Related Questions

For the same secondary voltage, the output voltage from a centre-tap rectifier is ___________ than that of bridge rectifier
A twice
B thrice
C four time
D one-half
The PIV rating of each diode in a bridge rectifier is ___________ that of the equivalent centre-tap rectifier
A one-half
B the same as
C twice
D four times
The efficiency of an electrolytic rectifier is nearly
A 80%
B 70%
C 60%
D 40%
The efficiency of the copper oxide rectifier seldom exceeds
A 90 to 95%
B 85 to 90%
C 80 to 85%
D 65 to 75%
The internal efficiency of a mercury arc rectifier depends on
A voltage only
B current only
C voltage and current
D r.m.s. value of current
E none of the above
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%
In a glass bulb mercury arc rectifier the maximum current rating is restricted to
A 2000 A
B 1500 A
C 1000 A
D 500 A
When a crystal diode is used as a rectifier, the most important consideration is ___________
A forward characteristic
B doping level
C reverse characteristic
D PIC rating
The ripple factor of a half-wave rectifier is ___________
A 2
B 1.21
C 2.5
D 0.48

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