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Objective Questions

Latest DSSSB JE Exam Question (Objective Questions), MCQ in English

Subjects : Electrical, English Language & Comprehension

Question Bank DSSSB JE Exam TIER 2 (Electrical) - English
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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 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 7Single 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 8Single 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 9Single 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 10Single 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 11Single 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 12Single 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 13Single 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 14Single 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 15Single 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 16Single 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 17Single 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 18Single 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 19Single 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 20Single 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 21Single Answer
A clamper circuit
1. Adds or subtracts a dc voltage to or from a waveform
2. Does not change the shape of the waveform
Which of the above statements are correct? 
  1. A
    1 only 
  2. B
    2 only 
  3. C
    Both 1 and 2 
  4. D
    Neither 1 nor 2 
Question 22Single Answer
If a carrier of 100% modulated AM is suppressed before transmission, the power saving is nearly
  1. A
    50% 
  2. B
    67%
  3. C
    100% 
  4. D
    125%
Question 23Single Answer
When the modulating frequency is doubled the modulation index is halved and the modulating voltage remains constant. This happens when the modulating system is
  1. A
    AM 
  2. B
    PM
  3. C
    FM       
  4. D
    Delta Modulation
Question 24Single Answer
The four basic elements in a PLL are loop filter, loop amplifier, VCO and
  1. A
    Up converter
  2. B
    Down converter
  3. C
    Phase detector
  4. D
    Frequency multiplier
Question 25Single Answer
In a frequency modulated (FM) system, when the audio frequency is 500 Hz and audio frequency voltage is 2.4 V, the frequency deviation is 4.8 kHz. If the audio frequency voltage is now increased to 7.2 V then what is the new value of deviation?
  1. A
    0.6 kHz 
  2. B
    3.6 kHz
  3. C
    12.4 kHz 
  4. D
    14.4 kHz
Question 26Single Answer
In an IGBT cell the collector and emitter are respectively
  1. A
    n and p
  2. B
    n+ and p+
  3. C
    p and n
  4. D
    p+ and n+
Question 27Single Answer
The main units in a pulse code modulator are:
1. Sampler
2. Quantiser
3. Encoder
4. Comparator
  1. A
    1 and 2 only
  2. B
    2 and 3 only
  3. C
    1, 2 and 3 only
  4. D
    2 and 4 only
Question 28Single Answer
NAND and NOR gates are called ‘Universal’ gates primarily because
  1. A
    They are available everywhere
  2. B
    They are widely used in I.C. packages
  3. C
    They can be combined to produce AND, OR and NOR gate
  4. D
    They can be manufactured easily
Question 29Single Answer
To turn-off a GTO what is required at the gate?
  1. A
    A high amplitude (but low energy) negative current
  2. B
    A low amplitude negative current
  3. C
    A high amplitude negative voltage
  4. D
    A low amplitude negative voltage
Question 30Single Answer
In a power transformer, the core loss is 50 W at 40 Hz and 100 W at 60 Hz, under the condition of same maximum flux density in both cases. The core loss at 50 Hz will be
  1. A
    64 W
  2. B
    73 W
  3. C
    82 W 
  4. D
    91 W 
Question 31Single Answer
Consider the following advantages of a distributed winding in a rotating machine:
1. Better utilization of core as a number of evenly placed small slots are used
2. Improved waveform as harmonic emf’s are reduced
3. Diminished armature reaction and efficient cooling
Which of the above advantages 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 32Single Answer
The breadth factor for 3rd harmonic emf of a 3-phase, 4-pole, synchronous machine having 36 stator slots is
  1. A
    0.47 
  2. B
    0.53
  3. C
    0.67 
  4. D
    0.73
Question 33Single Answer
