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Last year question papers for Electronics and Communication for ONGC exam

Will you please share with me the last year question papers for Electronics and Communication for ONGC exam?
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19th August 2014, 03:28 PM
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Re: Last year question papers for Electronics and Communication for ONGC exam

As you want to get the last year question papers for Electronics and Communication for ONGC exam so here it is for you:

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Last year question papers for Electronics and Communication for ONGC exam

1 . Two coils in differential connection hav e self-inductance of 2 mH and 4 mH and a mutual inductance of
0.1 5 mH. The equiv alent inductance of the combination is
A. 5.7 mH
B. 5.85 mH
C. 6 mH
D. 6.1 5 mH.
2. Two point charges Q and -Q are located on two opposite corners of a square as shown in figure. If the
potential at the corner A is taken as 1 V, then the potential at B, the centre of the square will be
1. zero
2.
3. 1 V
4.
3. Optocouplers combine
A. SITs and BJTs
B. IGBTs and MOSFETS
C. Power transformers and silicon transistor
D. Infrared light-emitting diode and a silicon phototransistor
4. The difference between the indicated v alue and the true v alue of a quantity is known as
A. Gross error
B. Absolute error
C. Dy namic error
D. Relativ e error
5. The principles of homogeneity and super-position are applied to :
A. linear time v ariant sy stems
B. non-linear time v ariant sy stems
C. linear time inv ariant sy stems

D. non-linear time inv ariant sy stems.
6. In a 8085 microprocessor sy stem with memory mapped I / 0,
A. I / 0 dev ices hav e 8-bit addresses
B. I / 0 dev ices are accessed using IN and OUT instructions
C. there can be a max imum of 256 input dev ices and 256 output dev ices.
D. arithmetic and logic operations can be directly performed with the I / 0 data.
7 . The transistor shown in figure below, is biased
1. at cut-off
2. at saturation
3. well into saturation
4. well into cut-off
8. In any transmitting antenna sy stem, efficiency primarily depends upon
A. ohmic losses of v arious conductors
B. radiation resistance
C. ground conductiv ity
D. atmospheric conditions.
9. An instruction used to set the carry Flag in a computer can be classified as
A. data transfer
B. arithmetic
C. logical
D. program control
1 0. The binary representation of 5.37 5 is
A. 1 1 1 .1 01 1
B. 1 01 .1 1 01
C. 1 01 .01 1
D. 1 1 1 .001
1 1 . Dislocations in materials are
A. point defect

B. line defect
C. planer defect
D. surface defects.
1 2. In TV sy stem, v ertical pulses are separated out from horizontal pulses by the use of
A. integrator
B. differentiator
C. sweep credit
D. sy nc separator.
1 3. Frequency in the UHF range propagate by means of
A. Ground wav es
B. Sky wav es
C. Surface wav es
D. Space wav es.
1 4. 200 MHz may be classified as
A. VHF
B. SHF
C. UHF
D. EHF
1 5. A communication satellite is a repeater between
A. a transmitting station and a receiv ing station
B. a transmitting station and many receiv ing stations
C. many transmitting stations and many receiv ing stations
D. none of the abov e
1 6. The power in a series R-L-C circuit will be half of that at resonance when the magnitude of the current is
equal to
A. V / 2R
B. V /
C. V /
D.

1 7 . A point charge Q is located on the surface of a sphere of radius R as shown in the figure. The av erage
electric field on the surface of the sphere will be
1. infinite
2.
3.
4. Zero
1 8. The efficiency of a chopper can be ex pected in the range
A. 50 to 55 percent
B. 65 to 7 2 percent
C. 82 to 87 percent
D. 92 to 99 percent
1 9. Which one out of the following instruments should be used to measure 600 kV a.c. v oltages?
A. Hot wire instrument
B. Electrostatic v oltmeter
C. Mov ing coil v oltmeter
D. Mov ing iron v oltmeter.
20.
Which one of the following transfer functions represents the Bode plot shown in the abov e figure :
1.
2.
3.
4.
21 . The following programme is run on an 8085 microprocessor,
Memory address in Hex Instruction
2000 LXI SP, 1 000
2003 PUSH H
2004 PUSH D
2005 CALL 2050
2008 POP 2050

