Sail Previous Year Placement Question Papers Free Download www.sail.co.in
1.where does a body have least weight?
a) at the equator
b) at the poles
c) at earth's center
d) none of these
2. what is the millman's theorem?
3. what happens if a dc motor is fed an ac signal?
4. calculate electron mobility.
5. power MOSFET is voltage controlled or current controlled?
6. if u want a 640 k RAM, what specification should u specify in the drive?
7. max efficiency of a class a amplifier?
8.what r resistors in IC made of?
9. 6 girls and 6 bos sitting randomly in a line. what probability of girls being
together?
10.what is the prob. of two friends having birthdays in same month?
11. (D^2 + 4)y= kx what if PI?
12. lim x-infinity sinx/x
13. express x/(x+1) as taylor's series
14.principle of jet engine
15. why hydraulic systems used ina aircrafts instead of electrical?
16. steel + ? = corrosion-resistant material?
17. what happens to speed of em wave as frequency increases?
18. which char. of em wave does not change when it travels from one mdium to
another?
19. circuit given. find attenuation in db.
20. circuit given. how much feedback?
21. (s-1)/(s+1) is high pass filter/ low pass filter?
22. fastest logic family among rtl, dtl, ttl?
23. in common emitter config. change in iC on changing vBE?
24. what happens if gate voltage of an ON scr is decreased?
25. fermi level change with temperature in n type semiconductor?
26. mosfet has threshold voltage 1v when n+ polysilicon is used in gate. what is
threshold voltage when polysilicon used is of n+ type?
27. simple ckts using zener diode.
28. what is the p+ substrate in an isolated pn junction ic connected to?
29. opamp circuit given. open loop gain=100. closed loop gain=?
30. which type of parameters( h/y/z) suitable in particular application?
31. given parallel LC ckt. find angle between currents in branches at resonance.
32. what is Q of series RLC ckt? (voltage gain/ admttance etc.)
33. resonant freq of parallel RLC ckt. ?
34. thin metal foil inserted between capacitor plates. foil connected to one plate.
change in capacitance?
35. ques on reflection of em wave at air= dielectric interface. dlc const=9
36. what is brewster's angle?
37. why microwave freq not used for ionospheric propagation?
38. uhf range?
39. freq range used in satellite comunication?
40. which ionospheric bands used for commercial purposes?
41. question on transmission line impedance matching?
42. flip- flop d, t 43. convert 32 k pulses to 1 hz pulses using decade counters etc
Q.1.Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is
5.7 mH
5.85 mH
6 mH
6.15 mH.
Q.2.In a 8085 microprocessor system with memory mapped I / 0,
I / 0 devices have 8-bit addresses
I / 0 devices are accessed using IN and OUT instructions
there can be a maximum of 256 input devices and 256 output devices.
arithmetic and logic operations can be directly performed with the I / 0 data.
Q.3.When 2-port networks are connected in parallel, which parameters convenient to use
inverse hybrid
open circuit impedance
short circuit admittance
transmission
Q.4.The number of comparators needed in a 4-bit flash type ADC is
32
8
14
15
Q.5.Line imperfection in a crystal is called
Schottky defect
Frenkel defect
edge dislocation
Miller defect.
Q.6.The frequency modulated (FM) radio frequency range is nearly
250 - 300 MHz
150 - 200 MHz
90 - 105 MHz
30 - 70 MHz
Q.7.A 10 MHz square wave clocks a 5-bit ripple counter. The frequency of third flip-flop’s output would be
2
1
2.5
1.25
Q.8.Which of the following regulator provides output voltage polarity reversal without a transformer
Buck regulator
Boost regulator
Buck-boost regulator
Cuk regulator
Q.9.The polarization required in ground wave propagation is
Horizontal (linear)
vertical (linear)
Circular
Elliptical
Q.10.If the noise figure of a receiver is 1.6, its equivalent noise temperature is
464.00 K
174.00 K
108.75 K
181.25 K
Q.11.The minimum value of the life of a transistor to be used in three section R-C phase shift oscillator is
54.4
44
29
32
Q.12.Multicavity Klystron
is not a microwave device
is not a good low level amplifier because of noise
is not suitable to pulse operation
has a high repeller voltage to insure small transit time
Q.13.The value of M in the end will be
Do 100 I = 1, 2
DO 200 J = 1, 2
M = M + I + J
200 CONTINUE
100 CONTINUE
STOP
END
10
11
12
14
Q.14.In TV system, vertical pulses are separated out from horizontal pulses by the use of
integrator
differentiator
sweep credit
sync separator
Q.15.Fourier’s series expansion of an odd periodic function contains
sine terms only
cosine terms only
Both A and B
None of the above
16. The following programme is run on an 8085 microprocessor,
Memory address in Hex Instruction
2000 LXI SP, 1000
2003 PUSH H
2004 PUSH D
2005 CALL 2050
2008 POP 2050
2009 HIT
As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..
