Placement Papers - BSNL

BSNL GE-JTO Recruitment Examination
(Paper - 2)


51. The SCR ratings di/dt in A/m sec and dv/dt in n/m sec, may vary, respectively between-
a.) 20 to 500, 10 to 100
b. )both 20 to 500
c.) both 10 to 100
d.) 50 to 300, 20 to 500

52. Match the given controlled rectifiers with 50 Hz supply
a. )1 phase full converter with source inductance
b. )3 phase full converter
c.)3 phase semiconductor
d. )3 phase halls wave converter

53. For natural or forced commutation the cyclo converters (CCs) requires as under.
a) natural commutation in both step up and step down CCs
b.) forced commutation in both step up and step down CCs
c.) forced commutation in step up CCs
d). forced commutation in step down CCs

54. The peak inverse voltage in ac to dc converter system is highest in-
a). single phase full wave mid point converter
b). single phase full converter
c) 3 phase bridge converter
d). 3 phase half wave converter.


55. A single phase full converter feeds power to RLE load with R = 6 W L = 6 MH and E = 60 V. The ac source voltage is 230 V, 50 Hz, For continuous conduction, the average value of load current for a firing angle delay of 50 is
a.)12.181 A
b). 14.81 A
c). 16.76 A
d.) 32.40 A

56. Which one of the following is the Fourier transform of the signal given in fig. B if the Fourier transform of the signal in fig A is given by -


57. What is 215 complement of 00011100-
a.) 11100011
b.) 10001100
c.) 11100100
d.) 10000111

58. In C programming a expression contains relational operators, assignment operators and arithmetic operators if parentheses is absent then execution follows
a.) assignment, relational, arithmatic
b.) arithmatic, relational, assignment
c.) relational, arithmatic, assignment
d.) assignment, arithmatic, relational

59. In semiconductor memory information stored in form-
a.) binary
b.) hexadecimal
c.) octal
d.) ASCII

60. ip to Not gate gives o/p as-
a ) inversion of some bits
b.) 2?s complement of ip
c.) 1?s complement of ip
d.) o/p is some as ip

61. A negative logic means-
a .)logic 0 and 1 are represented by a +ve voltage respective
b). logic 0 and 1 are presented as ?ve and +ve voltage
c. )logic 0 voltage is higher than logic 1 voltage level
d.) logic 0 voltage is lower than logic 1 voltage level

62. For designing D flip flop from SR FF a circuit is aloud at 01p of SR FF is-
a.) AND
b.) OR
c.) NOR
d.) NOT

63.The transistor shown in fig is
a. ) Silicon, NPN with Ic = 0.5 mA
b.) Silicon PNP with Ic = 0.5 mA
c.) Germanium PNP with IE = 0.5 mA
d.) Germanium NPN with Ic=0.5 mA

64.A 20,000 Ohms per volt meter will deflect full-scale with a current of -
a.) 50 mA
b.) 50 mA
c.) 100 mA
d.) 1000 mA

65. A plate modulated class ?CRF power amplifier produces 100 KW of radiated power at 100 % modulation. The modulating audio amplifier supplies approximately -------- kW of this power-
a.)50
b).33
c).22
d).11

66..An amplifier without feedback has a distortion of 15 % and gain of 40. When 10% negative feedback is applied the distortion will become-
a.) 50 %
b). -45 %
c). 3%
d). -5%

67. MODEM implies-
a.)Modulator at transmitting side and ditector at the receiving side
b.)Which deals with analog signals and shows digital information
c.)Analog to digital at transmitting side and digital to analog at a receiving side
d).A device which deals with digital signals only

68. Twisted ring and ring counters are examples of ?
a. )Synchronous counters
b.) Asynchronous counters
c.) both a and b
d.) None of the above

69. Specify Non characteristic flip flop in the following ?
a.) The outputs are complement of each other
b.) The flip flop has two input signals
c.) The flip flop has two output signals
d). The flip flop is a bistable devise with only two stable states

70. The voltage obtained when digital input is 001 is a 3 bit R-2R ladder DIA converter is-
a.) VR/22
b.) VR/21
c.) VR/23
d.) none of the above

71. Identify NOT an octal number-
a.) 19
b). 15
c.) 77
d.) 101

72. The set of binary digits 01000100 represent\'s-
a.) number 6810 in a pure binary computer
b.) number 44 in 8421 BCD code
c) Both a and b
d.) None of the above

