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Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1


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20 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series | Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 below.
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Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 1

Assertion (A): If a cube is placed in a liquid with two of its surfaces parallel to the free surface of the liquid, then the pressures on the two surfaces which are parallel to the freesurface, are the same. 
Reason (R): Pascal's law states that when a fluid is at rest, the pressure at any plane is the same in all directions.

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 1

Ans. (d)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 2

The reading of the pressure gauge fitted on a vessel is 25 bar.The atmospheric pressure is 1.03 bar and the value of g is9.81m/s2. The absolute pressure in the vessel is: 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 2

Ans. (c) Absolute pressure = Atmospheric pressure + Gauge Pressure = 25+1.03 = 26.03 bar

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 3

Which one of the following pairs is not correctly matched? 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 3

Ans. (d) External diffuser is creating centrifugal head.

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 4

For pumping molasses, it is preferable to employ  

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 4

Ans. (c)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 5

Air vessel is used in a reciprocating pump to obtain 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 5

Ans. (c)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 6

If a reciprocating pump having a mechanical efficiency of 80% delivers water at the rate of 80 kg/s with a head of 30 m, the brake power of thepump is: 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 6

Ans. (a)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 7

Match List-I (Type of pumps) with List-II (Associated features) and select the correct answer using the codes given below the Lists:


Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 7

Ans. (d)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 8

Whenever a plate is submerged at an angle with the direction of flow ofliquid, it is subjected to some pressure. What is the component of thispressure in the direction of flow of liquid, known as?  

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 8

Ans. (c)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 9

The drag force exerted by a fluid on a body immersed in the fluid is dueto: 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 9

Ans. (a)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 10

Which one of the following causes lift on an immersed body in a fluidstream? 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 10

Ans. (d)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 11

Match List-I with List-II and select the correct answer:


  

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 11

Ans. (c) In non-dimensional form, the vortex shedding frequency is expressed as as
the Strouhal number named after V. Strouhal, a German physicist who experimented with wires singing in the wind. The Strouhal number shows a slight but continuous variation with Reynolds number around a value of 0.21.

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 12

Direction of flow, drag force is essentially a function of the Reynoldsnumber of the flow. 
Reason (R): As Reynolds Number is about 100 and above, eddies formedbreak away from either side in periodic fashion, forming a meanderingstreet called the Karman Vortex street.

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 12

Ans. (a) Both A and R are true and R provides a correct explanation of A.

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 13

When pressure drag over a body is large as compared to the friction drag, then the shape of the body is that of: 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 13

Ans. (d)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 14

The critical value of Mach number for a subsonic airfoil is associatedwith sharp increase in drag due to local shock formation and itsinteraction with the boundary layer. A typical value of this criticalMach number is of the order of: 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 14

Ans. (c) The critical Mach number is defined as free stream Mach number at which Sonic flow (M = 1) is first achieved on the airfoil surface. Critical value of mach number for a subsonic airfoil is 1.1 to 1.3.

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 15

Assertion (A): A body with large curvature causes a larger pressure drag and, therefore, larger resistance to motion.  
Reason (R): Large curvature diverges the stream lines, decreases the velocity resulting in the increase in pressure and development of adverse pressure gradient leading to reverse flow near the boundary.

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 15

Ans. (a)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 16

Consider the following coefficients: (Re = Reynolds number)
1. 1.328 Re_ (0.5) for laminar flow
2. 2.072 Re_ (0.2) for turbulent flow
3. 0.072 Re _ (0.2) for turbulent flow
4. 1.028 Re _ (0.5) for laminar flow
The coefficient of drag for a flat would include

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 16

Ans. (c)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 17

The Magnus effect is defined as 

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 17

Ans. (d)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 18

An automobile moving at a velocity of 40 km/hr is experiencing a wind resistance of 2 kN. If the automobile is moving at a velocity of 50 km/hr,the power required to overcome the wind resistance is:  

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 18

Ans. (a) Power,




= 43.4 kw

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 19

Improved streaming produces 25% reduction in the drag coefficient of a torpedo. When it is travelling fully submerged and assuming the driving power to remain the same, the crease in speed will be:

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 19

Ans. (a)

Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 20

A parachutist has a mass of 90 kg and a projected frontal area of 0.30m2 in free fall. The drag coefficient based on frontal area is found to be 0.75. If the air density is 1.28 kg/m3, the terminal velocity of the parachutist will be:  

Detailed Solution for Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Question 20

Ans. (b)
Total Drag (FD) = Weight (W)
or 

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