1. The advantage of a semiconductor strain gauge over the normal strain gauge is that ?

a) it is more sensitive         b) it is more linear           c) it is less temperature dependent            d) it's cost is low

2. A system is causal if the output of any time depends only on ?

a) Values of input in the past and in the future

b) Values of input at that time and in the past

c) Values of input at that time and in the future

d) None

3. Class A amplifier is used when

a) No phase inversion is required

b) Highest voltage gain is required

c) dc voltages are to be amplified

d) Minimum distortion is desired

4. The amplifiers following the modulated stage in a low level modulation AM system be

a) linear amplifier           b) harmonic generators            c) class C power amplifiers             d) class B untuned  amplifiers

5. A two cavity klystron tube is a ?

a) velocity modulated tube

b) frequency modulated tube

c) Amplitude modulated tube

d) simple triode

6. In a radio receiver the IF amplifier

a) is tuned above the stations incoming frequency

b) amplifies the output of local oscillator

c) is fixed tuned to one particular frequency

d) can be tuned to various isolate frequencies

7. A  DE  MOSFET differs from a JFET in the sense that it has no ?

a) channel            b) gate                c) P-N junctions             d) substrate

8. Consider the following statement for a 2-port network
1. Z11 = Z22                             2. h12 = h21

3. Y12 = -Y21                          4. BC ? AD = -1

then the network is reciprocal if and only if ?

a) 1 and 2 are correct                 b) 2 and 3 are correct             c) 3 and 4 are correct                d) 4 alone is correct

9. For a pulse transformer, the material used for its core and the possible turn ratio from primary to secondary are respectively ?

a) ferrite : 20 : 1            b) laminated iron : 1 : 1             c) ferrite : 1 : 1                 d) powdered iron : 1 : 1

10. In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of bits required is ?

a) 7             b) 8              c) 9              d) 200

11. Amplitude modulation is used for broadcasting because

a) it is move noise immune than other modulation systems

b) compared with other systems it requires less transmitting power

c) its use avoids receiver complexity

d) no other modulation system can provide the necessary bandwidth for high fidelity

12. Which one is a cross field tube ?

a) Klystron                b) Reflex Klystron                c) Magnetron                    d) TWT

13. A iron cored choke is a ?

a) Linear and active device

b) Non linear and passive device

c) Active device only

d) Linear device only

14. Which wave cannot exist inside wave guide ?

a) TE                b) TM                c) TEM                d) HE

15. From the hot metal surface electrons escape because

a) of change of state from metal to gas due to heat.

b) of change of stats from gas to metal.

c) the energy supplied is greater than the work function .

d) the energy is greater than Fermi level.

16. A two port network having a 6 dB loss will give ?

a) an output power which is one ? quarter of the input power

b) an output power which is one ? half of the input power

c) an output voltage which is 0.707 of the input voltage

d) an output power which is 0.707 of the input power

17. The frequency range 30MHz ? 300MHz is ?

a) medium frequency              b) very high frequency               c) super high frequency              d) Infrared  frequency

18. A T type attenuator is designed for an attenuation of 40 dB and terminating resistance of 75 ohms. Which of the following values represent full series and R1 and shunt arm R2 ?

1. R1 = 147W                          2. R1 = 153W

3. R2 = 1.5W                           4. R2 = 3750W

a) 1 and 3            b) 1 and 4             c) 2 and 3                d) 2 and 4

19. Considering the following statement :
      In a magic tee

1. the collinear arms are isolated from each other

2. one of the collinear is isolated from the E-arm

3. one of the collinear  arm is isolated from the H-arm

4. E-arm and H-arm are isolated from each other.

Of  these statements

a) 1 and 2 are correct             b) 1 and 3 are correct            c) 1 and 4 are correct                 d) 2 and 3 are correct

20. A duplexer is used to

a) couple two antennas to a transmitter without interference

b) isolate the antenna from the local oscillator

c) prevent interference between two antennas connected to a receiver

d) use an antenna for reception or transmission without interference

21. Intel's 8085 microprocessor chip contains

a) seven 8 bit registers            b) 8 seven bits registers                  c) seven 7                 d) eight 8