Mechanical Engineering
محمد القدومي asked • 19 minutes agoEfficient operation of catalytic converters require maintenance of
1. temperature
2. equivalence ratio
3. pressure
4. direction of exhaust flow
Q. Select the correct statements from above:- a)1 and 2
- b)1, 2 and 3
- c)2, 3 and 4
- d)1 and 4
Correct answer is option 'A'. Can you explain this answer?
Efficient operation of catalytic converters require maintenance of
1. temperature
2. equivalence ratio
3. pressure
4. direction of exhaust flow
Q. Select the correct statements from above:
1. temperature
2. equivalence ratio
3. pressure
4. direction of exhaust flow
Q. Select the correct statements from above:
a)
1 and 2
b)
1, 2 and 3
c)
2, 3 and 4
d)
1 and 4
Dibyani Lahon asked • 26 minutes agoA solid cylinder (surface 2) is located at the centre of a hollow sphere (surface 1). The diameter of the sphere is 1 m, while the cylinder has a diameter and length of 0.5 m each. The radiation configuration factor F11 is- a)0.375
- b)0.625
- c)0.75
- d)1
Correct answer is option 'B'. Can you explain this answer?
A solid cylinder (surface 2) is located at the centre of a hollow sphere (surface 1). The diameter of the sphere is 1 m, while the cylinder has a diameter and length of 0.5 m each. The radiation configuration factor F11 is
a)
0.375
b)
0.625
c)
0.75
d)
1
Kavyashree K asked • 58 minutes agoTwo identical cantilever beams are supported as shown, with their free ends in contact through a rigid roller. After the load Pis applied, the free ends will have
- a)equal deflections but not equal slopes
- b)equal slopes but not equal deflections
- c)equal slopes as well as equal deflections
- d)neither equal slopes nor equal deflections
Correct answer is option 'A'. Can you explain this answer?
Two identical cantilever beams are supported as shown, with their free ends in contact through a rigid roller. After the load Pis applied, the free ends will have
a)
equal deflections but not equal slopes
b)
equal slopes but not equal deflections
c)
equal slopes as well as equal deflections
d)
neither equal slopes nor equal deflections
Swapnali Jagdale asked • 1 hour agoAssertion (A): The precession of the axis of rotation of a shaft causes a gyroscopic reaction couple to act on the frame to which the bearings are fixed.Reason (R): The reaction of the shaft on each bearing is equal and opposite to the action of the bearing on the shaft. - a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The precession of the axis of rotation of a shaft causes a gyroscopic reaction couple to act on the frame to which the bearings are fixed.
Reason (R): The reaction of the shaft on each bearing is equal and opposite to the action of the bearing on the shaft.
a)
Both A and R are individually true and R is the correct explanation of A
b)
Both A and R are individually true but R is not the correct explanation of A
c)
A is true but R is false
d)
A is false but R is true
Aadarsh Vikram asked • 1 hour agoConsider the following two processes:a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 Kb. A heat source at 800 K loses 2000 kJ of heat to sink at 500 KWhich of the following statements is TRUE?- a)Process I is more irreversible than Process II
- b)Process II is more irreversible than Process I
- c)Irreversibility associated in both the processes is equal
- d)Both the processes are reversible
Correct answer is option 'B'. Can you explain this answer?
Consider the following two processes:
a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 K
b. A heat source at 800 K loses 2000 kJ of heat to sink at 500 K
Which of the following statements is TRUE?
a)
Process I is more irreversible than Process II
b)
Process II is more irreversible than Process I
c)
Irreversibility associated in both the processes is equal
d)
Both the processes are reversible
Sreejith K R asked • 2 hours agoWhich of the following pairs are correctly matched?
