McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 101. |
Tangential velocity of blade of Pelton wheel is proportional to |
| A. | Speed of wheel |
| B. | Angular velocity of wheel |
| C. | Rpm of wheel |
| D. | Speed, angular velocity, RPM of the wheel |
| Answer» A. Speed of wheel | |
| 102. |
In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude? |
| A. | Pelton turbine |
| B. | Propeller turbine |
| C. | Kaplan turbine |
| D. | Francis turbine |
| Answer» A. Pelton turbine | |
| 103. |
In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is |
| A. | x- component of V(r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» A. x- component of V(r2) – blade velocity | |
| 104. |
In Pelton wheel, if outlet velocity angle of jet is “obtuseangled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» C. Blade velocity – x- component of V (r2) | |
| 105. |
In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is |
| A. | x- component of V (r2) – blade velocity |
| B. | x- component of V (r2) + blade velocity |
| C. | Blade velocity – x- component of V (r2) |
| D. | Zero |
| Answer» D. Zero | |
| 106. |
In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is |
| A. | Difference between inlet jet velocity and blade velocity |
| B. | Sum of inlet jet velocity and blade velocity |
| C. | Inlet jet velocity |
| D. | Blade velocity |
| Answer» A. Difference between inlet jet velocity and blade velocity | |
| 107. |
In Pelton wheel if angle of deflection is not mentioned then we assume it as_ |
| A. | 150 degrees |
| B. | 200 degrees |
| C. | 165 degrees |
| D. | 185 degrees |
| Answer» C. 165 degrees | |
| 108. |
The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression |
| A. | [Vw1+Vw2] u/g |
| B. | Vw1*u/g |
| C. | [Vw1+Vw2]/g |
| D. | [Vw1+Vw2]u |
| Answer» A. [Vw1+Vw2] u/g | |
| 109. |
In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as |
| A. | Shaft power |
| B. | Runner power |
| C. | Output power |
| D. | Water power |
| Answer» B. Runner power | |
| 110. |
In Pelton turbines the expression for power delivered at inlet to runner is given by |
| A. | W*[Vw1+Vw2]u/g |
| B. | W*[Vw1-Vw2]u/g |
| C. | W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g |
| D. | [Vw1+Vw2]u/g |
| Answer» C. W*[Vw1+Vw2]u/g, W*[Vw1-Vw2]u/g | |
| 111. |
Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94? |
| A. | 200Kw |
| B. | 150Kw |
| C. | 187Kw |
| D. | 250Kw |
| Answer» C. 187Kw | |
| 112. |
10.The expression for water power in Pelton wheel is |
| A. | (P*g*Q*H) Kw |
| B. | (g*Q*H*a) Kw |
| C. | (g*Q) Kw |
| D. | (g*H) Kw |
| Answer» A. (P*g*Q*H) Kw | |
| 113. |
The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to |
| A. | V/2 |
| B. | V/3 |
| C. | V/4 |
| D. | V/5 |
| Answer» A. V/2 | |
| 114. |
In Pelton turbine is defined as ratio between power delivered to runner and power supplied at inlet of turbine |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» C. Hydraulic efficiency | |
| 115. |
In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 116. |
In Pelton is ratio of volume of water actually striking the runner and volume of water supplied to turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 117. |
In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 118. |
The expression for maximum hydraulic efficiency of Pelto turbine is given by |
| A. | (1+cos k)/2 where k is outlet blade angle |
| B. | (2+cos k)/2 where k is outlet blade angle |
| C. | (3+cos k)/2 where k is outlet blade angle |
| D. | (4+cos k)/2 where k is outlet blade angle |
| Answer» A. (1+cos k)/2 where k is outlet blade angle | |
| 119. |
In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as |
| A. | Specific density of liquid |
| B. | Density of liquid |
| C. | Specific gravity of liquid |
| D. | Volume of liquid |
| Answer» B. Density of liquid | |
| 120. |
Design of Pelton wheel means the following data is to be determined. |
| A. | Width of buckets |
| B. | Depth of buckets |
| C. | Number of buckets |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 121. |
The width of buckets of Pelton wheel is |
| A. | 2 times diameter of jet |
| B. | 3 times diameter of jet |
| C. | 4 times diameter of jet |
| D. | 5 times diameter of jet |
| Answer» D. 5 times diameter of jet | |
| 122. |
The depth of buckets of Pelton wheel |
| A. | 1.2 times diameter of jet |
| B. | 1.3 times diameter of jet |
| C. | 1.4 times diameter of jet |
| D. | 1.5 times diameter of jet |
| Answer» A. 1.2 times diameter of jet | |
| 123. |
The ratio of pitch diameter of Pelton wheel to diameter of jet is known as |
| A. | Speed ratio |
| B. | Jet ratio |
| C. | Velocity ratio |
