Electrical Engineering · Question Bank

Electrical Transients

72 questions · page 4 of 4. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 72Problem solving 59Objective 13
DifficultyAll 72Easy 34Medium 29Hard 9
#61📜 EE Pre-Board August 2017📘 PowerhouseMedium
A 1.5 MΩ resistor is connected in series with a 20 μF capacitor. The voltage source is 120 volts dc. Determine the time at which the voltage across the capacitor is 75% of the source voltage.
A41.6 s
B30 s
C20.8 s
D8.6 s
#62📜 EE Pre-Board March 2018📘 PowerhouseEasy
The double energy transient occur in the
Apurely inductive circuit
BR-L Circuit
CR-C Circuit
DR-L-C Circuit
#63📜 EE Pre-Board March 2018📘 PowerhouseMedium
The field circuit of a 4-pole dc generator has a resistance of 200 Ω and an inductance of 100 H. If it is connected to a 400 V supply, find the time taken for the current to reach 1.5 A.
A0.125 sec
B1.5 sec
C0.369 sec
D0.693 sec
#64📜 EE Pre-Board March 2018📘 PowerhouseMedium
A 60 μF capacitor is connected in series with a 40,000 Ω resistor. If the capacitor is initially uncharged, determine the resistor voltage when t = 1.5 time constants for a suddenly applied source emf of 120 volts.
A93.22v
B120v
C80v
D26.78v
#65📜 EE Pre-Board March 2018📘 PowerhouseEasy
The time constant of a series RC circuit is given by
AR/C
BRC²
CRC
DR² C
#66📜 EE Pre-Board August 2018📘 PowerhouseEasy
In a loss-free RLC circuit, the transient current is
Aoscillating
BSquare wave
Csinusoidal
Dnon-oscillating
#67📜 EE Pre-Board August 2018📘 PowerhouseMedium
A coil having a resistance of 10 Ω and an inductance of 4 H is switched across a 20 V dc source. Calculate the rate of current change when the current reaches 50% of its final steady value.
A2.5 A/s
B3.5 A/s
C4.5 A/s
D5.5 A/s
#68📜 EE Pre-Board August 2018📘 PowerhouseEasy
Transient current in an RLC circuit is oscillatory when
AR = 0
B\(R = 2\sqrt{L/C}\)
C\(R \gt 2\sqrt{L/C}\)
D\(R \lt 2\sqrt{L/C}\)
#69📘 EE Pocket Reviewer RojasEasy
Transient current in an RLC circuit is oscillatory at which of the following circuit conditions?
AWhen \(R = 0\)
BWhen \(R \gt 2\sqrt{L/C}\)
CWhen \(R \lt 2\sqrt{L/C}\)
DWhen \(R = 2\sqrt{L/C}\)
#70📘 EE Pocket Reviewer RojasEasy
How can the time constant of an RC circuit be increased?
ABy increasing the resistance
BBy decreasing the resistance
CBy decreasing the capacitance
DEither B or
#71📘 EE Pocket Reviewer RojasEasy
A capacitance C is charged through a resistance R. The time constant of the circuit is
AR/C
BC/R
CRC
D1/RC
#72📘 EE Pocket Reviewer RojasEasy
Double energy transients are produced in circuits consisting of which one?
ATwo or more resistors
BResistance and inductance
CResistance and capacitance
DResistance, inductance and capacitance

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