MCQOPTIONS
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MCQOPTIONS
This section includes 905 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream |
| A. | eeps on increasing |
| B. | eeps on decreasing |
| C. | emain constant |
| D. | ay increase/decrease |
| Answer» D. ay increase/decrease | |
| 102. |
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is |
| A. | 00 kg/cm² |
| B. | 000 kg/cm² |
| C. | 0 × 10⁵ kg/cm² |
| D. | 0 × 10⁶ kg/cm² |
| Answer» C. 0 × 10⁵ kg/cm² | |
| 103. |
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach) |
| A. | 2/3) Cd × L.√2g [H1 - Ha] |
| B. | 2/3) Cd × L. √2g [H13/2 - Ha3/2] |
| C. | 2/3) Cd × L.√2g [H12 - Ha2] |
| D. | 2/3) Cd × L. √2g [H15/2 - Ha5/2] |
| Answer» C. 2/3) Cd × L.√2g [H12 - Ha2] | |
| 104. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct? |
| A. | he pressure on the wall at the liquid level is minimum |
| B. | he pressure on the bottom of the wall is maximum |
| C. | he pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum |
| D. | he pressure on the bottom of the wall is zero |
| Answer» D. he pressure on the bottom of the wall is zero | |
| 105. |
The process of diffusion of one liquid into the other through a semi permeable membrane is called |
| A. | iscosity |
| B. | smosis |
| C. | urface tension |
| D. | ohesion |
| Answer» C. urface tension | |
| 106. |
The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid) |
| A. | μvl/wd² |
| B. | μvl/wd² |
| C. | 6μvl/wd² |
| D. | 2μvl/wd² |
| Answer» E. | |
| 107. |
The atmospheric pressure at sea level is |
| A. | 03 kN/m2 |
| B. | 0.3 m of water |
| C. | 60 mm of mercury |
| D. | ll of these |
| Answer» E. | |
| 108. |
The Euler's equation for the motion of liquids is based upon the assumption that |
| A. | he fluid is non - viscous, homogeneous and incompressible |
| B. | he velocity of flow is uniform over the section |
| C. | he flow is continuous, steady and along the stream line |
| D. | ll of the above |
| Answer» E. | |
| 109. |
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is |
| A. | v₁ - v₂)²/g |
| B. | v₁² - v₂²)/g |
| C. | v₁ - v₂)²/2g |
| D. | v₁² - v₂²)/2g |
| Answer» D. v₁² - v₂²)/2g | |
| 110. |
The depth of center of pressure of an immersed surface, inclined at an angle 'θ' with the liquid surface lies at a distance equal to __________ the center of gravity. |
| A. | G sin²θ/Ax̅ below |
| B. | G sin²θ/Ax̅ above |
| C. | G sinθ/Ax̅ below |
| D. | G sinθ/Ax̅ above |
| Answer» B. G sin²θ/Ax̅ above | |
| 111. |
The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge) |
| A. | = (2/3) Cd × b × √(2g) × (H2 - H1) |
| B. | = (2/3) Cd × b × √(2g) × (H21/2 - H11/2) |
| C. | = (2/3) Cd × b × √(2g) × (H23/2 - H13/2) |
| D. | = (2/3) Cd × b × √(2g) × (H22 - H12) |
| Answer» D. = (2/3) Cd × b × √(2g) × (H22 - H12) | |
| 112. |
The length of a liquid stream while flowing over a weir __________ at the ends of the sill. |
| A. | xpands |
| B. | oes not change |
| C. | ontracts |
| D. | one of these |
| Answer» D. one of these | |
| 113. |
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions) |
| A. | 2/3) × Cd (L - nH) × √(2gh) |
| B. | 2/3) × Cd (L - 0.1nH) × √(2g) × H3/2 |
| C. | 2/3) × Cd (L - nH) × √(2g) × H² |
| D. | 2/3) × Cd (L - nH) × √(2g) × H5/2 |
| Answer» C. 2/3) × Cd (L - nH) × √(2g) × H² | |
| 114. |
Power required (in watts) to drive a centrifugal pump is (where Hm = Manometric head in metres, w = Specific weight in N/m3, Q = Discharge of the pump in m3/s, and ηo = Overall efficiency of the pump) |
| A. | w Hm) / (Q × ηo) |
| B. | w Hm Q) / ηo |
