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.
| 151. |
When the Mach number is more than 6, the flow is called |
| A. | ub-sonic flow |
| B. | onic flow |
| C. | uper-sonic flow |
| D. | yper-sonic flow |
| Answer» E. | |
| 152. |
If the depth of water in an open channel is less than the critical depth, the flow is called |
| A. | ritical flow |
| B. | urbulent flow |
| C. | ranquil flow |
| D. | orrential flow |
| Answer» E. | |
| 153. |
All the terms of energy in Bernoulli's equation have dimension of |
| A. | nergy |
| B. | ork |
| C. | ass |
| D. | ength |
| Answer» E. | |
| 154. |
A flow is called sub-sonic, if the Mach number is |
| A. | ess than unity |
| B. | nity |
| C. | etween 1 and 6 |
| D. | ore than 6 |
| Answer» B. nity | |
| 155. |
A flow is called hyper-sonic, if the Mach number is |
| A. | ess than unity |
| B. | nity |
| C. | etween 1 and 6 |
| D. | one of these |
| Answer» E. | |
| 156. |
A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is |
| A. | .53 kN |
| B. | 3.3 kN |
| C. | 5.3 kN |
| D. | one of these |
| Answer» D. one of these | |
| 157. |
The viscosity of a liquid __________ its rate of flow through a hole in a vessel. |
| A. | ffects |
| B. | oes not effect |
| C. | oth A and B |
| D. | one of these |
| Answer» B. oes not effect | |
| 158. |
Which of the following manometer has highest sensitivity? |
| A. | -tube with water |
| B. | nclined U-tube |
| C. | -tube with mercury |
| D. | icro-manometer with water |
| Answer» E. | |
| 159. |
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures. |
| A. | um |
| B. | ifference |
| C. | rithmetic mean |
| D. | eometric mean |
| Answer» C. rithmetic mean | |
| 160. |
The velocity corresponding to Reynold number of 2800, is called |
| A. | ub-sonic velocity |
| B. | uper-sonic velocity |
| C. | ower critical velocity |
| D. | igher critical velocity |
| Answer» E. | |
| 161. |
For pipes, turbulent flow occurs when Reynolds number is |
| A. | ess than 2000 |
| B. | etween 2000 and 4000 |
| C. | ore than 4000 |
| D. | ess than 4000 |
| Answer» D. ess than 4000 | |
| 162. |
For pipes, laminar flow occurs when Reynolds number is |
| A. | ess than 2000 |
| B. | etween 2000 and 4000 |
| C. | ore than 4000 |
| D. | ess than 4000 |
| Answer» B. etween 2000 and 4000 | |
| 163. |
The stress-strain relation of the Newtonian fluid is |
| A. | inear |
| B. | arabolic |
| C. | yperbolic |
| D. | nverse type |
| Answer» B. arabolic | |
| 164. |
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) is |
| A. | h = ηo × ηm |
| B. | m = ηm × ηh |
| C. | o = ηh × ηm |
| D. | one of these |
| Answer» D. one of these | |
| 165. |
With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will |
| A. | ecrease |
| B. | ncrease |
| C. | emain unchanged |
| D. | epend upon the characteristics of liquid |
| Answer» B. ncrease | |
| 166. |
The hydraulic mean depth for a circular pipe of diameter (d) is |
| A. | /6 |
| B. | /4 |
| C. | /2 |
| Answer» C. /2 | |
| 167. |
The purpose of a surge tank is |
| A. | o control the pressure variations due to rapid changes in the pipe line flow |
| B. | o eliminate water hammer possibilities |
| C. | o regulate flow of water to turbines by providing necessary retarding head of water |
| D. | ll of the above |
| Answer» E. | |
| 168. |
A structure, whose width is __________ the width of the channel, is called a flumed structure. |
| A. | ess than |
| B. | ore than |
| C. | qual |
| D. | one of these |
| Answer» B. ore than | |
| 169. |
Two dimensional flows occurs when |
| A. | he direction and magnitude of the velocity at all points are identical |
| B. | he velocity of successive fluid particles, at any point, is the same at successive periods of time |
| C. | he magnitude and direction of the velocity do not change from point to point in the fluid |
| D. | he fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane |
| Answer» E. | |
| 170. |
The top of the weir over which the water flows is known as |
| A. | ill or crest |
| B. | appe or vein |
| C. | rifice |
| D. | one of these |
| Answer» B. appe or vein | |
| 171. |
The increase in pressure at the outer edge of a drum of radius (r) completely filled up with liquid of density (ρ) and rotating at (ω) rad/s is |
| A. | ω2 r2 |
| B. | ρ ω2 r2 |
| C. | ω2 r2/2 |
| D. | ω2 r2/4 |
| Answer» D. ω2 r2/4 | |
| 172. |
The intensity of pressure at any point, in a liquid, is __________ to the depth of liquid from the surface. |
| A. | qual |
| B. | irectly proportional |
| C. | nversely proportional |
| D. | one of these |
| Answer» C. nversely proportional | |
| 173. |
A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is |
| A. | .5 kN/m3 |
| B. | kN/m3 |
| C. | .5 kN/m3 |
| D. | 0 kN/m3 |
| Answer» D. 0 kN/m3 | |
| 174. |
The unit discharge through the turbine is |
| A. | /√H |
| B. | /H |
| C. | /H3/2 |
| D. | /H² |
| Answer» B. /H | |
| 175. |
A nozzle is generally made of |
| A. | ylindrical shape |
| B. | onvergent shape |
| C. | ivergent shape |
| D. | onvergent-divergent shape |
| Answer» C. ivergent shape | |
| 176. |
In a Francis turbine runner, the numbers of blades are generally between |
| A. | to 4 |
| B. | to 8 |