1. Piezometric head : Sum of datum head and pressure head
2. Dynamic head : Sum of datum head and velocity head
3. Stagnation head : Sum of piezometric head and velocity head
4. Total head : Sum of piezometric head and dynamic head- a)1,2 and 3
- b)1,3 and 4
- c)1,2 and 4
- d)2, 3 and 4
Correct answer is option 'B'. Can you explain this answer?
Which of the following pairs are correctly matched?
1. Piezometric head : Sum of datum head and pressure head
2. Dynamic head : Sum of datum head and velocity head
3. Stagnation head : Sum of piezometric head and velocity head
4. Total head : Sum of piezometric head and dynamic head
1. Piezometric head : Sum of datum head and pressure head
2. Dynamic head : Sum of datum head and velocity head
3. Stagnation head : Sum of piezometric head and velocity head
4. Total head : Sum of piezometric head and dynamic head
a)
1,2 and 3
b)
1,3 and 4
c)
1,2 and 4
d)
2, 3 and 4
Yangthrili Sangtam asked • 2 hours agoWhich one of the following is correct? - a)The turbine used in gas turbine power plant is larger than that used in steam power plants.
- b)The turbine used in gas turbine power plants is smaller than that used in steam power plants.
- c)The same turbine can be used for both plants.
- d) None of the above
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is correct?
a)
The turbine used in gas turbine power plant is larger than that used in steam power plants.
b)
The turbine used in gas turbine power plants is smaller than that used in steam power plants.
c)
The same turbine can be used for both plants.
d)
None of the above
Raju Rakoti asked • 2 hours agoA hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then- a)t1 = t2 = t3
- b)t1 < t2 < t3
- c)t1 > t2 > t3
- d)t1, t2, t3 will depend upon material of hot piece.
Correct answer is option 'B'. Can you explain this answer?
A hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then
a)
t1 = t2 = t3
b)
t1 < t2 < t3
c)
t1 > t2 > t3
d)
t1, t2, t3 will depend upon material of hot piece.
Sreenath Narayandas asked • 2 hours agoA small maintenance project consists of the following 10 jobs, whose precedence, relationships are identified by their node numbers:
Q.What is the earliest and latest start and finish times for job F?- a) [7, 13] [7, 13]
- b) [7, 14] [7, 15]
- c) [7, 9] [14, 16]
- d) [9, 17] [12, 20]
Correct answer is option 'A'. Can you explain this answer?
A small maintenance project consists of the following 10 jobs, whose precedence, relationships are identified by their node numbers:
Q.
What is the earliest and latest start and finish times for job F?
a)
[7, 13] [7, 13]
b)
[7, 14] [7, 15]
c)
[7, 9] [14, 16]
d)
[9, 17] [12, 20]
Aadarsh Vikram asked • 3 hours agoA gear set has a pinion with 20 teeth and a gear with 40 teeth. The pinion runs at 30 rev/s and transmits a power of 20 kW. The teeth are on the 20c full-depth system and have a module of 5 mm. The length of the line of action is 19 mm.Q. The center distance for the above gear set in mm is- a)140
- b)150
- c)160
- d)170
Correct answer is option 'B'. Can you explain this answer?
A gear set has a pinion with 20 teeth and a gear with 40 teeth. The pinion runs at 30 rev/s and transmits a power of 20 kW. The teeth are on the 20c full-depth system and have a module of 5 mm. The length of the line of action is 19 mm.
Q. The center distance for the above gear set in mm is
a)
140
b)
150
c)
160
d)
170
Mani Kanta asked • 3 hours agoA spur gear has a module of 3 mm, number of teeth 16, a face width of 36 mm and a pressure angle of 20°. It is transmitting a power of 3 kW at 20 rev/s. Taking a velocity factor of 1.5, and a form factor of 0.3, the stress in the gear tooth is about- a)32 MPa
- b)46 MPa
- c)58 MPa
- d)70 MPa
Correct answer is option 'C'. Can you explain this answer?
