1. Frequency range at which the land coaxial cables are used, is

106 to 108 Hz

1010 to 1011 Hz

103 to 104 Hz

None of these

2. In a broad sense, a railway track is an example of

simplex

half-duplex

full-duplex

All of these

3. Bit stuffing refers to

inserting a '0' in user stream to differentiate it with a lag

inserting a '0' in lag stream to avoid ambiguity

appending a nibble to the lag sequence

appending a nibble to the use data stream

4. Unmodulated signal coming from a transmitter is known as

carrier signal

baseband signal

primary singal

None of these

5. Method of communication in which transmission takes place in both directions, but only in one direction at a time, is called

simplex

four wire circuit

full duplex

half duplex

6. Thick coax have maximum segment of

500 m

200 m

100 m

700 m

7. Twisted pair have maximum segment of

500 m

200 m

100 m

2000 m

8. Fibre optics have maximum segment

500 m

200 m

100 m

2000 m

9. Modem is used in data trasmission. When was it involved and in which country ?

1963, USA

1965, Germany

1950, USA

1950, Japan

10. Different computers are connected to a LAN by a cable and

modem

interface card

special wires

telephone lines

11. Working of the WAN generally involves

telephone lines

micro waves

satellites

All of these

12. Due to which of the following reasons excessive bond width in control systems should be avoided ?

It leads to slow speed of response

It leads to low relative stability

Noise is proportional to band width

None of the above

13. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?

The system is relatively stable

The system is highly stable

The system is highly oscillatory

None of the above

14. Which of the following statements is correct for any closed loop system ?

All the co-efficients can have zero value

All the co-efficients are always non-zero

Only one of the static error co-efficients has a finite non-zero value

None of the above

15. The second derivative input signals modify which of the following ?

The time constant of the system

Damping of the system

The gain of the system

The time constant and suppress the oscillations

16. The transient response, with feedback system,

rises slowly

rises quickly

decays slowly

decays quickly

17. .On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?

Frequency

Loop gain

Forward gain

All of the above

18. The band width, in a feedback amplifier.

remains unaffected

decreases by the same amount as the gain increase

increases by the sane saaaajajt as the gain decrease

decreases by the same amount as the gain decrease

19. Transfer function of a system is used to calculate which of the following ?

The order of the system

The time constant

The output for any given input

The steady state gain

20. Zero initial condition for a system means

input reference signal is zero

zero stored energy

ne initial movement of moving parts

system is at rest and no energy is stored in any of its components