exercise 2€¦ · 2019-09-11 · e flywheel e spring m inclined p g constan 2 i ross‐secti unit...
TRANSCRIPT
Exercise 2
1. One of the eigenvectors of the matrix 5 29 6
−⎡ ⎤⎢ ⎥−⎣ ⎦
is
(A) 1
1−⎧ ⎫
⎨ ⎬⎩ ⎭
(B) 2
9−⎧ ⎫
⎨ ⎬⎩ ⎭
(C) 21
⎧ ⎫⎨ ⎬−⎩ ⎭
(D) 11
⎧ ⎫⎨ ⎬⎩ ⎭
2. ( )2
0
1sin 4
x
x
eLtx→
⎛ ⎞−⎜ ⎟⎜ ⎟⎝ ⎠
is equal to
(A) 0 (B) 0.5 (C) 1 (D) 2
3. Curl of vector 2 2 2 2 3 ˆˆ ˆ2 2F x z i xy zj y z k= − + is
(A) 3 2 2 2 ˆˆ ˆ(4 2 ) 2 2yz xy i x zj y zk+ + − (B) 3 2 2 2 ˆˆ ˆ(4 2 ) 2 2yz xy i x zj y zk+ − −
(C) 2 2 2 ˆˆ ˆ2 4 6xz i xyzj y z k− + (D) 2 2 2 ˆˆ ˆ2 4 6xz i xyzj y z k+ +
4. A box contains 25 parts of which 10 are defective. Two parts are being drawn
simultaneously in a random manner from the box. The probability of both the parts
being good is
(A) 7/20 (B) 42/125 (C) 25/29 (D) 5/9
5. The best approximation of the minimum value attained by e‐x sin(100x) for x ≥ 0 is
______
6. A steel cube, with all faces free to deform, has Young’s modulus, E, Poisson’s ratio,
v, and coefficient of thermal expansion, a. The pressure (hydrostatic stress)
developed within the cube, when it is subjected to a uniform increase in
temperature, T, is given by
(A) 0 (B) ( )1 2
T Ev
α Δ−
(C) ( )1 2
T Ev
α Δ−
(D) ( )
3(1 2 )T E
vα Δ
−
7. A two member truss ABC is shown in the figure. The force (in kN) transmitted in
member AB is _______
8. A 4‐bar mechanism with all revolute pairs has link lengths lf = 20 mm, lin = 40 mm,
lco = 50 mm and lout = 60 mm. The suffixes 'f', 'in', 'co' and 'out' denote the fixed link,
the input link, the coupler and output link respectively. Which one of the following
statements is true about the input and output links?
(A) Both links can execute full circular motion
(B) Both links cannot execute full circular motion
(C) Only the output link cannot execute full circular motion
(D) Only the input link cannot execute full circular motion
9. In vibration isolation, which one of the following statements is NOT correct
regarding Transmissibility (T)?
(A) T is nearly unity at small excitation frequencies
(B) T can be always reduced by using higher damping at any excitation
frequency
(C) T is unity at the frequency ratio of √2
(D) T is infinity at resonance for undamped systems
10. In a structure subjected to fatigue loading, the minimum and maximum stresses
developed in a cycle are 200 MPa and 400 MPa respectively. The value of stress
amplitude (in MPa) is _______
11. A thin plate of uniform thickness is subject to pressure as shown in the figure
below
Under the assumption of plane stress, which one of the following is correct?
(A) Normal stress is zero in the z‐direction
(B) Normal stress is tensile in the z‐direction
(C) Normal stress is compressive in the z‐direction
(D) Normal stress varies in the z‐direction
12. For laminar forced convection over a flat plate, if the free stream velocity increases
by a factor of 2, the average heat transfer coefficient
(A) remains same (B) decreases by a factor of √2
(C) rises by a factor of √2 (D) rises by a factor of 4
13. The thermal efficiency of an air‐standard Brayton cycle in terms of pressure ratio rp
and γ (= cp/cv) is given by
(A) 111 rpr
−− (B) 11 rpr
− (C) 1/11 rpr
− (D) ( 1)/11 r r
pr−−
14. For an incompressible flow field, V , which one of the following conditions must be
satisfied?
