Lakshmikant Sonvane asked • 3 minutes ago

The overall gear ratio in a 2 stage speed reduction gear box (with all spur gears) is 12. The input and output shafts of the gear box are collinear. The countershaft which is parallel to the input and output shafts has a gear (Z_{2} teeth) and pinion (Z_{3} = 15 teeth) to mesh with pinion (Z_{1} = 16 teeth) on the input shaft and gear (Z_{4 }teeth) on the output shaft respectively. It was decided to use a gear ratio of 4 with 3 module in the first stage and 4 module in the second stage.

The centre distance in the second stage is

- a)90 mm
- b)120 mm
- c)160 mm
- d)240mm

Correct answer is option 'B'. Can you explain this answer?

KESHAV GOYAL asked • 5 minutes ago

A butt welded joint, subjected to tensile force P is shown in the given figure, l = length of the weld (in mm) h = throat of the butt weld (in mm) and H is the total height of weld including reinforcement. The average tensile stress s_{t} in

- a)
- b)
- c)
- d)

Correct answer is option 'B'. Can you explain this answer?

Pooja Shende asked • 9 minutes ago

A refrigeration compressor designed to operate with R 22………. (can/cannot) be operated with R 12 because the condensing pressure of R22 at any give temperature is……..(higher/lower) than that of R 12.

- a)Cannot; Higher
- b)Can; Higher
- c)Canno t; Lower
- d)Can; L ower

Correct answer is option 'A'. Can you explain this answer?

Aadarsh Vikram asked • 30 minutes ago

Assertion (A): The supply of fuel is automatically regulated by governor according to the engine speed.

Reason (R): The automatic function is the application of d' Alembert's principle.

- 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 'C'. Can you explain this answer?

Kuldeep Dhurve asked • 50 minutes ago

The velocity distribution in a viscous flow over a plate is given by

u = 4y – y2

where, u = velocity in m/s at a point distanty fromthe plate. If the coefficient of dynamic viscosityis 1.5 pa.s, What is the shear stress at y = 1m?

- a)3 Pa
- b)3.5 Pa
- c)2.5 Pa
- d)3.3 Pa

Correct answer is option 'A'. Can you explain this answer?

Abhay Tiwari asked • 52 minutes ago

Which one of the following is represented by the area of the S.F diagram from one end upto a given location on the beam?

- a)B.M. at the location
- b)Load at the location
- c)Slope at the location
- d)Deflection at the location

Correct answer is option 'A'. Can you explain this answer?

Kamal Pundir Pundir asked • 57 minutes ago

Kalpesh Bhavsar asked • 1 hour ago

A shaft made from ductile material is subjected to combined bending and twisting moments. Calculations based on which one of the following failure theories would give the most conservative values?

- a)maximum principal stress theory
- b)maximum shear stress theory
- c)maximum strain energy theory
- d)maximum distortion energy theory

Correct answer is option 'B'. Can you explain this answer?

Shahul Hameed asked • 1 hour ago

In a hydropower project a turbine has a head of 50 m. The discharge in the feeding penstock is 3 m^{3}/s. If a head loss of 5 m takes place due to losses, and a power of 1000 kW is extracted, the residual head downstream of the turbine is

- a)45 m
- b)10.95 m
- c)15.95 m
- d)20.95 m

Correct answer is option 'B'. Can you explain this answer?

Sreenath Narayandas asked • 1 hour ago

In the given figure, find the angle at which the ladder loses its contact with the wall before it hits the ground? Assume centre of mass of ladder moves in a circle and friction less ground and wall.

- a)65°
- b)39°
- c)48.2°
- d)52.8°

Correct answer is option 'C'. Can you explain this answer?

Ravi Saini Saini asked • 1 hour ago

A feasible solution to an LP problem

- a)must satisfy all of the problem’s constraints simultaneously
- b)need not satisfy all of the constraints
- c)must be a corner point of the feasible region
- d)must optimize the value of the objective function

Correct answer is option 'A'. Can you explain this answer?

Demon21 Exposed asked • 1 hour ago

A Carnot engine operates between temperature 1000 K and 400 K. The heat rejected by the first Carnot engine is used by the second Carnot engine, whose sink temperature is 200 K. If the net heat absorbed by the first Carnot engine is 200 MJ. What is the heat rejected (in MJ) by the second Carnot engine?

- a)40
- b)50
- c)60
- d)70

Correct answer is option 'A'. Can you explain this answer?

Sravani asked • 1 hour ago

Assertion ( A): I n a practical vapour compression refrigerator, the vapour should leave the evaporator with a definite amount of superheat.

Reason (R): It reduces the work done by the compressor.

- 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 'C'. Can you explain this answer?

