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vizag steel 2011 previous paper
1.An oscillator is basically an amplifier with which of the following ?
a)infinite gain
b) zero gain
c) low gain
d) large gain .
2. what is the lowest fipple frequency in case of full wave rectifier?
a) 2f
b) 4f
c) 0.5f
d) f
3. which of the following does a double turned circuit amplifier provide?
a) less harmonic distortion
b) more flat response for all frequencies
c) high gain for pass band frequencies
d) more flat response for all pass band.
4. FM broadcast band lies in which band?
a) HF band
b) VHF band
c) UHF band
d) SHF band
5. A high Q tuned circuit in a tuned amplifier permits it to have which of the following?
a) high selectivity
b) high frequency range
c) high sensitivity
d) high fedelity
6. FET phase shift oscillator uses which of the following?
a) voltage series feedback
b) current shunt feedback
c) voltage shunt feedback
d) current series feedback
7. which one of the following is not the purpose of modulation ?
a) increase in signal power
b) multiplexing
c) effective radiation
d) narrowbanding
8. If a carrier is amplitude modulated to a depth of 40%. what will the increase in power be?
a) 80%
b) 40%
c) 20%
d) 15%
9. which of the following AM techniques have greater signal power and reduction of bandwidth?
a) SSB
b) USB
c) DSB-SC
d) none of the options
10.what is the image frequency of a station of frequency 1200 KHz?
a) 910 KHz
b) 1290 KHz
c) 2110 KHz
d) 3230 KHz
11. figure of merit is alwayz unity in case of which of the following?
a) SSB-SC
b) FM
c) AM
d) all the options
12. which of the following hexadecimal numbers is just prior to F52B?
a) E52A
b) F51B
c) F52B
d) F52A
13. which principle does linear system obey?
a) superposition
b) homogeneity
c) superposition & homogeneity
d) none of the options
14. steady state error for type 0 system with ramp input is?
a) 0
b) 1
c) infinity
d) 0.5
15. if damping factor is more than 1, what is the system termed as ?
a) over damped
b) underdamped
c) undamped
d) cannot be catagorised
16. what is the steady state error for 1st order systems(type 1) with step input?
a) 0
b) 1
c) infinity
d) 0.5
17. in synchros the shape of transmitter & receiver are as which of the following ?
a) transmitter -dumbell shape , receiver -cylindrical
b) transmitter - cylindrical , receiver -dumbell shape
c) transmitter- cylindrical, receiver - cylindrical
d) transmitter- dumbell shape, receiver - dumbell shape
18.what is the effect of derivative compensation on settling time?
a) reduces settling time
b) increase settling time
c) no effect on settling time
d) keeps settling time constant
19. for stable feedback system, which of the following conditions satisfy?
a) phase margin is always positive
b) phase margin is always negative
c) phase margin is always zero
d) there is no relation
20. The effect of integral compensation is which of the following?
a) to reduce the errror
b) to increase the error
c) to keep the error constant
d) to no effect on error
21. A system is more stable if which of the following satisfy?
a) gain margin is large & phase margin is large
b) gain margin is least & phase margin is large
c) gain margin is least & phase margin is least
d) gain margin is large & phase margin is least
22. Permanent magnet motor is preferred in DC servo application due to which of the following ?
a) high torque to inertia ratio
b) low torque to inertia ratio
c) constant torque to inertia ratio
d) high torque & high inertia
23. In designing AC servo motors , what is the ideal X/R ration for stable operation ?
a) low
b) high
c) medium
d) no particular ration
24. AC current can induce voltage because of which of the following ?
a) varying magnetic field
b) constant magnetic field
c) high peak value
d) stronger magnetic field
25. what is the resulting vector when two sinusoidally time varying vectors having different amplitude and phases are added up?
a) circular polarized
b) linearly polarized
c) ellitipically polarized
d) none of the options
26. what does plasma signify?
a) liquid medium
b) electronic medium
c) gaseous medium
d) solid dielectric
27. what is the wavelength of an electromagnetic wave in a waveguide?
a) directly proportional to the group
b) greater than in free space
c) less than in free space
d) inversely proportional to the phase velocity
28. what happens to an EM wave incident on a perfect conductor?
