51.

52.

58.

54,

55.

56.

57.

58.

59.

60.

The input voltage, current and power 0 8 balanced 3-phase system is measured as 415 V,
16.4 A and 6 kW respectively. The power factor of the system is approximately :

@ 1 B) 8
© 0.9 (0) 05
This among the following is not a renewable source of energy :
(മ Hydro-power (3) Solar energy
{C) Biomass energy (D) Geothermal energy
A fuel cell, in order to produce electricity, burns :
{A) Carbon {B) Hydrogen
{C) Nitrogen (D) Helium
The most nuclear fuel used in the world 15 :
(മ Thorium-232 {B) Uranium-238
(0) Uranium-285 (D) Plutonium-23%
If the supply frequency to the transformer is increased, the iron loss will :
(മ Not change {B) Decreases
(0) Increase {D) Any of the above
The transformer ratings are usually expressed in :
(മ Volts 0) Amperes
டண்‌ D) kVA
Buchholz’s relay gives warning and protection against :
(മ Fault inside transformer {B) Fault outside transformer
{C) For both outside and inside (2) None of the above
The ratio of starting torque to full load torque is least in :
(4) Shunt motor (B) Series motor
(© Differential compound motor യു Cumulative compound motor

Salient poles alternators are generally used on :
(¢) Low speed prime movers only
(® High speed prime movers only
(0 Medium speed prime movers only
(2) Low and medium speed prime movers

The main disadvantage of using short-pitch winding in alternators is that it :
(മ Reduces harmonics in the generated voltage
{B) Reduces the total voltage around the armature coils
{C) Produces asymmetry in the three phase windings
(2) Increases Cu of end connections

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