MCQOPTIONS
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MCQOPTIONS
This section includes 2158 Mcqs, each offering curated multiple-choice questions to sharpen your GATE (Mechanical Engineering) knowledge and support exam preparation. Choose a topic below to get started.
| 1951. |
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 | |
| 1952. |
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity) |
| A. | Vavg |
| B. | 1.2 Vavg |
| C. | 1.5 Vavg |
| D. | 1.8 Vavg |
| Answer» C. 1.5 Vavg | |
| 1953. |
The Stoke's stream function applies to the |
| A. | Irrotational flow only |
| B. | Ideal/non-viscous fluids only |
| C. | Cases of axial symmetry |
| D. | None of these |
| Answer» D. None of these | |
| 1954. |
Steady flow occurs, when the |
| A. | Conditions change steadily with time |
| B. | Conditions are the same at the adjacent points at any instant |
| C. | Conditions do not change with time at any point |
| D. | Rate of the velocity change is constant |
| Answer» D. Rate of the velocity change is constant | |
| 1955. |
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) |
| A. | √d |
| B. | d2/3 |
| C. | d4/5 |
| D. | d1/3 |
| Answer» D. d1/3 | |
| 1956. |
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) |
| A. | √d |
| B. | d1/3 |
| C. | d2 |
| D. | d2/3 |
| Answer» B. d1/3 | |
| 1957. |
For water, when the pressure increases, the viscosity |
| A. | Also increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First decreases, and then increases |
| Answer» E. | |
| 1958. |
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is |
| A. | √(HW/π) |
| B. | HW/2(H + W)² |
| C. | HW/4(H + W)² |
| D. | 2HW/(H + W)² |
| Answer» C. HW/4(H + W)² | |
| 1959. |
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is |
| A. | < 1 |
| B. | 1 |
| C. | > 1 |
| D. | 2 |
| Answer» B. 1 | |
| 1960. |
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. | 24000 |
| B. | 24 |
| C. | 0.24 |
| D. | 0.44 |
| Answer» E. | |
| 1961. |
Dimension of kinematic viscosity is |
| A. | MLT⁻¹ |
| B. | L² . T⁻¹ |
| C. | L²T |
| D. | L² . T⁻² |
| Answer» C. L²T | |
| 1962. |
The dimension of kinematic viscosity is |
| A. | ML⁻²T⁻¹ |
| B. | L²T⁻¹ |
| C. | ML⁻²T⁻² |
| D. | None of these |
| Answer» C. ML⁻²T⁻² | |
| 1963. |
In an incompressible flow of fluid, the fluid |
| A. | Temperature remains constant |
| B. | Compressibility is greater than zero |
| C. | Density does not change with pressure & temperature |
| D. | Is frictionless |
| Answer» D. Is frictionless | |
| 1964. |
Drag force on the float of a rotameter is(where Q = flow rate of the ) |
| A. | ∝Q |
| B. | ∝√Q |
| C. | ∝Q² |
| D. | Constant |
| Answer» E. | |
| 1965. |
Each term in Bernaulli's equation represents the __________ of the fluid. |
| A. | Energy per unit mass |
| B. | Energy per unit weight |
| C. | Force per unit mass |
| D. | None of these |
| Answer» C. Force per unit mass | |
| 1966. |
Venturimeter and orificemeter measures the __________ of the fluid. |
| A. | Pressure |
| B. | Maximum velocity |
| C. | Average velocity |
| D. | Point velocity |
| Answer» D. Point velocity | |
| 1967. |
The rate of change of moment of momentum represents the __________ by the fluid. |
| A. | Torque applied |
| B. | Force exerted |
| C. | Work done |
| D. | Power developed |
| Answer» B. Force exerted | |
| 1968. |
A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is __________ kg. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
| Answer» C. 1000 | |
| 1969. |
In case of a __________ the energy of flow is considerably decreased downstream of the machine. |
| A. | Blower |
| B. | Turbine |
| C. | Centrifugal pump |
| D. | Centrifugal fan |
| Answer» C. Centrifugal pump | |
| 1970. |
Hydraulic radius of 6" x 12" cross-section, is __________ inches. |
| A. | 2 |
| B. | 0.5 |
| C. | 1.5 |
| D. | None of these |
| Answer» B. 0.5 | |
| 1971. |
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 | |
| 1972. |
Which of the following facilitates close control of flow of fluids? |
| A. | Gate valve |
| B. | Globe valve |
| C. | Butterfly valve |
| D. | Check valve |
| Answer» C. Butterfly valve | |
| 1973. |
Priming is needed in a __________ pump. |
| A. | Reciprocating |
| B. | Gear |
| C. | Centrifugal |
| D. | Diaphragm |
| Answer» D. Diaphragm | |
| 1974. |
Newton's law of viscosity relates the |
| A. | Shear stress and velocity |
| B. | Velocity gradient and pressure intensity |
| C. | Shear stress and rate of angular deformation in a fluid |
| D. | Pressure gradient and rate of angular deformation |
| Answer» D. Pressure gradient and rate of angular deformation | |
| 1975. |
The speed of a sound wave in a gas is analogous to the speed of |
| A. | An elementary wave in an open channel |
| B. | Flow in an open channel |
| C. | A disturbance travelling upstream in moving fluid |
| D. | None of these |
| Answer» B. Flow in an open channel | |
| 1976. |
Bernoulli's equation is dependent on the |
| A. | First law of thermodynamics |
| B. | Third law of thermodynamics |
| C. | Law of conservation of momentum |
| D. | None of these |
| Answer» E. | |
| 1977. |
The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its |
| A. | Absolute viscosity |
| B. | Ratio of absolute viscosity to density |
| C. | Density |
