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Latest BEL Deputy Engineer Exam Question (Objective Questions), MCQ in English

Subjects : General Awareness, Mechanical

Question Bank BEL Deputy Engineer Exam (Mechanical) - English
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General Awareness

Question 1Single 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 2Single 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 3Single 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 4Single 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 5Single 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 6Single Answer
I go to Madurai by —– Vaigai Express
  1. A
    a
  2. B
    an
  3. C
    some
  4. D
    the
Question 7Single Answer
Have the car stolen!
  1. A
    Steal the car
  2. B
    You should have the stolen car
  3. C
    Get someone to steal the car
  4. D
    They have stolen the car
Question 8Single Answer
How many such pairs of letters are there in the word ‘CLEANLINESS’ each of the which has as many letters between them in the word as they have in the English alphabet, in the same sequence?
  1. A
    Two
  2. B
    Three
  3. C
    Five
  4. D
    Four
  5. E
    None of these
Question 9Single Answer
Team A has scored more goals than Team B
Team C has scored fewer goals than Team B
Team A has scored fewer goals than Team C .
If the first two statements are true, the third statement is
  1. A
    True
  2. B
    False
  3. C
    Uncertain
  4. D
    None
Question 10Single Answer
If it is possible to make only one meaningful word with the second, the third, the sixth and the eight letters of the word FRAGMENT using each only once, which of the following will be the third letter of that word ? If no such word can be formed, give ‘X’ as the answer and if more than one such word can be formed, give ‘Y’ as the answer.
  1. A
    A
  2. B
    E
  3. C
    T
  4. D
    X
  5. E
    Y
Question 11Single Answer
The cash difference between the selling prices of an article at a profit of 4% and 6% is Rs. 3. The ratio of the two selling prices is:__________ ?
  1. A
    51:52
  2. B
    52:53
  3. C
    51:53
  4. D
    52:55
Question 12Single Answer
Which of the following numbers is irrational ?
  1. A
    √49
  2. B
    0.125
  3. C
    √2
  4. D
    22/7
Question 13Single Answer
356 x 936 – 356 x 836 = ?
  1. A
    35600  
  2. B
    34500
  3. C
    9630
  4. D
    93600
Question 14Single Answer
The Indian Navy recently received its second indigenous Diving Support Vessel (DSV). What is its name?
  1. A
    Nistar
  2. B
    Nipun
  3. C
    INS Vikrant
  4. D
    INS Arihant
Question 15Single Answer
The Public Examinations (Prevention of Unfair Means) Amendment Bill, 2026, was passed by the Rajya Sabha on which date?
  1. A
    27 July 2026
  2. B
    29 July 2026
  3. C
    31 July 2026
  4. D
    30 July 2026