2009 HIT
As the completion of ex ecution of the program, the program the program counter of the 8085 contains ………,
and the stack pointer contains ……..
1. 2050, OFFC
2. 2251 , OFFC
3. 1 025, OCCF
4. 1 025, OCCF
22. With reference to figure, v alue of VCE is
1. 0 V
2. 5 V
3. -5V
4. none of the abov e
23. The smallest change in sound intensity that can be detected
A. 1 dB
B. 3 dB
C. 1 0 dB
D. 20 dB.
24. In a generic microprocessor, instruction cy cle time is
A. shorter than machine cy cle time
B. larger than machine cy cle time
C. ex actly double the machine cy cle time
D. ex actly the same as the machine cy cle time
25. The v alue of M in the end will be
Do 1 00 I = 1 , 2
DO 200 J = 1 , 2
M = M + I + J
200 CONTINUE
1 00 CONTINUE
STOP
END

1. 1 0
2. 1 1
3. 1 2
4. 1 4
26. Resistiv ity of electrical conductors is most affected by
A. temperature
B. pressure
C. composition
D. all of the abov e.
27 . In CCIR B-sy stem of TV, blanking pulse is placed during
A. equalizing pulse
B. retrace interv al between each line
C. retrace period of v ertical line
D. none of the abov e.
28. The polarization required in ground wav e propagation is
A. Horizontal (linear)
B. v ertical (linear)
C. Circular
D. Elliptical
29. Multicav ity Kly stron
A. is not a microwav e dev ice
B. is not a good low lev el amplifier because of noise
C. is not suitable to pulse operation
D. has a high repeller v oltage to insure small transit time
30. Transponder comprises of
A. Transmitter
B. Receiv er
C. Antenna
D. a, b, c combined
31 . Consider the following statements regarding the circuit shown in the giv en figure :

1 . If the switch K is closed at a proper instant there will be no transient
2. The instant at which K is closed such that the transient is zero depends on the frequency of the supply
3. The instant at which K is closed such that the transient is zero depends on the circuit elements
4. There will alway s be a non-zero transient after the switch K is colosed.
Of these statements :
1. 1 alone is correct.
2. 1 and 2 are correct.
3. 1 and 3 are correct
4. 4 alone is correct.
32. A circular ring carry ing a uniformly distributed charge Q and a point charges -Q on the ax is of the ring
are shown in the fig. The magnitude of the dipole moment of the charge sy stem is
1. Qd
2. Q R2 / d
3. Q
4. QR.
33. Which of the following regulator prov ides output v oltage polarity rev ersal without a transformer
A. Buck regulator
B. Boost regulator
C. Buck-boost regulator
D. Cuk regulator
34. The deflection of hot wire instrument depends on
A. RMS v alue of alternating current
B. v oltage
C. av erage v alue of a.c. current
D. instantaneous v alue of a.c. current.
35. Match List-I with List-II and select the correct answer using the codes giv en below the Lists :
List-I List-II
(Response to a unit step input) (Location of poles in the s-plane)
1. 1 .One at the origin