| D. | Reynolds number |
| Answer» C. Density | |
| 1978. |
A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation? |
| A. | Inertial and drag forces are important |
| B. | Drag, gravitational and buoyancy forces are impportant |
| C. | Drag force and gravitational forces are important |
| D. | None of the above |
| Answer» C. Drag force and gravitational forces are important | |
| 1979. |
__________ pumps are a group of vacuum pumps. |
| A. | Hyter |
| B. | Sump |
| C. | Mono |
| D. | Submerged |
| Answer» B. Sump | |
| 1980. |
In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow? |
| A. | Discharge of water by a centrifugal pump being run at a constant rpm |
| B. | Water flow in the suction and discharge pipe of a reciprocating pump |
| C. | Water discharge from a vertical vessel in which constant level is maintained |
| D. | Low velocity flow of a highly viscous liquid through a hydraulically smooth pipe |
| Answer» C. Water discharge from a vertical vessel in which constant level is maintained | |
| 1981. |
Fluid flow in a/an __________ is an example of pressure flow. |
| A. | Partially filled pipeline |
| B. | Pipe |
| C. | Open channel |
| D. | River |
| Answer» C. Open channel | |
| 1982. |
The discharge through a semi-circular weir varies as (where, H = Head of liquid.) |
| A. | H |
| B. | H2 |
| C. | H3/2 |
| D. | H1/2 |
| Answer» C. H3/2 | |
| 1983. |
The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head. |
| A. | Elevation |
| B. | Velocity |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» C. Both A and B | |
| 1984. |
The discharge through a V-notch weir varies as |
| A. | H3/2 |
| B. | H1/2 |
| C. | H5/2 |
| D. | H2/3 |
| Answer» D. H2/3 | |
| 1985. |
If the discharge of a centrifugal pump is throttled, then its suction lift |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Data insufficient to predict |
| Answer» B. Decreases | |
| 1986. |
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units)If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 1987. |
The maximum depth from which a centrifugal pump can draw water is |
| A. | Dependent on the speed of the pump |
| B. | Dependent on the power of the pump |
| C. | 34 feet |
| D. | 150 feet |
| Answer» D. 150 feet | |
| 1988. |
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is |
| A. | 4.4 KPa |
| B. | 2.94 KPa |
| C. | 3.7 KPa |
| D. | None of these |
| Answer» B. 2.94 KPa | |
| 1989. |
The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its |
| A. | Viscosity |
| B. | Specific volume |
| C. | Velocity |
| D. | None of these |
| Answer» C. Velocity | |
| 1990. |
In an incompressible fluid, the density is |
| A. | Greatly affected by moderate changes in pressure |
| B. | Greatly affected only by moderate changes in temperature |
| C. | Not affected with moderate change in temperature & pressure |
| D. | Sensible to changes in both temperature & pressure |
| Answer» D. Sensible to changes in both temperature & pressure | |
| 1991. |
What is the maximum theoretical suction lift (metres) of a reciprocating pump? |
| A. | 5 |
| B. | 10 |
| C. | 50 |
| D. | 100 |
| Answer» C. 50 | |
| 1992. |
Pitot tube measures the __________ of a fluid. |
| A. | Pressure |
| B. | Average velocity |
| C. | Average flow rate |
| D. | Point velocity |
| Answer» E. | |
| 1993. |
Differential manometer measures the |
| A. | Atmospheric pressure |
| B. | Sub-atmospheric pressure |
| C. | Pressure difference between two points |
| D. | None of these |
| Answer» D. None of these | |
| 1994. |
Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure. |
| A. | Small differential |
| B. | Atmospheric |
| C. | Absolute |
| D. | Gage |
| Answer» B. Atmospheric | |
| 1995. |
For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is |
| A. | More |
| B. | Less |
| C. | Equal |
| D. | Either A or B; depends on the viscosity of the fluid |
| Answer» B. Less | |
| 1996. |
The pressure intensity is the same in all directions at a point in a fluid |
| A. | Only when the fluid is frictionless |
| B. | Only when the fluid is at rest having zero velocity |
| C. | When there is no motion of one fluid layer relative to an adjacent layer |
| D. | Regardless of the motion of one fluid layer relative to an adjacent layer |
| Answer» D. Regardless of the motion of one fluid layer relative to an adjacent layer | |
| 1997. |
In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature ) |
| A. | 1/√T |
| B. | 1/T |
| C. | √T |
| D. | T |
| Answer» D. T | |
| 1998. |
The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the |
| A. | Length is shorter |
| B. | Throat diameter is more |
| C. | Sudden expansion of flow in the downstream occurs |
| D. | Distance between the throat and the inlet is more |
| Answer» D. Distance between the throat and the inlet is more | |
| 1999. |
The speed of sound in an ideal gas varies as the |
| A. | Temperature |
| B. | Pressure |
| C. | Density |
| D. | None of these |
| Answer» B. Pressure | |
| 2000. |
Function of air vessel provided in a reciprocating pump is to |
| A. | Reduce discharge fluctuation |
| B. | Reduce the danger of cavitation |
| C. | Avoid the necessity of priming |
| D. | Increase the pump efficiency |
| Answer» B. Reduce the danger of cavitation | |