A spur gear has a module of 3 mm, number of teeth 16, a face width of 36 mm and a pressure angle of 20°. It is transmitting a power of 3 kW at 20 rev/s. Taking a velocity factor of 1.5, and a form factor of 0.3, the stress in the gear tooth is about
a)
32 MPa
b)
46 MPa
c)
58 MPa
d)
70 MPa
Chandan Patel 007 asked • 3 hours agoIn carrying out a work sampling study in a machine shop, it was found that a particular lathe was down for 20% of the time. What would be the 95% confidence interval of this estimate if 100 observations were made? - a)0.16, 0.24
- b)0.12, 0.28
- c)0.08, 0.32
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
In carrying out a work sampling study in a machine shop, it was found that a particular lathe was down for 20% of the time. What would be the 95% confidence interval of this estimate if 100 observations were made?
a)
0.16, 0.24
b)
0.12, 0.28
c)
0.08, 0.32
d)
None of these
Mr. Bhavin Makwana asked • 3 hours agoIn the grain -size determination using standard charts, the relation between the given size number n and the average number of grains 'N' per square inch at a magnification of 100 X is- a)N = 2n
- b)N = 2n-1
- c)N = 2n + 1
- d)N = 2n + 1
Correct answer is option 'B'. Can you explain this answer?
In the grain -size determination using standard charts, the relation between the given size number n and the average number of grains 'N' per square inch at a magnification of 100 X is
a)
N = 2n
b)
N = 2n-1
c)
N = 2n + 1
d)
N = 2n + 1
Tanuja Kumari asked • 3 hours agoThe discharge through a large rectangular orifice is given bywhere H1= Height of the liquid above the top of the orifice,
H2= Height of the liquid abvoe the bottom of the orifice,
b = Breadth of the orifice, and
Cd= Coefficient of discharge- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
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 abvoe the bottom of the orifice,
b = Breadth of the orifice, and
Cd= Coefficient of discharge
H2= Height of the liquid abvoe the bottom of the orifice,
b = Breadth of the orifice, and
Cd= Coefficient of discharge
a)
b)
c)
d)
Uma Maheswari Kunchala asked • 3 hours agoWhich one of following is NOT correct?- a)Intermediate principal stress is ignored when applying the maximum principal stress
theory - b)The maximum shear stress theory gives the most accurate results amongst all the failure
theories - c)As per the maximum strain energy theory, failure occurs when the strain energy per unit
volume exceeds a critical value - d)As per the maximum distortion energy theory, failure occurs when the distortion energy
per unit volume exceeds a critical value
Correct answer is option 'B'. Can you explain this answer?
Which one of following is NOT correct?
a)
Intermediate principal stress is ignored when applying the maximum principal stress
theory
theory
b)
The maximum shear stress theory gives the most accurate results amongst all the failure
theories
theories
c)
As per the maximum strain energy theory, failure occurs when the strain energy per unit
volume exceeds a critical value
volume exceeds a critical value
d)
As per the maximum distortion energy theory, failure occurs when the distortion energy
per unit volume exceeds a critical value
per unit volume exceeds a critical value
Mahesh Kumar asked • 3 hours agoThe use of Refrigerant R–22 for temperature below – 30º is not recommended due to its- a)good miscibility with lubricating oil
- b)poor miscibility with lubricating oil
- c)low evaporating temperature
- d)high compressor discharge temperature
Correct answer is option 'D'. Can you explain this answer?
The use of Refrigerant R–22 for temperature below – 30º is not recommended due to its
a)
good miscibility with lubricating oil
b)
poor miscibility with lubricating oil
c)
low evaporating temperature
d)
high compressor discharge temperature
Jayananda Dehury asked • 3 hours agoWorm working or semi-hot working process, which is the plastic deformation of metal or alloy under conditions of temperature and strain rate, is performed to eliminate drawbacks of - a) cold working process
- b) hot working process
- c) both cold and hot working processes
- d) none of the above
Correct answer is option 'C'. Can you explain this answer?
