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In a series RLC circuit at resonance, which of the following quantities attains maximum value ? (A) Current (B) Voltage (C) Power (D) None of the above

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1 answer 15 views

In a series RLC circuit at resonance, the magnitude of the voltage developed across the capacitor  A) Is always zero B) Can never be greater than the input voltage C) Can be greater than the input voltage, however, it is 90° out of phase with the input voltage D) Can be greater than the input voltage, and is in phase with the input voltage

asked May 20, 2018 in Network Analysis by Shimroz123
1 answer 20 views

Consider the following statements with respect to a high Q, series RLC circuit under resonance 1. The voltage across R is equal to the applied voltage 2. The voltage across L and C are zero 3. The voltage across L and C are equal in magnitude 4. The voltage accross L and C are maximum Which of these statements are correct?

asked May 24, 2018 in Electrical Engineering by Shimroz123
0 answers 22 views

In a series RLC circuit, the rms value of voltage across the resistor is 30 V, across the inductor is 60 V and across the capacitor is 20 V. The rms supply voltage would be (A) 110 V (B) 10 V (C) 220 V (D) 50 V

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 9 views

Resonance occurs in RLC series circuit when  A) When the supply voltage and current are in phase B) When inductive reactance become equal to capacitive reactance C) When voltage across the inductor become equal to the voltage across the capacitor D) All of the above

asked Apr 9, 2018 in Electrical Engineering by Zeeshan
1 answer 17 views

In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
0 answers 15 views

A series RLC circuit resonate at 200 Hz. If the capacitance is increased to four times, the circuit will be in resonance at   (a) 100 Hz (b) 200 Hz (c) 400 Hz (d) 800 Hz  

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

asked Apr 30, 2018 in Power system by Shimroz123
0 answers 12 views

In a series RLC circuit, which one does not change with change in input frequency ? (A) Bandwidth (B) Quality factor (C) Resonant frequency (D) All of them

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 11 views

Which of the following is true at resonance in LC circuits? A) The series impedance of the two elements is at a maximum and the parallel impedance is at minimum B) The series impedance of the two elements is at a maximum and the parallel impedance is also at maximum C) The series impedance of the two elements is at a minimum and the parallel impedance is also at minimum D) The series impedance of the two elements is at a minimum and the parallel impedance is at maximum

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 30 views

The Q factor of a coil at resonant frequency 1.5 MHz of an RLC series circuit is 150. The Bandwidth is : - a) 225 MHz b) 1.06 MHz c) 10 KHz d) 10 MHz

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
1 answer 13 views

Which of the following statements is incorrect? A) During parallel resonance impedance at resonance is minimum B) During parallel resonance current is magnified C) During series resonance current at resonance is maximum D) During series as well as parallel resonance, the power factor is unity

asked Jun 17, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

For a series resonant circuit, at the half power points,which of the following is true?  (a) Current is half of the current at resonance. (b) Resistance is equal to the reactance. (c) The impedance is half the impedance at the resonance. (d) None of the above

asked May 16, 2018 in Electronics Engineering by Shimroz123
1 answer 4 views

in Series LCR circuit, at resonance:  (1) Current is maximum and power factor is zero (2) Current is maximum and power factor is unity (3) Current is minimum and power factor is unity (4) None of these

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 56 views

For an RLC series AC circuit, the current at series resistance is (a) maximum at lagging power factor (b) maximum at leading power factor (c) maximum at unity power factor (d) minimum at unity power factor  

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

In a series resonant circuit, maximum voltage across L occurs at  (a) Resonant frequency (b) Slightly below resonant frequency (c) Slightly above resonant frequency (d) At a frequency where I is maximum

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
1 answer 8 views

In a series RLC circuit that is operating above the resonant frequency, the current : -  a) lags the applied voltage b) leads the applied voltage c) is in phase with the applied voltage d) is zero

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

What is the maximum value of a load which consume 500 KWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the maximum demand? 

asked Mar 27, 2018 in Power system by Shimroz123
1 answer 48 views

A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = _:  (1) Zero (2) Infinity (3) L/R (4) R/L 

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 16 views

Which of the following is true with a series circuit having resistors of different values? A) The total resistance of the circuit is the sum of the individual resistances B) The current across each resistor is the same C) The voltage drop across each resistor depends on the value of the resistor D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

