Question for APTRANSCO AEE - Quiz / Questions / MCQ in English

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Latest APTRANSCO AEE Exam Question (Objective Questions), MCQ in English

Subjects : Electrical, General Intelligence & Reasoning, General Awareness, English Language & Comprehension, Quantitative Aptitude, Computer Knowledge

Question Bank APTRANSCO AEE (Electrical) Exam - English

Electrical

Q 1 :

When a very small amount of higher conducting metal is added to a conductor, its conductivity will 

1. A.increase
2. B. decrease
3. C.remain the same 
4. D.increase or decrease depending on the impurity

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Q 2 :

A semiconductor differs from a conductor in that it has

1. A.Only one path for the free electrons in the valence band
2. B.Only one path for holes in the conduction band
3. C.Two paths followed by free electrons and holes, one an ordinary path in the conduction band and the other one an extraordinary path in the valence band, respectively 
4. D.Two paths followed by free electrons and holes, one an extraordinary path in the conduction band and the other one an ordinary path in valence band, respectively 

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Q 3 :

Which of the following circuits is used for converting a sine wave into a square wave?

1. A.Monostablemultivibrator
2. B.Bistablemultivibrator
3. C.Schmitt trigger circuit 
4. D.Darlington complementary pair

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Q 4 :

If a square matrix of order 100 has exactly 15 distinct eigenvalues, then the degree of the minimum polynomial is 

1. A.At least 15 
2. B.At most 15 
3. C.Always 15 
4. D.Exactly 100

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Q 5 :

For high speed reading and storing of information in a computer, the core shall be of 

1. A.Ferrite 
2. B.Piezoelectric 
3. C.Pyroelectric 
4. D.Ferromagnetic above 768°C

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Q 6 :

Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is

                 

1. A.0.8 Ω
2. B.1.4 Ω
3. C.2 Ω
4. D.2.8 Ω

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Q 7 :

For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10^-6 (ohm-m)^-1, the electron and hole nobilities are 0.85 m²/V-s and 0.04 m²/V-s respectively. What is the intrinsic carrier concentration at the room temperature?

1. A.7.0 × 10¹² m^-3
2. B.7.0 × 10^-12 m^-3
3. C.7.0 × 10^-12 m³
4. D.7.0 × 10¹² m³

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Q 8 :

The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m²/V-s and the hole mobility is 0.18 m²/V-s?

1. A.9.2 × 10⁵/m³
2. B.2.77 × 10³/m³
3. C.2.43 × 10¹⁹/m³
4. D.8.9 × 10¹²/m³

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Q 9 :

Heat conduction in a semiconductor takes place

1. A.By the mobility of the carriers
2. B.Due to energy gap between conduction band and valency band
3. C.By the holes and thermal vibrations of atoms
4. D.By the electrons and thermal vibrations of atoms

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Q 10 :

Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is

1. A.Parallel polarized
2. B.Perpendicularly polarized
3. C.Normally polarized
4. D.None of the above

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Q 11 :

An electrical breakdown of a p-n junction occurs if

1. A.Forward voltage increases up to the rating
2. B.Reverse voltage increases beyond the rating
3. C.Forward voltage decreases below the rating
4. D.Reverse voltage decreases below the rating

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Q 12 :

The chief deterrent to the widespread application of superconducting materials is

1. A.Very difficult to form, machine or case
2. B.The difficult in attaining and maintaining extremely low temperature
3. C.The poor strength-to-weight ratio
4. D.The lower oxidation rate at elevated temperatures

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Q 13 :

Which one of the following properties is not observed in the carbon nanotubes ?

1. A.High stiffness and strengths
2. B.Low densities
3. C.Unusual electrical property
4. D.Non-ductile

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Q 14 :

The evidence for the importance of electron-phonon interaction in super-conductors comes from

1. A.Meissner effect
2. B.Josephson effect
3. C.Isotope effect
4. D.x quantization experiments

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Q 15 :

Which one of the following materials is used for cable insulation ?

1. A.Phenol formaldehyde
2. B.Polytetrafluoroethylene
3. C.Polyvinyl chloride
4. D.Acrylonitrile butadiene styrene

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Q 16 :

For high speed reading and storing of information in a computer, the material used is

1. A.Ferrite
2. B.Piezoelectric
3. C.Pyroelectric
4. D.Ferromagnetic above 768°C

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Q 17 :

The temperature above which an anti-ferromagnetic material becomes paramagnetic is called

1. A.Peak temperature
2. B.Neel temperatur
3. C.Critical temperature
4. D.Weiss temperature

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Q 18 :

Which effect is the converse of Peltier effect ?

1. A.Seeback effect
2. B.Thomson effect
3. C.Hall effect
4. D.Joule effect

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Q 19 :

Magnetic materials which may be readily magnetized in either direction are

1. A.Soft magnetic materials
2. B.Hard magnetic materials
3. C.High eddy current loss materials
4. D.High hysteresis loss materials

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Q 20 :

Consider the following statements regarding a ferromagnetic material:
1.Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
2.The coercive force is the filed required to reduce the flux density to zero. 
Which of the above statements is/are correct?

1. A.Both 1 and 2
2. B.Neither 1 nor 2
3. C.1 only
4. D.2 only

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Q 21 :

Resistance switching is normally resorted in case of

1. A.Air blast CB
2. B.Bulk oil CB
3. C.Minimum oil CB
4. D.All types of CB

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Q 22 :

By transmitting power at high voltage

1. A.it will give poor voltage regulation
2. B.it will give better voltage regulation
3. C.it will not effect voltage regulation
4. D.None of these

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Q 23 :

Which statement about the daily load curve is valid ?