| C. | w Q) / (Hm × ηo) |
| D. | w Qηo) / Hm |
| Answer» C. w Q) / (Hm × ηo) | |
| 115. |
According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2 where m is equal to |
| A. | .405 + (0.003/H) |
| B. | .003 + (0.405/H) |
| C. | .405 + (H/0.003) |
| D. | .003 + (H/0.405) |
| Answer» B. .003 + (0.405/H) | |
| 116. |
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called |
| A. | ensity of liquid |
| B. | pecific gravity of liquid |
| C. | ompressibility of liquid |
| D. | urface tension of liquid |
| Answer» C. ompressibility of liquid | |
| 117. |
The centre of pressure for a vertically immersed surface lies at a distance equal to __________ the centre of gravity. |
| A. | G / Ax̅ below |
| B. | G / Ax̅ above |
| C. | x̅ / IG below |
| D. | x̅ / IG above |
| Answer» B. G / Ax̅ above | |
| 118. |
The dynamic viscosity of gases __________ with rise in temperature. |
| A. | emain unaffected |
| B. | ncreases |
| C. | ecreases |
| D. | one of these |
| Answer» C. ecreases | |
| 119. |
The dynamic viscosity of the liquid __________ with rise in temperature. |
| A. | emain unaffected |
| B. | ncreases |
| C. | ecreases |
| D. | one of these |
| Answer» D. one of these | |
| 120. |
The pressure measured with the help of a pressure gauge is called |
| A. | tmospheric pressure |
| B. | auge pressure |
| C. | bsolute pressure |
| D. | ean pressure |
| Answer» C. bsolute pressure | |
| 121. |
To avoid an interruption in the flow of a siphon, an air vessel is provided |
| A. | t the inlet |
| B. | t the outlet |
| C. | t the summit |
| D. | t any point between inlet and outlet |
| Answer» D. t any point between inlet and outlet | |
| 122. |
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | ouble |
| B. | our times |
| C. | ight times |
| D. | ixteen times |
| Answer» E. | |
| 123. |
In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be |
| A. | ouble |
| B. | our times |
| C. | ight times |
| D. | ixteen times |
| Answer» B. our times | |
| 124. |
The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece. |
| A. | ess than |
| B. | ore than |
| C. | qual to |
| D. | one of these |
| Answer» B. ore than | |
| 125. |
A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface. |
| A. | /3 |
| B. | /2 |
| C. | H/3 |
| D. | H/4 |
| Answer» D. H/4 | |
| 126. |
The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface) |
| A. | IG/Ax̅) - x̅ |
| B. | IG/x̅) - Ax̅ |
| C. | Ax̅/IG) + x̅ |
| D. | IG/Ax̅) + x̅ |
| Answer» E. | |
| 127. |
The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface) |
| A. | A |
| B. | x |
| C. | Ax |
| D. | A/x |
| Answer» D. A/x | |
| 128. |
The mercury does not wet the glass. This is due to the property of the liquid known as |
| A. | ohesion |
| B. | dhesion |
| C. | iscosity |
| D. | urface tension |
| Answer» E. | |
| 129. |
A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used? |
| A. | elton wheel with one nozzle |
| B. | elton wheel with two or more nozzles |
| C. | aplan turbine |
| D. | rancis turbine |
| Answer» B. elton wheel with two or more nozzles | |
| 130. |
According to fan laws, for fans having constant wheel diameter, the pressure varies |
| A. | irectly as fan speed |
| B. | quare of fan speed |
| C. | ube of fan speed |
| D. | quare root of fan speed |
| Answer» C. ube of fan speed | |
| 131. |
One cubic metre of water weighs |
| A. | 00 liters |
| B. | 50 liters |
| C. | 00 liters |
| D. | 000 liters |
| Answer» E. | |
| 132. |
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice) |
| A. | = Cd × a × 2gh |
| B. | = (2/3). Cd × a × h |
