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Objective Questions

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

Subjects : Subject Knowledge (Electrical), General Knowledge, Numerical & Reasoning Ability

Question Bank NMDC Maintenance Assistant Electrical (Trainee) Exam - English
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Subject Knowledge (Electrical)

Question 1Single Answer
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
Question 2Single Answer
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
Question 3Single Answer
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 
Question 4Single Answer
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 
Question 5Single Answer
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
Question 6Single Answer
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 
Question 7Single Answer
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
Question 8Single Answer
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
Question 9Single Answer
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 
Question 10Single Answer
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 
Question 11Single Answer
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
Question 12Single Answer
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
Question 13Single Answer
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 
Question 14Single Answer
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
Question 15Single Answer
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
Question 16Single Answer
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
Question 17Single Answer
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
Question 18Single Answer
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
Question 19Single Answer
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
Question 20Single Answer
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
Question 21Single Answer
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
Question 22Single Answer
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
Question 23Single Answer
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
Question 24Single Answer
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
Question 25Single Answer
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
Question 26Single Answer
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
Question 27Single Answer
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
Question 28Single Answer
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
Question 29Single Answer
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
Question 30Single Answer
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

General Knowledge

Question 31Single Answer
Which Windows interface element typically appears to display information, a warning, an error message, or a request for confirmation?
  1. A
    Window
  2. B
    Pop-up menu
  3. C
    Message box
  4. D
    Taskbar
Question 32Single Answer
What is active desktop ?
  1. A
    a term that is synonymous with viewing your desktop as web page
  2. B
    a feature to customize your desktop to display informating you can update from the internet
  3. C
    both a and b above mentioned
  4. D
    A software
  5. E
    None of these
Question 33Single Answer
Yojna a weekly journal
  1. A
    Ministry of Finance        
  2. B
    Ministry of Information and Broadcastin
  3. C
    Ministry of Rural Development
  4. D
    Planning Commission
Question 34Single Answer
Kurukshetra a journal on rural development is published by
  1. A
    Ministry of Finance 
  2. B
    Ministry of Information and Broadcastin
  3. C
    Ministry of Rural Development
  4. D
    Planning Commission
Question 35Single Answer
Devaluation of a currency means
  1. A
    Fixing the value of the currency in conjuction with the movement in the value of a basket of predetermined currencies
  2. B
    Reduction in the value of a currency vis-à-vis major internationally traded currencies
  3. C
    Fixing the value of currency in multilateral consultaion with the IMF the World Bank and major trading partners
  4. D
    Permitting the currency to seek its worth in the international market
Question 36Single Answer
In India rural incomes are generally lower than the urban incomes, which of the following reasons account for this
            1. a large number of farmers are illiterate and know little about scientific agriculture
            2. prices of primary products are lower than those of manufactured products
            3. Investments in agriculture has been low when compared to investment in industry
  1. A
    1 and 3
  2. B
    2 and 3
  3. C
    1 and 2
  4. D
    1,2 and 3
Question 37Single Answer
Which of the following programmes aims at the promotion of savings among rural women
  1. A
    Rashtriya Mahila Kosh
  2. B
    Indira Mahila Yojna
  3. C
    Jawahar Rozgar Yojna
  4. D
    Mahila Samridhi Yojna
Question 38Single Answer
What is Net National Product
  1. A
    the money value of final goods and services produced annually in the economy
  2. B
    the money value of annual service generation in the economy
  3. C
    the money value of tangible goods produced annually in the economy
  4. D
    The money value of tangible goods available in the economy
Question 39Single Answer
National income is the 
  1. A
    net national product at market price
  2. B
    net national product at factor cost
  3. C
    net domestic product at market price
  4. D
    net domestic product at factor cost
Question 40Single Answer
Chelliah Committee of 1992 deals with the overhauling of our
  1. A
    financial system            
  2. B
    tax system
  3. C
    patents and copyrights  
  4. D
    Public sector undertakings
Question 41Single Answer
During which Five Year Plan was the annual growth rate of National Income the lowest
  1. A
    2nd plan
  2. B
    3rd plan
  3. C
    5th plan
  4. D
    6th plan
Question 42Single Answer
Which of the following taxes is a progressive tax
  1. A
    sales tax           
  2. B
    custom tax
  3. C
    excise tax         
  4. D
    income tax
Question 43Single Answer
Which of the following estimates the National Income in India
  1. A
    National Income Committee
  2. B
    Planning Commission
  3. C
    Reserve Bank Of India
  4. D
    Central Statistical Organisation
Question 44Single Answer
India changed over to the decimal system, coinage in
  1. A
    April 1951         
  2. B
    April 1955
  3. C
    April 1957         
  4. D
    April 1978
Question 45Single Answer
11th Five Year Plan aim at achieving 10% rural tele density in India from the present 1.9% by the year
  1. A
    2008     
  2. B
    2009
  3. C
    2010     
  4. D
    2012
Question 46Single Answer
Which one of the following statements Monitorable Socio Economic Target of the 11th Five Year Plan under the head Environment is not correct
  1. A
    treat urban waste water by 2011-12
  2. B
    Increase energy efficiency by 20% points by 2016-17
  3. C
    attain WHO standards of air quality in all major cities by 2011-12
  4. D
    increase forest and tree cover by 15% points
Question 47Single Answer
Who is the ex-officio chairman of Planning commission and National Development Council
  1. A
    President
  2. B
    Prime Minister
  3. C
    Finance Minister
  4. D
    Commerce Minister
Question 48Single Answer
In ruby laser, the stimulated emission is due to transition from
  1. A
    metastable state to any lower state
  2. B
    any higher state of lower state
  3. C
    metastable state to ground state
  4. D
    any higher state to ground state
Question 49Single Answer
A direct current I flows along the length of an infinitely long straight thin walled pipe, then the magnetic field is
  1. A
    uniform throughout the pipe not zero
  2. B
    zero only along the axis of the pipe
  3. C
    zero at any point inside the pipe
  4. D
    maximum at the centre and minimum at the edge
Question 50Single Answer
10-6 M NaOH is diluted 100 times. The pH of the diluted base is
  1. A
    between 7 and 8
  2. B
    between 5 and 6
  3. C
    between 6 and 7
  4. D
    between 10 and 11
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