1. A.The area under the curve gives the average demand
2. B.The ratio of the area under the curves to the total area of rectangle in which it is contained gives the load factor for the day
3. C.The peak of the curve gives the installed capacity of the plant
4. D.The area of the curves divided by the number of hours gives load factor

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Q 24 :

High voltage Schring bridge is used to measure

1. A.large capacitance without additional element
2. B.small capacitance without additional element
3. C.medium value capacitance
4. D.None of these

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Q 25 :

Draw - in - system of laying underground cables has the drawback (s) of

1. A.higher cost
2. B.reduced current carrying capacity of the cables
3. C.requirements of much deeper and wider trenches
4. D.repairs, alterations or additions difficult
5. E.all of the above except

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Q 26 :

Surge impedance of a transmission line is

1. A.independent of its length
2. B.dependent on its length
3. C.independent on its temperature
4. D.none of the above

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Q 27 :

If two synchronous generators connected in parallel loose synchronism, it will lead to

1. A.stalling of generators
2. B.wild fluctuations in current
3. C.wild fluctuations in current and voltage
4. D.None of these

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Q 28 :

A differential relay responds to

1. A.algebraic difference of two or more similar electrical quantities
2. B.vector difference of two or more similar electrical quantities
3. C.algebraic difference between two currents
4. D.algebraic difference between two voltages

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Q 29 :

The conductor carries more current on the surface in comparison to its core. This phenomenon is called the

1. A.Skin effect
2. B.Corona
3. C.Ferranti effect
4. D.Lenz's effect

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Q 30 :

A booster is connected in

1. A.series with the feeder
2. B.parallel with the feeder
3. C.both (a) and (b) are correct
4. D.none of these

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Q 31 :

Fuses have got advantages of

1. A.cheapest type of protection
2. B.inverse time - current characteristic
3. C.no maintenance
4. D.current limiting effect under short - circuit conditions
5. E.all of the above

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Q 32 :

The power transmitted will be maximum when

1. A.line reactance is high
2. B.corona losses are minimum
3. C.sending end voltage is more
4. D.receiving end voltage is more

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Q 33 :

The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is

1. A.0.75
2. B.0.375
3. C.1.33
4. D.None of these

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Q 34 :

In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided

1. A.only the leakage impedance drop is ignored
2. B.only the core loss is ignored
3. C.both the leakage impedance drop and the core loss are ignored
4. D.only the no - load copper loss is ignored

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Q 35 :

Which of the following techniques is used for the measurements of a.c. high frequency voltages ?

1. A.Peak voltmeter
2. B.Series resistance mircro - ammeter
3. C.Resistance potential divider
4. D.All of these

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Q 36 :

Use of additional shunt capacitor can be made for increasing the capability of line as it

1. A.reduces surge impedance Z₀
2. B.increases phase shift β
3. C.increase in α
4. D.all of the above

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Q 37 :

The sag of a transmission line is least affected owing to

1. A.weight of the conductor
2. B.current through the conductor
3. C.atmospheric temperature
4. D.ice deposited on the conductor

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Q 38 :

In case of Impulse Thermal break down of solid insulating materials, the critical electric field is proportional to

1. A.critical absolute temperature
2. B.square of critical absolute temperature
3. C.square of T₀
4. D.none of these

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Q 39 :

The insulation of the modern EHV lines is designed based on

1. A.corona
2. B.switching voltages
3. C.lightning voltage
4. D.all of these

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Q 40 :

For constant voltage transmission, the voltage drop along the line is maintained constant by installing

1. A.capacitors
2. B.inductors
3. C.resistors
4. D.synchronous phase modifiers at the receiving end

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Q 41 :

What is the primary purpose of the Laplace transform in network analysis?

1. A.To solve differential equations in the time domain
2. B.To convert time-domain signals to frequency domain
3. C.To analyze discrete systems
4. D.To synthesize network components

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Q 42 :

What is the Laplace transform of a unit step function u(t)?

1. A.1/s
2. B.s
3. C.e(-s)
4. D.1/(s+1)

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Q 43 :

Which property of the Laplace transform is used to handle initial conditions in network analysis?

1. A.Linearity
2. B.Time-shifting
3. C.Differentiation in time domain
4. D.Convolution

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Q 44 :

What is the Laplace transform of the derivative of a function f(t)?

1. A.sF(s)
2. B.sF(s) - f(0)
3. C.F(s)/s
4. D.F(s) + f(0)

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Q 45 :

What is the primary application of the Laplace transform in circuit analysis?

1. A.Solving algebraic equations
2. B.Solving differential equations for transient response
3. C.Analyzing steady-state response
4. D.Synthesizing network components

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Q 46 :

What is the Laplace transform of an exponential function e(-at)?

1. A.1/(s+1)
2. B.Decrease the speed
3. C.Have no effect on speed
4. D.Increase the torque

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Q 47 :

Which transform is used to analyze the frequency response of a network?

1. A.Laplace transform
2. B.Fourier transform
3. C.Z-transform
4. D.Hilbert transform

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Q 48 :

What is the primary advantage of using the Fourier transform in network analysis?

1. A.Handles initial conditions
2. B.Analyzes steady-state sinusoidal signals
3. C.Solves discrete systems
4. D.Synthesizes networks

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Q 49 :

Which property of the Fourier transform is used to analyze convolution in networks?

1. A.Linearity
2. B.Time-shifting
3. C.Convolution theorem
4. D.Frequency-shifting

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Q 50 :

What is the Laplace transform of a unit impulse function (t)?

1. A.1
2. B.s
3. C.1/s
4. D.e(-s)

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