Mechanical

Question 16Single Answer
Which of the following is the unit of kinematic viscosity _________________?
  1. A
    Pascal
  2. B
    Poise
  3. C
    Stoke
  4. D
    Faraday
  5. E
    None of the above
Question 17Single Answer
Consider the following processes:
1. Extension of a spring
2. Plastic deformation of a material
3. Magnetization of a material exhibiting hysteresis
Which of the above process are irreversible?
  1. A
    1 and 2 only            
  2. B
    1 and 3 only
  3. C
    1 only                        
  4. D
    1, 2 and 3
Question 18Single Answer
Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity
  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 19Single Answer
A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is
  1. A
    10 kW      
  2. B
    20 kW
  3. C
    30 kW    
  4. D
    50 kW
Question 20Single Answer
A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly
  1. A
    18%                        
  2. B
    23%
  3. C
    26%                        
  4. D
    30%
Question 21Single Answer
One reversible heat engine operates between 1000 K and T2 K and another reversible heat engine operates between T2K and 400 K. If both the engines have the same heat input and output, then the temperature T2 must be equal to
  1. A
    582.7 K                   
  2. B
    632.5 K
  3. C
    682.8 K                   
  4. D
    732.5 K
Question 22Single Answer
Consider the following statements for isothermal process:
1. Change in internal energy is zero
2. Heat transfer is zero
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 23Single Answer
A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. The process is:
  1. A
    Reversible and isothermal
  2. B
    Irreversible
  3. C
    Reversible only
  4. D
    Isothermal only
Question 24Single Answer
Which one of the following statements is correct during adiabatic charging of an ideal gas into an empty cylinder from a supply main?
  1. A
    The specific enthalpy of the gas in the supply main is equal to the specific enthalpy of the gas in the cylinder
  2. B
    The specific enthalpy of the gas in the supply main is equal to the specific internal energy of the gas in the cylinder
  3. C
    The specific internal energy of the gas in the supply main is equal to the specific enthalpy of the gas in the cylinder
  4. D
    The specific internal energy of the gas in the supply main is equal to the specific internal energy of the gas in the cylinder
Question 25Single Answer
Consider the following systems :
1. An electric heater
2. A gas turbine
3. A reciprocating compressor
The steady flow energy equation can be applied to which of the above systems?
  1. A
    1 and 2 only            
  2. B
    1 and 3 only
  3. C
    1, 2 and 3                
  4. D
    2 and 3 only
Question 26Single Answer
Consider the following motions :
1. Piston reciprocating inside an engine cylinder
2. Motion of a shaft between foot-step bearings
Which of the above can rightly be considered as successfully constrained motion?
  1. A
    1 only                     
  2. B
    2 only
  3. C
    Both 1 and 2           
  4. D
    Neither 1 nor 2
Question 27Single Answer
A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which leaves the shaft balanced statically.The dynamic reactions at the supports will be
  1. A
    800 N and 800 N
  2. B
    300 N and 800 N
  3. C
    800 N and – 300 N
  4. D
    300 N and – 300 N
Question 28Single Answer
A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?
  1. A
    Simple harmonic
  2. B
    Constant acceleration and deceleration
  3. C
    Constant velocity
  4. D
    Cycloidal
Question 29Single Answer
In a circular are cam with a roller follower, acceleration of the follower depends on
1. cam speed and location of centre of circular arc
2. roller diameter and radius of circular arc
Which of the above is/are correct?
  1. A
    1 only                     
  2. B
    2 only
  3. C
    Both 1 and 2           
  4. D
    Neither 1 nor 2
Question 30Single Answer
A manufacturing company is selling a product for 15 per unit with variable cost of  10 per unit. The fixed cost of the asset is 50,000. How many units should be produced to breakeven?
  1. A
    2000                       
  2. B
    5000
  3. C
    8000                       
  4. D
    10000
Question 31Single Answer
Hot wire anemometer is used to measure_______________?
  1. A
    discharge            
  2. B
    velocity of gas
  3. C
    pressure intensity of gas
  4. D
    pressure intensity of liquid
Question 32Single Answer
A gear of 28 cm pitch circle diameter has 40 teeth. The circular pitch will nearly be
  1. A
    11 mm/tooth            
  2. B
    22 mm/tooth
  3. C
    33 mm/tooth            
  4. D
    44 mm/tooth
Question 33Single Answer
Consider the following statements regarding gear tooth designing for gear drive :
1. Tooth profiles not designed as per ‘law of gearing’ will cause vibration and impact problems even at low speed.
2. As the gears go through their mesh, the pitch point must remain stationary on the line of centres.
3. In a correctly designed tooth profile, the line of action of successive instantaneous points of contact will pass through the stationary pitch point.
Which of the above statements are correct?
  1. A