Consider the following factors for a dc machine:
1. Interpole
2. Armature resistance
3. Reduction in field current
Which of the above factors are responsible for decrease in terminal voltage of a shunt generator?
  1. A
    1 and 2 only 
  2. B
    2 and 3 only
  3. C
    1 and 3 only 
  4. D
    1, 2 and 3
Question 34Single Answer
A dc motor develops an electromagnetic torque of 150 N-m in a certain operating condition. From this operating condition, a 10% reduction in field flux and 50% increase in armature current is made. What will be new value of electromagnetic torque? 
  1. A
    225 N-m 
  2. B
    202.5 N-m
  3. C
    22.5 N-m 
  4. D
    20.25 N-m
Question 35Single Answer
If the capacitor of a capacitor-start single-phase motor fails to open when the motor picks up speed, 
  1. A
    The motor will stop
  2. B
    The auxiliary winding will be damaged
  3. C
    The capacitor will be damaged
  4. D
    The winding will be damaged
Question 36Single 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 37Single 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 38Single 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 39Single 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 40Single 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 41Single Answer
What is the correct sequence of the following materials in ascending order of their resistivity ?
1. Iron
2. Silver
3. Constantan
4. Mica
5. Aluminium
Select the correct answer using the codes given below : 
  1. A
    2, 5, 1, 3 and 4 
  2. B
    4, 5, 3, 1 and 2 
  3. C
    2, 3, 1, 5 and 4 
  4. D
    4, 5, 1, 3 and 2
Question 42Single Answer
In the first Cauer network, with a pole at infinity, the first element must be
  1. A
    Series capacitor 
  2. B
    Series inductor 
  3. C
    Shunt capacitor 
  4. D
    Shunt inductor
Question 43Single Answer
The total magnetic moment
1. is called saturation magnetization.
2. depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop.
Which of the above statements is/are correct ? 
  1. A
    1 only 
  2. B
    2 only 
  3. C
    Both 1 and 2 
  4. D
    Neither 1 nor 2
Question 44Single Answer
Susceptibility of a diamagnetic material is 1. Negative
2. Positive
3. Dependent on the temperature
4. Independent of the temperature 
  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 45Single Answer
Superconductivity is a material property associated with 
  1. A
    Changing shape by stretching 
  2. B
    Stretching without breaking 
  3. C
    A loss of thermal resistance 
  4. D
    A loss of electrical resistance
Question 46Single Answer
An atom in a crystal vibrates at a frequency, determined by
1. Crystal heat current
2. Crystal temperature
3. The stiffness of the bonds with neighbour atoms
Select the correct answer using the codes given below: 
  1. A
    1 only 
  2. B
    2 only 
  3. C
    3 only
  4. D
    1, 2 and 3
Question 47Single Answer
Consider the following statements:
1. Nano means 10–9 so that nano materials have an order of dimension higher than the size of atom and come in the form of rods, tubes, spheres or even thin sheets/films
2. Nano materials have enhanced of changed structural property
3. Nano elements lend themselves to mechanical processing like rolling, twisting, positioning
4. Nano elements show important electrical, magnetic and optical characteristics that are useful in electrical industry
Which of the above statements are correct? 
  1. A
    1, 2 and 3 only 
  2. B
    1, 2, 3 and 4 
  3. C
    3 and 4 only
  4. D
    1, 2 and 4 only
Question 48Single Answer
For a two-part reciprocal network, the three transmission parameters are A = 4, B = 7 and C = 5. What is the value of D? 
  1. A
    9.5 
  2. B
    9.0 
  3. C
    8.5 
  4. D
    8.0
Question 49Single Answer
Consider the following as representations of reciprocity in terms of z-parameters:
1. z11 = z12                     2. z12 = z22
3. z12 = z21
Which of the above representations is/are correct? 
  1. A
    1 only 
  2. B
    2 only 
  3. C
    3 only 
  4. D
    1, 2 and 3
Question 50Single Answer
Kirchhoff’s current law is applicable to
1. Closed loops in a circuit
2. Junction in a circuit
3. Magnetic circuits
Which of the above is/are correct? 
  1. A
    1 only 
  2. B
    2 only 
  3. C
    3 only 
  4. D
    1, 2 and 3
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