MCQOPTIONS
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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.
| 1501. |
The maximum delivery pressure of compressors can be upto __________ atmospheres. |
| A. | 10 |
| B. | 100 |
| C. | 250 |
| D. | 1000 |
| Answer» E. | |
| 1502. |
Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an |
| A. | weir |
| B. | hot wire anemometer |
| C. | cup and vane aneometer |
| D. | none of these |
| Answer» C. cup and vane aneometer | |
| 1503. |
Location of vena-contracta in an orificemeter does not depend upon the |
| A. | type of orifice. |
| B. | density, viscosity & compressibility of the fluid. |
| C. | ratio of pipe diameter to orifice diameter. |
| D. | pipe roughness. |
| Answer» B. density, viscosity & compressibility of the fluid. | |
| 1504. |
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 | |
| 1505. |
One stoke (unit of kinematic viscosity) is equivalent to |
| A. | 1 cm2/second |
| B. | 1 m2/second |
| C. | 1 gm/cm. second |
| D. | 1 kg . m/second |
| Answer» B. 1 m2/second | |
| 1506. |
Viscosity of a liquid decreases __________ with rise in temperature. |
| A. | exponentially |
| B. | linearly |
| C. | logarithmically |
| D. | none of these |
| Answer» D. none of these | |
| 1507. |
For laminar flow of Newtonion fluid in a circular pipe, the velocity distribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship. |
| A. | logarithmic |
| B. | parabolic |
| C. | hyperbolic |
| D. | linear |
| Answer» C. hyperbolic | |
| 1508. |
Which of the following is not concerned with the fluid-particle interaction ? |
| A. | Drag co-efficient |
| B. | Froude number |
| C. | Galileo number |
| D. | Weber number |
| Answer» E. | |
| 1509. |
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)? |
| A. | 0.5 |
| B. | 1 |
| C. | 1.5 |
| D. | 2 |
| Answer» E. | |
| 1510. |
Colebrook equation for friction factor in turbulent flow is given by, . It reduces to Nikuradse equation for a value of equal to |
| A. | 0 |
| B. | 1 |
| C. | ‚àû |
| D. | 0.5 |
| Answer» C. ‚àû | |
| 1511. |
Purpose of relief valve in a reciprocating pump is to |
| A. | protect the pump against developing excessive pressure. |
| B. | facilitate unidirectional flow of liquid. |
| C. | reduce the discharge pressure. |
| D. | control the rate of discharge. |
| Answer» B. facilitate unidirectional flow of liquid. | |
| 1512. |
__________ pumps are axial flow pumps. |
| A. | Turbine |
| B. | Propeller |
| C. | Diffuser |
| D. | none of these |
| Answer» C. Diffuser | |
| 1513. |
Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively). |
| A. | FL-2T, ML-1T-1 |
| B. | FLT, ML-1T-1 |
| C. | ML-1T-3, F-1L2T |
| D. | F-1L2T-1, MLT-3 |
| Answer» B. FLT, ML-1T-1 | |
| 1514. |
A fluid is the one, which |
| A. | cannot remain at rest under the action of shear force. |
| B. | continuously expands till it fills any container. |
| C. | is incompressible. |
| D. | permanently resists distortion. |
| Answer» B. continuously expands till it fills any container. | |
| 1515. |
The frictional resistance in laminar flow does not depend on the |
| A. | area of surface in contact. |
| B. | flow velocity. |
| C. | fluid temperature. |
| D. | pressure of flow. |
| Answer» B. flow velocity. | |
| 1516. |
Shear stress in a fluid flowing in a round pipe |
| A. | varies parabolically across the cross-section. |
| B. | remains constant over the cross-section. |
| C. | is zero at the centre and varies linearly with the radius. |
| D. | is zero at the wall and increases linearly to the centre. |
| Answer» D. is zero at the wall and increases linearly to the centre. | |
| 1517. |
In which of the following cases, it is possible for flow to occur from low pressure to high pressure ? |
| A. | Flow of liquid upward in a vertical pipe. |
| B. | Flow through a converging section. |
| C. | Flow of air downward in a pipe. |
| D. | Impossible in a constant cross-section conduit. |
| Answer» C. Flow of air downward in a pipe. | |
| 1518. |
Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke's law range is |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 1519. |
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter) |
| A. | Vs/Dp2 |
| B. | Vs2/Dp2 |
| C. | Vs2/Dp3 |
| D. | Vs/Dp3 |
| Answer» B. Vs2/Dp2 | |
| 1520. |
Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump? |
| A. | Increasing the impeller speed and the volute area. |
| B. | Increasing the number of vanes in the impeller. |
| C. | Mounting of two or more impellers in series on a single shaft. |
| D. | Either of (a), (b) or (c). |
| Answer» D. Either of (a), (b) or (c). | |
| 1521. |
For pumping slurry, one can use a __________ pump. |
| A. | reciprocating |
| B. | diaphargm |
| C. | centrifugal |
| D. | pneumatic |
| Answer» C. centrifugal | |
| 1522. |
Capacity of a rotary gear pump can be varied by |
| A. | changing the speed of rotation. |
| B. | bleeding air into suction. |
| C. | bypassing liquid from the suction or discharge line. |
| D. | all (a), (6) and (c). |
| Answer» E. | |
| 1523. |
Nominal size of a pipe is an indication of its __________ diameter. |
| A. | inner |
| B. | outer |
| C. | approximate |
| D. | none of these |
| Answer» D. none of these | |
| 1524. |
At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump ? |
| A. | 40° and 140° |
| B. | 45° and 60° |
| C. | 90° and 80° |
| D. | 20° and 120° |