| D. | Co-efficient of velocity |
| Answer» B. Jet ratio | |
| 124. |
Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm. |
| A. | 1.25 meters |
| B. | 1.5 meters |
| C. | 2 meters |
| D. | 1.2 meters |
| Answer» A. 1.25 meters | |
| 125. |
The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is |
| A. | 80mm |
| B. | 85mm |
| C. | 90mm |
| D. | 82mm |
| Answer» B. 85mm | |
| 126. |
In most of cases the value of jet ratio is |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» C. 12 | |
| 127. |
Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet) |
| A. | 15 + D/2d |
| B. | 15 + 3D/2d |
| C. | 15 + D/d |
| D. | 15 + 2D/d |
| Answer» A. 15 + D/2d | |
| 128. |
is obtained by dividing total rate of flow through the turbine by rate of flow through single jet. |
| A. | Number of jets |
| B. | Diameter of jets |
| C. | Velocity of jets |
| D. | Speed ratio |
| Answer» A. Number of jets | |
| 129. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets. |
| A. | 400mm |
| B. | 500mm |
| C. | 420mm |
| D. | 425mm |
| Answer» D. 425mm | |
| 130. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is |
| A. | 100mm |
| B. | 105mm |
| C. | 106mm |
| D. | 102mm |
| Answer» D. 102mm | |
| 131. |
If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately |
| A. | 20 |
| B. | 22 |
| C. | 23 |
| D. | 25 |
| Answer» D. 25 | |
| 132. |
Radial flow reaction turbines are those turbines in which water flows |
| A. | Radial direction |
| B. | Axial direction |
| C. | Tangential direction |
| D. | All of the mentioned |
| Answer» A. Radial direction | |
| 133. |
Main parts of radial flow reaction turbines are |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 134. |
Radial flow reaction turbines contain spiral casing which area |
| A. | Remains constant |
| B. | Gradually decreases |
| C. | Gradually increases |
| D. | Suddenly decreases |
| Answer» B. Gradually decreases | |
| 135. |
consists of stationary circular wheel all around the runner of turbine |
| A. | Casing |
| B. | Guide mechanism |
| C. | Runner |
| D. | Drafting |
| Answer» B. Guide mechanism | |
| 136. |
The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner |
| A. | Variable acceleration |
| B. | Constant acceleration |
| C. | Variable velocity |
| D. | Constant velocity |
| Answer» D. Constant velocity | |
| 137. |
allow the water to strike the vanes fixed on runner without shock at inlet |
| A. | Casing |
| B. | Guide vanes |
| C. | Runner |
| D. | Draft tube |
| Answer» B. Guide vanes | |
| 138. |
Runner blades are made up of |
| A. | Cast steel |
| B. | Cast iron |
| C. | Wrought iron |
| D. | Steel |
| Answer» A. Cast steel | |
| 139. |
The pressure at the exit of runner of reaction turbine is generally than atmospheric pressure |
| A. | Greater |
| B. | Lesser |
| C. | Constant |
| D. | Equal |
| Answer» B. Lesser | |
| 140. |
is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race |
| A. | Casing |
| B. | Guide mechanism |
| C. | Draft tube |
| D. | Runner |
| Answer» C. Draft tube | |
| 141. |
and of radial flow reaction turbine are always full of water. |
| A. | Casing and runner |
| B. | Casing and penstocks |
| C. | Runner and penstocks |
| D. | Runner and draft tube |
| Answer» A. Casing and runner | |
| 142. |
governs the flow of water entering the runner blades. |
| A. | Casing |
| B. | Guide vanes |
| C. | Draft tube |
| D. | Runner |
| Answer» B. Guide vanes | |
| 143. |
Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner_ |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 144. |
Which of following is inward radial flow reaction turbine? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Axial turbine |
| D. | Kaplan turbine |
| Answer» B. Francis turbine | |
| 145. |
In Inward radial flow reaction turbine which is not required? |
| A. | Runner |
| B. | Air tight casing |
| C. | Guide vanes |
| D. | Breaking jet |
| Answer» D. Breaking jet | |
| 146. |
The main difference between reaction turbine and inward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 147. |
In Inward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 148. |
In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» A. Speed ratio | |
| 149. |
In Inward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at outlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» B. Radial outlet discharge | |
| 150. |
In which of following turbine whirl component is zero? |
| A. | Reaction turbine |
| B. | Inward radial flow reaction turbine |
| C. | Axial flow turbine |
| D. | Impulse turbine |
| Answer» B. Inward radial flow reaction turbine | |
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