Electrical Engineering · Question Bank

Converters & Rectifiers

30 of 59 questions match · page 1 of 2. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 36Problem solving 6Objective 30
DifficultyAll 30Easy 30MediumHard
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#1📜 EE Board April 1994📘 1001 RojasEasy
In a three-phase synchronous converter, the ratio of the AC voltage to DC voltage is
A0.612
B1
C0.5
D0.707
#2📜 EE Pre-Board August 2014📘 PowerhouseEasy
In a half-wave rectifier, if ac supply is 60 Hz, the ac ripple is__________.
A120 Hz
B60 Hz
C30 Hz
D15 Hz
#3📜 EE Pre-Board August 2015📘 PowerhouseEasy
If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
A30 Hz
B60 Hz
C120 Hz
D240 Hz
#4📜 EE Pre-Board August 2017📘 PowerhouseEasy
If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
A30 Hz
B60 Hz
C120 Hz
D240 Hz
#5📜 EE Pre-Board August 2018📘 PowerhouseEasy
An ideal full-wave rectifier with non-inductive load has zero transformation losses. What is the efficiency?
A70%
B80%
C90%
D100%
#6📘 EE Pocket Reviewer RojasEasy
What is a thyratron?
AIt is vacuum tube with four electrodes
BIt is a gas-filled triode
CIt is a gas-filled diode
DNone of these
#7📘 EE Pocket Reviewer RojasEasy
A rotary converter operates at what power factor?
ALow power factor
BHigh power factor
CZero power factor
DEither A or
#8📘 EE Pocket Reviewer RojasEasy
If one of the diode in a bridge full wave rectifier opens, what is the output voltage waveform?
ANo output voltage
BA half wave rectified voltage
COne-fourth the amplitude of the input voltage
DThree-fourth the amplitude of the input voltage
#9📘 EE Pocket Reviewer RojasEasy
In mercury arc rectifiers, the characteristic blue luminosity is due to which one?
AIonization
BColor of mercury
CHigh temperature
DElectron streams
#10📘 EE Pocket Reviewer RojasEasy
Which of the following is a loss within the mercury arc rectifier chamber?
AVoltage drop at the anode
BVoltage drop at the cathode
CVoltage drop at the arc
DAll of these
#11📘 EE Pocket Reviewer RojasEasy
For the same size, the \(I^2R\) loss of a rotary converter is ____ that of a dc generator.
AMore than
BLess than
CEqual
DDouble
#12📘 EE Pocket Reviewer RojasEasy
When a 60 Hz sinusoidal voltage is applied to the input of a half wave rectifier, the output frequency is how much?
A120 Hz
B30 Hz
C60 Hz
D0 Hz
#13📘 EE Pocket Reviewer RojasEasy
In a mercury arc rectifier what will happen if the cathode and anode are interchanged?
AThe rectifier will not operate
BInternal losses will be free
CThe rectifier will operate at reduced efficiency
DBoth ion and electron streams will move in the same direction
#14📘 EE Pocket Reviewer RojasEasy
Which of the following can start a rotary converter?
AFrom the dc side as a dc motor
BFrom the ac side as an induction motor
CBy means of a small auxiliary motor
DAny of these
#15📘 EE Pocket Reviewer RojasEasy
In mercury arc rectifiers, which of the following flows from anode to cathode?
AIons
BElectrons
CHole
DBoth electrons and ions
#16📘 EE Pocket Reviewer RojasEasy
Which one is true about a rectifier?
AIt is a bilateral device
BIt is a linear device
CIt is a non-linear device
DIt is a passive device
#17📘 EE Pocket Reviewer RojasEasy
Which of the following equipment needs DC currents? 1
ARelays
BTelephones
CTime switches
DAll of these
#18📘 EE Pocket Reviewer RojasEasy
A synchronous converter combines the function of which of the following?
AA synchronous motor and a dc generator
BA dc series motor and a dc generator
CA dc shunt motor and a synchronous generator
DAn induction motor and a dc generator
#19📘 EE Pocket Reviewer RojasEasy
In arc rectifiers, mercury is chosen as the liquid for rectifiers. Why? 1
AIt has low specific heat
BIt has low ionization potential
CIt has high atomic weight
DAll of these
#20📘 EE Pocket Reviewer RojasEasy
Which of the following rectifiers can withstand maximum voltage on the dc side?
AMercury arc rectifiers
BGlass bulb rectifiers
CSteel tank rectifiers
DDiode rectifiers

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