BSNL Test Paper :9

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Test Paper :9
 Paper Type     : Whole Testpaper  Test Location  : BSNL JTO Exam 2005 - 5 Posted By        : Admin  

 

BSNL GE-JTO Recruitment Examination 

 Test Paper - V

Reactive current through the capacitive load produces -

a) Magnetic field

b) Electric field

c) Supermagnetic field

d) None 

 

One of the following which gives piero-electric effect is -

a) Mu metal

b) PVDF

c) Sapphire

d) Ferrites 

 

 PZT piezo- electric materials have -

a) Higher curie temperature

b) Lower curie temperature

c) Absolute temperature

d) None 

 

The residual resistivity of a binary alloy at OK is -

a) The sum of the residual resistivities of the component metals

b) The difference of the residual resistivities of the component metals.

c) The product of the residual resistivities of the component metals

d) Dependent on the concentration of the minor component in the alloy 

 

 In active filter circuits, inductances are avoided mainly because they -

a) Are always associated with some resistance

b) Are bulky and unsuitable for miniaturisation

c) Are non-linear in nature

d) Saturate quickly  

 The depletion layer across a p-n junction lies -

a) mostly in the p-region

b) mostly in the n-region

c) equally to both p and n region

d) entirely in the p-region 

 

The voltage induced in a loop of wire rotating in a strong and steady magnetic field is -

a) pulsating dc

b) dc

c) rectified ac

d) ac  

One of the following types of capacitor which is polarized is -

a) Electrolytic

b) Ceramic

c) Paper

d) Mylar  

Electric shock is-

a) Always fatal

b) Never fatal

c) Sometimes fatal

d) Always disfiguring 

 

A typical value of filter capacitor for 50 Hz ripple is -

a) 16mF

b) 10F

c) 10mF

d) None  

A telephone relay armature is made of material with -

a) High electrical conductivity

b) Low electrical conductivity

c) Negligible conductivity

d) None  

 

 Larger the value of filter capacitor -

a) Larger is the peak-peak value of ripple voltage

b) Larger is the peak current in the rectifying diode

c) Longer is the time that current pulse flows through the diode

d) Smaller is the dc voltage across the load 

 

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 

 

The polarity of VGS for E-only MOSFET is -

a) positive

b) negative

c) zero

d) depends on P or N channel  

The following which will serve as a donor impurity in silicon -

a) Boron

b) Indium

c) Germanium

d) Antimony  

When bias applied to a vari-cap diode is increased, its capacitance -

a) is decreased

b) is increased

c) remains constant

d) first increases and then decreases. 

 

In case of a bipolar transistor a is -

a) positive and greater than 1

b) positive and less than 1

c) negative and greater than 1

d) negative and less than 1  

A BJT is -

a) not very sensitive to radiations

b) very sensitive to radiations.

c) independent of radiations

d) none  

An SCR may be considered to be -

a) 2 diodes

b) 3 diodes

c) 4 diodes

d) 5 diodes  

For a BJT, under the saturation condition -

a) IC = bIB

b) IC > bIB

c)  IC is independent of all other parameters

d) IC < bIB  

 In modern MOSFET