(A) 0V∇⋅ = (B) 0V∇ × =
(C) ( ) 0V V⋅∇ = (D) ( ) 0V V Vt
∂+ ⋅∇ =
∂
15. A pure substance at 8 MPa and 400 °C is having a specific internal energy of 2864
kJ/kg and a specific volume of 0.03432 m3/kg. Its specific enthalpy (in kJ/kg)
is_______
16. In a heat exchanger, it is observed that ΔT1 = ΔT2, where ΔT1 is the temperature
difference between the two single phase fluid streams at one end and ΔT2 is the
temperature difference at the other end. This heat exchanger is
(A) a condenser (B) an evaporator
(C) a counter flow heat exchanger (D) a parallel flow heat exchanger
17. The difference in pressure (in N/m2) across an air bubble of diameter 0.001 m
immersed in water (surface tension = 0.072 N/m) is_______
18. If there are m sources and n destinations in a transportation matrix, the total
number of basic variables in a basic feasible solution is
(A) m + n (B) m + n + 1 (C) m + n – 1 (D) m
19. A component can be produced by any of the four processes I, II, III and IV. The fixed
cost and the variable cost for each of the processes are listed below. The most
economical process for producing a batch of 100 pieces is
Process Fixed cost (in Rs.) Variable cost per piece (in Rs.)
I 20 3
II 50 1
III 40 2
IV 10 4
(A) I (B) II (C) III (D) IV
20. The flatness of a machine bed can be measured using
(A) Vernier calipers (B) Auto collimato
(C) Height gauge (D) Tool maker’s microscope
21. A robot arm PQ with end coordinates P(0,0) and Q(2,5) rotates counter clockwise
about P in the XY plane by 90°. The new coordinate pair of the end point Q is
(A) (‐2,5) (B) (‐5,2) (C) (‐5, ‐2) (D) (2, ‐5)
22. Match the Machine Tools (Group A) with the probable Operations
(Group B)
Group A Group B
P: Centre Lathe 1 : Slotting
Q: Milling 2: Counter-boring
R: Grinding 3 : Knurling
S: Drilling 4 : Dressing
(A) P‐(C) P‐3, Q‐1, R‐4, S‐2 (B) P‐2, Q‐1, R‐4, S‐3
(C) P‐3, Q‐1, R‐4, S‐2 (D) P‐3, Q‐4, R‐2, S‐1
23. The following four unconventional machining processes are available in a shop
floor. The most appropriate one to drill a hole of square cross section of 6 mm × 6
mm and 25 mm deep is
(A) Abrasive Jet Machining (B) Plasma Arc Machining
(C) Laser Beam Machining (D) Electro Discharge Machining
24. The relationship between true strain (εT) and engineering strain (εE) in a uniaxial
tension test is given as
(A) εE = ln (1 + εT) (B) εE = ln (1 ‐ εT )
(C) εT = ln (1 + εE) (D) εT= ln (1 ‐ εE)
25. With respect to metal working, match Group A with Group B:
Group A Group B
P: Defect in extrusion I: alligatoring
Q: Defect in rolling II: scab
R: Product of skew rolling III: fish tail
S: Product of rolling through
cluster mill
IV: seamless tube
V: thin sheet with tight tolerance
VI: semi-finished balls of ball bearing
(A) P‐II, Q‐III, R‐VI, S‐V (C) P‐III, Q‐I, R‐IV, S‐VI
(B) P‐III, Q‐I, R‐VI, S‐V (D) P‐I, Q‐II, R‐V, S‐VI
2
2
2
2
3
6. An an
v (x, y
(A) x2
(C) ‐ x
7. The g
const
(A) y
(C) co
8. Cons
face
the d
face o
9. The v
is ___
0. The f
lengt
appli
nalytic fun
y). where i
2 + y2 + con
x2 + y2 + co
general so
tant, is
+ sin (x + y
os2
x y+⎛ ⎞⎜ ⎟⎝ ⎠
ider an un
coloured r
dice. If the
of the dice
value of 4
25∫
__
flexural rig
th of the b
ed at the f
ction of a
i = 1− . If
nstant
onstant
olution of
y) = x + c
x c⎞ = +⎟⎠
nbiased cu
red, blue o
dice is thr
e at least tw
5
( )In x dx ca
gidity (EI) o
beam show
free end of
complex v
f u(x, y) = 2
(B)
(D)
the differ
(B)
bic dice w
or green su
rown thric
wice is ___
alculated u
of a cantil
wn in figu
f the beam
variable z =
2 x y, then
x2 ‐ y2 + co
‐ x2 ‐ y2 + c
rential equ
tan2
x y+⎛⎜⎝
(D) tan
ith opposi
uch that e
e, the prob
_____
using the T
ever beam
ure. If a lo
m then the
= x + i y is e
v(x, y) mus
onstant
constant
uation dydx
y c⎞ = +⎟⎠
2x y+⎛ ⎞ =⎜ ⎟
⎝ ⎠
te faces co
ach colour
bability of
Trapezoida
m is assum
oad P and
value of th
expressed
st be
yx= cos(x +
x c+ ]
oloured id
r appears o
obtaining
al rule with
med to be
bending
he slope at
as f(z) = u
+ y) , with
entically a
only two t
red colou
h five subi
constant o
moment P
t the free e
u(x, y) + I
h c as a
and each
times on
r on top
intervals
over the
PL/2 are
end is
3
3
3
3
(A) 12
1. A can
loade
defle
(A) 8w
2. For t
stren
requi
(A) M
3. Cons
ring‐l
of the
for a,
as aM
4. What
conta
block
below
2
2PLEI
ntilever be
ed uniform
ection of th
4
8wLEI
the three
ngth of 200
ired for the
M8
ider a flyw
like rim of
e flywheel
, if the mo
MR2, is____
t is the nat
act betwee
k is denote
w.