B. 2.Two identical roots on the negativ e real ax is.
C. 3.Two on the imaginary ax is
D. 4.One on the position real ax is.
Codes:
A B C D
A. 4 3 2 1
B. 3 4 1 2
C. 3 4 2 1
D. 4 3 2 1
36. Dual slope integration ty pe Analog-to-Digital conv erters prov ide
A. higher speeds compared to all other ty pes of A / D conv erters
B. v ery good accuracy without putting ex treme requirements on component stability
C. poor rejection of power supply hums
D. better resolution compared to all other ty pes of A / D conv erters for the same number
of bits.
37 . In the figure giv en below, the collector current is
2 mA
200 mA
Almost zero
0.02 mA
38. The frequency modulated (FM) radio frequency range is nearly
A. 250 - 300 MHz
B. 1 50 - 200 MHz
C. 90 - 1 05 MHz
D. 30 - 7 0 MHz
39. A 32 bit microprocessor has the word length equal to
A. 2 by tes

B. 1 by te
C. 4 by tes
D. 8 by tes
40. In electronic microcircuits, a resistor may be fabricated from constant-thickness lay er of
semiconductor material with conductor connections at the edges as shown below. If the resistor shown has
resistance R, then a similar resistor 0.2 millimeter has a resistance of
4 R
2 R
R
R / 2
41 . Line imperfection in a cry stal is called
A. Schottky defect
B. Frenkel defect
C. edge dislocation
D. Miller defect.
42. The function of diplex er bridge in a TV transmitter is
A. to prev ent the loading of sev eral transmitters by v ideo transmitter
B. to increase the bandwidth
C. to increase the power output
D. to increase the efficiency of transmission.
43. Sometimes microwav e signals follow the earth’s curv ature. This due to
A. Ionospheric reflection
B. Faraday rotation
C. Ducting
D. Ionospheric scatter.
44. The modes in a reflex Kly stron
A. giv e the same frequency but different transit time
B. result from ex cessiv e transit time across the resonator gap
C. are caused by spurious frequency modulation
D. are just for theoretical considerations.

45. The capacity of a channel is
A. number of digits used in coding
B. v olume of information it can take
C. max imum rate of information transmission
D. bandwidth required for information
Solution
1 .A. When two inductors are connected in series, the effectiv e inductance is
Leff = L1 + L2± 2 m.
In this case, Leff = L1 + L2 - 2 M
= 2 + 4 - 2 × 0.1 5
= 5.7 mH.
2.C. The plane midway between a and -a, i.e., the one passing through ABC and perpendicular to the plane of
the paper is an equipotential plane. Hence the potential at B is the same as that of A or C, i.e., 1 V.
3.D. In optocouplers the input signal is applied to the ILED and the output is takes from the phototransistor.
These are used to isolate the gate signals from the power circuit.
4.C. The difference between the indicated v alue and the true v alue of a quantity is known as dy namic error.
5.C. The Principles of homogeneity and superposition are applied to linear time inv ariant sy stems.
6.D. In an 8085 microprocessor sy stem with memory mapped I / 0 arithmetic and logic operations can be
directly performed with I / 0 data.
7 .B. Neglecting VBE, IB = 1 0 / 1 00 = 0.1 A.
IC = 1 00 × 0.1 = 1 0 A. Drop ov er RL = 1 0 v .
Hence, VCE = 0 which is the condition for saturation.
8.B.
whereRr is radiation resistance and Rd is the total loss resistance of the antenna.
9.B. Arithmetic
1 0.C. 1 01 .001 = (4 + 0 + 1 )
(0 + 0.25 + 0.1 25)
= 5.37 5

1 1 .B. Dislocations in materials are line defects.
1 2.A. Integrator.
1 3.D. Frequency in the UHF Range propagate by means of space wav es.
1 4.A. VHF.
1 5.C. a communication satellite is a repeater between many transmitting stations and many receiv ing
stations.
1 6.C. V / Ö2 R
1 7 .C. The point charge Q emanates a total electric displacement flux of Q. If a plane is passed through the
point of location of charge and tangential to the sphere, half the flux is on one side and half on the other. The
first half of flux is passing through the spherical surface. Thus the av erage displacement density has a
direction opposite to that of n and the magnitude is
\ Av erage electric
field is :
Eav =
1 8.D. The efficiency of a practical chopper v aries from 92 to 99 percent.
1 9.B. Electrostatic v oltmeter should be used to measure 600 kV a.c. v oltage.
20.A. it can easily be checked that the corresponding function is
G (s) = (1 - s) / (1 + s)
It is seen immediately that | G (jw) |
= 1 and hence gain is db = 0.
21 .A. Memory address in hex Instruction Remarks
2000 LXI SP 1 000
2003 PUSH H
2004 PUSH D We do not
2005 CALL 2025 know the
contents of
subroutine
at 2050.
2006 50

