Which of the following is the loss within the mercury arc rectifier chamber ?
A. Voltage drop in arc
B. Voltage drop at the anode
C. Voltage drop at the cathode
D. All of the above
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Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
A. Mechanical rectifiers
B. Copper oxide rectifiers
C. Selenium rectifiers
D. Electrolytic rectifiers
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The efficiency of an electrolytic rectifier is nearly____________?
A. 80%
B. 70%
C. 60%
D. 40%
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The ignited or auxiliary anode in mercury arc rectifier is made of____________?
A. Graphite
B. Boron carbide
C. Aluminium
D. Copper
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The polarity of the induced voltage can be determined by using the left-hand generator rule
A. Yes
B. No
D. None of these
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Reversing the field or the current will reverse the force on the conductor
A. Yes
B. No
D. None of these
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The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
A. Yes
B. No
D. None of these
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Which circuit element(s) will oppose the change in circuit current ?
A. Resistance only
B. Inductance only
C. Capacitance only
D. Inductance and capacitance
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A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by________________?
A. Variation in coil current
B. Variation in voltage to the coil
C. Change of number of turns of coil
D. The resistance of magnetic path
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A crack in the magnetic path of an inductor will result in________________?
A. Unchanged inductance
B. Increased inductance
C. Zero inductance
D. Reduced inductance
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Word of the Day
13 Sep
Conjecture
an opinion or conclusion formed on the basis of incomplete information.
تکہ مارنا، قیاس کرنا، تاویل

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