Victoria Ndukuba asked • 1 hour ago

In case of solution of a two variable linear programming problems by graphical method, one constraint line comes parallel to the objective function line. Then the problem will have

- a)infeasible solution
- b)unbounded solution
- c)degenerate solution
- d)infinite number of optimal solutions

Correct answer is option 'D'. Can you explain this answer?

Sundar Raj asked • 2 hours ago

Common Data for Questions

Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727°C, the lower plate (plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227°C.

Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady-state conditions to exist. Stefan-Boltzmann constant is given as 5.67 × 10^{-8 }W/m^{2}K^{4}.

Radiative heat transfer is intended between the inner surfaces of two very large isothermal parallel metal plates. While the upper plate (designated as plate 1) is a black surface and is the warmer one being maintained at 727°C, the lower plate (plate 2) is a diffuse and gray surface with an emissivity of 0.7 and is kept at 227°C.

Assume that the surfaces are sufficiently large to form a two-surface enclosure and steady-state conditions to exist. Stefan-Boltzmann constant is given as 5.67 × 10

Gopi Vallabhaneni asked • 2 hours ago

Hot press forging

- a)Causes a steadily applied pressure instead of impact force
- b)Is used to force the end of a heated bar into a desired shape
- c)Is a forging operation in which two halves of a rotating die open and closed rapidly while impacting the end of the heated tube shell
- d)None

Correct answer is option 'A'. Can you explain this answer?

Sreejith K R asked • 2 hours ago

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

Correct answer is option 'B'. Can you explain this answer?

Chinmay Jain asked • 2 hours ago

A cup is drawn in a deep drawing operation. The inside diameter of cup is 100 mm. If sheet thickness and blank diameter is 4 mm and 240 mm respectively then find percentage reduction ________?

- a)58.33
- b)60
- c)66.66
- d)80

Correct answer is option 'A'. Can you explain this answer?

Nirmal Mallick asked • 3 hours ago

The critical point and triple point data for water are

T_{c} = 374 ºC, P_{c} = 22.1 MPa

T_{T} = 0.01 ºC P_{T} = 0.6 KPa

T

T

Indicate the phase change that will occur in following cases:

(i) Ice at 0.5 Kpa is heated isobarically

(ii) Water vapour at 400ºC is compressed isothermally

- a)(i) along AB (ii) along CD
- b)(i) along CD (ii) along AB
- c)(i) along OD (ii) along PR
- d)(i) along RD (ii) along OR

Correct answer is option 'A'. Can you explain this answer?

Manoj Majhi asked • 3 hours ago

Abhishek Govil asked • 3 hours ago

In the design of shafts made of ductile materials subjected to twisting moment and bendingmoment, the recommended theory of failure is

- a)maximum principal stress theory
- b)maximum principal strain theory
- c)maximum shear stress theory
- d)maximum strain – energy theory

Correct answer is option 'C'. Can you explain this answer?

Uma Maheswari Kunchala asked • 3 hours ago

Which 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?

Mani Kanta asked • 3 hours ago

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

Correct answer is option 'C'. Can you explain this answer?

Mohit Rajput asked • 3 hours ago

Which of the following is a proper sequence ?

- a)proportional limit, elastic limit, yielding sequence ?
- b)elastic limit, proportional limit, yielding, failure
- c)yielding, Proportional limit, elastic limit, failure
- d)none of the above

Correct answer is option 'A'. Can you explain this answer?

Tarun Kumar asked • 4 hours ago

Assertion (A): Steel can be melted in hot blast cupola.

Reason (R): In hot blast cupola, the flue gases are used to preheat the air blast to the cupola so that the temperature in the furnace is considerably higher than that in a conventional cupola.

- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R arc true but R is NOT the correct explanation of A
- c)A is true hut R is false
- d)A is false but R is true

Correct answer is option 'A'. Can you explain this answer?

Ujjwal Sonewane asked • 4 hours ago

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

- a)higher than the surface of liquid
- b)the same as the surface of liquid
- c)lower than the surface of liquid
- d)unpredictable
- e)none of the above

Correct answer is option 'C'. Can you explain this answer?

Al Hashim Kp asked • 4 hours ago

300 kJ/s of heat is supplied at a constant fixed temperature of 290°C to a heat engine. The heat rejection takes place at 8.5°C. Then match the following

**Results obtained ** **Cycle**

A. 215 kJ/s are rejected 1. reversible

B. 150 kJ/s are rejected 2. irreversible

C. 75kJ/s are rejected 3. impossible

**Codes:**

A B C

(a) 1 2 3

(b) 2 1 3

(c) 3 2 1

A. 215 kJ/s are rejected 1. reversible

B. 150 kJ/s are rejected 2. irreversible

C. 75kJ/s are rejected 3. impossible

A B C

(a) 1 2 3

(b) 2 1 3

(c) 3 2 1

- a)(a)
- b)(b)
- c)(c)
- d)(d)

Correct answer is option 'B'. Can you explain this answer?

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