2007 20
2008 POP H
2009 HALT
At the completion of the ex ecution of the program, the program counter of the 8085 contains 2050 and the
stack pointer contains OFFC.
22.B. Neglecting, VBE
=
23.B. Increase = 1 0 log1 0 P2 / P1 = 1 0 log1 02
= 1 0 × 0.3 = 3dB.
24.D. Instruction cy cle time is ex actly the same as the machine cy cle time.
25.C. Taking index of I = 1 and M = 0 computing the v alue of M with
J = 1 , 2
J = 1
M = 0 + 1 + 1 = 2
J = 2
M = 2 + 1 + 2 = 4
Taking index of I = 2 and computing the v alue of M with J = 1 , 2
J = 1
M = 5 + 2 + 1 = 8
J = 2
M = 1 + 2 + 2 = 1 2
26.A. Resistiv ity of electrical conductors is most affected by temperature.
27 .B. In CCIR B-sy stem of TV, blanking pulse is placed during retrace interv al between each line
28.B. The polarization required in ground wav e propagation is v ertical (linear).
29.A. Multicav ity Kly stron is not a good low lev el amplifier because of noise.
30.D. Transponder comprises of transmitter, receiv er and antenna.
31 .C. If the switch is closed at instant t = to, the complete ex pression for current will be

The transient is zero if wt0 + q - f = 0
or t0 = (f - q) / w
Thus it is possible to find to such that there is no transient. Further to depends upon the circuit parameters
and the frequency .
So, the statements 1 and 3 are true.
32.A. For points far away , the charge on the ring may be considered to be located be at the centre of the ring.
Hence, the dipole moment becomes Qd.
33.C. a puck-boost regulator prov ides on output v oltage which may be less than or greater than the input
v oltage. The output v oltage polarity is opposite to that of the input v oltage. It has high efficiency .
34.A. The deflection of hot wire instrument depends on RMS v alue of alternating current.
35.A. Considering that there are poles of H (s), then
H1 (s) =
H3 (s) =
The impulse responses [a-1 H (s)] can be found and the step response are integrations of the
corresponding impulse responses.
36.B. Dual slope integration ty pe A to D conv erters are of slow speed and require more number of bits, than
successiv e approx imation ADC.
37 .C. Since emitter and base hav e same polarity and same potential, EBJ is not biased property . Hence, IB is
zero and so is IC.
38.C. The frequency modulated (FM) radio frequency range is nearly 90 - 1 05 MHz.
39.C. 4 by tes.
40.C. Resistance will be directly proportional to length and inv ersely proportional to the cross-sectional
area. Let t mm be the thickness of semi-conductor material so that the cross-sectional area for R ohm resistor
is 0.1 × t sq. mm and length of semi - conductor material 0.1 mm.
For a 0.2 mm × 0.2 mm section, cross - sectional area = 0.2 × t sq. mm. Length = 0.2 mm
Hence, resistance,
= R =
41 .C. Line imperfection in a cry stal is called edge dislocation.
42.A. The function of diplex er bridge in a TV transmitter is to prev ent the loading of sev eral transmitters by
v ideo transmitter.
43.C. Sometimes microwav e signals follow the earth’s curv ature. This is due to ducting.
44.A. The modes in a reflex Kly stron giv e the same frequency but different transit time.

