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Home⇒ Engineering⇒
Rectifiers and converters
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. |
Q21 ⇒ Which of the following A.C. motors is
usually used in large motor-generator
sets ? Synchronous motor [other wrong options] [Discuss in forum] Squirrel cage induction motor Slip ring induction motor Any of the above |
Q22 ⇒ Glass rectifiers are usually made into
units capable of D.C. output (maximum
continuous rating) of 500 A at 500 V [other wrong options] [Discuss in forum] 100 A at 100 V 200 A at 200 V 300 A at 300 V 400 A at 400 V |
Q23 ⇒ In a mercury arc rectifier characteristic
blue luminosity is due to ionization [other wrong options] [Discuss in forum] colour of mercury high temperature electron streams |
Q24 ⇒ In a grid control of mercury arc rectifiers
when the gTid is made positiye
relative to cathode, then it____ the
electrons on their may to anode. accelerates [other wrong options] [Discuss in forum] decelerates any of the above none of the above |
Q25 ⇒ In selenium rectifiers efficiencies ranging
from ____ to ____ percent are attainable 75, 85 [other wrong options] [Discuss in forum] 25, 35 40, 50 60, 70 |
Q26 ⇒ In a mercury arc rectifier, the anode is
usually made of graphite [other wrong options] [Discuss in forum] copper aluminium silver tungsten |
Q27 ⇒ A rotary converter combines the function
of a synchronous motor and a D.C. generator. [other wrong options] [Discuss in forum] an induction motor and a D.C. generator a D.C. series motor and a D.C. generator none of the above |
Q28 ⇒ In a rotary converter armature currents
are partly a.c. and partly d.c. [other wrong options] [Discuss in forum] d.c. only a.c. only |
Q29 ⇒ The voltage drop at anode, in a mercury
arc rectifier is due to energy spent in overcoming the electrostatic field [other wrong options] [Discuss in forum] self restoring property of mercury high ionization potential high temperature inside the rectifier |
Q30 ⇒ Which of the following mercury arc rectifier
will deliver least undulating current
? Six-phase [other wrong options] [Discuss in forum] Three-phase Two-phase Single-phase |
Q31 ⇒ In mercury arc rectifiers having grid,
the arc can b struck between anode
and cathode only when the grid attains
a certain potential, this potential being
known as____ critical grid voltage [other wrong options] [Discuss in forum] maximum grid voltage any of the above none of the above |
Q32 ⇒ Ageing of a selenium rectifier may
change the output voltage by 5 to 10 per cent [other wrong options] [Discuss in forum] 15 to 20 per cent 25 to 30 per cent none of the above |
Q33 ⇒ The ignited or auxiliary anode in mercury
arc rectifier is made of boron carbide [other wrong options] [Discuss in forum] graphite aluminium copper |
Q34 ⇒ Which of the following is reversible in
action ? Rotary converter [other wrong options] [Discuss in forum] Motor generator set Motor converter Any of the above None of the above |
Q35 ⇒ In which of the following equipment
direct current is needed ? All of the above [other wrong options] [Discuss in forum] Telephones Relays Time switches |
Q36 ⇒ The internal efficiency of a mercury arc
rectifier depends on voltage only [other wrong options] [Discuss in forum] current only voltage and current r.m.s. value of current none of the above |
Q37 ⇒ In a glass bulb mercury arc rectifier the
maximum current rating is restricted
to 500 A [other wrong options] [Discuss in forum] 2000 A 1500 A 1000 A |
Q38 ⇒ In phase-shift control method the control
is carried out by varying the of
grid voltage. phase [other wrong options] [Discuss in forum] magnitude polarity any of the atove none of the above |
Q39 ⇒ The applications of selenium rectifiers
are usually limited to potential of 100 V [other wrong options] [Discuss in forum] 10 V 30 V 60 V 200 V |
Q40 ⇒ Which of the following metals is
generally manufactured by electrolysis
process ? Aluminium [other wrong options] [Discuss in forum] Load Copper Zinc None of the above |
Or |