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Objective Questions

Latest ECIL Scientific Officer Exam Question (Objective Questions), MCQ in English

Subjects : Computer Science, Reasoning, Electrical Engineering, Quantitative Aptitude, General Knowledge

Question Bank ECIL Scientific Officer Officer Exam (Electrical) - English
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Computer Science

Question 1Single Answer
When two number are added in excess-3 code and the sum is less than 9 , then in order to get the correct answer it is necessary to
  1. A
    subtract 0011 from the sum
  2. B
    add 0011 to the sum
  3. C
    subtract 0110 from the sum
  4. D
    add 0110 to the sum
Question 2Single Answer
The characteristic equation of an SR filp-flop is given by
  1. A
    Qn+1 = S+RQn          
  2. B
    Qn+1 = S n+   Qn 
  3. C
    Qn+1 =  + RQn  
  4. D
    Qn+1 = S+ Qn 
Question 3Single Answer
A graph with n vertices and n-1 edges that is not a tree , is
  1. A
    Connected 
  2. B
    disconnected
  3. C
    Euler  
  4. D
    A circuit
Question 4Single Answer
Networks that use different technologies can be connected by using
  1. A
    Packets
  2. B
    Switches
  3. C
    Bridges
  4. D
    Routers
Question 5Single Answer
A read bit can be read
  1. A
    and written by CPU
  2. B
    and written by peripheral
  3. C
    by peripheral and written by CPU
  4. D
    by CPU and written by the peripheral
Question 6Single Answer
The term ‘aging’ refers to
  1. A
    booting up the priority of the process in multi-level of queue without  feedback  .
  2. B
    gradually increasing the priority of job that wait in the system for a long  time to remedy infinite booking .
  3. C
    keeping track of the following a page has been in memory for the purpose of LRU replacement .
  4. D
    letting jobs reside in memory for a certain amount of time so that the no pages required can be estimated accurately
Question 7Single Answer
Consider a set of n tasks with known runtimes r1 ,r2………….. rn  To be run on a uni processor machine . Which of the following processer scheduling algorithms will result in the maximum throughput ?
  1. A
    Round Robin
  2. B
    Shortest job first
  3. C
    Highest response ratio first
  4. D
    First come first served
Question 8Single Answer
Consider a job scheduling program with 4 jobs J1 , J2, J3 and J4  With corresponding deadlines : (d1 , d2 , d3 , d4) = (4, 2, 4, 2). Which of the following is not a feasible schedule without violating any job schedule?
  1. A
    J2, J4, J1, J3       
  2. B
    J4, J1, J2, J3
  3. C
    J4, J2, J1, J3   
  4. D
    J4, J2, J3, J1
Question 9Single Answer
By using a eight bit optical encoder the degree of resolution that can be obtained is (approximately)
  1. A
    1.8o       
  2. B
    3.4 o
  3. C
    2.8 o   
  4. D
    1.4 o
Question 10Single Answer
The principal of the locality of reference justifies the use of
  1. A
    virtual memory            
  2. B
    interrupts
  3. C
    main memory    
  4. D
    cache memory

