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Worksheets

SMARTINIS

Total questions: 26

Worksheet time: 14mins

Name
Class
Date
1.

Which method of development is employed in case of cones?

a)

Parallel-line development

b)

Approximation method

c)

Triangulation development

d)

Radial-line development

2.

Which method of development is employed in case of prisms?

a)

Parallel-line development

b)

Approximation method

c)

Triangulation development

d)

1. Radial-line development

3.

A regular cone is placed such that axis is perpendicular to H.P and the section plane is inclined to axis and parallel to one of the generators then the section will be

a)

ellipse

b)

hyperbola

c)

parabola

d)

triangle

4.

1. Consider steady laminar incompressible anti-symmetric fully developed viscous flow through a straight circular pipe of constant cross-sectional area at a Reynolds number of 5. The ratio of inertia force to viscous force on a fluid particle is___________

a)

5

b)

1/5

c)

0

d)

3

5.

A ball bearing operating at a load F has 8000 hours of life. The life of the bearing, in hours, when the load is doubled to 2F is ______________

a)

8000

b)

6000

c)

4000

d)

1000

6.

If a particular Fe-C alloy contains less than 0.83% carbon, it is called__________

a)

 high speed steel

b)

hypoeutectoid steel  

c)

 hypereutectoid steel

d)

 cast iron

7.

Which of the following engineering materials is the most suitable candidate for hot chamber die casting ?

a)

low carbon steel

b)

titanium   

c)

copper

d)

tin

8.

Which one of the following is a solid state joining process ?

a)

gas tungsten arc welding

b)

 resistance spot welding

c)

friction welding

d)

submerged arc welding

9.

Which type of motor is NOT used in axis or spindle drives of CNC machine tools ?

a)

induction motor

b)

 DC servo motor

c)

stepper motor

d)

 linear servo motor

10.

A calculator has accuracy up to 8 digits after decimal place. The value of , when evaluated using the calculator by trapezoidal method with 8 equal intervals, to 5 significant digits is

a)

0.00000

b)

1.0000

c)

0.00500

d)

0.00025

11.

 As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are

a)

Francis, Kaplan, Pelton

b)

Kaplan, Francis, Pelton

c)

Pelton, Kaplan, Francis

d)

Pelton, Francis, Kaplan

12.

Consider an ideal vapor compression refrigeration cycle. If the throttling process is replaced by an isentropic expansion process, keeping all the other processes unchanged, which one of the following statements is true for the modified cycle?

a)

Coefficient of performance is the same as that of the original cycle

b)

Coefficient of performance is lower than that of the original cycle

c)

Refrigerating effect is lower than that of the original cycle

d)

Coefficient of performance is higher than that of the original cycle

13.

Water has a critical specific volume of 0.003155m3/kg. A closed and rigid steel tank of volume 0.025m3 contains a mixture of water and steam at 0.1MPa. The mass of the mixture is 10 kg. The tank is now slowly heated. The liquid level inside the tank

a)

will rise

b)

 will fall

c)

will remain constant

d)

may rise or fall depending on the amount of heat transferred

14.

A gas is heated in a duct as it flows over a resistance heater. Consider a 101 kW electric heating system. The gas enters the heating section of the duct at 100 kPa and 27°C with a volume flow rate of 15m3/s. If heat is lost from the gas in the duct to the surroundings at a rate of 51kW, the exit temperature of the gas is (a)  

(Assume constant pressure, ideal gas, negligible change in kinetic and potential energies and constant specific heat; Cp = 1 kJ/kg.K; R = 0.5 kJ/kg.K).

15.

Consider an incompressible laminar boundary layer flow over a flat plate of length L, aligned with the direction of an incoming uniform free stream. If F is the ratio of the drag force on the front half of the plate to the drag force on the rear half, then

a)

F < 1/2

b)

F = 1/2

c)

F = 1

d)

F > 1

16.

 Consider steady laminar incompressible anti-symmetric fully developed viscous flow through a straight circular pipe of constant cross-sectional area at a Reynolds number of 5. The ratio of inertia force to viscous force on a fluid particle is

a)

5

b)

1/5

c)

0

d)

3

17.

limx0\lim_{x\rightarrow0} exe^x (1+x+ x2x^2 /2) / x3x^3

a)

1/9

b)

1/6

c)

9

d)

6

18.

The number of linearly independent eigen vectors of 2 10  2\lceil2\ 1\rceil\lfloor0\ \ 2\rfloor  is _________________

a)

0

b)

1

c)

2

d)

infinite

19.

In a counter flow heat exchanger, hot fluid enters at 60°C and cold fluid leaves at 30°C. Mass flow rate of the fluid is 1 kg/s and that of the cold fluid is 2 kg/s. Specific heat of the hot fluid is 10 kJ/kgK and that of the cold fluid is 5 kJ/kgK. The Log Mean Temperature Difference (LMTD) for the heat exchanger in °C is___________________

a)

15

b)

30

c)

35

d)

45

20.

The stroke and bore of a four-stroke spark ignition engine are 250 mm and 200 mm respectively. The clearance volume is 0.001m3. If the specific heat ratio = 1.4, the air-standard cycle efficiency of the engine is________________

a)

46.40%

b)

56.10%

c)

58.20%

d)

62.80%

21.

If a2a^2 + b2b^2 + c2c^2 = 1, Then 𝑎𝑏 + 𝑏𝑐 + 𝑎𝑐 lies in the interval

a)

[1, 2/3]

b)

[-1/2, 1]

c)

[-1, ½]

d)

[2, -4]

22.

The relative humidity of ambient air at 300 K is 50% with a partial pressure of water vapour

equal to 𝑝𝑣. The saturation pressure of water at 300 K is 𝑝𝑠𝑎𝑡 . The correct relation for the air –

water mixture is

a)

P𝑣 = 0.5 P𝑠𝑎𝑡

b)

P𝑣 = 0.622 P𝑠𝑎t

c)

P𝑣 = P𝑠𝑎𝑡

d)

P𝑣 = 2 Ps𝑎t

23.

For an ideal gas with constant values of specific heats, for calculation of the specific enthalpy,_____

a)

it is sufficient to know only the temperature

b)

both temperature and pressure are required to be known

c)

both temperature and volume are required to be known

d)

both temperature and mass are required to be known

24.

In a refrigeration system, the expansion device is connected between the (a)  

25.

In actual air-conditioning applications for R-12 and R-22, and operating at a condenser

temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

________________________

a)

1

b)

1.12

c)

2.15

d)

5.12

26.

The value of limx0\lim_{x\rightarrow0} (1cos x)x2\frac{\left(1-\cos\ x\right)}{x^2} is

a)

1/2

b)

-1/2

c)

1

d)

2