Electrical Engineering Mcqs

Multiple inlet system of air cooling of turbo-alternators can be used for machines of rating upto_______________?

(A) 10 MW
(B) 30 MW
(C) 60 MW
(D) 150 MW

Submitted By :Ali Uppal

On which of the following variables heat convected depends ?

(A) Power density
(B) Temperature difference between heated surface and coolant
(C) Thermal resistivity, density, specific heat
(D) Gravitational constant
(E) All of the above

Submitted By :Ali Uppal

Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?

(A) Copper
(B) Aluminium
(C) Steel
(D) Cast-iron

Submitted By :Ali Uppal

The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?

(A) conduction
(B) convection
(C) radiation
(D) any of the above

Submitted By :Ali Uppal

__________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?

(A) Grey cast-iron
(B) Cast steel
(C) High carbon steel
(D) Stainless steel

Submitted By :Ali Uppal

Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?

(A) small size
(B) medium size
(C) large size
(D) any of the above size

Submitted By :Ali Uppal

Hot rolled sheets have ___________ value of permeability?

(A) zero
(B) low
(C) high
(D) none of the above

Submitted By :Ali Uppal

Materials exhibiting zero value of resistivity are known as ____________ ?

(A) conductors
(B) semiconductors
(C) insulators
(D) superconductors

Submitted By :Ali Uppal

In direct cooled system using hydrogen both stator and rotor conductors are made____________?

(A) solid
(B) hollow
(C) perforated
(D) any ofthe above

Submitted By :Ali Uppal

The resistivity of water should not be less than_____________?

(A) 10 Q m
(B) 100 Q m
(C) 1000 Q m
(D) 2000 Q m

Submitted By :Ali Uppal

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