Reasoning

Question 11Single Answer
‘Gram’ is relatd to ‘Mass’ in the same way as ‘Centimetre’ is related to
  1. A
    Area
  2. B
    Volume
  3. C
    Length
  4. D
    Sound
  5. E
    Energy
Question 12Single Answer
'Mustard' is related to 'Seed' in the same way as 'Carrot' is related to
  1. A
    Fruit
  2. B
    Stem
  3. C
    Flower
  4. D
    Root
  5. E
    None of these
Question 13Single Answer
Which of the following pairs of words have the same relationship as Fan : Heat?
  1. A
    Water        :           Drink
  2. B
    Light         :        Night
  3. C
    Teach       :      Student
  4. D
    Air             :        Breathe
  5. E
    Food         :        Hunger
Question 14Single Answer
'Radish' is related to 'Root', in the same way as 'Brinjal' is related to
  1. A
    Fruit
  2. B
    Stem
  3. C
    Flower
  4. D
    Root
  5. E
    None of these
Question 15Single Answer
'Jackal' is related to 'Carnivorous', in the same way as 'Goat' is related to
  1. A
    Omnivorous
  2. B
    Carnivorous
  3. C
    Herbivorous
  4. D
    Multivorous
  5. E
    None of these
Question 16Single Answer
Which of the following pairs has similar relationship as Run : Race?
  1. A
    Party : Dance
  2. B
    Study : Book
  3. C
    Lecture : Study
  4. D
    Enjoy : Journey
  5. E
    None of these
Question 17Single Answer
Which of the following has same relationship as that of Money : Wealth?
  1. A
    Pity : Kindness
  2. B
    Cruel : Anger
  3. C
    Wise : Education
  4. D
    Pride : Humility
  5. E
    None of these
Question 18Single Answer
Which of the following is related to ‘Melody’, in the same way as ‘Delicious’ is related to 'Taste'?
  1. A
    Memory
  2. B
    Highness
  3. C
    Tongue
  4. D
    Speak
  5. E
    Voice
Question 19Single Answer
Offhand’ is related to ‘Premeditation’ in the same way as ‘Above board’ is related to
  1. A
    Integrity
  2. B
    Honesty
  3. C
    Guide
  4. D
    Competition
  5. E
    None of these
Question 20Single Answer
5 : 7 : : ? : 28
  1. A
    20
  2. B
    14
  3. C
    56
  4. D
    26
  5. E
    None of these
Question 21Single Answer
Which one is different form the remaining three?
  1. A
    GIJK
  2. B
    DFGH
  3. C
    CEFG
  4. D
    ABCD
  5. E
    None of these
Question 22Single Answer
Three of the following four are alike in certain way and so form a group. Which is one that does not belong to the group?
  1. A
    71
  2. B
    73
  3. C
    77
  4. D
    67
  5. E
    None of these
Question 23Single Answer
Unscramble the letters in the given words and find the odd one out.
  1. A
    UMRSME
  2. B
    EIWNTR
  3. C
    PIGRSN
  4. D
    LCUOD
  5. E
    None of these
Question 24Single Answer
What should come next in the following number series?
0 2 4 6 2 3 0 2 4 6 4 5 0 2 4 6 6 7 0 2?
  1. A
    4
  2. B
    2
  3. C
    6
  4. D
    8
  5. E
    5
Question 25Single Answer
What will be there is the place of question mark in the following series?
E G 3 5, I K 9 9, M O 1 9 5, Q S 3 2 3?
  1. A
    UW483
  2. B
    ZA26
  3. C
    TU420
  4. D
    ST380
  5. E
    None of these

Electrical Engineering

Question 26Single 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 27Single 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 28Single 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 29Single 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 30Single 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 31Single Answer
A Zener regulator has an input voltage varying between 20 V and 30 V. The desired regulated voltage is 12 V, while the load varies between 140  and 10k  The maximum resistance in series with the unregulated source and Zener diode would be
  1. A
    3.3
  2. B
    6.6
  3. C
    36.6
  4. D
    93.3
Question 32Single Answer
A short in any type of circuit (series, parallel or combination) causes the total circuit
1. resistance to decrease
2. power to decreases
3. current to increase
Which of the above are correct?
  1. A
    2  and 3 
  2. B
    2 and 4
  3. C
    1 and 4 
  4. D
    1 and 3 
Question 33Single Answer
An air-cored solenoid of 250 turns has a cross-sectional area A = 80 cm2 and length l = 100 cm. The value of its inductance is
  1. A
    0.425 mH          
  2. B
    0.628 mH
  3. C
    0.751 mH 
  4. D
    0.904 mH
Question 34Single Answer
The current in a coil changes uniformly from 10 A to 1 A in half a second. A voltmeter connected across the coil gives a reading of 36 V. The self-inductance of the coil is
  1. A
    0.5 H 
  2. B
    1 H
  3. C
    2 H       
  4. D
    4 H 
Question 35Single Answer
In a mutually coupled circuit, the primary current is reduced from 4A to zero in 10 s.  A voltage of 40000 V is observed across the secondary. The mutual inductance between the coils is
  1. A
    100 H 
  2. B
    10 H
  3. C
    0.1 H 
  4. D
    0.01 H 
Question 36Single Answer
A CRO screen has 10 divisions on the horizontal scale. If a voltage signal 5 sin (314t + 45°) is examined with a line base setting of 5 ms/div, the number of signals displayed on the screen will be 
  1. A
    1.25 cycles           
  2. B
    2.5 cycles 
  3. C
    5 cycles 
  4. D
    10 cycles 
Question 37Single Answer
Which one of the following conditions will be correct when three identical bulbs forming a star are connected to a three-phase balanced supply?
 