a) it is fully reflected
b) it is fully transmitted
c) it is fully absorbed
d) it is partially transmitted and partially reflected
29. when an EM wave is incident from a more dense medium to less dense medium at an angle equal to or exceeding the critical angle , the wave suffers
a) total internal transmission
b) total internal refraction
c) total internal reflection
d) none of the options
30. The EM field and current are concentrated close to the surface of the conductor. The phenomenon is called
a) ohm's effect
b) faraday's effect
c) parametric dispersion
d) propagation dispersion
31. A dominant wave should have which of the following ?
a) lowest cut-off frequency
b) no attenuation
c) no phase shift
d) highest cut-off frequency
32. what does poynting vector signify?
a) power density vector producing electromagnetic field
b) current density vector producing electromagnetic field
c) power density vector producing electrostatic field
d) current density vector producing electrostatic field
33. A circular polarized wave results when
a) magnetic of two waves are same but phase difference is 90'
b) magnitude of two waves are same but phase difference is zero
c) phases of two waves are the same
d) magnitude of the two waves are the same
34. antenna reciprocity is used in which of the following ?
a) radio broadcast
b) multiplex telemetry
c) aircraft instrumentation
d) TV broadcast
35.An LC circuit resonant at 100KHz has a Q of 100. What will be the value of bandwidth between half power points?
a) 200 KHz between 900 & 1100 KHz
b) 5 KHz between 995 & 1000 KHz
c) 10 KHz between 995 & 1005 KHz
d) 1 KHz between 1000 & 1010 KHz
36. Surface integral of a surface can be considered as which of the following?
a) double integral of surface
b) integral of surface
c) differential of weight
d) differential of volume
37. what is signal to noise ratio equal to ?
a) square of signal volt to noise volt ratio
b) signal volt to noise volt ratio
c) cube of signal volt to noise volt ratio
d) no relation
38. if the frequency of the supply increases ,what happens to the error of the measuring instrument?
a) increases
b) decreases
c) remains constant
d) no relation
39. The value of percentage error will be greater when voltage being measured is
a) smaller
b) at full range
c) at intermediate range
d) no relation
40. An error due to which of the following item gets corrected in the reading of a compensated wattmeter?
a) an error due to the frequency
b) an error due to the friction
c) an error due to the power consumed in current coil
d) an error due to the power consumed in potential coil
41. which of the following is not the reason for creeping in energy meter?
a) over compensation for friction
b) over voltage
c) vibrations
d) repeatablity
42. In two wattmeter method of measurement, if both the wattmeter show equal reading then what will be the power factor?
a) power factor is unity
b) power factor is zero
c) power factor is half
d) no relationship
43. what kind of transformet open circuit should be avoided in secondary side?
a) current transformer
b) potential transformer
c) distribution transformer
d) power transformer
44. For a series RLC circuit , when the Q value is high , what happened to the pass band ?
a) it is narrow
b) it is wide
c) no effect on the pass band
d) pass band reduces to zero
45. De sauty's bridge is used to measure which of the following ?
a) resistance
b) voltage
c) capacitance
d) inductance
46. which of the instruments is dependent of waveform & frequency of AC supply?
a) hot wire instrument
b) thermocouple instrument
c) moving iron instrument
d) induction type instrument
47. permanent moving coil instruments measures which of the following ?
a) DC only
b) AC only
c) AC & DC only
d) none of the options
48. The eddy current loss does not depend upon the following
a) flux density
b) frequency
c) lamination thickness
d) voltage
49. True power is measured in which of the following ?
a) VA
b) watt
c) VAR
d) Amp
50. Field control method for DC motor speed control is used to obtain what kind of speed?
a) above normal speed
b) below normal speed
c) equal to normal speed
d) no change in speed
51. what is the voltage induced into the conductors of an armature that is in opposition to the applied voltage known as?
a) back emf
b) forward emf
c) residual emf
d) armature voltage
52. The direction of rotation of a DC motor is reversed by reversing the current through which of the following ?
a) armature winding
b) field winding
c) both a and b
d) can't be reversed
53. Identify the following insulation classes where NEMA has ambient temperature of 40 deg C
a) 40' <= temp<= 100'
b) 40'<= temp<= 120'
c) 40' <= temp<= 145'
d) 40' <= temp<= 165'
54. which of the following is the condition for obtaining maximum output power from DC motor?
a) Eb=2Ia Ra
b) Eb= 0.5V
c) Eb=5
d) Eb=IaRa
55. Cogging and Crawling
b) zero gain
c) low gain
d) large gain .