45.C. The capacity of a channel is max imum rate of information transmission
Mechanical-Engineering MT 2009
A definite area or space where some thermody namic process takes place is known as
A thermody namic sy stem B thermody namic cy cle
C thermody namic process D thermody namic law
2. Which of the following is an intensiv e property of a thermody namic sy stem?
A v olume B Temperature
C mass D energy
3. Temperature at which the v olume of the gas becomes 0 is called
A absolute scale of temperature B absolute 0 temperature
C absolute temperature D none of these
4. The unit of energy in SI units is
A joule B joule metre
C watt D joule/metre
5. 1 joule is equal to
A 1 Nm B kNm
C 1 0 Nm/s D 1 0 kNm/s
6. In an irrev ersible process there is a
A loss of heat B no loss of heat
C gain of heat D no gain of heat
7 . The following is an SI engine
A diesel engine B petrol engine
C gas engine D none of the abov e
8. In a 4 stroke cy cle petrol engine during suction stroke
A only air is sucked in B only petrol is sucked in
C mix ture of petrol and air is sucked in
D none of the abov e

9. The thermal efficiency of petrol engine as compared to diesel engine is
A lower B higher
C same for same power output D same for same speed
1 0. Compression ratio of diesel engines may hav e a range
A 8 to 1 0 B 1 0 to 1 5
C 1 6 to 20 D none of the abov e
1 1 The thermal efficiency of good I.C engine at the rated load is in the range of
A 80 to 90% B 60 to 7 0%
C 30 to 35% D 1 0 to 20%
1 2 Carburettor is used for
A SI engines B gas engines
C CI engines D none of the abov e
1 3 In SI engine to dev elop high v oltage for spark plug
A battery is installed B distributor is installed
C carburetor is installed D ignition coil is installed
1 4 In a four cy linder petrol engine the standard firing order is
A 1 -2-3-4 B 1 -4-3-2
C 1 -3-2-4 D 1 -3-4-2
1 5 The knocking is SI engines increases with
A increase in inlet air temperature B increase in compression ratio
C increase in cooling water temperature D all of the abov e
1 6 Petrol commercially av ailable in India for Indian passenger cars has octane
number in the range
A 40 to 50 B 60 to 7 0
C 80 to 85 D 95 to 1 00
1 7 The knocking tendency in C.I engines increases with
A decrease of compression ratio B increase of compression ratio
C increasing the temperature of inlet air D increasing cooling water
temperature

1 8 The air standard otto cy cle comprises
A two constant pressure processes and two constant v olume processes
B two constant pressure and two constant entropy processes
C two constant v olume processes and two constant entropy processes
D none of the abov e
1 9 The thermal efficiency of theoretical otto cy cle
A increases with increase in compression ratio
B increases with increase in isentropic index gamma
1. C does not depend upon the pressure ratio
D follows of the abov e
20 Thermal efficiency of a gas turbine plant has compared to diesel engine plant is
A higher B lower
C same D may be higher or lower
21 Mechanical efficiency of a gas turbine as compared to internal combustion
Reciprocating engine is
A higher B lower
C same D unpredictable
22 For a gas turbine the pressure ratio may be in the range
A 2 to 3 B 3 to 5
C 1 6 to 1 8 D 1 8 to 22
23 Thermal efficiency of a closed cy cle gas turbine plant increases by
A reheating B intercooling
C regenerator D all of the abov e
24With the increase in pressure ratio thermal efficiency of a simple gas turbine
Plant with fix ed turbine inlet temperature
A decreases B increases
C first increases and then decreases D first decreases and then increases
25In two stage turbine plant, reheating after first stage