73. The system matrix of a continuous time system, described in the state variable form is ?

The system is stable for all values of x and y satisfying ?
a.)x < 1/2, y < 1/2
b). x < 0, y < 2
c. )x > 1/2 , y >0
d.) x < 0 , y < 1/2

74. The break away and break in point in the root locus for open loop transfer function G(S) H(S) = are located respectively at ?
a). ?2 and -1
b). ?2.47 and ?3.77
c.) ?4.27 and ?7.73
d.) ?7.73 and ?4.27

75. The transfer function for the given system shown in figure is ?

76. The type and order of the system whose Nyquist plot is shown in fig is-
a.)0.1
b.) 1,2
c.) 0,2
d). 2,1

77. The overall transfer function in a second order is given by-
Its resonant frequency is -
a.) 2
b.)
c).
d.) 3

78. The detection of an AM waveform in an Envelope ?
a.)One side band and full amplitude carrier are needed
b.) Both side bands and full amplitude carrier are needed
c). Only two side bands are needed
d). Upper side band and part of carriers are needed

79. Satellite used for intercontinental communication is known as ?
a.) Comsat
b). Dom sat
c.) Mari sat
d). Intelsat

80. Mark out non submarine cable ?
a. )TAT ? 7
b.) INTELSAT V
c.) ATLANTIS
d. )CANTAT 2

81. The capacity of an analog communication channel with 4kHz bandwidth and 15 dB SNR is approximately-
a). 20,000 bps
b). 16,000 bps
c.) 10,000 bps
d.) 8,000 bps

82. The blind speed of an MTl radar can be avoided by changing the-
a.) Carrier frequency
b.) Pulse repetition frequency
c. )Antenna rotation rate
d.) Transmitted power

83. The output voltage in a feedback series regulator circuit is regulated by controlling the-
a.) Magnitude of the input voltage
b.) Gain of the feedback transistor
c.) Reference voltage
d.) Voltage drop across the series pass transistor

84. Indicate the signal not transmitted in colour TV-
a.) Y
b.) Q
c.) R
d.) I

85. As frequency of singal increases-
a.) Directivity increases & beam width increases
b.) Directivity & beam width decreases
c.) Directivity increases & beam width decreases
d.) Directivity decreases & beam width increases

86. The number of hardware interupts (which require an external signal to interrupt) present in on 8085 mP are
a). 1
b). 4
c.) 5
d.) 13

87. Highest priority interupt is-
a. )INTR
b. )RST 7.5
c. )RST 6.5
d. )TRAP

88. One instruction cycle means-
a. )Time require to execute set of instructions
b. )Time require to execute one instruction
c.) Time require to complete one operation of accessing memory, or I/o
d.) None of above

89. If the clock freq. is 5 mH3 how much time is required to execute on instruction of 18 T-states-
a. )3.6 msec.
b.) 36 m sec.
c.) 36 m sec.
d.) 36 sec.

90. In data transfer operation which flog get affected-
a. )zero flog
b. )carry flog
c. )sign flog.
d.) none

91. CMP instruction comes under group -
a. )Data transfer
b. )Brouching operations
c). Machine control operation
d.) logical operations

92. The logic operation-
a.) are performed in relation to content of Accemce lotor
b).can be performed derectly with content of the register.
c.)are performed without content of a
d.)none of above.

93. What happen when PUSH instruction executed -
a.) data retrieved from stock to register
b.) data from register saved on the stock.
c.) 16 bit address of instruction saved on stock.
d.) 16 bit address from stock retrieved

94. SIM stands for-
a. ) serial interface memory
b.) set interrupt mosk
c. ) set if minus
d.) set internal memory

95. Maximum clock frequency required to operate 8085-
a. )2 MHz
b.) 3 MHz
c) 6 MHz
d. )9 MHz

96. ASCII code is-
a). 7 bit
b). 8 bit
c.)16 bit
d.) 32 bit.

97. In memory mapped I/O address lines are-
a. ) 8
b.) 16
c.) 32
d.) 64

98. The parity bit adding technique is used for -
a. )Indexing
b. )Coding
c. )Error detection
d. )Controlling

99. A demultiplexer-
a. )has multiple i/p and single o/p
b.) has single i/p and multiple o/p
c.) has multiple i/p and multiple o/p
d.) has single i/p and single o/p


100. Subroutines are useful-
a. )to reduce storage requirements
b.) to increase programming speed and reduce storage
c.) most applications are same
d.) but increases expense

 


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