Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-6
76. An arc across the switch opening an R-L circuit is a result is a result of the
a) Long time constant
b) Large self-induced voltage across the inductance
c) Source of the voltage caused by IR drop across the resistance
d) Low resistance of the open switch
Ans: (b)
a) Voltage across the inductor leads the voltage across the reactance by 90°
b) Resistance branch current is 90° out of phase with the inductive branch current
c) Resistive and inductive branch current are 180° out of phase
d) Inductive and resistive branch currents are in phase
Ans: (b)
a) Can produce the induced voltage as the current decreases when the switch is opened
b) Cannot produce the induced voltage as the voltage applied has the one polarity
c) Produces more induced voltage when the switch is closed than the switch is opened
d) None of the above
Ans: (a)
a) Maximum value
b) Maximum change in magnetic field
c) Minimum change in magnetic field
d) 0.707 × Peak
Ans: (b)
a) 60 mh
b) 300 mh
c) 150 mh
d) 600 mh
Ans: (d)
a) Iron core has maximum eddy-current losses
b) Laminated iron core has minimum eddy-current losses
c) Power-iron core has the maximum eddy-current losses
d) Air core has the minimum eddy-current
Ans: (d)
a) 0°
b) 180°
c) 360°
d) 90°
Ans: (d)
a) Ceramic capacitors must be connected in the correct polarity
b) Electrolytic capacitor must be connected in the correct polarity
c) Mica capacitors are available in capacitance value of 1 to 10 micro-farad
d) Air capacitors have a blackband to indicate the outside foil
Ans: (b)
a) 33.333
b) 50
c) 1000
d) 100
Ans: (d)
a) Of high peak value
b) Charging current can flow
c) Discharge current can flow
d) Varying voltage produces the charging and discharging currents
Ans: (d)
a) Decreases
b) Increases
c) Remains same for frequencies
d) Decreases as the voltage increases
Ans: (a)
a) Depends on the current rating of the battery
b) Is greater for larger values of capacitances
c) Is smaller for larger values of capacitances
d) Is zero for any value of capacitance
Ans: (d)
a) Voltages across R and Xc are in phase
b) Voltages across R and Xc are 180° out of phase
c) Voltages across R leads the voltages across Xc by 90°
d) Voltage across R lags the voltage across Xc by 90°
Ans: (c)
a) True
b) False
Ans: (a)
a) True
b) False
Ans: (a)
Recent Post
 Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true?
a) The saturation voltage VCF of silicon transistor is more than germanium transistor.
b) The saturation voltage VCE for germanium transistor is more than silicon transistor.
c) The saturation voltage VCE for silicon transistor is same as that for germanium.
d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. Read more... |
Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct?
a) Inner electrons are always present in the semiconductor.
b) Bound electrons are always present in the semiconductor.
c) Free electrons are always present in the semiconductor.
d) Inner and bound electrons are always present in the semiconductor. Read more... |
Multiple Choice Question (MCQ) of Electronics page-15:211. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are
a) Semiconductors
b) Conductors
c) Insulators
d) Alloys Read more... |
Multiple Choice Question (MCQ) of Electronics page-14:196. In which of the following device the base resistors are not added in the package but added externally?
a) UJT
b) CUJT
c) PUT
d) None of the above Read more... |
Multiple Choice Question (MCQ) of Electronics page-13:181. The conduction in JEFT is always by the
a) Majority carriers
b) Minority carriers
c) Holes
d) Electrons
e) Holes and electrons simultaneously Read more... |
