Question for SMC Maintenance Assistant - Quiz / Questions / MCQ in English

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Latest SMC Maintenance Assistant Exam Question (Objective Questions), MCQ in English

Subjects : Subject Related Knowledge (Electrical)

Question Bank SMC Maintenance Assistant Exam (Electrical) - English

Subject Related Knowledge (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 :

An electrically balanced atom has 30 protons in its nucleus and 2 electrons in its outermost shell. The materials made of such atom is

1. A.a conductor
2. B.an insulator
3. C.a semiconductor 
4. D.a superconductor

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Q 3 :

The temperature coefficient of resistance of a doped semiconductor is

1. A.always positive
2. B.always negative
3. C.zero 
4. D.positive or negative depending upon the level of doping 

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Q 4 :

In the slice processing of an integrated circuit

1. A.components are formed in the areas where silicon dioxide remains
2. B.components are formed in the areas where silicon dioxide has been removed
3. C.the diffusing elements diffuse through silicon dioxide 
4. D.only on diffusion process is used 

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Q 5 :

Permanent magnet loses the magnetic behaviour when heated because of
1. atomic vibration
2. dipole vibration
3. realignment of dipoles
Which of the above are correct?

1. A.1  and 2 only 
2. B.1 and 3 only
3. C.1, 2 and 3         
4. D.2 and 3

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Q 6 :

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 7 :

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 8 :

Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law ?

1. A.Capacitors
2. B.​Inductors
3. C.Transistors
4. D.Resistance

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Q 9 :

Consider the following statements: A power supply uses bridge rectifier with a capacitor input filter. If one of the diodes is defective, then
1. The dc load voltage will be lower than its expected value
2. Ripple frequency will be lower than its expected value
3. The surge current will increase considerably
Which of the above statements are correct?

1. A.1  and 2 only 
2. B.1 and 3 only
3. C.2 and 3 only 
4. D.1, 2 and 3 

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Q 10 :

Three identical amplifiers each having a voltage gain of 50 are cascaded. The open loop voltage gain of the combined amplifier is

1. A.71 dB 
2. B.82 dB 
3. C.91 dB 
4. D.102 dB 

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Q 11 :

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 12 :

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 13 :

Soft magnetic materials should have 

1. A.Large saturation magnetization and large permeability 
2. B.Low saturation magnetization and large permeability 
3. C.Large saturation magnetization and low permeability 
4. D.Low saturation magnetization and low permeability 

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Q 14 :

Orbital magnetic moment of an electron, in an atom, is of the order of 

1. A.0.1 Bohr magneton 
2. B.1.0 Bohr magneton 
3. C.10 Bohr magneton 
4. D.100 Bohr magneton

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Q 15 :

When the temperature of a ferromagnetic material exceeds the Curie temperature, it behaves similar to a 

1. A.Diamagnetic material 
2. B.Ferrimagnetic material 
3. C.Paramagnetic material 
4. D. Antiferromagnetic material

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Q 16 :

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 17 :

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 18 :

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 19 :

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 20 :

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 21 :

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 22 :

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 23 :

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 24 :

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 25 :

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 26 :

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 27 :

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 28 :

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 29 :

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 30 :

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 31 :

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 32 :

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 33 :

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 34 :

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 35 :

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 36 :

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 37 :

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 38 :

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 39 :

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 40 :

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 41 :

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 42 :

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 43 :

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 44 :

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 45 :

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 46 :

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 47 :

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 48 :

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 49 :

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 50 :

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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