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Posted By : D.Kalaiselvi Rating : +697, -131
Hi Friends

BSNL GE-JTO Recruitment Examination (Test Paper - IV)

1. Reactive current through the inductive load produces
a) Magnetic field      b) Electric field        c) Super magnetic field    d) None

2. When a piece of copper and another of germanium are cooled from room temperature to 80    0 K then the resistance of
a) each of them increases
b) each of them decreases
c) copper increases and germanium decreases
d) copper decreases and germanium increases

3. A capacitance transducer has two plates of area 5 cm    2 each separated by an air gap of 2mm. Displacement sensitivity in pF /cm due to gap change would be
a) 11.1     b) 44.2      c) 52.3     d) 66.3

4. The critical angle in degrees, for an electromagnetic wave passing from Quartz (m = m0, Î=4Îo) into air is
a) 15     b) 30    c) 45    d) 90

5. When an RC driving point impedance function has zeros at s= -2 and s=-5 then the admissible poles for the function would be
a) s = 0; s = -6       b) s = -1; s = -3     c) s = 0; s = -1    d) s = -3; s = -4

6. A capacitor used for power factor correction in single- phase circuit decreases
a) the power factor
b) the line current
c) Both the line current and the power factor
d) the line current and increases power factor

7. The unit of inductance is
a) ohm    b) inductive reactance    c) inducta    d) Henry

8. Which type of by-pass capacitor works best at high frequencies
a) electrolytic  b) mica  c) ceramic  d) plexiglass

9. The usual value of the surge impedance of a telephone line is
a) 600 W     b) 500 W     c) 75 W    d) none

10. Telemetering is a method of
a) counting pulses, sent over long distances
b) transmitting pictures from one place to another
c) transmitting information concerning a process over a distance
d) None

11. In an unbiased P-N junction thickness of depletion layer is of the order of
a) 0.005 mm   b) 0.5 mm    c) 5 mm    d)     10-10 m

12. One of the semiconductor device, which behaves like two SCRs is
a) UJT    b) triac     c) JFET    d) MOSFET

13. The following, which is not an advantage of semiconductor strain gauges as compared to conventional strain gauges, is
a) excellent hysterists characteristics
b) least sensitive to temperature changes
c) high fatigue life
d) smaller size

14. The fundamental ripple frequency of a half wave 3F rectifier with a 3F supply of frequency 50 Hz is
a) 150 Hz  b) 50 Hz   c) 100 Hz   d) 250 Hz.  

15. For an FR biased PNP transistor
a) base is negative with respect to emitter
b) collector is positive with respect to emitter
c) collector is a little more positive than base
d) base is a little less positive with respect to emitter than collector

16. With normal operation of a JFET one can get     IDss
a) the maximum drain current
b) the minimum drain current
c) normal drain current
d) none

17. An SCR is a semiconductor device made up of
a) Four N type layers
b) Two P types and three N type layers
c) Two P type and two N type layers
d) Three P type and one N type layers

18. For a UJT, if R1 = resistance from emitter to base 1, R2 = resistance from emitter to the base 2 and RBB = R1 + R2 then the intrinsic stand off ratio (h) is
a) R1/R2         b)  R1/RBB       c) R2 /R1   d)  R2/RBB
19. As the drain voltage is increased for a junction FET in the pinch off region then the drain current
a) becomes zero     b) abruptly decreases  c) abruptly increases   d) remains constant

20. 20 When the energy gap of a semiconductor is 1.1eV then it would be
a) opaque to the visible light
b) transparent to the visible light
c) transparent to the infrared radiation
d) opaque to the infrared radiation

21. The equivalent capacitance across ab will be

   a)  0.2 μF      b) 0.1 μF     c) 0.5 μF    d) 0

22. In the following fig. the power dissipated is maximum when the value of Rx is

a) 33.4 K     b) 17.6 K      c) 10 K     d) 5 K

23. The transfer function of a low pass RC network is

24. The total capacitance across points 'a' and 'b' in the given figure is

a) 1.66 μF     b) 2.66 μF    c) 3.5 μF   d) 4.5 μF
25. The load resistance needed to extract maximum power from the following circuit is

a) 2W      b) 9W   c) 6W     d) 18W

26. Which one of the following conditions for z parameters would hold for a two port network containing linear bilateral passive circuit elements
a) z11 = z22       b) z12z21 = z11z22   c) z11z12 = z22z21   d) z12 = z21

27. In the network shown, the switch is opened at t = 0. Prior to that, the network was in  the steady state, Vs(t) at t = 0 is

a) 0      b) 5V    c) 10V    d) 15V

28. Which of the following statements are correct
1. Tellegen's theorem is applicable to any lumped network
2. The reciprocity theorem is applicable to linear bilateral networks.
3. Thevenin's theorem is applicable to two terminal linear active networks.
4. Norton's theorem is applicable to two terminal linear active networks.
a) 1, 2 and 3
b) 1, 2, 3 and 4
c) 1, 2 and 4
d) 3 and 4

29. Which one of the following transfer functions represents the critically damped system ?
a) H1(s)=1/(s2+4s+4)     b) H2(s)=1/(s2+3s+4)      
c) H3(s)=1/(s2+2s+4)         d)  H4(s)=1/(s2+s+4)
30. When the respective coil impedance of the circuit shown in the fig. is are Z1 = (5 + j8)W and Z2=(3+j8) then the input impedance of the circuit will be

a) (8 + 16j)W     b) (2 + j0)W     c) (15 + 64j)W      d) (8 + 0j)W

31. One of the following statement which is not correct
a) In case of an antenna, the radiation resistance and loss resistance are not two different quantities.
b) The loss resistance includes loss by eddy currents, improper earth connections, insulation leakages etc) but not I2R losses
c) Radiation resistance varies directly as square root of the frequency
d) None of the above

