Communication Skill MCQs and Notes

M

Mr. Dubey • 51.17K Points
Coach

Q 41. To eliminate ghosts in the picture

(A) use a longer transmission line

(B) connect a booster

(C) change the antenna orientation of location

(D) twist the transmission line

M

Mr. Dubey • 51.17K Points
Coach

Q 42. In Modulation, “carrier” is

(A) resultant wave

(B) speech voltage to be transmitted

(C) voltage with constant frequency, phase or amplitude

(D) voltage for which frequency, phase or amplitude is varied

M

Mr. Dubey • 51.17K Points
Coach

Q 43. Which of the following statements is correct?

(A) convex lens has positive focal power and concave lens have negative focal power

(B) convex lens has negative focal power and concave lens have positive focal power

(C) all lens have positive focal power

(D) all lens have negative focal power

M

Mr. Dubey • 51.17K Points
Coach

Q 44. In Pulse Code Modulation system

(A) large bandwidth is required

(B) quantising noise can be overcome by companding

(C) quantising noise can be reduced by decreasing the number of standard levels

(D) suffers from the disadvantage of its incompatibly with tdm

M

Mr. Dubey • 51.17K Points
Coach

Q 45. The colour of an object is decided by

(A) the reflected colour

(B) the wavelength transmitted through it

(C) reflected colour for opaque object and wavelength transmitted through it for transparent objects

(D) none of the above

M

Mr. Dubey • 51.17K Points
Coach

Q 46. Commercial Frequency deviation of FM is

(A) 70 khz

(B) 75 khz

(C) 80 khz

(D) 65 khz

M

Mr. Dubey • 51.17K Points
Coach

Q 47. For telegraphy the most commonly used modulation system is

(A) fsk

(B) two tone modulation

(C) pcm

(D) single tone modulation

M

Mr. Dubey • 51.17K Points
Coach

Q 48. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

(A) 102.3

(B) 113

(C) 70.2

(D) 80.9

M

Mr. Dubey • 51.17K Points
Coach

Q 49. Circular polarization

(A) is useful in reducing depolarization effect on received wave

(B) involves critical alignment of transmitting and receiving antenna

(C) is useful in discrimination between reception of adjacent beams

(D) none of the above

M

Mr. Dubey • 51.17K Points
Coach

Q 50. When the length of antenna is a whole wavelength

(A) the radiation at right angles is zero

(B) the radiation at right angles is maximum

(C) the radiation is zero in all directions

(D) the radiation is maximum in all directions

Communication Skill

Q 41. To eliminate ghosts in the picture

Q 42. In Modulation, “carrier” is

Q 43. Which of the following statements is correct?

Q 44. In Pulse Code Modulation system

Q 45. The colour of an object is decided by

Q 46. Commercial Frequency deviation of FM is

Q 47. For telegraphy the most commonly used modulation system is

Q 48. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

Q 49. Circular polarization

Q 50. When the length of antenna is a whole wavelength

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