87.

88.

89.

90.

91.

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93.

94.

The telephone is invented by :
(ಯ) Alexander Graham Bell (B) Samuel Morse
(C) Charles Babbage (D) Marconi

The term ISDN stands for :
(ಡಿ) Integrated Services Data Network
(B) Information Services Digital Network
(C) Integrated Signals for Digital Network
(D) Integrated Services Digital Network

The grade of service (GOS) of a telecom network is defined as the ratio of :

(ക Lost traffic to Offered Traffic (B) Offered traffic to Lost Traffic

(C) Lost traffic to Carried Traffic (D) Carried traffic to Lost Traffic
The traffic intensity of telecom networks are measured in the unit of :

ക Kilo bits ' X (2) Kilo bits per second

(C) Kilo Hertz (D) Erlangs

The Call Completion Rate (CCR) of a telecom switching network is defined as the ratio of
number of successful calls to number of call attempts. The networks are usually designed to
provide an overall CCR of :

@ 0.50 ⊽ © 0.60

© o070 . (D) 0.80
The telegraph services in India was opened to public in the year :

(&) 1850 (B) 1855

(C) 1950 യ 1955
The power conception of a teleprinter motor is :

ல 20% (8) 80W
(0) 7 D) 800W

The maintenance of routine of teleprinter machines is normally carried out after the
machines have run for about : .

(5) 100 hours or every week whichever is earlier

(B) 200 hours or every fortnight whichever is earlier
(C) 300 hours or every 10001 whichever is earlier
(D) 400 hours or every six weeks whichever is earlier

13 102/2015
[P.T.0.]