  1. A
    The bulb in R phase will be the brightest 
  2. B
    The bulb in Y phase will be the brightest 
  3. C
    The bulb in B phase will be the brightest 
  4. D
    All the bulbs will be equally bright 
Question 38Single Answer
Loading by the measuring instruments introduces an error in the measured parameter. Which of the following devices gives most accurate result?
  1. A
    PMMC
  2. B
    Hot-wire
  3. C
    CRO 
  4. D
    Electrodynamic
Question 39Single Answer
A moving-coil galvanometer can be used as a DC ammeter by connecting
  1. A
    a high resistance in series with the meter
  2. B
    a high resistance across the meter
  3. C
    a low resistance across the meter
  4. D
    a low resistance in series with the meter
Question 40Single Answer
Consider the following types of damping:
1. Air-friction damping
2.Fluid-friction damping
3.Eddy-current damping
PMMC type instruments use which of the above?
  1. A
    1 only   
  2. B
    2 only
  3. C
    3 only 
  4. D
    1,2 and 3
Question 41Single Answer
In data acquisition system, analog data acquisition system is used
  1. A
    for narrow frequency width, while digital data acquisition system is used when wide frequency width is to be monitored
  2. B
    for wide frequency width, while digital data acquisition system is used when narrow frequency width is to be monitored
  3. C
    when quantity to be monitored varies slowly, while its counterpart is preferred if the quantity to be monitored varies very fast
  4. D
    when quantity to be monitored is time-variant, while digital data acquisition system is preferred when quantity is time invariant
Question 42Single Answer
During the measurement of resistance by Carey Foster bridge, no error is introduced due to
1.contact resistance
2. Connecting leads
3.thermoelectric e.m.f.
which of the above 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 43Single Answer
Which of the following is true for the complete response of any network voltage or current variables for a step excitation to a first-order circuit?
  1. A
    It has the form at k1 e-at
  2. B
    It has the form k 
  3. C
    It may have either the form (a) or the form of (a) plus (b) 
  4. D
    It has the form e+at
Question 44Single Answer
A piezoelectric crystal has a coupling coefficient K of 0.32. How much electrical energy must be applied to produce output energy of 7.06 × 10–3 J?
  1. A
    25.38 mJ 
  2. B
    22.19 mJ 
  3. C
    4.80 mJ 
  4. D
    2.26 mJ 
Question 45Single Answer
A wattmeter reads 10 kW, when its current coil is connected in R phase and the potential coil is connected across R and neutral of a balanced 400 V (RYB sequence) supply. The line current is 54 A. If the potential coil reconnected across B-Y phases with the current coil in R phase, the new reading of the wattmeter will be nearly
  1. A
    10 kW 
  2. B
    13 kW
  3. C
    16 kW 
  4. D
    19 kW 
Question 46Single Answer
For a type-I system, the intersection of the initial slope of the Bode plot with 0dB axis gives
  1. A
    steady-state error
  2. B
    error constant
  3. C
    phase margin
  4. D
    cross-over frequency
Question 47Single Answer
The desirable features of a servomotor are
  1. A
    low rotor inertia and low bearing friction
  2. B
    high rotor inertia and high bearing friction.
  3. C
    low rotor inertia and high bearing friction
  4. D
    high rotor inertia low bearing friction
Question 48Single Answer
Permeance is inversely related to
  1. A
    resistance 
  2. B
    conductance
  3. C
    reluctance         
  4. D
    capacitance
Question 49Single Answer
Consider the following statements regarding an ideal core material:
1. It has very high permeability.
2. It loses all its magnetism when there is no current flow.
3. It does not saturate easily.
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 50Single Answer
The characteristic impedance of a transmission line depends upon
  1. A
    shape of the conductor
  2. B
    surface treatment of the conductor
  3. C
    conductivity of the material 
  4. D
    geometric configuration of the conductor
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