(B) PLEI
am of leng
mly by a v
he beam is
(B) 16w
bolt system
0 MPa. For
e bolt is
(B) M1
wheel whos
radius R a
, such as s
ment of in
____
tural frequ
en the bloc
ed by m an
2LEI
gth, L, with
vertical lo
given by
4wLEI
m shown
r a factor o
10
se mass M
nd a conce
pokes, etc
ertia of th
ency of th
ck and the
d the sprin
(C) 32PLE
h uniform c
ad, w per
(C) 4
4wLEI
in the figu
of safety o
(C) M12
is distribu
entric disk‐
, have neg
e flywheel
e spring m
inclined p
ng constan
2PLEI
cross‐secti
r unit leng
4
I
ure, the b
of 2, the m
2
ted almost
‐like featur
gligible mas
l about its
mass system
lane is fric
ts are den
(D) 52PLEI
on and fle
gth. The m
(D) 4
24wL
EI
olt materi
minimum m
(D) M16
t equally b
re of radiu
ss. The bes
axis of rot
m shown b
tionless. T
oted by k1
2LI
xural rigid
maximum
I
al has she
metric spec
between a
s R/2. Oth
st approxim
ation is ex
elow? The
The mass o
and k2 as
ity, EI, is
vertical
ear yield
cification
heavy,
er parts
mation
pressed
e
f the
shown
3
3
3
3
(A)
5. A dis
The m
The o
mm.
N.m)
6. A tru
coeff
value
is ___
7. Maxi
J. Ass
mom
±0.5%
8. Cons
below
of the
1 2
2k k
m+
sc clutch w
maximum
outer diam
Assuming
that can b
uck accele
ficient of fr
e of accele
_____
mum fluct
suming tha
ment of ine
% of the av
ider the tw
w. From th
e following
(B) k
with a sing
pressure w
meter of th
uniform w
be transmit
erates up
riction bet
ration (in
tuation of
at the eng
ertia (in kg
verage spe
wo states
he standpo
g statemen
1 2
4k k
m+
(C)
le friction
which can
he clutch p
wear theor
tted is _
a 10° inc
ween the
m/s2) of th
kinetic ene
gine runs a
g.m2) of a
ed is ____
of stress a
oint of dist
nts is true?
1 2k km−
(
surface h
be impose
plate is 200
ry for the
cline with
crate and
he truck su
ergy in an e
at an avera
flywheel
____
as shown
tortion en
?
D) 1k km+
as coeffici
ed on the
0 mm and
clutch pla
a crate
the truck s
uch that th
engine has
age speed
to keep th
in configu
nergy (von‐
2k
ient of fric
friction m
its intern
te, the ma
of 100 kg
surface is 0
he crate do
s been calc
of 200 rp
he speed
rations I a
‐Mises) cri
ction equa
aterial is 1
al diamete
aximum to
g. Value o
0.3. The m
oes not slid
culated to
m, the po
fluctuation
and II in th
iterion, wh
l to 0.3.