| C. | to 16 |
| D. | 6 to 24 |
| Answer» E. | |
| 177. |
A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is |
| A. | .25 m3/s |
| B. | .5 m3/s |
| C. | .5 m3/s |
| D. | .5 m3/s |
| Answer» B. .5 m3/s | |
| 178. |
In case of flow through parallel pipes, |
| A. | he head loss for all the pipes is same |
| B. | he total discharge is equal to the sum of discharges in the various pipes |
| C. | he total head loss is the sum of head losses in the various pipes |
| D. | oth (A) and (B) |
| Answer» E. | |
| 179. |
The time oscillation of a floating body with increase in meatcentric height will be |
| A. | ame |
| B. | igher |
| C. | ower |
| D. | ower/higher depending on weight of body |
| Answer» D. ower/higher depending on weight of body | |
| 180. |
The discharge over a triangular notch is |
| A. | nversely proportional to H3/2 |
| B. | irectly proportional to H3/2 |
| C. | nversely proportional to H5/2 |
| D. | irectly proportional to H5/2 |
| Answer» E. | |
| 181. |
When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure |
| A. | aries as the square of the radial distance |
| B. | ncreases linearly as its radial distance |
| C. | ncreases as the square of the radial distance |
| D. | ecreases as the square of the radial distance |
| Answer» B. ncreases linearly as its radial distance | |
| 182. |
The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid) |
| A. | .ρ |
| B. | /ρ |
| C. | /K |
| D. | one of these |
| Answer» C. /K | |
| 183. |
In axial flow fans and turbines, fluid enters and leaves as follows |
| A. | adially, axially |
| B. | xially, radially |
| C. | xially, axially |
| D. | adially, radially |
| Answer» D. adially, radially | |
| 184. |
A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used? |
| A. | : 5 |
| B. | : 2.5 |
| C. | : 25 |
| D. | : ?5 |
| Answer» B. : 2.5 | |
| 185. |
The total pressure on an immersed surface inclined at an angle θ with the liquid surface is |
| A. | A |
| B. | x |
| C. | Ax |
| D. | Ax/sinθ |
| Answer» D. Ax/sinθ | |
| 186. |
The body will float if the force of buoyancy is __________ the weight of the liquid displaced. |
| A. | qual to |
| B. | ess than |
| C. | ore than |
| D. | one of these |
| Answer» D. one of these | |
| 187. |
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is |
| A. | .r/2g |
| B. | ².r²/2g |
| C. | .r/4g |
| D. | ².r²/4g |
| Answer» C. .r/4g | |
| 188. |
The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be |
| A. | metres of water column |
| B. | metres of water column |
| C. | .5 metres of water column |
| D. | m of water column |
| Answer» C. .5 metres of water column | |
| 189. |
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be |
| A. | meters of water column |
| B. | meters of water column |
| C. | meters of water column |
| D. | meters of water Column |
| Answer» E. | |
| 190. |
Head developed by a centrifugal pump depends on |
| A. | mpeller diameter |
| B. | peed |
| C. | luid density |
| D. | oth (A) and (B) above |
| Answer» E. | |
| 191. |
A weir, generally, used as a spillway of a dam is |
| A. | arrow crested weir |
| B. | road crested weir |
| C. | gee weir |
| D. | ubmerged weir |
| Answer» D. ubmerged weir | |
| 192. |
The discharge through a channel of rectangular section will be maximum, if |
| A. | ts depth is twice the breadth |
| B. | ts breadth is twice the depth |
| C. | ts depth is thrice the breadth |
| D. | ts breadth is thrice the depth |
| Answer» C. ts depth is thrice the breadth | |
| 193. |
A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a |
| A. | otch |
| B. | eir |
| C. | outhpiece |
| D. | ozzle |
| Answer» D. ozzle | |
| 194. |
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre |
| A. | oincides with its centre of gravity |
| B. | ies above its centre of gravity |
| C. | ies below its centre of gravity |
| D. | ies between the centre of buoyancy and centre of gravity |
| Answer» B. ies above its centre of gravity | |
| 195. |
Medium specific speed of turbine implies it is |
| A. | ropeller turbine |
| B. | rancis turbine |
| C. | mpulse turbine |
| D. | ny one of the above |
| Answer» C. mpulse turbine | |
| 196. |
Low specific speed of turbine implies it is |
| A. | ropeller turbine |
| B. | rancis turbine |
| C. | mpulse turbine |
| D. | ny one of the above |
| Answer» D. ny one of the above | |
| 197. |
Bernoulli's equation is applied to |
| A. | enturimeter |
| B. | rifice meter |
| C. | itot tube |
| D. | ll of these |
| Answer» E. | |
| 198. |
Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow. |
| A. | um |
| B. | ifferent |
| C. | roduct |
| D. | atio |
| Answer» D. atio | |
| 199. |
The centre of pressure acts __________ the centre of gravity of immersed surface. |
| A. | t |
| B. | bove |
| C. | elow |
| D. | one of these |
| Answer» D. one of these | |
| 200. |
Venturimeter is used to |
| A. | easure the velocity of a flowing liquid |
| B. | easure the pressure of a flowing liquid |
| C. | easure the discharge of liquid flowing in a pipe |
| D. | easure the pressure difference of liquid flowing between two points in a pipe line |
| Answer» D. easure the pressure difference of liquid flowing between two points in a pipe line | |