1) AC power in a load can be controlled by using
a. two SCR’s in parallel opposition
b. two SCR’s in series
c. three SCR’s in series
d. four SCR’s in series
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Answer
Explanation
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ANSWER: two SCR’s in parallel opposition
Explanation:
No explanation is available for this question!
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2) An SCR is made up of silicon because
a. silicon has large leakage current than germanium
b. silicon has small leakage current than germanium
c. silicon has small leakage voltage than germanium
d. silicon has large leakage voltage than germanium
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Answer
Explanation
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ANSWER: silicon has small leakage current than germanium
Explanation:
No explanation is available for this question!
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3) A crowbar is a circuit which is used to protect a
a. voltage sensitive load from excessive dc power supply output voltages
b. current sensitive load from excessive dc power supply output voltages
c. voltage sensitive load from excessive ac power supply output voltages
d. current sensitive load from excessive ac power supply output voltages
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Answer
Explanation
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ANSWER: voltage sensitive load from excessive dc power supply output voltages
Explanation:
No explanation is available for this question!
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4) An SCR can be used
a. as static conductor
b. for power control
c. for speed control of dc shunt motor
d. all of these
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Answer
Explanation
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ANSWER: all of these
Explanation:
No explanation is available for this question!
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5) The curve between V and I of SCR when anode is positive w.r.t cathode and when anode is negative w.r.t cathode are known as
a. both as forward characteristics
b. both as reverse characteristics
c. former as forward characteristics and later as reverse characteristics
d. former as reverse characteristics and later as forward characteristics
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Answer
Explanation
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ANSWER: former as forward characteristics and later as reverse characteristics
Explanation:
No explanation is available for this question!
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6) With gate open, the maximum anode current at which SCR is turned off from ON condition is called
a. breakdown voltage
b. peak reverse voltage
c. holding current
d. latching current
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Answer
Explanation
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ANSWER: holding current
Explanation:
No explanation is available for this question!
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7) In a full wave rectifier, the rectification ratio is approximately equal to
a. 61%
b. 71%
c. 81%
d. 91%
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Answer
Explanation
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ANSWER: 81%
Explanation:
No explanation is available for this question!
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8) In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is
a. V m
b. 2 V m
c. V m / 2
d. 4 V m
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Answer
Explanation
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ANSWER: 2 V m
Explanation:
No explanation is available for this question!
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9) A single phase ac - dc converter is also known as
a. rectifier
b. inverter
c. chopper
d. regulator
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Answer
Explanation
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ANSWER: rectifier
Explanation:
No explanation is available for this question!
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10) If the gate voltage of an SCR is removed, then the
a. anode current decreases
b. anode current does not decrease at all
c. anode current increases
d. cathode current increases
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Answer
Explanation
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ANSWER: anode current does not decrease at all
Explanation:
No explanation is available for this question!
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