Download AppGovt. JobsFree G.K. & Current AffairsScholarshipBlog
Free PracticeContact
📚 Exam by Category
▾
Objective Questions

Latest BHEL Supervisor Trainee Electronics Exam Question (Objective Questions), MCQ in English

Subjects : Electronics, General Knowledge, Reasoning, English

Question Bank BHEL Supervisor Trainee (Electronics) Exam - English
Back to Exam

Electronics

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
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 17Single 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 18Single 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 19Single 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 20Single 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 21Single 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 22Single 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 23Single Answer
Permeance is inversely related to
  1. A
    resistance 
  2. B
    conductance
  3. C
    reluctance         
  4. D
    capacitance
Question 24Single 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 25Single 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
Question 26Single 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 27Single 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 28Single 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 29Single 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 30Single 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 31Single 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 32Single 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 33Single 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 34Single 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 35Single 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 36Single 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 37Single 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 38Single 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 39Single 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 40Single 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 41Single 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 42Single 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 43Single 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 44Single 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 45Single 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 46Single Answer
For a 3-phase induction motor, what fraction/ multiple of supply voltage is required for a direct-on-line starting method such that starting current is limited to 5 times the full-load current and motor develops 1-5 times full-load torque at starting time?
  1. A
    1.632 
  2. B
    1.226
  3. C
    0.816 
  4. D
    0.456
Question 47Single Answer
What is the material of slip-rings in an induction machine?
  1. A
    Carbon 
  2. B
    Nickel
  3. C
    Phosphor bronze 
  4. D
    Manganese
Question 48Single Answer
The stator loss of a 3-phase induction motor is 2 kW. If the motor is running with a slip of 4% and power input of 90 kW, then what is the rotor mechanical power developed?
  1. A
    84.48 kW 
  2. B
    86.35 kW
  3. C
    89.72 kW 
  4. D
    90.52 kW 
Question 49Single Answer
In a single-phase capacitor-start induction motor, the direction of rotation
  1. A
    can be changed by reversing the main winding terminals
  2. B
    cannot be changed
  3. C
    is dependent on the size of the capacitor
  4. D
    can be changed only in large capacity motors.
Question 50Single Answer
A transformer may have negative voltage regulation if the load power factor (p.f.) is
  1. A
    Leading for some values of p.f.
  2. B
    Unity p.f.
  3. C
    Lagging but not zero p.f.
  4. D
    Only zero p.f. lag
Important Questions Package

BHEL Supervisor Trainee Electronics Exam Online Question Bank Package

Buy BHEL Supervisor Trainee Electronics Important Questions, MCQ, question answer in Hindi & English. It will help you to score high marks in BHEL Supervisor Trainee Electronics question bank 2026 in Online, PDF & Print study material.

+ Free Monthly Current Affairs, GK & more PDF Download
Sr.Package NameAmount
1.BHEL Supervisor Trainee (Electronics) Exam - Hindi
Description : 1000 Question With Answer
₹101 [₹500]
2.BHEL Supervisor Trainee (Electronics) Exam - Hindi
Description : 2000 Question With Answer
₹151 [₹500]
3.BHEL Supervisor Trainee (Electronics) Exam - English
Description : 1000 Question With Answer
₹101 [₹500]
4.BHEL Supervisor Trainee (Electronics) Exam - English
Description : 2000 Question With Answer
₹151 [₹500]
5.BHEL Supervisor Trainee (Electronics) Exam - Hindi
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹101 [₹450]
6.BHEL Supervisor Trainee (Electronics) Exam - English
Description : 1000 Question & Answer Download in PDF (Send by Email)
₹101 [₹450]
7.BHEL Supervisor Trainee (Electronics) Exam Question Bank Book - Hindi
Description : 1000 Question with Answer (Printed Material)
₹450 [₹800]
8.BHEL Supervisor Trainee (Electronics) Exam Question Bank Book - English
Description : 1000 Question with Answer (Printed Material)
₹390 [₹600]
Back to Exam