Set 1 of 3 in the Electrical Engineering subject series — 75 solved MCQs taken only from verified past papers and solved sets. Questions shuffle on every attempt, and if you leave in the middle, your picked answers are saved in your own browser so you can continue where you left off. Tap one option per question, then press Check Answers for your score.
📚 All Electrical Engineering sets live on the Electrical Engineering MCQs subject page — finish this set, then move to the next one there.
💪 شاباش! پہلا قدم اٹھا لیا ہے
یہ quiz ہمارے پاس موجود پچھلے سالوں (2015-2025) کے اصل حل شدہ past papers سے بنایا گیا ہے — یعنی یہی سوالات اور یہی انداز اصل امتحان میں آتا رہا ہے۔
یہ مکمل کر کے اگلے quizzes بھی ضرور کرو: Electrical Engineering Set 2 اور تمام sets — اس طرح تمہاری تیاری کا بڑا حصہ مکمل ہو جائے گا۔ ہمت رکھو، کامیابی قریب ہے!
The average value of sine wave with 100V peak over half cycle is.
Correct answer: 63.7V.
To calculate the current in a circuit element using superposition theorem, the number of circuits required to solve is equal to the number of:
Correct answer: Sources.
A 40V battery is connected to a series combination of 1200 ohms and a resistance R as shown. If a voltmeter having internal resistance of 1.2k ohms is connected across 1200-ohm resistor it reads 10V. The resistance R is:
Correct answer: 1.8 k ohms.
The form in reference to alternating current wave form represents the ratio of:
Correct answer: The RMS value to the Average Value..
The hysteresis loss in the transformer occurs in:
Correct answer: The core of the transformer.
The instantaneous value of sinusoidal AC current at 45 degree is called:
Correct answer: RMS Value.
An inductor supplies with 50V AC with a frequency of 10 kHz passes a current of 7.69 mA. The value of inductor is:
Correct answer: 100 mH..
Power in AC circuit is found by:
Correct answer: VI cos theta..
The process of conversion of AC into DC is called:
Correct answer: Rectification.
To carbon brushes in a DC generator when placed at neutral magnetic axis will cause:
Correct answer: Cross Magnetization as well as Demagnetization..
A damped sinusoid will be resulted if a sinusoid signal is:
Correct answer: Multiplied by a decaying exponential..
A system is said to be shift invariant only if______
Correct answer: a shift in the input signal also results in the corresponding shift in the output.
The minimum sampling frequency needed to retain all information for the following signal is: x(t) = 3cos(50 pi t) + 10sin(400 pi t) - cos(200 pi t)
Correct answer: 400 Hz..
The Linear Time Invariant (LTI) System is said to be initially relaxed when:
Correct answer: Zero input produces zero output..
What is the period of the signal x(t) = 100 sin(12 pi t)
Correct answer: 1/6.
Determine how many significant figures the given measure has: V= 27050.0 volts
Correct answer: 6.
The entire cross section of the line conductor is utilized in DC transmission system because there is:
Correct answer: No Skin Effect.
The negative maximum of cosine wave occurs at
Correct answer: 180 degrees.
In AC circuit the power is consumed in:
Correct answer: All of the above.
The output voltage of a DC power supply drops from 33V at no load to 30V at full load. Its load regulation is:
Correct answer: 10 %.
In transformer the short circuit test is performed to determine:
Correct answer: Copper losses.
The rating of the transformer is generally expressed in:
Correct answer: KVA.
A circuit breaker is:
Correct answer: A current interrupting device.
valence electrons that leave the outer most shell is called:
Correct answer: Free electron.
_________________ is applicable only for linear systems.
Correct answer: Principle of superposition.
Thevenin's theorem is based on:
Correct answer: Circuit Equivalence.
Which one of the following is NOT a type of capacitor?
Correct answer: Polar capacitor.
Capacitor types are distinguished by the:
Correct answer: Material used as an insulator.
The property of measuring instrument, whereby it gives different indications of the same quantity value depending on the whether that the value is approached by continuously increasing or decreasing change is termed as:
Correct answer: Hysteresis.
A set four independent measurements were taken by four observers and average of their measurement is 117.06 volts, the maximum and minimum values observed were 117.11 & 117.02 volts respectively. The range of error is:
Correct answer: ±0.045 V.
Measurement techniques depending on subtraction of experimental results are avoided because:
Correct answer: The range of doubt in the final result may be greatly increased.
If we have voltage and current measurements 10 ± 0.5% V and 2 ± 0.2% A respectively. Calculate the power along with its percentage error?
Correct answer: 20 ± 0.7% W.
The synchronous generator in the power plant is also used as a motor to:
Correct answer: Improve power factor.
In AC generator the output frequency is controlled by:
Correct answer: The speed of prime mover.
In a 4-pole DC generator the electrical degrees will be:
Correct answer: Double the mechanical degrees.
In the following magnetic circuits the reluctance of the core and the air gap is 200 and 200 A.T/Wb respectively and N is 100 turns. How much will be the magnetic flux in the core if current (i) is 4 amperes.
Correct answer: 1.0 Wb.
If the air gap length in a magnetic path is 0.02m and its cross-sectional area is 0.02m2 then the reluctance of the air gap will be:
Correct answer: 10^7/(4pi) AT/Wb.
A two wattmeter method was used to measure the power of 3 phase load, the two meters read 500W and 1000W respectively. What is the total power being consumed by 3-phase loads?
Correct answer: 1.5 kW.
A 3-phase 4-wire distributor is supplying power to a star connected load and the three-line currents are 100 at angle 90 degrees A, 0 A & 10 at angle 90 degrees A respectively. Determine the current from neutral wire.