| Answer» B. 45¬∞ and 60¬∞ | |
| 1525. |
Foot valves provided in pumps are __________ valves. |
| A. | relief |
| B. | three/four way |
| C. | pressure reducing |
| D. | directional control |
| Answer» E. | |
| 1526. |
In a stabilised soap bubble, pressure inside it compared to external pressure is |
| A. | more |
| B. | less |
| C. | same |
| D. | unpredictable |
| Answer» B. less | |
| 1527. |
Drag force on the float of a rotameter is(where Q = flow rate of the ) |
| A. | ‚àùQ |
| B. | ‚àùQ |
| C. | ‚àùQ2 |
| D. | constant |
| Answer» E. | |
| 1528. |
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. | ε = ε0 + α.t |
| B. | ε = ε0 + α.t2 |
| C. | ε = ε0 + α.t3 |
| D. | ε = ε0 + α.t4 |
| Answer» B. Œµ = Œµ0 + Œ±.t2 | |
| 1529. |
The capacity of an accumulator is the maximum |
| A. | energy which it can store. |
| B. | discharge which it can deliver. |
| C. | liquid which it can store. |
| D. | none of these. |
| Answer» B. discharge which it can deliver. | |
| 1530. |
Dimension of absolute viscosity is |
| A. | ML-1T-1 |
| B. | MLT-1 |
| C. | ML-1T |
| D. | MLT |
| Answer» B. MLT-1 | |
| 1531. |
In area meter (e.g., rotameter), with increase in the fluid flow rate, the |
| A. | pressure drop increases linearly. |
| B. | pressure drop is almost constant. |
| C. | area through which fluid flows does not vary. |
| D. | none of these. |
| Answer» C. area through which fluid flows does not vary. | |
| 1532. |
For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor. |
| A. | brings about no further reduction of |
| B. | increases |
| C. | decreases |
| D. | none of these |
| Answer» B. increases | |
| 1533. |
Which of the following is not a dimension-less parameter ? |
| A. | Pressure-co-efficient |
| B. | Froude number |
| C. | Kinematic viscosity |
| D. | Weber number |
| Answer» D. Weber number | |
| 1534. |
Hot wire anemometer is used to measure the |
| A. | velocity of liquids. |
| B. | temperature of liquids. |
| C. | velocity of gases. |
| D. | pressure of liquids. |
| Answer» D. pressure of liquids. | |
| 1535. |
If the head over the triangular notch is doubled, the discharge will increase by __________ times. |
| A. | 2 |
| B. | 2.828 |
| C. | 5.657 |
| D. | 4 |
| Answer» D. 4 | |
| 1536. |
Which of the following conditions must be satisfied for lift force to be developed ? |
| A. | The body should be bluff body. |
| B. | The body should be stream lined. |
| C. | Circulation around the body is essentially required. |
| D. | The main stream velocity must approach the velocity of sound in that fluid medium. |
| Answer» D. The main stream velocity must approach the velocity of sound in that fluid medium. | |
| 1537. |
For very low pressure and high discharge rate, the compressor used is a/an __________ compressor. |
| A. | axial |
| B. | reciprocating |
| C. | rotary |
| D. | none of these |
| Answer» D. none of these | |
| 1538. |
Power required by a centrifugal pump is proportional to (where, D = diameter, N = r.p.m) |
| A. | N2D3 |
| B. | ND2 |
| C. | N2D |
| D. | N3D5 |
| Answer» E. | |
| 1539. |
The friction factor is |
| A. | always inversely proportional to the Reynolds number. |
| B. | not dimensionless. |
| C. | not dependent on the roughness of the pipe. |
| D. | none of these. |
| Answer» E. | |
| 1540. |
A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2, 1) is |
| A. | rotational and incompressible |
| B. | rotational and compressible |
| C. | irrotational and compressible |
| D. | irrotational and incompressible |
| Answer» C. irrotational and compressible | |
| 1541. |
For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter). |
| A. | 1/D |
| B. | 1/D2 |
| C. | 1/D5 |
| D. | D2 |
| Answer» D. D2 | |
| 1542. |
Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe. |
| A. | smaller than |
| B. | larger than |
| C. | same as |
| D. | twice |
| Answer» B. larger than | |
| 1543. |
Draining of shallow pits or sump is done by a sump pump, which is a __________ pump. |
| A. | single stage vertical |
| B. | centrifugal |
| C. | plunger |
| D. | diffuser |
| Answer» B. centrifugal | |
| 1544. |
Absolute viscosity of a fluid is a function of the __________ of the fluid. |
| A. | motion |
| B. | pressure & temperature |
| C. | shearing stress |
| D. | both(b)&(c) |
| Answer» E. | |
| 1545. |
A relief valve |
| A. | provides back pressure for a cylinder. |
| B. | unloads a pump. |
| C. | is a directional control valve. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1546. |
For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively). |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | either (a) or (b); depends on other factors |
| Answer» B. decrease | |
| 1547. |
Most commonly used joint in the underground pipe lines is the |
| A. | sleevejoint |
| B. | coupling |
| C. | flange |
| D. | expansion joint |
| Answer» B. coupling | |
| 1548. |
Pitot tube measures the __________ of a fluid. |
| A. | pressure |
| B. | average velocity |
| C. | average flow rate |
| D. | point velocity |
| Answer» E. | |
| 1549. |
The peripherial velocity at inlet of a centrifugal pump having inlet diameter of 25 cms and rotating at 950 rpm is __________ m/sec. |
| A. | 1.8 |
| B. | 12.4 |
| C. | 186.2 |
| D. | 736.4 |
| Answer» C. 186.2 | |
| 1550. |
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. | 1.65 |
| C. | 0.32 |
| D. | 0.94 |
| Answer» B. 1.65 | |