1. In the case of an instrument reading of 8.3V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is ?

a) 1.810%                 b) 0.181%                  c) 18.10%                   d) 0.0018%

2. When a short grounded vertical antenna has a length L which is 0.05 l at frequency f and if it?s radiation resistances at f is R Ohms, then it?s radiation resistance at a frequency 2f will be ?

a) R/2 ohms                   b) R ohms                c) 2R ohms                d) 4R ohms

3. Gold is often diffused into silicon DN junction devices to ?

a) increase the recombination rate

b) reduce the recombination rate

c) make silicon a direct gap semiconductor

d) make silicon semi-metal

4. For an insulating material, dielectric strength and dielectric loss should be respectively ?

a) high and high                 b) low and high                 c) high and low              d) low and low

5. A high Q coil has ?

a) large band width              b) high losses               c) low losses                  d) flat response

6. A single phase full wave midpoint thyristor converter uses a 230/200V transformer with centre tap on the secondary side. The P.I.V per thyristor is ?

a) 100V                 b) 141.4V               c) 200V                d) 282.8V

7. Registers in which data is entered or taken out in serial form are referred as ?

a) left shift register                   b) right shift register                c) shift registers                  d) none of the above

8. On differentiation unit impulse function results in --

a) Unit parabolic function              b) Unit triplet               c) Unit doublet                  d) Unit ramp function

9. --- watt of power is received from sun per m2 surface area  of a  geosynchronous  satellite

a) 100              b) 500                c) 2000                  d) 1000

10. In a radar system maximum unambiguous range depends on

a) maximum power of the transmitter

b) pulse repetition frequency

c) width of the transmitted pulse

d) sensitivity of the radar receiver

11. Ionosphere layer of earth is situated at ?

a) upto 18kms from earth               b) from 18 to 70 km                c) 70 to 500 km                 d) above 500 km

12. The thermal noise depends on ?

a) direct current through device

b) resistive component of  resistance

c) reactive component of impedance

d) load to connected

13. When A = 0, B = 0, C = 1 then in 2 input logic gate we get - - gate

a) XOR                b) AND              c) NAND                 d) NOR

14. The ripple factor in an LC filter

a) Increases with the load current

b) Increases with the load resistance

c) Remains constant with the load current

d) Has the lowest value

15. An ideal power supply consist of ?

a). Very small output resistance

b). Zero internal resistance

c). Very large input resistance

d). Very large output resistance