1. Weins bridge is used for measurement of frequency in the applied voltage waveform is measurement of frequency in the applied voltage waveform is ?

a) sinusoidal                b) square                   c) rectangular                       d) triangular

2. The 'h' parameter equivalent circuit of a junction transistor is valid for ?

a) High frequency, large signal operation

b) High frequency, small signal operation

c) Low frequency, small signal operation

d) Low frequency, large signal operation

3. It is an unidirectional device that blocks the current flow from cathode to anode ?

a) SCR                 b) PCR                c) VCR                   d) DCR

4. In dc choppers for chopping period T, the output voltage can be controlled by FM by varying ?

a) T keeping Ton constant

b) Ton keeping T constant

c) Toff keeping T constant

d) None of the above

5. As the thermal noise get doubled due to the increase in a resistance the noise power get ?

a) doubled                   b) quadrupted                 c) unchanged                    d) halved

6. Malaria affects

a) Liver                 b) Spleen                c) Intestine                  d) Lungs

7. Electrical contact materials used in switches, brushes and relays must possess ?

a) high thermal conductivity and high melting point

b) Low thermal conductivity and low melting point

c) High thermal conductivity and low melting point.

d) Low thermal conductivity and high melting point.

8. In a distortion factor meter, the filter at the front end is used to suppress ?

a) odd harmonics                 b) even harmonics                c) fundamental component                      d) dc component

9. Barrier potential in a P-N junction is caused by ?

a) thermally generated electrons and holes

b) diffusion of majority carriers across the junction

c) migration of minority carriers across the junction

d) flow of drift current

10. With n nodes and b branches a network will have ?

a) (b + n) links               b) b ? n + 1 links               c) b ? n ? 1 links                d) b + n + 1 links

11. A converter which can operate in both 3 pulse and 6 pulse modes is a ?

a) 1 phase full converter

b) 3 phase half wave converter

c) 3 phase semi converter

d) 3 phase full converter

12. In a full wave rectifier the negative point in a circuit is

a) Either cathode

b) Either anode

c) The central tap on the high voltage secondary

d) Either plate

13. The correct sequence of steps required to improve system stability is ?

a) Insert derivative action, use negative feedback, reduce gain

b) Reduce gain, use negative feedback, insert derivative action

c) Reduce gain, insert derivative action, use negative feedback

d) Use negative feedback, reduce gain, insert derivative action

14. In 1965 first geostationary satellite was launched called -

a) ANIK                  b) EARLY BIRD (Intel sat -1)                   c) WESTAR                   d) MOLNIYA

15. In different parts of the country identical telephone numbers are distinguished by their ?

a) Language digits                  b) Access digits                  c) Area codes                      d) Central office codes