A increases work ratio B decreases work ratio
C does not affect work ratio D none of the abov e
26For a jet propulsion unit , ideally the compressor work and turbine work are
A equal B unequal
C not related to each other D unpredictable
27 Various kinematic pairs are giv en below.choose the lower pair
A ball bearings B tooth gears in mesh
C camm and follower D crank shaft and bearing
28The relation between the number of pairs forming a kinematic chain and the
Number of links is
A l=2p-2 B l=2p-3
C l=2P-4 D l=2p-5
29In a reciprocating engine
A crankshaft and fly wheel form 2 kinematic links
B crankshaft and fly wheel form 1 kinematics links
C crankshaft and fly wheel do not form kinematic links
D fly wheel and crankshaft separately form kinematic links
30A kinematic chain is known as a mechanism when
A none of the link is fix ed
B one of the links is fix ed
C two of the links are fix ed
D all of the links are fix ed
31 Which of the following is an inv ersion of single slider crank chain?
A beam engine
B watt’s indicator mechanism
C elliptical trammels
D whitworth quick return motion mechanism
32 control v olumes refer to

A a fix ed region in space
B a specified mass
C an isolated sy stem
D a closed sy stem
33An isentropic process is alway s
A irrev ersible and adiabatic
B rev ersible and isothermal
C friction less and irrev ersible
D rev ersible and adiabatic
34Work done in a free ex pansion process is
A 0
B minimum
C max imum
D positiv e
35.The figure shows a pin-jointed plane truss loaded at the point M by hanging a mass of 1 00 kg. The
member LN of the truss is subjected to a load of?
(a) 0 Newton
(b)490 Newtons in compression
(c)981 Newtons in compression
(d) 981 Newtons in tension
36.In terms of.Poisson’s ratio (v ) the ratio of Y oung’s Modulus (E) to Shear Modulus (G) of elastic materials is
?
(a)2(1 + v )
(b) 2(1 — v )
(c)(1 + v )/2
(d)(1 — v )/2

37 . Two mating spur gears hav e 40 and 1 20 teeth respectiv ely . The pinion rotates at
1 200 rpm and transmits a torque of 2O N. m. The torque transmitted by the gear is
(a) 6.6 Nm
(b) 20 Nm
(c) 40 Nm
(d) 60 Nm
38. The figure shows the state of stress at a certain point in a stressed body . The magnitudes of normal stresses
in the x and y direction are 1 00 MPa and 20 MPa respectiv ely . The radius of Mohr’s stress circle representing
this state of stress is
(a)1 20
(b)80
(c)60
(d)40
39.For a mechanism shown below, the mechanical adv antage for the giv en configuration is?
(a)0
(b) 0.5
(c)1 .0
(d)Infinity
40.A v ibrating machine is isolated from the floor using springs. If the ratio of ex citation frequency of
v ibration of machine to the natural frequency of the isolation sy stem is equal to 0.5, the transmissibility of
ratio of isolation is
(a)1 /2
(b)3/4
(c)4/3
(d)2
41 . A torque of 1 0 Nm is transmitted through a stepped shaft as shown in figure.
The torsional stiffnesses of indiv idual sections of lengths MN, NO and OP are 20 Nm/rad 30 Nm/rad and 60
Nm respectiv ely . The angular deflection between the ends M and P of the shaft is?

(a) 0.5 rad
(b) 1 .0 rad
(c) 5.0 rad
(d) 1 0.0 rad
42.
43. The S-N curv e for steel becomes asy mptotic nearly at
(a)1 0 3 cy cles
(b) 1 0 4 cy cles
(c)1 0 6 cy cles
(d) 1 0 9 cy cles
44. In the window air conditioner, the ex pansion dev ice used is
(a)capillary tube
(b) thermostatic ex pansion v alv e
(c)automatic ex pansion v alv e
(d) float v alv e
45. During chemical de-humidification process of air
(a) dry bulb temperature and specific humidity decrease
(b) dry bulb temperature increases and specific humidity decreases
(c) dry bulb temperature decreases and specific humidity increases
(d) dry bulb temperature and specific humidity increase
46.An incompressible fluid (kinematic v iscosity , 7 .4 x 1 0-7 m2 /s, specific grav ity , 0.88) is held between two
parallel plates. If the top.plate is mov ed with a v elocity of 0.5 rn/s while the bottom one is held stationary , the
fluid attains a linear v elocity profile in the gap of 0.5 mm between these plates; the shear stress in Pascals on
the surface of top plate is ?
(a)0.651 x 1 0 -3
(b) 0.651
(c)6.51
(d) 0.651 x 1 03
47 .Env ironment friendly refrigerant R1 34a is used in the new generation domestic refrigerators. Its chemical
formula is ?

