MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1608 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
What is the speed of sound (m/sec) in ordinary water? |
| A. | 500 |
| B. | 30 |
| C. | 000 |
| D. | 000 |
| Answer» B. 30 | |
| 102. |
N. second/m² is |
| A. | he S.I. unit of dynamic viscosity |
| B. | he S.I. unit of kinematic viscosity |
| C. | quivalent to one poise |
| D. | quivalent to one stoke |
| Answer» B. he S.I. unit of kinematic viscosity | |
| 103. |
Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f₁ and that for smooth pipe is f₂. Pick out the correct statement. |
| A. | ₁ = f₂ |
| B. | ₁ < f₂ |
| C. | ₁ > f₂ |
| D. | ata not sufficient to relate f₁ & f₂ |
| Answer» D. ata not sufficient to relate f₁ & f₂ | |
| 104. |
For a particle settling in water at its terminal settling velocity, which of the following is true? |
| A. | uoyancy = weight + drag |
| B. | eight = buoyancy + drag |
| C. | rag = buoyancy + weight |
| D. | rag = weight |
| Answer» C. rag = buoyancy + weight | |
| 105. |
Which of the following has the maximum compression ratio? |
| A. | lower |
| B. | ompressor |
| C. | acuum pump |
| D. | an |
| Answer» D. an | |
| 106. |
Which is not a variable head meter? |
| A. | enturimeter |
| B. | itot tube |
| C. | otameter |
| D. | one of these |
| Answer» D. one of these | |
| 107. |
A centrifugal pump designed for handling water (μ = 1 cp) will deliver __________ when pumping a thicker oil (μ = 30 cp). |
| A. | ess head & capacity |
| B. | ore head |
| C. | ore capacity |
| D. | ess head & more capacity |
| Answer» B. ore head | |
| 108. |
Which is the most efficient and best for measuring very small flow rate of gases? |
| A. | enturimeter |
| B. | rifice meter |
| C. | otameter |
| D. | low nozzle |
| Answer» D. low nozzle | |
| 109. |
The valve used for very remote and accurate control of fluid is a __________ valve. |
| A. | eedle |
| B. | lobe |
| C. | ate |
| D. | utterfly |
| Answer» B. lobe | |
| 110. |
What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir? |
| A. | enstock |
| B. | iphon |
| C. | unnel |
| D. | ressure pipeline |
| Answer» C. unnel | |
| 111. |
What is the ratio of fluid carrying capacity of two pipes having diameters d₁ and d₂ respectively? |
| A. | d₁/d₂)0.8 |
| B. | d₁/d₂)0.5 |
| C. | d₁/d₂) |
| D. | d₁/d₂)2 |
| Answer» C. d₁/d₂) | |
| 112. |
Each term of the Bernoulli's equation written in the form, P/ρ + g/gc .Z + v²/2gc = constant , represents the total energy per unit |
| A. | ass |
| B. | olume |
| C. | pecific weight |
| D. | one of these |
| Answer» B. olume | |
| 113. |
The energy equation, E + P/ρ + V²/2g +gZ (E = internal energy/mass), is applicable to |
| A. | erfect gases only |
| B. | sothermal flow of gases |
| C. | diabatic unsteady flow of gases |
| D. | ll of the above |
| Answer» E. | |
| 114. |
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft³/sec. |
| A. | 0.65 |
| B. | 2.36 |
| C. | 8.22 |
| D. | 25.6 |
| Answer» E. | |
| 115. |
A gas (density = 1.5 kg/m³ , viscosity = 2x 10⁻⁵ kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m³and viscosity of 3 x 10⁻⁵kg/m.s flowing at 3 m/s will be |
| A. | 400 Pa/m |
| B. | 2600 Pa/m |
| C. | 8900 Pa/m |
| D. | 6800 Pa/m |
| Answer» C. 8900 Pa/m | |
| 116. |
What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'Vavg'? |
| A. | Δp/8L |
| B. | Δp/4L |
| C. | . Vavg/D |
| D. | . Vavg/D |
| Answer» D. . Vavg/D | |
| 117. |
The percentage slip in a reciprocating pump set is given by the % of (where, Q₁ = actual discharge Q₂ = theoretical discharge) |