2. what is the lowest fipple frequency in case of full wave rectifier?
a) 2f
b) 4f
c) 0.5f
d) f
3. which of the following does a double turned circuit amplifier provide?
a) less harmonic distortion
b) more flat response for all frequencies
c) high gain for pass band frequencies
d) more flat response for all pass band.
4. FM broadcast band lies in which band?
a) HF band
b) VHF band
c) UHF band
d) SHF band
5. A high Q tuned circuit in a tuned amplifier permits it to have which of the following?
a) high selectivity
b) high frequency range
c) high sensitivity
d) high fedelity
6. FET phase shift oscillator uses which of the following?
a) voltage series feedback
b) current shunt feedback
c) voltage shunt feedback
d) current series feedback
7. which one of the following is not the purpose of modulation ?
a) increase in signal power
b) multiplexing
c) effective radiation
d) narrowbanding
8. If a carrier is amplitude modulated to a depth of 40%. what will the increase in power be?
a) 80%
b) 40%
c) 20%
d) 15%
9. which of the following AM techniques have greater signal power and reduction of bandwidth?
a) SSB
b) USB
c) DSB-SC
d) none of the options
10.what is the image frequency of a station of frequency 1200 KHz?
a) 910 KHz
b) 1290 KHz
c) 2110 KHz
d) 3230 KHz
11. figure of merit is alwayz unity in case of which of the following?
a) SSB-SC
b) FM
c) AM
d) all the options
12. which of the following hexadecimal numbers is just prior to F52B?
a) E52A
b) F51B
c) F52B
d) F52A
13. which principle does linear system obey?
a) superposition
b) homogeneity
c) superposition & homogeneity
d) none of the options
14. steady state error for type 0 system with ramp input is?
a) 0
b) 1
c) infinity
d) 0.5
15. if damping factor is more than 1, what is the system termed as ?
a) over damped
b) underdamped
c) undamped
d) cannot be catagorised
16. what is the steady state error for 1st order systems(type 1) with step input?
a) 0
b) 1
c) infinity
d) 0.5
17. in synchros the shape of transmitter & receiver are as which of the following ?
a) transmitter -dumbell shape , receiver -cylindrical
b) transmitter - cylindrical , receiver -dumbell shape
c) transmitter- cylindrical, receiver - cylindrical
d) transmitter- dumbell shape, receiver - dumbell shape
18.what is the effect of derivative compensation on settling time?
a) reduces settling time
b) increase settling time
c) no effect on settling time
d) keeps settling time constant
19. for stable feedback system, which of the following conditions satisfy?
a) phase margin is always positive
b) phase margin is always negative
c) phase margin is always zero
d) there is no relation
20. The effect of integral compensation is which of the following?
a) to reduce the errror
b) to increase the error
c) to keep the error constant
d) to no effect on error
21. A system is more stable if which of the following satisfy?
a) gain margin is large & phase margin is large
b) gain margin is least & phase margin is large
c) gain margin is least & phase margin is least
d) gain margin is large & phase margin is least
22. Permanent magnet motor is preferred in DC servo application due to which of the following ?
a) high torque to inertia ratio
b) low torque to inertia ratio
c) constant torque to inertia ratio
d) high torque & high inertia
23. In designing AC servo motors , what is the ideal X/R ration for stable operation ?
a) low
b) high
c) medium
d) no particular ration
24. AC current can induce voltage because of which of the following ?
a) varying magnetic field
b) constant magnetic field
c) high peak value
d) stronger magnetic field
25. what is the resulting vector when two sinusoidally time varying vectors having different amplitude and phases are added up?
a) circular polarized
b) linearly polarized
c) ellitipically polarized
d) none of the options
26. what does plasma signify?
a) liquid medium
b) electronic medium
c) gaseous medium
d) solid dielectric
27. what is the wavelength of an electromagnetic wave in a waveguide?
a) directly proportional to the group
b) greater than in free space
c) less than in free space
d) inversely proportional to the phase velocity
28. what happens to an EM wave incident on a perfect conductor?
