1. A telephone receiver uses a permanent magnet in order to:
(A) None
(B) Avoid second harmonic distortion
(C) Give a large bandwidth
(D) Be more sensitive
2. In telephony, at the transmitter side sound energy is converted into:
(A) Mechanical energy
(B) None
(C) Both a & b
(D) Electrical energy
3. In telephony, at the receiver side electrical energy is converted into:
(A) None
(B) Mechanical energy
(C) Both a & b
(D) Sound energy
4. The instrument that consists of a transmitter & a receiver is called:
(A) None
(B) Cradle
(C) Ringer
(D) Handset
5. Receiver does the function of transmitter:
(A) Same
(B) Direct
(C) Reverse
(D) None
6. When the side tone is completely absent, the telephone appears as:
(A) Normal
(B) Dead
(C) Both a & b
(D) None
7. It is an impulse sending device:
(A) Transmitter
(B) Receiver
(C) Dial
(D) None
8. In a telephone receiver, a permanent magnet is:
(A) None
(B) Optional
(C) Not Incorporated
(D) Desirable
9. When a telephone handset is removed from its rest position, the subscriber’s line loop is:
(A) Both a & b
(B) Disconnected
(C) Closed
(D) None
10. The first automatic telephone system was introduced by:
(A) Marconi
(B) Graham Bell
(C) None
(D) Almon B. Strowger
11. Almon B Strowger introduced the exchange:
(A) Manual
(B) Digital
(C) Automatic
(D) None
12. The moving contacts of the selector are called:
(A) None
(B) Wings
(C) Contacts
(D) Wipers
13. The unit of telephone traffic is called:
(A) Erlang
(B) Call/sec
(C) Hours
(D) None
14. In the NWD system different cities are connected together by microwave links, the microwaves used are in the range of:
(A) 4 MHz
(B) 4 GHz
(C) 4 kHz
(D) None
15. A subscriber is connected to an NWD network by dialing the digit:
(A) 1
(B) 0
(C) 9
(D) None
16. The gateway exchange is an international:
(A) Direct exchange
(B) Transit exchange
(C) Local exchange
(D) None
17. The wiper assembly in the uni-selector switch moves only in:
(A) Three directions
(B) Two directions
(C) One direction
(D) None
18. The wiper assembly in the Two Motion selector switch moves in:
(A) One direction
(B) Three directions
(C) Two directions
(D) None
19. A large number of telephone lines are interconnected with each other through the:
(A) None
(B) Telephone set
(C) Both a & b
(D) Telephone exchange
20. Telephone Receiver is basically a:
(A) Transducer
(B) Oscillator
(C) Rectifier
(D) Amplifier
21. Tone dialing produces:
(A) 1 Frequency
(B) 3 Frequencies
(C) 2 Frequencies
(D) 4 Frequencies
22. The unit of telephone traffic is:
(A) Baud
(B) Ohm
(C) Farad
(D) Erlang