Worm working or semi-hot working process, which is the plastic deformation of metal or alloy under conditions of temperature and strain rate, is performed to eliminate drawbacks of
a)
cold working process
b)
hot working process
c)
both cold and hot working processes
d)
none of the above
Nagendra Nagulla asked • 3 hours agoLet S1 be the plane figure consisting of the points (x,y) given by the inequalities |x - 1|≤2 and |y+2|≤ 3. Let S2 be the plane figure given by the inequalities x - y ≥ -2, y ≥1, and x ≤3 Let S be the union of S1 and S2. The area of S is.- a)26
- b)28
- c)32
- d)34
Correct answer is option 'C'. Can you explain this answer?
Let S1 be the plane figure consisting of the points (x,y) given by the inequalities |x - 1|≤2 and |y+2|≤ 3. Let S2 be the plane figure given by the inequalities x - y ≥ -2, y ≥1, and x ≤3 Let S be the union of S1 and S2. The area of S is.
a)
26
b)
28
c)
32
d)
34
Aadarsh Vikram asked • 3 hours agoIf a two-mass system is dynamically equivalent to a rigid body, then the system will NOT satisfy the condition that the - a)Sum of the two masses must be equal to that of the rigid body
- b)Polar moment of inertia of the system should be equal to that of the rigid body
- c)Centre of gravity (c.g.) of the system should coincide with that of the rigid body
- d)Total moment of inertia about the axis through c.g. must be equal to that of the rigid body
Correct answer is option 'D'. Can you explain this answer?
If a two-mass system is dynamically equivalent to a rigid body, then the system will NOT satisfy the condition that the
a)
Sum of the two masses must be equal to that of the rigid body
b)
Polar moment of inertia of the system should be equal to that of the rigid body
c)
Centre of gravity (c.g.) of the system should coincide with that of the rigid body
d)
Total moment of inertia about the axis through c.g. must be equal to that of the rigid body
Pooja Shende asked • 4 hours agoA 400 mm diameter shaft is rotating at 200 rpm in a bearing of length 120 mm. If the thickness of oil film is 1.5 mm and the dynamic viscosity of the oil is 0.7 Ns/m2 determine:
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;Correct answer is 'Ans. (i) 58.97 Nm (ii) 1.235 kW'. Can you explain this answer?
A 400 mm diameter shaft is rotating at 200 rpm in a bearing of length 120 mm. If the thickness of oil film is 1.5 mm and the dynamic viscosity of the oil is 0.7 Ns/m2 determine:
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;
(i) Torque required overcoming friction in bearing;
(ii) Power utilization in overcoming viscous resistance;
Akshay Jadhav asked • 4 hours agoIn an assembly line, when the workstation times are unequal, the overall production rate of an assembly line is determined by the: - a)Fastest station time
- b)Slowest station time
- c)Average of all station times
- d)Average of slowest and fastest station times
Correct answer is option 'B'. Can you explain this answer?
In an assembly line, when the workstation times are unequal, the overall production rate of an assembly line is determined by the:
a)
Fastest station time
b)
Slowest station time
c)
Average of all station times
d)
Average of slowest and fastest station times
Sanjay Rewad asked • 4 hours agoThe coating material of an arc welding electrode contains which of the following? 1. Deoxidising agent 2. Arc stabilizing agent 3. Slag forming agentSelect the correct answer using the code given below: - a)1, 2 and 3
- b)1 and 2 only
- c)2 and 3 only
- d)1 and 3 only
Correct answer is option 'A'. Can you explain this answer?
The coating material of an arc welding electrode contains which of the following?
1. Deoxidising agent
2. Arc stabilizing agent
3. Slag forming agent
Select the correct answer using the code given below:
a)
1, 2 and 3
b)
1 and 2 only
c)
2 and 3 only
d)
1 and 3 only
Vipin Kumar asked • 4 hours agoMatch List-I (Theory of Failure) with List-II (Predicted Ratio of Shear Stress to Direct Stress at yield Condition for Steel Specimen) select the correct answer using the code given below the lists:
- a)A
- b)B
- c)C
- d)D
Correct answer is option 'B'. Can you explain this answer?