| C. | = (Cd × a)/√(2gh) |
| D. | = (3Cd × a)/√(2h) |
| Answer» B. = (2/3). Cd × a × h | |
| 133. |
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice) |
| A. | = Cd × bH₁ × √(2gh) |
| B. | = Cd × bH2 × √(2gh) |
| C. | = Cd × b (H2 - H1) × √(2gh) |
| D. | = Cd × bH × √(2gh) |
| Answer» D. = Cd × bH × √(2gh) | |
| 134. |
A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest. |
| A. | qual to |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» D. one of these | |
| 135. |
A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest. |
| A. | qual to |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» C. ore than | |
| 136. |
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | .5 a. √2gH |
| B. | .707 a. √2gH |
| C. | .855 a. √2gH |
| D. | . √2gH |
| Answer» B. .707 a. √2gH | |
| 137. |
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece) |
| A. | .855 a.√(2gH) |
| B. | .855 aH.√(2g) |
| C. | .585 a.√(2gH) |
| D. | .85 aH.√(2g) |
| Answer» B. .855 aH.√(2g) | |
| 138. |
In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta. |
| A. | ess than |
| B. | ore than |
| C. | qual to |
| D. | one of these |
| Answer» B. ore than | |
| 139. |
In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be |
| A. | unning full |
| B. | unning free |
| C. | artially running full |
| D. | artially running free |
| Answer» C. artially running full | |
| 140. |
In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir. |
| A. | qual to |
| B. | ne-third |
| C. | wo-third |
| D. | hree-fourth |
| Answer» D. hree-fourth | |
| 141. |
The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H). |
| A. | / √H |
| B. | / H |
| C. | / H3/2 |
| D. | / H² |
| Answer» D. / H² | |
| 142. |
A pitot tube is used to measure the |
| A. | elocity of flow at the required point in a pipe |
| B. | ressure difference between two points in a pipe |
| C. | otal pressure of liquid flowing in a pipe |
| D. | ischarge through a pipe |
| Answer» B. ressure difference between two points in a pipe | |
| 143. |
A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water? |
| A. | 0 m/sec |
| B. | 5 m/sec |
| C. | m/sec |
| D. | 0 m/sec |
| Answer» D. 0 m/sec | |
| 144. |
The resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called |
| A. | p-thrust |
| B. | eaction |
| C. | uoyancy |
| D. | etacentre |
| Answer» D. etacentre | |
| 145. |
The center of gravity of the volume of the liquid displaced by an immersed body is called |
| A. | enter of gravity |
| B. | enter of pressure |
| C. | etacenter |
| D. | enter of buoyancy |
| Answer» E. | |
| 146. |
When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called |
| A. | auge pressure |
| B. | bsolute pressure |
| C. | ositive gauge pressure |
| D. | acuum pressure |
| Answer» D. acuum pressure | |
| 147. |
The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid. |
| A. | qual to |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» D. one of these | |
| 148. |
The power produced by the reaction turbine is ________ to the head of water. |
| A. | irectly proportional |
| B. | nversely proportional |
| C. | th power |
| D. | one of these |
| Answer» B. nversely proportional | |
| 149. |
The value of coefficient of velocity for a sharp edged orifice __________ with the head of water. |
| A. | ecreases |
| B. | ncreases |
| C. | emain same |
| D. | one of these |
| Answer» C. emain same | |
| 150. |
When the Mach number is less than unity, the flow is called |
| A. | ub-sonic flow |
| B. | onic flow |
| C. | uper-sonic flow |
| D. | yper-sonic flow |
| Answer» B. onic flow | |