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Alternators
| 1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
| 2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
| Q1 ⇒ The rotor preferred for alternators applied
to hydraulic turbines are salient pole type [other wrong options] [Discuss in forum] |
| Q2 ⇒ When a three-phase alternator supplies
capacitive load, armature reaction flux
will be helping the main magnetic field [other wrong options] [Discuss in forum] |
| Q3 ⇒ Which of the following is a prime
mover ? Steam turbine [other wrong options] [Discuss in forum] |
| Q4 ⇒ An alternator is capable of delivering
power at a particular efficiency. The
frequency can be increased by increasing the armature speed [other wrong options] [Discuss in forum] |
| Q5 ⇒ Which fractional pitch will eliminate
the seventh harmonic from the voltage
waveform of an alternator ? 6/7 [other wrong options] [Discuss in forum] |
| Q6 ⇒ In air-crafts, alternators have operating
frequency of 400 Hz [other wrong options] [Discuss in forum] |
| Q7 ⇒ In an alternator short pitch coils are
used to reduce the harmonics in generated e.m.f. [other wrong options] [Discuss in forum] |
| Q8 ⇒ Turbo-rotor is made up of solid steel forging having milled slots for field winding [other wrong options] [Discuss in forum] |
| Q9 ⇒ Unlike D.C. generator kW rating, alternators
are rated in kVA [other wrong options] [Discuss in forum] |
| Q10 ⇒ Overheating of generator's winding reduces life of the machine [other wrong options] [Discuss in forum] |
| Q11 ⇒ In an alternator, the flux created by the
armature m.m.f. subtracts directly
from the main flux for the following
conditions of the load load power factor is zero lagging [other wrong options] [Discuss in forum] |
| Q12 ⇒ In an alternator, when the load power
factor is unity the armature flux will be crossmagnetising [other wrong options] [Discuss in forum] |
| Q13 ⇒ The fictitious part of synchronous reactance
takes care of armature reaction [other wrong options] [Discuss in forum] |
| Q14 ⇒ When two alternators are running in
parallel, their kVAR load share and kW load share are changed by changing
their excitation, driving torque respectively [other wrong options] [Discuss in forum] |
| Q15 ⇒ Salient pole type rotors as compared to
cylindrical pole type are larger in diameter and smaller in axial length [other wrong options] [Discuss in forum] |
| Q16 ⇒ What is the largest size of alternator
being manufactured in India ? 500 MW [other wrong options] [Discuss in forum] |
| Q17 ⇒ The frequency of voltage generated in
large alternators is 50 Hz [other wrong options] [Discuss in forum] |
| Q18 ⇒ What kind of rotor is most suitable for
turbo-alternators which are designed
to run at high speed ? Non-salient pole type [other wrong options] [Discuss in forum] |
| Q19 ⇒ In a large generator, dampers increase stability [other wrong options] [Discuss in forum] |
| Q20 ⇒ In alternators the standard practice,
now a days is to have rotating field [other wrong options] [Discuss in forum] |
| Or |