a) it is fully reflected
b) it is fully transmitted
c) it is fully absorbed
d) it is partially transmitted and partially reflected
29. when an EM wave is incident from a more dense medium to less dense medium at an angle equal to or exceeding the critical angle , the wave suffers
a) total internal transmission
b) total internal refraction
c) total internal reflection
d) none of the options
30. The EM field and current are concentrated close to the surface of the conductor. The phenomenon is called
a) ohm's effect
b) faraday's effect
c) parametric dispersion
d) propagation dispersion
31. A dominant wave should have which of the following ?
a) lowest cut-off frequency
b) no attenuation
c) no phase shift
d) highest cut-off frequency
32. what does poynting vector signify?
a) power density vector producing electromagnetic field
b) current density vector producing electromagnetic field
c) power density vector producing electrostatic field
d) current density vector producing electrostatic field
33. A circular polarized wave results when
a) magnetic of two waves are same but phase difference is 90'
b) magnitude of two waves are same but phase difference is zero
c) phases of two waves are the same
d) magnitude of the two waves are the same
34. antenna reciprocity is used in which of the following ?
a) radio broadcast
b) multiplex telemetry
c) aircraft instrumentation
d) TV broadcast
35.An LC circuit resonant at 100KHz has a Q of 100. What will be the value of bandwidth between half power points?
a) 200 KHz between 900 & 1100 KHz
b) 5 KHz between 995 & 1000 KHz
c) 10 KHz between 995 & 1005 KHz
d) 1 KHz between 1000 & 1010 KHz
36. Surface integral of a surface can be considered as which of the following?
a) double integral of surface
b) integral of surface
c) differential of weight
d) differential of volume
37. what is signal to noise ratio equal to ?
a) square of signal volt to noise volt ratio
b) signal volt to noise volt ratio
c) cube of signal volt to noise volt ratio
d) no relation
38. if the frequency of the supply increases ,what happens to the error of the measuring instrument?
a) increases
b) decreases
c) remains constant
d) no relation
39. The value of percentage error will be greater when voltage being measured is
a) smaller
b) at full range
c) at intermediate range
d) no relation
40. An error due to which of the following item gets corrected in the reading of a compensated wattmeter?
a) an error due to the frequency
b) an error due to the friction
c) an error due to the power consumed in current coil
d) an error due to the power consumed in potential coil
41. which of the following is not the reason for creeping in energy meter?
a) over compensation for friction
b) over voltage
c) vibrations
d) repeatablity
42. In two wattmeter method of measurement, if both the wattmeter show equal reading then what will be the power factor?
a) power factor is unity
b) power factor is zero
c) power factor is half
d) no relationship
43. what kind of transformet open circuit should be avoided in secondary side?
a) current transformer
b) potential transformer
c) distribution transformer
d) power transformer
44. For a series RLC circuit , when the Q value is high , what happened to the pass band ?
a) it is narrow
b) it is wide
c) no effect on the pass band
d) pass band reduces to zero
45. De sauty's bridge is used to measure which of the following ?
a) resistance
b) voltage
c) capacitance
d) inductance
46. which of the instruments is dependent of waveform & frequency of AC supply?
a) hot wire instrument
b) thermocouple instrument
c) moving iron instrument
d) induction type instrument
47. permanent moving coil instruments measures which of the following ?
a) DC only
b) AC only
c) AC & DC only
d) none of the options
48. The eddy current loss does not depend upon the following
a) flux density
b) frequency
c) lamination thickness
d) voltage
49. True power is measured in which of the following ?
a) VA
b) watt
c) VAR
d) Amp
50. Field control method for DC motor speed control is used to obtain what kind of speed?
a) above normal speed
b) below normal speed
c) equal to normal speed
d) no change in speed
51. what is the voltage induced into the conductors of an armature that is in opposition to the applied voltage known as?
a) back emf
b) forward emf
c) residual emf
d) armature voltage
52. The direction of rotation of a DC motor is reversed by reversing the current through which of the following ?
a) armature winding
b) field winding
c) both a and b
d) can't be reversed
53. Identify the following insulation classes where NEMA has ambient temperature of 40 deg C
a) 40' <= temp<= 100'
b) 40'<= temp<= 120'
c) 40' <= temp<= 145'
d) 40' <= temp<= 165'
54. which of the following is the condition for obtaining maximum output power from DC motor?
a) Eb=2Ia Ra
b) Eb= 0.5V
c) Eb=5
d) Eb=IaRa
55. Cogging and Crawling
Wednesday, March 9, 2011
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