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BEL Placement Papers-Free Download

46. In a monolithic IC, resistors are formed from

a. Ceramic materials

b. Copper

c. P-type semiconductor-Answer

d Aluminium deposition

47. ICs made by sputtering of materials on a ceramic substrate are called

a. Monolithic

b. Hybrid

c. Thick film

d. Thin film--Answer

48. Two coils (inductors) connected in series have a combined inductance of 15mH. When terminals of one of the coils are reversed and connected to the other, the combined inductance is measured to be 9mH. What is the value of mutual inductance

a. 1.5mH -Answer

b.3mH

c.6mH

d.12mH

49. If a parallel LC circuit is excited at frequency less than its resonant frequency, the nature of its effective impedance is

a. Resistive

b. Inductive -Answer

c. Capacitive

d. None of these of these

50. The wave length of 1 Giga hertz frequency signal is

a. 10cm

b. 30cm -Answer

c. 3cm

d. 1cm

51. Which of the following microwave tubes can be considered as broad band devices

a. Magnetrons

b. Klystrons

c. Reflex klystrons

d. Traveling wave tubes[TWT]-Answer

52. Which family of the following integrated circuits has the highest speed

a. DTL

b. ECL -Answer

c. TTL

d.CMOS

53. The most important feature of CMOS family of ICs is

a. High speed

b. Small size

c. Low power consumption-Answer

d. Low input impedance

54. What is the resolution of 8 bit A/D converter if its full scale voltage is 10v

a. 0.02v

b. 0.01

c. 0.039v -Answer

d. 0.078v

55. What value of resistance is to be used in LSB of 4 bit weighted ladder D/A converter if MSB has 10 kW resistor

a. 160k

b. 80k -Answer

c. 240k

d. 100k

56. The pulse width of a radar transmitter is 0.6m sec. and the pulse repetition rate is 700 Hz. The average power measured is 420 watts. What is the peak power

a. 100KW

b. 420KW

c. 1MW -Answer

d. None of these

57. The device used for isolating the transmitter and receiver in a radar system is called

a. Diplexer

b. Duplexer-Answer

c. Directional coupler

d. None of these

58. “Baud” is

a. Total No. of bits/sec in each character

b. Reciprocal of shortest signal element in a character-Answer

c. Duration of a character in data transmission

d. None of these

59. The advantage of Totem pole output stage in TTL ICs is

a. Low output impedance-Answer

b. Can sink more current

c. Oscillations avoided

d. None of these

60. The capacitance value of a varactor is controlled by

a. A reverse voltage applied to it-Answer

b. A series resistance

c. Varying its supply voltage

d. Current through the device

61. Electron volt is equivalent to

a. 3.8 * 10-20 erg

b. 1.602 * 10-12 erg-Answer

c. 1.602 * 10-18 erg

d. 1.602 * 10-16 erg

62. The kinetic energy of photo electrons emitted by a photo sensitive surface depends on

a. Intensity of the incident radiation

b. Wavelength of the incident radiation-Answer

c.Angle of incident of radiation

d. Surface conditions of the surface

63. Flux is expressed in radio-metric system in

a. Lumens-Answer

b. Photons

c. Watts

d. Candles

64. In a three-phase bridge rectifier circuit, the ripple frequency is

a. Same as line frequency

b. Twice the line frequency-Answer

c. Thrice the line frequency

d. Six times the line frequency

65. Energy stored in a capacitor as a function of voltage is given by

a. CV2

b. 1V2/2C

c. ½ CV2-Answer

d. 1V/2C

66. The operational amplifier used in analog computers have usually open loop flat gain approximately upto

a. 1MHz

b. 100MHz

c. 10MHz

d. 0.1MHz-Answer

67. An oscillator of 350 MHz is fed with a pulse of rise time 2 n sec. The rise time of the displayed waveform is approximately

a. 1 n sec

b. 2.2 n sec

c. 2.0 n sec -Answer

d. 1.7 n sec

68. A radar transmits a peak power of 100 KW with pulse width of 1 m sec and a pulse repetition rate of 100 KHz. The average output power of the radar is

a. 100KW

b.10KW -Answer

c. 1000KW

d. 50KW

69. The incremental inductance in a coil is due to

a. Saturation

b. Superimposed DC

c. Mutual inductance

d. Change of frequency-Answer

70. Microwave tube based on velocity modulation principle is

a. Klystron-Answer

b.Magnetron

c. Light house tube

d. Traveling wave tube

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