    1, 2 and 3                
  2. B
    1 and 2 only
  3. C
    1 and 3 only                        
  4. D
    2 and 3 only
Question 34Single Answer
The flywheel of a steam engine has a radius of gyration of 1 m and mass 2000 kg. The starting torque of the engine is 2000 N-m. The kinetic energy of the flywheel after 10 seconds from start is
  1. A
    75 kN-m                  
  2. B
    100 kN-m
  3. C
    125 kN-m                 
  4. D
    150 kN-m
Question 35Single Answer
Consider two shafts connected with two gears as per the following options :
1. One on each shaft.
2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only.
3. Through an intermediate gear mounted on an intermediate shaft having two gears, whereas the other shafts have one gear each
Which of the above represent(s) a simple gear train?
  1. A
    1 only                     
  2. B
    1 and 2 only
  3. C
    2 and 3 only                        
  4. D
    1, 2 and 3
Question 36Single Answer
A spherical waterdrop of 1 mm in diameter splits up in air into 64 smaller drops of equal size. The surface tension coefficient of water in air is 0.073 N/m. The work required in splitting up the drop is
  1. A
    0.96 × 10–6 J            
  2. B
    0.69 × 10–6 J
  3. C
    0.32 × 10–6 J            
  4. D
    0.23 × 10–6 J
Question 37Single Answer
Consider the following statements pertaining to stability of floating bodies:
1. A floating body will be stable when the centre of gravity is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.
Which of the above statements are correct?
  1. A
    1, 2 and 3                
  2. B
    1 and 2 only
  3. C
    1 and 3 only                        
  4. D
    2 and 3 only
Question 38Single Answer
Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Assuming steady inviscid flow, constant pressure atmosphere everywhere, and neglecting curvature and surface tension effects, the diameter of the stream 0.5 m below the tap opening is nearly
  1. A
    11.7 mm                  
  2. B
    14.6 mm
  3. C
    17.5 mm                  
  4. D
    20.4 mm
Question 39Single Answer
Consider the following statements:
1. At low Reynolds numbers of any flow, viscous forces dominate over inertial forces.
2. Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow.
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 40Single Answer
In a steady laminar flow of a given discharge through a circular pipe of diameter D, the head loss is proportional to
  1. A
    D–1                          
  2. B
    D–2
  3. C
    D–3                          
  4. D
    D–4
Question 41Single Answer
The centre-line velocity in a pipe flow is 2m/s. What is the average flow velocity in the pipe if the Reynolds number of the flow is 800?
  1. A
    2 m/s                       
  2. B
    1.5 m/s
  3. C
    1 m/s                      
  4. D
    0.5 m/s
Question 42Single Answer
During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is
  1. A
    8%                          
  2. B
    10%
  3. C
    12%                        
  4. D
    15%
Question 43Single Answer
A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/kg K to 75 kJ/kg K. The process is
  1. A
    reversible and isothermal
  2. B
    irreversible
  3. C
    reversible only
  4. D
    isothermal only
Question 44Single Answer
A reversible heat engine rejects 80% of the heat supplied during a cycle of operation. If the engine is reversed and operates as a refrigerator, then its coefficient of performance shall be
  1. A
    6                             
  2. B
    5
  3. C
    4                             
  4. D
    3
Question 45Single Answer
For the same efficiency of the Brayton cycle and the Carnot cycle working between temperature limits of Tmax and Tmin, the power contribution of the Brayton cycle will be
  1. A
    zero            
  2. B
    maximum
  3. C
    minimum
  4. D
    50% of the Carnot cycle
Question 46Single Answer
A fin will be more effective when Bio number is
  1. A
    Greater than 1
  2. B
    Equal to 1
  3. C
    Between 1 and 3
                   4        4
  4. D
    Less than 1
Question 47Single Answer
A tank of length, breadth and height in the ratio of 2:1:2 is full of water. The ratio of hydrostatic force at the bottom to that at any larger vertical surface is
  1. A
    1
  2. B
    2
  3. C
    3
  4. D
    4
Question 48Single Answer
Which of the following fluids exhibit a certain shear stress at zero shear strain rate followed by a straight line relationship between shear stress and shear strain rate?
  1. A
    Newtonian fluid 
  2. B
    Ideal Bingham plastic fluids
  3. C
    Pseudo-plastic fluids
  4. D
    Dilatent fluids
Question 49Single Answer
What is the specific gravity of a marble stone, which weighs 400N in air, and 200N in water? (g=10m/s2)
  1. A
    8
  2. B
    6
  3. C
    4
  4. D
    2
Question 50Single Answer
What is the intensity of pressure in the following SI units, when specific gravity of mercury is 13.6 and the intensity of pressure is 400KPa ?
  1. A
    0.3 bar or 4.077m of water or 0.29 mm of Hg
  2. B
    4 bar or 5.077m of water or 0.399 mm of Hg
  3. C
    0.3 bar or 5.077m of water or 0.599 mm of Hg
  4. D
    4 bar or 4.077m of water or 0.299 mm of Hg
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