Match List-I (Theory of Failure) with List-II (Predicted Ratio of Shear Stress to Direct Stress at yield Condition for Steel Specimen) select the correct answer using the code given below the lists:
a)
A
b)
B
c)
C
d)
D
Navdeep Jadoun asked • 4 hours agoKey concept in analyzing the filling of an evacuated tank is- a)the mass flow rate in the tank remains constant
- b)the enthalpy across the valve remains constant
- c)the internal energy in the tank remains constant
- d)the temperature in the tank remains constant
Correct answer is option 'B'. Can you explain this answer?
Key concept in analyzing the filling of an evacuated tank is
a)
the mass flow rate in the tank remains constant
b)
the enthalpy across the valve remains constant
c)
the internal energy in the tank remains constant
d)
the temperature in the tank remains constant
Vishal Dhiman asked • 4 hours agoA Pitot tube is used to measure the velocity of water in a pipe. The stagnation pressure head is 6 m and the static pressure head is 5 m. If the coefficient of tube is 0.98, then what is the velocity of flow?- a)4.34 m/s
- b)9.70 m/s
- c)10.63 m/s
- d)14.70 m/s
Correct answer is option 'A'. Can you explain this answer?
A Pitot tube is used to measure the velocity of water in a pipe. The stagnation pressure head is 6 m and the static pressure head is 5 m. If the coefficient of tube is 0.98, then what is the velocity of flow?
a)
4.34 m/s
b)
9.70 m/s
c)
10.63 m/s
d)
14.70 m/s
Aadarsh Vikram asked • 5 hours agoThe bending moment diagram for a simply supported beam is a rectangle over a larger portion of the span except near the supports. What type of load does the beam carry?- a)A uniformly distributed symmetrical load over a larger portion of the span except near the supports
- b)A concentrated load at mid-span
- c)Two identical concentrated loads equidistant from the supports and close to mid-point of the beam
- d)Two identical concentrated loads equidistant from the mid-span and close to supports
Correct answer is option 'D'. Can you explain this answer?
The bending moment diagram for a simply supported beam is a rectangle over a larger portion of the span except near the supports. What type of load does the beam carry?
a)
A uniformly distributed symmetrical load over a larger portion of the span except near the supports
b)
A concentrated load at mid-span
c)
Two identical concentrated loads equidistant from the supports and close to mid-point of the beam
d)
Two identical concentrated loads equidistant from the mid-span and close to supports
Shafiq Sayyad Sayyad asked • 5 hours agoStress concentration factor is defined as the ratio of- a)maximum stress to the endurance limit
- b)nominal stress to the enurance limit
- c)maximum stress to the nominal stress
- d)nominal stress to the maximum stress
Correct answer is option 'C'. Can you explain this answer?
Stress concentration factor is defined as the ratio of
a)
maximum stress to the endurance limit
b)
nominal stress to the enurance limit
c)
maximum stress to the nominal stress
d)
nominal stress to the maximum stress
Bidhan Das asked • 5 hours agoThe jet ratio is defined as the ratio of the- a)diameter of jet to the diameter of Pelton wheel
- b)velocity of jet to the velocity of Pelton wheel
- c)diameter of Pelton wheel to the diameter of jet
- d)velocity of Pelton wheel to the velocity turbine?
Correct answer is option 'C'. Can you explain this answer?
The jet ratio is defined as the ratio of the
a)
diameter of jet to the diameter of Pelton wheel
b)
velocity of jet to the velocity of Pelton wheel
c)
diameter of Pelton wheel to the diameter of jet
d)
velocity of Pelton wheel to the velocity turbine?
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