| A. | ₁/Q₂ |
| B. | ₂/Q₁ |
| C. | Q₂ - Q₁)/Q₁ |
| D. | Q₂ - Q₁)/Q₂ |
| Answer» E. | |
| 118. |
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. | 00 N |
| B. | 00 N |
| C. | 000 N |
| D. | 000 N |
| Answer» E. | |
| 119. |
Which of the following can be used to create a flow of gas, where no significant compression is required? |
| A. | eciprocating compressor |
| B. | lower |
| C. | xial flow compressor |
| D. | entrifugal compressor |
| Answer» C. xial flow compressor | |
| 120. |
Upto what value of 'Mach number', a fluid may be considered as incompressible? |
| A. | 0.03 |
| B. | 0.3 |
| C. | |
| Answer» C. | |
| 121. |
A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ₀ = 10 KPa, is shared between flat parallel plates separated by a distance of 10⁻³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is |
| A. | 0 KPa |
| B. | 0 KPa |
| C. | 0 KPa |
| D. | 0 KPa |
| Answer» C. 0 KPa | |
| 122. |
Which of the fluid forces are not considered in the Reynold's equation of flow? |
| A. | iscous forces |
| B. | urbulent forces |
| C. | ressure forces |
| D. | ompressibility forces |
| Answer» E. | |
| 123. |
Fanning equation is given by ∆p/ρ = 4f. L/D . v²/2g<.sub>c . It is applicable to __________ region flow. |
| A. | ransition |
| B. | aminar |
| C. | urbulent |
| D. | oth B and C |
| Answer» E. | |
| 124. |
What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta? |
| A. | 0.64 |
| B. | 0.65 |
| C. | 0.32 |
| D. | 0.94 |
| Answer» B. 0.65 | |
| 125. |
The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the __________ equation. |
| A. | ikuradse |
| B. | on-Karman |
| C. | lausius |
| D. | olebrook |
| Answer» B. on-Karman | |
| 126. |
Which of the following two quantities when same, makes one pipe system equivalent to another pipe system? |
| A. | ead & discharge |
| B. | ength & discharge |
| C. | ength & diameter |
| D. | riction factor & diameter |
| Answer» B. ength & discharge | |
| 127. |
What causes convective acceleration in fluid flow? |
| A. | teep slope in flow |
| B. | nsteady nature of flow |
| C. | on-uniformity of flow |
| D. | urbulence in flow |
| Answer» D. urbulence in flow | |
| 128. |
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow). |
| A. | e |
| B. | Re |
| C. | /Re |
| D. | e-1/2 |
| Answer» E. | |
| 129. |
Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time't'. α = a co-efficient to be experimentally determined)? |
| A. | = ε0 + α.t |
| B. | = ε0 + α.t² |
| C. | = ε0 + α.t³ |
| D. | = ε0 + α.t⁴ |
| Answer» B. = ε0 + α.t² | |
| 130. |
The maximum delivery pressure of a reciprocating compressor may be about __________ kg/cm². |
| A. | 000 |
| B. | 000 |
| C. | 000 |
| D. | 000 |
| Answer» E. | |
| 131. |
Which of the following may be termed as a variable orifice flowmeter? |
| A. | otameter |
| B. | itot tube |
| C. | -notch |
| D. | ll of the above |
| Answer» B. itot tube | |
| 132. |
Various efficiencies of a centrifugal pump are related as (where, ηm = mechanical efficiency ηv = volumetric efficiency. ηma = manometric efficiency ηo = overall efficiency) |
| A. | ma x ηm x ηv = ηo |
| B. | m = ηv . ηma |
| C. | ma = ηm x ηv |
| D. | v = ηm x ηma |
| Answer» C. ma = ηm x ηv | |
| 133. |
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to |
| A. | ρv²/D |
| B. | μ;V/D² |
| C. | ρv²/L |
| D. | V/L |
| Answer» B. μ;V/D² | |
| 134. |
Friction factor for a hydraulically smooth pipe at NRe = 2100 is f₁. If the pipe is further smoothened (i.e., roughness is reduced), the friction factor at the same value of NRe, will |