2050, OFFC
2251, OFFC
1025, OCCF
1025, OCCF
Q.17.200 MHz may be classified as
VHF
SHF
UHF
EHF
Q.18.The principles of homogeneity and super-position are applied to :
linear time variant systems
non-linear time variant systems
linear time invariant systems
non-linear time invariant systems.
Q.19.Dislocations in materials are
point defect
line defect
planer defect
surface defects.
Q.20.The binary representation of 5.375 is
111.1011
101.1101
101.011
111.001
Q.21.Which one out of the following instruments should be used to measure 600 kV a.c. voltages?
Hot wire instrument
Electrostatic voltmeter
Moving coil voltmeter
Moving iron voltmeter.
Q.22.For a LC parallel circuit at resonance, all the statements given below are correct except
the line current is maximum at resonance
the branch currents at resonance are equal
the admittance is minimum at resonance
the angle between the branch current is 180oC at resonance.
Q.23.The Taylor series expansion of the function F(x) = x/(1+x), around x=0 is
x+x2+x3+x4+…….
x+x2+x3+x4+…….
2x+42+8x3+16x4+…….
x-x2+x3-x4+…….
Q.24.The mobility of electron in copper is :Given atomic weight = 63.54, density = 8.96 gm/cc, resistivity = 1.7×10–6 W-cm, Avogadro’s number = 6.025 ×1023
30 cm2/V-5
43.28 cm2/V-5
50 cm2/V-5
data not sufficient
Q.25.If a square wave voltage having 5V average value is applied to a low pass filter, then average value of output is
10 V
2.5 V
5 V
0 V
Q.26.Resistivity of electrical conductors is most affected by
temperature
pressure
Composition
all of the above.
Q.27.In CCIR B-system of TV, blanking pulse is placed during
equalizing pulse
retrace interval between each line
retrace period of vertical line
none of the above.
Q.28.The capacity of a channel is
number of digits used in coding
volume of information it can take
maximum rate of information transmission
bandwidth required for information
Q.29.Sometimes microwave signals follow the earth’s curvature. This due to
Ionospheric reflection
Faraday rotation
Ducting
Ionospheric scatter.
Q.30.The function of diplexers bridge in a TV transmitter is
to prevent the loading of several transmitters by video transmitter
to increase the bandwidth
to increase the power output
to increase the efficiency of transmission.
1.where does a body have least weight?
a) at the equator
b) at the poles
c) at earth's center
d) none of these
2. what is the millman's theorem?
3. what happens if a dc motor is fed an ac signal?
4. calculate electron mobility.
5. power MOSFET is voltage controlled or current controlled?
6. if u want a 640 k RAM, what specification should u specify in the drive?
7. max efficiency of a class a amplifier?
8.what r resistors in IC made of?
9. 6 girls and 6 bos sitting randomly in a line. what probability of girls being
together?
10.what is the prob. of two friends having birthdays in same month?
11. (D^2 + 4)y= kx what if PI?
12. lim x-infinity sinx/x
13. express x/(x+1) as taylor's series
14.principle of jet engine
15. why hydraulic systems used ina aircrafts instead of electrical?
16. steel + ? = corrosion-resistant material?
17. what happens to speed of em wave as frequency increases?
18. which char. of em wave does not change when it travels from one mdium to
another?
19. circuit given. find attenuation in db.
20. circuit given. how much feedback?
21. (s-1)/(s+1) is high pass filter/ low pass filter?
22. fastest logic family among rtl, dtl, ttl?
23. in common emitter config. change in iC on changing vBE?
24. what happens if gate voltage of an ON scr is decreased?
25. fermi level change with temperature in n type semiconductor?
26. mosfet has threshold voltage 1v when n+ polysilicon is used in gate. what is
threshold voltage when polysilicon used is of n+ type?
27. simple ckts using zener diode.
28. what is the p+ substrate in an isolated pn junction ic connected to?
29. opamp circuit given. open loop gain=100. closed loop gain=?
30. which type of parameters( h/y/z) suitable in particular application?
31. given parallel LC ckt. find angle between currents in branches at resonance.
32. what is Q of series RLC ckt? (voltage gain/ admttance etc.)
33. resonant freq of parallel RLC ckt. ?
34. thin metal foil inserted between capacitor plates. foil connected to one plate.
change in capacitance?
35. ques on reflection of em wave at air= dielectric interface. dlc const=9
36. what is brewster's angle?
37. why microwave freq not used for ionospheric propagation?
38. uhf range?
39. freq range used in satellite comunication?
40. which ionospheric bands used for commercial purposes?
41. question on transmission line impedance matching?
42. flip- flop d, t 43. convert 32 k pulses to 1 hz pulses using decade counters etc
Q.1.Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is
5.7 mH
5.85 mH
6 mH
6.15 mH.
