Feb 2018

ELECTRICIAN THEORY

SEMESTER-I

PART-1

1. The forbidden energy gap

for germanium is ................

a)  0.3eV  .

b)  3.5 eV    

c)  0.72eV    

d)  1.1 eV

ANSWER:- c)  0.72eV    

2. The bandgap of silicon

at room temperature is ........

a)  1.3eV    

b)  0.7eV    

c)  1.1 eV   

d)  1.4eV

ANSWER:- c)  1.1 eV

3. The earth wires are

made of .......
a) Copper
b) Aluminium

c) Iron

d) Galvanized stranded

steel

ANSWER:- c) Iron

4. The rating of fuse is

always expressed in .....

a)Volts

b) Amperes

c) Ampere-volts      

d) Ampere hours

ANSWER:- b) Amperes

5. A fuse is .....

a) Always connected in

series with the circuit

b) Always connected in

parallel with the circuit

c) Normally connected in

series with the circuit

d) Normally connected in

parallel with the circuit

ANSWER:- a) Always

connected in series with the

circuit

6. The size of conductor

used in power cables

depends on .........

a) Operating voltage

b) Power factor

c) Current to be carried

d) Type of insulation used

ANSWER:- c) Current to be

                         carried

7. Ohm's law is applied to ........

a) Semiconductors   

b) Electrolytes

c) Carbon resistors   

d) All of these

ANSWER:- c) Carbon resistors

8. Two wires A and B of the

same material and length

L and 2L have radius R and 2R

respectively. The ratio of their

specific resistance will be .............

a) 1:1     b) l:2     c) 1:4      d) 1:8

ANSWER:- b) l:2

9. Ideal voltage sources

    have .............
a) Zero internal resistance
c) Low value of current

b) Infinite internal resistance
d) Large value of emf

ANSWER:- a) Zero internal resistance

10. Kirchhoff s laws are

      valid for .....
a) Linear circuit only
c) Nonlinear circuits only

b) Passive time invariant circuits
d) Both linear and nonlinear

    circuits

ANSWER:- d) Both linear and

                         nonlinear circuits

11. The unit of impedance is .....

a) Ohms

b) Siemens

c) Mho

d) Henry

ANSWER:- a) Ohms

12. The value of peak factor of a

sinusoidal waveform is .......
a) Zero b) 1 c)1.11 d) 1.41

ANSWER:- d) 1.41

13. The algebraic sum of incoming

current is equal to the sum of

outgoing current statement of .....

a) Kirchoff' s current law

b) Kirchoff' s voltage law

c) Ohm's law

d) Joule's law

ANSWER:- a) Kirchoff' s current law

14. A 12 V battery under fully

charged condition has open

circuit voltage of.....
a) 12V  

b) <12V   

c) >12V   

d) <12V

ANSWER:- d) <12V

15. A 100W, 220 volt lamps takes

a current of-

a) 5/11 A

b)2.2A

c) 0.22 A

d) 5/22 A

ANSWER:- a) 5/11 A

16. The r.m.s. value of sinusoidal

alternating current is given by

the relation .....
a) /2

b) 0.637 

c) 2/ 

d)

ANSWER:-

17. In a pure inductive A.C.

circuit ............

a) Voltage leads the current

     vector by 90°   

b) Voltage legs the current

     vector by 90°
c) Current leads the voltage

    vector by 90°  

d) Current is in phase with the

    voltage vector

ANSWER:- a) Voltage leads the

                   current vector by 90°   

18. Primary battery is such a

       battery ........

a) Which can be recharged

b) Which cannot be reconditioned

     by replacing chemical

c) Which cannot be reused

d) Which cannot be recharged

ANSWER:- d) Which cannot

                          be recharged

19. Internal resistance of a battery

      cell increases with ......

a) Increases in concentration of

     electrolyte

b) Increase in distance between two

     electrodes

c) Increases in area of the plates

     inside the electrolyte

d) Increase in size of the electrodes

ANSWER:- b) Increase in distance

between two  electrodes

20. If cells are connected in series,

      then .......... will increase.

a) Current

b) Voltage

c) Power

d) Energy

ANSWER:- b) Voltage

21. If Z

is the electro - Chemical equivalent

of a substance of the electrolyte.

E is the chemical equivalent of the

same substance, then the relation

 between Z & E will be ......
a) ZE      

b) Z = E     

c) Z < E     

d) Z > E

ANSWER:- a) ZE

22. Negative electrode or anode

of simple voltaic cell is made of....

a) Copper

b) Zinc

c) Lead

d) Carbon

ANSWER:-

23. E.C.E stands for.....

a) Electrovalent chemical equivalent

b) Electrolysis cathode equivalent

c) Electro chemical equivalent

d) None of these

ANSWER:- c) Electro chemical

equivalent

24. Resistivity of metals is expressed

in terms of.....

a)µΩ              

b) µΩ-cm/ °C       

c) µΩ  - cm     

d) Ω

ANSWER:- c) µΩ  - cm

25. Permittivity of free space is

equal to .....

a)  8.84xlO¯¹²F/m

b)  8.84x10¯¹³F /m

c)  8.84.x 10¯¹¹F/m

d)  8.84x 10¯¯¹°F/m

ANSWER:- a)  8.84xlO¯¹²F/m