(a)CH ClF2
(b) C2 Cl 3F3
(c)C2 Cl 2F4
(d) C2 H2F4
48.
(a)x —2y =0
(b) 2x +y =0
(c)2x —y =0
(d) x +2y =0
49. A gas contained in a cy linder is compressed, the work required for compression being 5000 kJ. During the
process, heat interaction of 2000 kJ causes the surroundings to the heated. The change in internal energy of
the gas during the process is
(a)—7 000kJ
(b) —3000kJ
(c)+ 3000 kJ
(d) + 7 000 kJ
50.The compression ratio of a gas power plant cy cle corresponding to max imum work output for the giv en
temperature limits of Tmin and Tmax will be
51 .
(a)1 0 microns
(b) 20 microns
(c)30 microns
(d) 60 microns
51 .
(a) circular Interpolation — clockwise
(b) circular Interpolation — counterclockwise
(c) linear Interpolation

(d) rapid feed
52. The mechanism of material remov al in EDM process is
(a) Melting and Ev aporation
(b) Melting and Corrosion
(c) Erosion and Cav itation
(d) Cav itation and Ev aporation
53. Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming, effectiv e resistance to
be 200 micro-ohms and current flow time of 0.2 second, heat generated during the process will be
(a)0.2 Joule
(b) 1 Joule
(c)5 Joule
(d) 1 000 Joules
54. In PERT analy sis a critical activ ity has
(a)max imum Float
(b) zero Float
(c)max imum Cost
(d) minimum Cost
55. For a product, the forecast and the actual sales for December 2002 were 25 and 20 respectiv ely . If the
ex ponential smoothing constant (a) is taken as 0.2, the forecast sales for January 2003 would be ?
(a)21
(b)23
(c)24
(d) 27
56. Misrun is a casting defect which occurs due to
(a) v ery high pouring temperature of the metal
(b) insufficient fluidity of the molten metal
(c) absorption of gases by the liquid metal
(d) improper alignment of the mould flasks
57 . The percentage of carbon in gray cast iron is in the range of

(a)0.25 to 0.7 5 percent
(b) 1 .25 to 1 .7 5 percent
(c)3 to 4 percent
(d) 8 to 1 0 percent
58.In the figure shown,
the relativ e v elocity of link1 with respect to link 2 is 1 2 m/sec. Link 2 rotates at a constant speed of 1 20 rpm.
The magnitude of Coriolis component of aceeleration of link 1 is
(a)302 m/s2
(b)604 m/s2
(c)906 m/s2
(d) 1 208 m/s2
59. The figure below shows a planar mechanism with single degree of freedom.
The instant center 24 for the giv en configuration is located at a position ?
(a) L
(b) M
(c) N
(d)Infinity
60.A uniform stiff rod of length 200 mm and hav ing a weight of 300 N is piv oted at one end and connected to
a spring at the other end.
For keeping the rod v ertical in a stable position the minimum v alue of spring constant K needed is ?
(a) 300 N/m
(b) 400 N/m
(c) 500 N/m
(d) 1 000 N/m
61 . In a bolted joint two members are connected with an ax ial tightening force of 2200 N.
If the bolt used has metric threads of 4 mm pitch, the torque required for achiev ing the tightening force is?
(a)0.7 Nm
(b)1 .0 Nm
(c)1 .4 Nm
(d) 2.8 Nm


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