1.5 MPa.
er is 100
orque (in
of static
maximum
de down
be 2600
lar mass
n within
he figure
hich one
3
4
4
(A) I
(C) Bo
(D) N
9. A rig
angu
the m
0. A spu
powe
pair o
pinio
1. A sph
adve
cond
maxi
avoid
yields afte
oth yield s
Nothing can
gid link PQ
lar acceler
magnitude
ur pinion o
er. The pre
of the teet
n on the to
herical bal
rtisements
itions of
mum allow
d the fall of
er II
imultaneo
n be said a
Q of length
ration of 1
of the resu
of pitch di
essure angl
th is in con
ooth on a
loon with
s. The ball
15°C and
wable weig
f the ballo
ously
bout their
h 2 m rot
12 rad/s2. W
ultant acce
iameter 50
le of the to
ntact, the t
mating gea
a diamete
loon is fille
100 kPa.
ght (in new
on (Rair = 0
(B) II yie
relative yi
ates abou
When the
eleration (i
0 mm rota
ooth of the
total force
ar is _____
r of 10 m,
ed with he
Assuming
wton) of b
0.289 kJ/kg
elds after I
ielding
ut the pinn
angular ve
in m/s2) of
ates at 200
e pinion is
(in Newto
___
shown in
elium (RHe
g no distu
balloon ma
g.K) is ____
I
ned end Q
elocity of t
f the end P
0 rad/s an
20°. Assum
on) exerted
the figure
e = 2.08 kJ
urbances d
aterial and
_
Q with a c
the link is
P is ______
nd transmi
ming that o
d by a toot
e below is
J/kg.K) at
due to w
d rope req
constant
4 rad/s,
__
its 3 kW
only one
th of the
used for
ambient
ind, the
uired to
4
4
4
2. A hem
roof
const
roof t
3. Wate
Avera
and
drop
4. A ma
the f
show
therm
state
of ma
mispherica
maintaine
tant is 5.66
to the floo
er flows th
age velocit
855×10‐6 N
(in Pa) in t
aterial P of
figure belo
wn. The bou
mal conduc
heat cond
aterial P is
al furnace
d at 800 K,
68 × 10‐8 W
or is______
rough a 10
ty of 0.1 m
N.s/m2, re
the pipe is
thickness
ow. A heat
undary tem
ctivity of t
duction for
_______
of 1 m rad
, while its
W/m2.K4. T
__
0 mm diam
m/s. The d
espectively
_______
1 mm is sa
t flux 10 k
mperature
his steel is
r the confi
dius has the
floor (ε = 0
The net ra
meter and 2
ensity and
y. Assumin
andwiched
kW/m2 is
s of the sla
s 10 W/m.K
guration, t
e inner sur
0.5) is kept
diative hea
250 m long
d the visco
ng fully‐de
d between
supplied t
abs are ind
K. Conside
the therma
rface (emis
t at 600 K.
at transfer
g smooth p
osity of wa
veloped f
two steel
to one of
dicated in t
ring one‐d
al conduct
ssivity, ε =
Stefan‐Bo
r (in kW) f
pipe at an
ter are 99
low, the p
slabs, as s
the steel
the figure.
dimensiona
tivity (k, in
1) of its
oltzmann
from the
97 kg/m3
pressure
shown in
slabs as
Assume
al steady
W/m.K)
4
4
4
4
5. Cons
thick
boun
6. In an
speci
to 8 b
supp
cycle
7. Steam
baldi
angle
8. In a c
25°C
flow
wate
wate
this h
ider lamin
ness at a d
ndary layer
n ideal Br
ific heat at
bar. The m
lied at the
is ______
m at a vel
ng having
e is 20°. Th
concentric
and leave
passage. T
r and the
r and oil a
heat excha
ar flow of
distance o
r thickness
ayton cyc
t constant
maximum t
e rate of 8
__
ocity of 10
blade ang
e maximu
counter fl
es at 42°C.
The exit t
engine oil
are 4178 J
nger is ___
water ove
of 0.25 m f
(in mm), a
le, atmosp
pressure =
temperatu
80 MW, the
0 m/s ente
le 30°. The
m blade ef
ow heat e
. The engin
emperatur
are 1.5 kg
J/kg.K and
_____
er a flat pla
from the le
at a distanc
pheric air
= 1.005 kJ/
re in the c
e mass flo
ers the im
e enthalpy
fficiency (in
xchanger,
ne oil ente
re of the
g/s and 1 k
2130 J/kg
ate of lengt
eading edg
ce of 0.75
(ratio of
kg.K) at 1 b
cycle is lim
ow rate (in
mpulse turb
drop in th
n percent)
water flow
ers at 100
engine oil
kg/s, respe
g.K, respec
th 1 m. If t
ge of the p
m, is
specific h
bar and 30
ited to 128
n kg/s) of a
bine stage
he stage is
is ______
ws through
0°C and flo
is 50°C. M
ectively. Th
ctively. Th
he bounda
plate is 8 m
heats, cp/c
00 K is com
80 K. If the
air require
with sym
100 kJ. Th
__
h the inner
ows in the
Mass flow
he specific
e effective
ary layer
mm, the
cv = 1.4,
mpressed
e heat is
ed in the
metrical
e nozzle
r tube at
annular
w rate of
c heat of
eness of
4
5
5
9. A hea
limits
vapo
below
is ___
Satu
temp
Tsat
-20
25
0. A pro
The n
day.
