and temperature. |
| B. | reduced pressure and reduced temperature. |
| C. | critical pressure and critical temperature. |
| D. | none of these. |
| Answer» C. critical pressure and critical temperature. | |
| 4344. |
Out of the following refrigeration cycles, which one has maximum COP ? |
| A. | Air cycle |
| B. | Carnot cycle |
| C. | Ordinary vapor compression cycle |
| D. | Vapor compression with a reversible expansion engine |
| Answer» C. Ordinary vapor compression cycle | |
| 4345. |
Pick out the correct statement: |
| A. | In an isothermal system, irreversible work is more than reversible work. |
| B. | Under reversible conditions, the adiabatic work is less than isothermal work. |
| C. | Heat, work, enthalpy and entropy are all 'state functions'. |
| D. | Matter and energy can not be exchanged with the surroundings in a closed system. |
| Answer» C. Heat, work, enthalpy and entropy are all 'state functions'. | |
| 4346. |
Which of the following is a thermodynamic property of a system ? |
| A. | Concentration |
| B. | Mass |
| C. | Temperature |
| D. | Entropy |
| Answer» E. | |
| 4347. |
Linde gas liquefaction process employs cooling |
| A. | by throttling |
| B. | by expansion in an engine |
| C. | at constant pressure |
| D. | none of these |
| Answer» B. by expansion in an engine | |
| 4348. |
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of |
| A. | powder & grannular solids |
| B. | liquids |
| C. | low melting point semi-solids |
| D. | all 'a', 'b' & 'c' |
| Answer» E. | |
| 4349. |
Euler's equation of motion is a statement expressing |
| A. | conservation of mass. |
| B. | conservation of energy. |
| C. | Newton's first law of motion. |
| D. | Newton's second law of motion. |
| Answer» B. conservation of energy. | |
| 4350. |
During ageing of fluid carrying pipes, the |
| A. | pipe becomes smoother with use. |
| B. | friction factor increases linearly with time. |
| C. | absolute roughness decreases with time. |
| D. | absolute roughness increases linearly with time. |
| Answer» E. | |