Correct answer: 110j A.
If the load voltage is 230 at angle 10 degrees V and load impedance is 23 at angle 20 degrees ohms. Determine the current in the load.
Correct answer: 10 at angle -10 degrees A.
The purpose of protection of power system is to:
Correct answer: Protect equipment, people & property, isolate faulty sections and restore normal operations..
Unsymmetrical faults in the three phase power systems are those which have:
Correct answer: Unequal fault currents in the lines and unequal phase displacements..
If a three-phase current "I" having zero phase angle is multiplied by operator a^2, it will result:
Correct answer: I(cos 240 degrees + j sin 240 degrees).
To measure power of RYB three phase system using two wattmeter W1 and W2, if current coil of W1 is connected in series with R phase and current coil of W2 is connected in series with Y phase then potential coil of W1 is connected between __________ potential coil of W2 is connected between ___________ .
Correct answer: Phases R and B, Phases Y and B.
Unsymmetrical faults that may occur in the three-phase system are _______.
Correct answer: L-G, L-L and L-L-G.
In DC generator, the brushes on commutator are shifted from geometrical neutral position to.
Correct answer: Avoid Sparking.
In D.C. generators the pole shoes are fastened to the pole core by:
Correct answer: Counter sunk screws..
Which of the following loss of DC motor decreases with increase in load?
Correct answer: None of these.
Transformer oil must be free from:
Correct answer: Moisture.
Which winding of the transformer have less cross-sectional area?
Correct answer: High voltage winding.
An ideal transformer is one which:
Correct answer: Has no losses and magnetic leakage..
The Huntron features variable range parameters resulting in hundred of voltages, source resistance and frequency combination. Which of the following is NOT true for its features?
Correct answer: Can perform power on PCB Diagnostic and Troubleshooting.
An op-amp circuit is connected to a single source to amplify the signal. If noise contribution for the signal source and the input of the amplifier is 20µ volts and 10µ volts respectively. Then the total noise input voltage is
Correct answer: sqrt((20µ)^2 + (10µ)^2).
Subtract 75 ± 5 from 275 ± 7, the answer is:
Correct answer: 200 ± 12.
A 5-digit ohm-meter has an accuracy of 3% of the reading, plus one count. The meter reads 500.00 ohms. Then the maximum error in the reading is:
Correct answer: 15.01 ohms.
To calculate the load Current and Voltage using Thevenin's Theorem, the points across the load resistor RL are marked (as A & B) and the load RL is removed. Then which of the following is not valid step for solving Thevenin's Theorem?
Correct answer: If sources are ideal, then short circuit the current source and open the voltage source.
Differential equation of an RLC circuit is second order with two roots and its response is called:
Correct answer: Critically damped if both roots are equal.
Voltage source V is connected to an RLC series circuit and its differential equation is given below. It is clear from the equation that: V = L(di/dt) + iR + (1/C) x integral of i dt (from 0 to t) + 10
Correct answer: Initial voltage across the capacitor is 10 V..
Class B push-pull transformer amplifier uses two transistors biased in such one conducts for positive cycle and other conducts for negative cycle of input waveform. Q point of the class B amplifier are, VCEQ = ______ and ICQ = ______.
Correct answer: VCC, 0.
DC Analysis is used to get required ______ and AC analysis is used to find out ____ of the amplifier.
Correct answer: Operating points, Impedances & Voltage gain.
Input Signal Vin and output signal from the VCO are fed to detector of phase locked loop (PLL) circuit. If frequency of Vin is equal to the free running frequency of the VCO then phase shift between both signals fed to detector is:
Correct answer: 90 degrees.
A sample and hold circuit is an analog device that samples the voltage of a continuously varying analog signal and holds its value at a constant level for a specified minimum period of time. A sample and hold circuit is not composed of:
Correct answer: Inductor.
In a positive feedback oscillator circuit, the closed loop gain is A.beta. If A.beta > 1 then oscillation starts and output _______ and if A.beta < 1 then oscillation starts and output ______.
Correct answer: Converts to square wave, reduces to 0..
In common-base amplifier circuit, the output is taken from the:
Correct answer: Collector.
A semiconductor device is connected in a series circuit with a battery and a resistor. If the polarity of the battery is reversed the current drops almost to zero. The device may be:
Correct answer: A pn junction.
The greatest possible amplification is obtained in:
Correct answer: A common-emitter circuit.
If the firing angle in an SCR rectifier is decreased, then output will be ________.
Correct answer: Increased.
A tunnel diode:
Correct answer: Is a highly P-N junction device..
The _____________ is the maximum available vertical fall in the water, from the upstream level to the downstream level.
Correct answer: Gross head.
Which are radial flow reaction turbines, with fixed runner blades and adjustable guide vanes, used for medium heads?
Correct answer: Francis turbines.
Which system involves sizing and drying of the feedstock, followed by thermomechanical gasification to produce a combustible gas, cooling and cleaning of the gas, and combustion in a gas turbine?
Correct answer: A gasification combined cycle.
Which one of the following is NOT a form of energy?
Correct answer: Biological.
Common mode rejection ratio (CMRR) is defined as:
Correct answer: Differential mode gain to common mode gain.
The convergence characteristics of the Newton-Raphson method of solving a load flow problem is:
Correct answer: Quadratic.
The sum of all potential differences in a complete loop through the circuit should be:
Correct answer: Equal to zero.
Finished this set? 📚 All Electrical Engineering sets · 🧠 Quiz Hub — all subjects & services · ▶ Next: Electrical Engineering Set 2
Comments ()
💬 Post a comment