If the
of the
1. Cons
order
Ann
Unit
Inve
at pump w
s of ‐20°C
ur at the t
w. The ent
_____
uration
perature
(°C)
oject has fo
normal cos
e project d
e project is
ider the fo
r quantity
nual deman
t price of th
entory carr
with refrige
and 25°C.
ime of disc
halpy (in k
Pressure
P(MN/m
0.2448
1.048
our activiti
st of the pr
uration ha
s _______
ollowing d
model
nd of an ite
he item (in
ying cost p
erant R22
. The heat
charge as 0
kJ/kg) of th
Specifi
enthalp
m2) hf (kJ/k
177.21
230.07
es P, Q, R
roject is Rs
as to be cra
ata with r
em
n Rs.)
per unit per
is used fo
t required
0.98 kJ/kg
he refrigera
fic
py
kg) hg
1 39
7 4
and S as sh
s. 10,000/‐
ashed dow
eference t
r year (in R
r space he
is 200 MJ
.K. Other r
ant at isen
g(kJ/kg)
97.53
13.02
hown belo
and the ov
wn to 9 day
to element
1000
10
Rs.) 1.5
eating betw
J/h. Assum
relevant pr
tropic com
Specific en
sf(kJ/kg.K
0.9139
1.1047
w.
verhead co
ys, the tota
tary deter
000
ween temp
me specific
roperties a
mpressor d
ntropy
K) sg(kJ/kg
1.7841
1.7183
ost is Rs. 2
al cost (in
ministic ec
perature
heat of
are given
ischarge
g.K)
00/‐ per
Rupees)
conomic
Unit order cost (in Rs.) 30
The total number of economic orders per year to meet the annual demand is
_____
52. For the CNC programming, match Group A with Group B:
Group A Group B
P: circular interpolation, counter clock wise I: G02
Q: dwell II: G03
R: circular interpolation, clock wise III: G04
S: point to point countering IV: G00
(A) P‐II, Q‐III, R‐I, S‐IV (B) P‐I, Q‐III, R‐II, S‐IV
(C) P‐I, Q‐IV, R‐II, S‐III (D) P‐II, Q‐I, R‐III, S‐IV
53. A mild steel plate has to be rolled in one pass such that the final plate thickness is
2/3rd of the initial thickness, with the entrance speed of 10 m/min and roll
diameter of 500 mm. If the plate widens by 2% during rolling, the exit velocity (in
m/min) is _______
54. A hole of 20 mm diameter is to be drilled in a steel block of 40 mm thickness. The
drilling is performed at rotational speed of 400 rpm and feed rate of 0.1 mm/rev.
The required approach and over run of the drill together is equal to the radius of
drill. The drilling time (in minute) is
(A) 1.00 (B) 1.25 (C) 1.50 (D) 1.75
55. A rectangular hole of size 100 mm × 50 mm is to be made on a 5 mm thick sheet of
steel having ultimate tensile strength and shear strength of 500 MPa and 300 MPa,
respectively. The hole is made by punching process. Neglecting the effect of
clearance, the punching force (in kN) is
(A) 300 (B) 450 (C) 600 (D) 750
Key for Excersice2
Q.NO Key / Range 1 D 2 B 3 A 4 A 5 ‐1.00 to ‐0.94 6 A 7 18 to 22 8 A 9 B 10 99 to 101 11 A 12 C 13 D 14 A 15 3135 to 3140 16 C 17 287 to 289 18 C 19 B 20 B 21 B 22 C 23 D 24 C 25 B 26 C 27 D 28 0.25 to 0.27
29 1.74 to 1.76 30 B 31 A 32 B 33 0.55 to 0.57 34 D 35 529 to 532 36 1.0 to 1.3 37 590 to 595 38 C 39 39 to 41 40 638 to 639 41 5300 to 5330 42 24.0 to 25.2 43 6800 to 6900 44 0.09 to 0.11 45 13.5 to 14.2 46 105 to 112 47 85.1 to 89.9 48 0.65 to 0.67 49 430 to 440 50 12490 to 12510 51 49 to 51 52 A 53 14.6 to 14.8 54 B 55 B