| A. | ncrease |
| B. | ecrease |
| C. | emain unchanged |
| D. | ncrease or decrease depending on the pipe material |
| Answer» B. ecrease | |
| 135. |
A bed consists of particles of density 2000 kg/m³. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is |
| A. | 5.61 kPa |
| B. | 1.77 kPa |
| C. | 4.86 kPa |
| D. | 1.13 kPa |
| Answer» C. 4.86 kPa | |
| 136. |
Which of the following valves will incur maximum pressure drop for the same discharge of water? |
| A. | lobe valve |
| B. | ate valve |
| C. | eedle valve |
| D. | utterfly valve |
| Answer» D. utterfly valve | |
| 137. |
Which of the following has the minimum compressibility? |
| A. | ater at room temperature |
| B. | ir at room temperature |
| C. | xygen at room temperature |
| D. | itrogen at room temperature |
| Answer» B. ir at room temperature | |
| 138. |
A pressure head of 320 metres of water in meters of CCl₄ (sp.gr = 1.6) will be |
| A. | 00 |
| B. | 00 |
| C. | 20 |
| D. | 60 |
| Answer» C. 20 | |
| 139. |
Horsepower increase of a centrifugal gas compressor without altering the volumetric flow rate will __________ the gas discharge pressure. |
| A. | ncrease |
| B. | ecrease |
| C. | ot change |
| D. | xponentially decrease |
| Answer» B. ecrease | |
| 140. |
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is |
| A. | p |
| B. | Δp |
| C. | Δp |
| D. | p² |
| Answer» D. p² | |
| 141. |
The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be |
| A. | p |
| B. | Δp |
| C. | p² |
| D. | p/2 |
| Answer» C. p² | |
| 142. |
The equation given below is called the __________ .f-0.5 = 4.07 loge (NRe√f)-0.6 |
| A. | olebrook formula |
| B. | on-Karman equation |
| C. | anning equation |
| D. | one of these |
| Answer» C. anning equation | |
| 143. |
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1 |
| A. | ncreases linearly with V |
| B. | ecreases linearly with V |
| C. | ecreases as V² |
| D. | one of these |
| Answer» B. ecreases linearly with V | |
| 144. |
In power law, ζ = A (du/dy)² + B , then the fluid is |
| A. | ewtonian |
| B. | ilatant |
| C. | hixotropic |
| D. | heopectic |
| Answer» B. ilatant | |
| 145. |
In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is |
| A. | onstant along a streamline |
| B. | ot constant along a streamline |
| C. | ncreased in the direction of flow |
| D. | one of these |
| Answer» C. ncreased in the direction of flow | |
| 146. |
Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition. |
| A. | /∂t = 0 |
| B. | /∂t = constant |
| C. | /∂s = 0 |
| D. | /∂t = constant |
| Answer» D. /∂t = constant | |
| 147. |
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s). |
| A. | 4000 |
| B. | 4 |
| C. | 0.24 |
| D. | 0.44 |
| Answer» E. | |
| 148. |
Which of the following is used for very accurate measurement of flow of gas at low velocity? |
| A. | itot tube |
| B. | otameter |
| C. | egmental orificemeter |
| D. | ot wire annemometer |
| Answer» E. | |
| 149. |
Which of the following is the most common pump for pumping either raw sewage or sludge? |
| A. | lectromagnetic pump |
| B. | entrifugal pump |
| C. | eciprocating pump |
| D. | ear pump |
| Answer» D. ear pump | |
| 150. |
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity.(II) Newton's second law of motion. (III) The continuity equation.(IV) Velocity of boundary layer must be zero relative to boundary.(V) Fluid cannot penetrate a boundary. |
| A. | , II, III |
| B. | I, III, V |
| C. | , II, V |
| D. | I, IV, V |
| Answer» C. , II, V | |