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BEL Placement Papers-Free Download

71. Noise output from the receiver decreases uniformly with noise side band frequency for

a. Frequency modulation-Answer

b. Amplitude modulation

c. Pulse amplitude modulation

d. None of these

72. In amplitude modulation the maximum permissible modulation index is

a. Unity -Answer

b. 100

c. infinity

d. None of these

73. In frequency modulation the maximum permissible modulation index is

a. Unity

b. 50 -Answer

c.1000

d. no limit

74. In FM transmission and reception, the pre-emphasis and de-emphasis are used to improve the

a. Signal to noise ratio-Answer

b. Frequency response of the receiver

c. Frequency response of the transmitter

d. The sensitivity of the transmitter

75. De-emphasis network uses the combination of

a. R-L

b. R-C -Answer

c. R-L-C

d. Transformer

76. The usage of micro sec for defining emphasis is a standard practice but this micro sec definition means

a. 3 dB point of the network means-Answer

b. mid point of the network response

c. roll off the network response

d. the stop band ripple of the network response

77. Delayed AGC is applied

a. For all singal strength

b. For singal strength exceeding a specified limit-Answer

c. For low singal strength

d. For FM receiver

78. Selectivity means

a. Bandwidth-Answer

b. Gain

c. Modulation index

d. None of these

79. Narrow bandwidth broadcast reduces

a. The quality and noise-Answer

b. Quality alone

c. Noise alone

d. Quality and intelligibility

80. Squelch means keeping the receiver

a. ON in the absence of carrier

b c. To remove AGC

d. Increase the AGC

81. Let Z be the series impedance and Y be the shunt admittance of the transmission line, then the characteristic impedance

a. ÖZY

b.ÖY/Z

c. ÖZ/Y -Answer

d.All the above

82. Noise figure of an amplifier is defined as

a. Input SNR output SNR

b. Input SNR / output SNR-Answer

c. Output SNR / input SNR

d. Input SNR / gain

83. A broadcast radio transmitter radiates 10 KW power when modulation is 60%. Its carrier power will be

a. 8.47KW -Answer

b.8.92KW

c. 8.31KW

d.10.00KW

84. In AM transmission antenna current is 8 Ampere at zero modulation indexes but increased to 8.93 Ampere when modulated on single sine wave. Then the % of modulation is approximately

a. 70.1% -Answer

b. 80.1%

c. 65.1%

d. 10.0%

85. In AM transmission antenna current is 8 Ampere at zero modulation index. At 80% modulation index the antenna current will be

a. 10.00A -Answer

b. 8.72A

c. 9.19A

d. 9.79A

86. If two sine waves are amplitude modulated with modulation index m1 and m2, the effective modulation index is

a. Ö m12/m22

b. Ö m1 m2

c. Ö m12+m22-Answer

d. Ö m22/m12

87. If it is transmitted current and Ic is transmitter current at zero modulation index and the transmitted current at modulation index of m will

a. It = Ic Ö[1+m]

b. It = Ic Ö[1+m2]

c. It = Ic Ö[1+m/22]-Answer

d. It = IcÖ1+m2

88. If Rr is the radiation resistance and Rd is the lumped resistance, then the antenna efficiency is given as –

a. (Rr - Rd) / (Rr + Rd)

b. (Rr + Rd) / (Rr – Rd)

c. Rr / (Rr + Rd)-Answer

d. Rd / (Rr + Rd)

89. In end fire array, the current

a. Magnitude and phase in each element is the same

b. Magnitude is the same but phase is different in each element-Answer

c. Magnitude is different but no phase difference in each element

d. Magnitude and phase are different in each element

90. In a board side array, the current

a. Magnitude and phase in each element is the same-Answer

b. Magnitude is the same but phase is different

c. Magnitude is different but no phase difference in each element

d. Magnitude and phase are different in each element

91. Beam width of the 2 metre paraboloid reflector at 6 GHz is

a. 4.5o

b. 9.25o

c. 3.5o-Answer

d. 7.75o

92. The cut of wave length for TE m, n mode is in a wave guide of dimension a*b is

a. 2/Ö(m/a)2 +(n/b)2-Answer

b.2Ö [m/a]2 + [n/b]2

c.Ö(m/a)2 + (n/b)2 /2

d. Ö [m/a]2 + [n/b]2

93. For the standard rectangular waveguide dimension of 4*2 cm the off wavelength for TM11 mode is approximately

a. 1.788cm

b. 3.576cm -Answer

c. 1.682cm

d. 2.546cm

94. In IMPATT diode, the voltage and current are

a. In phase

b. Out off phase by 90o

c. Out off phase by 180o-Answer

d. None of these of the above

95. Which of the following statement is true

a. Tunnel diode & IMPATT diode are negative resistance devices-Answer

b. Tunnel diode is positive resistance device and the IMPATT diode is negative resistance device

c. Tunnel diode is negative resistance device and the IMPATT diode is positive resistance device

d. None of these of the above

96. In a SSB modulation system with 100% modulation index the power saving will be

a. 5/6 of carrier power-Answer

b. 2/8 of carrier power

c. 5/12 of the carrier power

d. ½ of the carrier power

97. In SSB modulation the modulation index is increased from 0.5 to 1.0, then the power will be increased by

a. 2 times

b. 4 times -Answer

c. 16

d. 32 times

98. 900 rpm is equal to

a. 94.2 rad/sec

b. 47.1 rad/sec-Answer

c. 188.4 rad/sec

d. 16.72 rad/sec

99. Darlington pair is used to

a. Increase the voltage gain

b. Increase the current gain-Answer

c. Decrease voltage gain

d. Decrease current gain

100. The transfer function of the system shown is

a. G(s) / {1 + H(s)}

b. G(s) H(s) / {1 + G(s) H(s)}

c. G(s) / {1 + G(s) H(s)}

d. G(s) / G(s) H(s)--Answer

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