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Electrical Engineering
Rectifiers And Converters
Quiz 4
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Q.1
To produce cathode spot in a mercury arc rectifier
anode is heated
tube is evacuated
an auxiliary electrode is used
low mercury vapour pressures are used
Q.2
If cathode and anode connections in a mercury arc rectifier are inter changed
The rectifier will not operate
Internal losses will be reduced
Both ion and electron streams will move in the same direction
The rectifier will operate at reduced efficiency
Q.3
Which of the following metals is generally manufactured by electrolysis process?
Load
Aluminium
Copper
Zinc
E. None of the above
Q.4
In a mercury arc rectifier, the anode is usually made of
copper
aluminium
silver
graphite
E. tungsten
Q.5
When a rectifier is loaded which of the following voltage drops take place ?
Voltage drop in transformer reactance
Voltage drop in resistance of transformer and smoothing chokes
Arc voltage drop
All of the above
Q.6
In a mercury pool rectifier, the voltage drop across its electrodes
is directly proportional to load
is inversely proportional to load
varies exponentially with the load current
is almost independent of load current
Q.7
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
Shunt motor
Synchronous motor
Induction regulator
Synchronous generator
Q.8
Which of the following methods may be used to convert A.C. system to D.C.?
Rectifiers
Motor converters
Motor-generator sets
Rotary converters
E. All of the above
Q.9
On which of the following factors the number of phases for which a rectifier should be designed depends?
The voltage regulation of the rectifier should be low
In the output circuit there should be no harmonics
The power factor of the system should be high
All of the above
Q.10
With a motor converter it is possible to obtain D.C. voltage only upto
200-100 V
600-800 V
1000-1200 V
1700-2000 V
Q.11
A commutating rectifier consists of commutator driven by
An induction motor
A synchronous motor
A series motor
A shunt motor
Q.12
The voltage drop at anode, in a mercury arc rectifier is due to
self restoring property of mercury
high ionization potential
energy spent in overcoming the electrostatic field
high temperature inside the rectifier
Q.13
The efficiency of an electrolytic rectifier is nearly
80%
70%
60%
40%
0 h : 0 m : 1 s
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