Q.2.In a 8085 microprocessor system with memory mapped I / 0,
I / 0 devices have 8-bit addresses
I / 0 devices are accessed using IN and OUT instructions
there can be a maximum of 256 input devices and 256 output devices.
arithmetic and logic operations can be directly performed with the I / 0 data.
Q.3.When 2-port networks are connected in parallel, which parameters convenient to use
inverse hybrid
open circuit impedance
short circuit admittance
transmission
Q.4.The number of comparators needed in a 4-bit flash type ADC is
32
8
14
15
Q.5.Line imperfection in a crystal is called
Schottky defect
Frenkel defect
edge dislocation
Miller defect.
Q.6.The frequency modulated (FM) radio frequency range is nearly
250 - 300 MHz
150 - 200 MHz
90 - 105 MHz
30 - 70 MHz
Q.7.A 10 MHz square wave clocks a 5-bit ripple counter. The frequency of third flip-flop’s output would be
2
1
2.5
1.25
Q.8.Which of the following regulator provides output voltage polarity reversal without a transformer
Buck regulator
Boost regulator
Buck-boost regulator
Cuk regulator
Q.9.The polarization required in ground wave propagation is
Horizontal (linear)
vertical (linear)
Circular
Elliptical
Q.10.If the noise figure of a receiver is 1.6, its equivalent noise temperature is
464.00 K
174.00 K
108.75 K
181.25 K
Q.11.The minimum value of the life of a transistor to be used in three section R-C phase shift oscillator is
54.4
44
29
32
Q.12.Multicavity Klystron
is not a microwave device
is not a good low level amplifier because of noise
is not suitable to pulse operation
has a high repeller voltage to insure small transit time
Q.13.The value of M in the end will be
Do 100 I = 1, 2
DO 200 J = 1, 2
M = M + I + J
200 CONTINUE
100 CONTINUE
STOP
END
10
11
12
14
Q.14.In TV system, vertical pulses are separated out from horizontal pulses by the use of
integrator
differentiator
sweep credit
sync separator
Q.15.Fourier’s series expansion of an odd periodic function contains
sine terms only
cosine terms only
Both A and B
None of the above
16. The following programme is run on an 8085 microprocessor,
Memory address in Hex Instruction
2000 LXI SP, 1000
2003 PUSH H
2004 PUSH D
2005 CALL 2050
2008 POP 2050
2009 HIT
As the completion of execution of the program, the program the program counter of the 8085 contains ………, and the stack pointer contains ……..
2050, OFFC
2251, OFFC
1025, OCCF
1025, OCCF
Q.17.200 MHz may be classified as
VHF
SHF
UHF
EHF
Q.18.The principles of homogeneity and super-position are applied to :
linear time variant systems
non-linear time variant systems
linear time invariant systems
non-linear time invariant systems.
Q.19.Dislocations in materials are
point defect
line defect
planer defect
surface defects.
Q.20.The binary representation of 5.375 is
111.1011
101.1101
101.011
111.001
Q.21.Which one out of the following instruments should be used to measure 600 kV a.c. voltages?
Hot wire instrument
Electrostatic voltmeter
Moving coil voltmeter
Moving iron voltmeter.
Q.22.For a LC parallel circuit at resonance, all the statements given below are correct except
the line current is maximum at resonance
the branch currents at resonance are equal
the admittance is minimum at resonance
the angle between the branch current is 180oC at resonance.
Q.23.The Taylor series expansion of the function F(x) = x/(1+x), around x=0 is
x+x2+x3+x4+…….
x+x2+x3+x4+…….
2x+42+8x3+16x4+…….
x-x2+x3-x4+…….
Q.24.The mobility of electron in copper is :Given atomic weight = 63.54, density = 8.96 gm/cc, resistivity = 1.7×10–6 W-cm, Avogadro’s number = 6.025 ×1023
30 cm2/V-5
43.28 cm2/V-5
50 cm2/V-5
data not sufficient
Q.25.If a square wave voltage having 5V average value is applied to a low pass filter, then average value of output is
10 V
2.5 V
5 V
0 V
Q.26.Resistivity of electrical conductors is most affected by
temperature
pressure
Composition
all of the above.
Q.27.In CCIR B-system of TV, blanking pulse is placed during
equalizing pulse
retrace interval between each line
retrace period of vertical line
none of the above.
Q.28.The capacity of a channel is
number of digits used in coding
volume of information it can take
maximum rate of information transmission
bandwidth required for information
Q.29.Sometimes microwave signals follow the earth’s curvature. This due to
Ionospheric reflection
Faraday rotation
Ducting
Ionospheric scatter.
Q.30.The function of diplexers bridge in a TV transmitter is
to prevent the loading of several transmitters by video transmitter
to increase the bandwidth
to increase the power output
to increase the efficiency of transmission.
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