A series RLC circuit has a resistance of 50 , inductance of 0.4H and a capacitor of 10µF. The circuit is connected across a 100V supply. The resonance frequency and the current through the resistance are 

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

In a series RLC circuit operating below the resonant frequency the current  (a) I leads Vs (b) I lags Vs (c) I is in Phase with Vs (d) None of these

asked May 16, 2018 in Network Analysis by Shimroz123
1 answer 25 views

The series and parallel resonance on L-C circuit differs in that?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C is doubled from its original value, the new Q of the circuit is:  (1) 25 (2) 50 (3) 100 (4) 200

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 26 views

For a waveform to be expressed in Fourier series, which of the following conditions must be satisfied? I. Maxwell’s conditions, II. Drichlet conditions, III. Sampling Theorem A) I only B) II only C) II and III only D) I, II and III

asked Jun 17, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

Which of the following will happen if a voltmeter is connected like an ammeter in series to the load ? (A) There will be almost no current in the circuit. (B) The meter will burn. (C) The measurement will be trio high. (D)  A very high current will flow.

asked May 12, 2018 in Electrical Engineering by Shimroz123
2 answers 24 views

Magnitude of current at resonance in R-L-C circuit?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
2 answers 36 views

The power factor at resonance in R-L- C parallel circuit is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
0 answers 14 views

In an RLC series AC circuit, if frequency is below the resonant frequency, then (a) XC = XL (b) XC < XL (c) XC > XL (d) None of these 

asked May 25, 2018 in Network Analysis by Shimroz123
1 answer 61 views

In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

asked May 1, 2018 in Network Analysis by Shimroz123
1 answer 19 views

In a series L-C circuit at the resonant frequency the?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 28 views

Which of the following is used in a circuit breaker as the medium in which the arc forms? A) Insulating gas B) Insulating oil C) Vacuum D) All the above

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 8 views

For a series R -C circuit, the power factor corresponding to maximum power is (a) 0-5 lag (b) 0.5 lead (c) 0.707 lag (d) 0-707 lead

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
0 answers 27 views

For a stepper motor which of the following torque has the highest numerical value ? (A) Detent torque (B) Pull -in torque (C) Pullout torque (D) Holding torque

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value?  

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

Which of the following series combinations of resistors dissipates the most power when connected across a 120 V source? A. One, 220Ω resistor B. Two, 220Ω resistors C. Three, 220Ω resistors D. Four, 220Ω resistors

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 5 views

At series resonance, (A) Circuit impedance is maximum (B) Circuit current is minimum (C) Voltage across L or C is zero (D) Power factor is unity

asked May 12, 2018 in Electrical Engineering by Shimroz123
0 answers 21 views

Which of the following circuit breaker is generally used in railway electrification ?   (a) Air Blast circuit breaker (b) Minimum Oil circuit breaker (c) Bulk Oil circuit breaker (d) SF6 circuit breaker  

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

At temperatures above a limiting value, the energy of lattice vibrations, in a conductor, increases linearly with temperature so that resistivity increases linearly with temperature. In this region, this limiting value of temperature is called

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

In a Bode magnitude plot, which one of the following slopes would be exhibited at high frequencies by a 4th order all-pole system? (A) – 80 dB/decade (B) – 40 dB/decade (C) +40 dB/decade (D) +80 dB/decade

asked Apr 26, 2018 in Control System by Shimroz123
1 answer 40 views

Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be

asked Apr 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 23 views

Which of the following connection of transformers will give highest value of secondary voltage ? (A) Delta primary delta secondary (B) Delta primary star secondary (C) Star primary star secondary (D) Star primary delta secondary

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 391 views

In which of the following transmission lines, the value of the Shunt admittance should be approximated to zero ? (A) A 66 kV 35 km long line (B) A 132 kV 200 km long line (C) A 220 kV 300 km long line (D) A 400 kV 500 km long line

asked May 8, 2018 in Electric Power Transmission by Shimroz123
0 answers 21 views

A dc shunt motor runs at 500 r.p.m at 220 V. A resistance of 4.5 Ω is added in series with the armature for speed control. The armature resistance is 0.5 ohms. The current to stall the motor will be (1) 44 A (2) 50 A (3) 44.4 A (4) 60 A  

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

 Which of these represent short in a series circuit?  a) Increase in resistance b) Increase in current c) Increase in voltage d) Increase in conductance

asked Apr 10, 2018 in Instrumentation and control by Shimroz123

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