Question 1 |

For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively

100 MPa and 5 | |

250 MPa and 5 | |

100 MPa and 0.20 | |

250 MPa and 0.20 |

Question 1 Explanation:

\sigma_{a}=\frac{\sigma_{\max }-\sigma_{\min }}{2}=\frac{250-50}{2}=100 \mathrm{MPa}

\text{Stress ratio }=\frac{\sigma _{max}}{\sigma _{min}}=\frac{50}{250}=0.2

\text{Stress ratio }=\frac{\sigma _{max}}{\sigma _{min}}=\frac{50}{250}=0.2

Question 2 |

For the same material and the mass, which of the following configurations of flywheel will have maximum mass moment of inertia about the axis of rotation OO' passing through the center of gravity.

A | |

B | |

C | |

D |

Question 2 Explanation:

I=m r^{2}

Here for the rimmed wheel, the mass m will be most far away distribution from the axis 0-0.

\therefore \;(B) is the correct answer.

Here for the rimmed wheel, the mass m will be most far away distribution from the axis 0-0.

\therefore \;(B) is the correct answer.

Question 3 |

A gear train is made up of five spur gears as shown in the figure. Gear 2 is driver and gear 6 is driven member. N_{2},N_{3}, N_{4}, N_{5} and N_{6} represent number of teeth on gears 2, 3, 4, 5, and 6 respectively. The gear(s) which act(s) as idler(s) is/are

Only 3 | |

Only 4 | |

Only 5 | |

Both 3 and 5 |

Question 3 Explanation:

Only 5

Question 4 |

In the figure, link 2 rotates with constant angular velocity \omega _{2}. A slider link 3 moves outwards with a constant relative velocity V _{Q/P}, where Q is a point on slider 3 and P is a point on link 2. The magnitude and direction of Coriolis component of acceleration is given by

2w_{2} V_{Q/P} ; direction of V_{Q/P} rotated by 90^{\circ}
in the direction of w_{2} | |

w_{2} V_{Q/P} ; direction of V_{Q/P} rotated by 90^{\circ}
in the direction of w_{2} | |

2w_{2} V_{Q/P} ; direction of V_{Q/P} rotated by 90^{\circ}
opposite to the direction of w_{2} | |

w_{2} V_{Q/P} ; direction of V_{Q/P} rotated by 90^{\circ}
opposite to the direction of w_{2} |

Question 4 Explanation:

Direction is obtained by rotating velocity vector through 90.

Question 5 |

The strain hardening exponent n of stainless steel SS 304 with distinct yield and UTS values undergoing plastic deformation is

n \lt
0 | |

n = 0 | |

0 \lt
n \lt
1 | |

n = 1 |

Question 5 Explanation:

The value of strain hardening constant (n) lies between 0 and 1

n = 0 means material is perfectly plastic solid

n = 1 means material is perfectly elastic solid

n = 0 means material is perfectly plastic solid

n = 1 means material is perfectly elastic solid

Question 6 |

In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is

cylindrical | |

helical | |

plane | |

surface of revolution |

Question 6 Explanation:

Generatrix:- In geometry, generotrix or generator is a point, curve or surface that, when moved generates a new shape

Directrix- The path of generatrix motion is called directrix Table showing generatrix and directrix of various curves

\begin{matrix} &\text{Generatrix}& \text{Directrix}\\ \text{Cylindrical surfaces} &\text{Straight line} &\text{Fixed curve}\\ \text{Helicel surfaces} &\text{Curve} &\text{Straight line}\\ \text{Plane} &\text{Straight line} &\text{Straight line}\\ \text{Surface of revolution }&\text{Plane curve} &\text{Fixed curve}\\ \end{matrix}

Directrix- The path of generatrix motion is called directrix Table showing generatrix and directrix of various curves

\begin{matrix} &\text{Generatrix}& \text{Directrix}\\ \text{Cylindrical surfaces} &\text{Straight line} &\text{Fixed curve}\\ \text{Helicel surfaces} &\text{Curve} &\text{Straight line}\\ \text{Plane} &\text{Straight line} &\text{Straight line}\\ \text{Surface of revolution }&\text{Plane curve} &\text{Fixed curve}\\ \end{matrix}

Question 7 |

In full mould (cavity-less) casting process, the pattern is made of

expanded polystyrene | |

wax | |

epoxy | |

plaster of paris |

Question 7 Explanation:

The pattern is made of expanded polystrene.

In the expanded polystyrene casting process, a sand mold is packed around a polystyrene pattern representing the metal casting to be manufactured. The pattern is not removed, and the molten metal is poured into the pattern which is vaporized from the heat of the metal. The liquid metal takes the place of the vaporized polystyrene and the casting solidifies in the sand mold.

In the expanded polystyrene casting process, a sand mold is packed around a polystyrene pattern representing the metal casting to be manufactured. The pattern is not removed, and the molten metal is poured into the pattern which is vaporized from the heat of the metal. The liquid metal takes the place of the vaporized polystyrene and the casting solidifies in the sand mold.

Question 8 |

In the notation (a/b/c) : (d/e/f) for summarizing the characteristics of queueing situation, the letters 'b' and 'd' stand respectively for

service time distribution and queue discipline | |

number of servers and size of calling source | |

number of servers and queue discipline | |

service time distribution and maximum number allowed in system |

Question 8 Explanation:

The general form of notation is

(a/b/c) : (d/e/f)

where,

a : Probability distribution for arrival pattern

b : departure (or service time) distribution

c : No. of server within system

d : service discipline

e : Size and capacity of system

f : Size or capacity of calling population

(a/b/c) : (d/e/f)

where,

a : Probability distribution for arrival pattern

b : departure (or service time) distribution

c : No. of server within system

d : service discipline

e : Size and capacity of system

f : Size or capacity of calling population

Question 9 |

Couette flow is characterized by

steady, incompressible, laminar flow through a straight circular pipe | |

fully developed turbulent flow through a straight circular pipe | |

steady, incompressible, laminar flow between two fixed parallel plates | |

steady, incompressible, laminar flow between one fixed plate and the other moving with a constant velocity |

Question 9 Explanation:

Couette flow

In fluid dynamics, couette flow is the laminar flow of a viscous fluid in the space between two parallel plates, one of which is moving relative to the other. The flow is driven by virtue of viscous drag force acting on the fluid and the applied pressure gradient parallel to the plates.

In fluid dynamics, couette flow is the laminar flow of a viscous fluid in the space between two parallel plates, one of which is moving relative to the other. The flow is driven by virtue of viscous drag force acting on the fluid and the applied pressure gradient parallel to the plates.

Question 10 |

The thermodynamic cycle shown in figure (T-s diagram) indicates

reversed Carnot cycle | |

reversed Brayton cycle | |

vapor compression cycle | |

vapor absorption cycle |

Question 10 Explanation:

Reversed Brayton cycle is shown in the figure.

There are 10 questions to complete.