32. Ultraviolet radiation emitted when electron jumps from an outer stationary orbit to
a) first stationary orbit
b) second stationary orbit
c) third stationary orbit
d) fourth stationary orbit

33. When the signal is propagated in a waveguide which has a full wave of electric intensity change between the two farther walls and no component of the electric field in the direction of propagation then the mode is
   a)  TE11     b) TE10    c)  TM22     d) TE20

34. Consider the following statements pertaining to parabolic antenna
1. It is commonly used above 1GHz
2. It get’s circularly polarized
3. It’s radiation pattern is highly directional
4. It’s radiation pattern is cardiod
of these statements-
a) 1,2 and 4 are correct
b) 1 and 3 are correct
c) 1,2 and 3 are correct
d) 2 and 4 are correct

35. When a vertical dipole antenna is used in conjunction with a loop antenna for direction finding, then the field pattern obtained will be
Ans. a

36. When one end of a loss less transmission line of length 3/8 l and characteristic impedance R0 is short circuited and the other end is terminated in Ro then the impedance at l/8 away from the end terminated in R0 is
a) Zero     b) R0      c)  R0/2    d) Infinite

37. For transmission of wave from a dielectric permittivity Î1 into dielectric medium of lower permittivity Î2 (Î1 > Î2) the critical angle of incidence Qc (relative to the interface) is given by
Ans. c

38. A transmission line has primary constants R, L, G and C and secondary constants Z0 and g (= a + jb) if the line is loss less then.
Ans. d

39. The intrinsic impedance of a free space is
Ans. a

40. One of the following which is a low gain but omni directional antenna is
a) discone    b) log-periodic   c) loop    d) helical

41. Electronic voltmeters have
a) high input impedance  b) low input impedance  c) zero input impedance  d) none

42. Which of the following statement about impulse voltage is true ?
a) An impulse voltage is an unidirectional voltage.
b) In chopped impulse voltage, flashover does not occur.
c) Time taken to rise is exactly equal to the time taken to fall.
d) RMS value of impulse voltage is always less than 50% of average value.

43. The precision of an instrument indicates its ability to reproduce a certain reading with a given
a) drift    b) resolution     c) shift.    d) consistency

44. In heterodyne digital conductor, the input signal is heterodyned to a
a) higher frequency   b) lower frequency  c) both a and b)   d) none

45. In a digital measuring device, if the input electrical signal is in the frequency range dc to fmax Hz, then it must be sampled at a rate of
a) fmax times/sec     b) fmax times/ses    c) every 2fmax/sec   d) 2 fmax times/sec

46. Moving Iron instruments measures the rms value of
a) a direct quantity
b) an alternating quantity
c) a virtual quantity.
d) none.

47. One of the following instruments which is used almost exclusively to measure radio frequency current is
a) Moving coil meter
b) Rectifier-type moving coil meter
c) Iron-vane meter
d) Thermocouple meter

48. A good ohmic contact on a p- type semiconductor chip is formed by introducing
a) gold as an impurity below the contact
b) a high concentration of donors below the contract
c) a high concentration of acceptors below the contact
d) a thin insulator layer between the metal and semiconductor.

49. The use of thermocouple meters for ac measurement leads to a meterscale which is
a) linear   b) square law    c) logarithmic   d) exponential

50. If low pressure of the order of 10-6mm of Hg is to be measure then the instrument of choice would be
a) compound pressure gauge
b) thermocouple vacuum gauge
c) pirani gauge
d) ionization type vacuum gauge

51. In the given circuit if the power dissipated in the 6W resister is zero then V is
       a)  20 √2 450       b) 20 √2 300

52. The equivalent circuit of a resistor is shown in the given figure.

The resistor will be non inductive if
   a)  R=L/C      b) R=√(L/C)      c) L=CR2     d) C=LR2

53. SCR turns OFF from conducting state to blocking state on
a) reducing gate current
b) reversing gate voltage
c) reducing anode current below holding current value
d) applying ac to the gate

54. Static V-I characteristics of an SCR with different gate drives applied to the gate are indicated by
a) I92 > I 91 > I 90
b) V92  > V91 > V90
c) P92  > P91 > P90
d) either a or b

55. Each diode of a 3 phase, 6-pulse bridge diode rectifier conducts for
a) 60 deg      b) 120 deg    c) 180 deg     d) 90 deg  

56. A load, consisting of R = 10W and wL = 10W is being fed from 230 V, 50 Hz  source through a 1 phase voltage controller. For a firing angle delay of 30 deg, the rms value of load current would be
a) 23 A           b) 23/√A     c) >23/√A      d) <23/√A    

57. The total number of SCRs conducting simultaneously in a 3 phase full converter with overlap considered has the sequence of
a) 3,3, 22     b) 3, 3, 3, 2      c) 3, 2, 3, 2     d) 2, 2, 2, 3

58. A single phase voltage controller, using two SCRs in antiparallel is found to be operating as a controlled rectifier. This is because
a) load is R and pulse gating is used
b) load is R and high frquency carrier gating is used
c) load is RL and pulse gating is used
d) load is RL and continuous gating is used

59. The inverse Fourier Transform of
Ans. b

60. In a GTO anode current begins to fall when gate current
a) is negative peak at time t = 0
b) is negative peak at t = shortage period ts
c) just begins to become negative at t = 0
d) is negative peak at t = (ts + fall time)

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