Heating and Welding Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.   Which of the following is an advantage of heating by electricity ?
(a)     Quicker operation
(b)     Higher efficiency
(c)    Absence of flue gases
(d)    All of the above
Ans: d

2.   ________ has the highest value of thermal conductivity.
(a) Copper   
(b) Aluminium
(c) Brass   
(d) Steel
Ans: a

3. Which of the following heating methods has maximum power factor ?
(a)    Arc heating
(b)    Dielectric heating
(c)    Induction heating
(d)    Resistance heating
Ans: d

4    method has leading power factor
(a)     Resistance heating
(b)     Dielectric heating
(c)    Arc heating
(d)    Induction heating
Ans: b

5    is used for heating non-conducting materials.
(a)     Eddy current heating
(b)     Arc heating
(c)    Induction heating
(d)    Dielectric heating
Ans: d

6.    Which of the following methods of heating is not dependent on the frequency of supply ?
(a)     Induction heating
(b)     Dielectric heating
(c)    Electric resistance heating
(d)    All of the above
Ans: c

7.    When a body reflects entire radiation incident on it, then it is known as
(a)     white body       
(b)     grey body
(c)    black body
(d)    transparent body
Ans: a

8.    For the transmission of heat from one body to another
(a)     temperature of the two bodies must be different
(b)     both bodies must be solids
(c)    both bodies must be in contact
(d)    at least one of the bodies must have some source of heating
Ans: a

9.    Heat transfer by condition will not occur when
(a)     bodies are kept in vacuum
(b)     bodies are immersed in water
(c)    bodies are exposed to thermal radiations
(d)    temperatures of the two bodies are identical
Ans: d

10.    A perfect black body is one that
(a)     transmits all incident radiations
(b)     absorbs all incident radiations
(c)    reflects all incident radiations
(d)    absorbs, reflects and transmits all incident radiations
Ans: b

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Industrial Drives Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    The selection of an electric motor for any application depends on which of the following factors ?
(a)    Electrical characteristics
(b)    Mechanical characteristics
(c)    Size and rating of motors
(d)    Cost
(e)    All of the above
Ans: e

2.    For a particular application the type of electric-and control gear are determined by which of the following considerations ?
(a)    Starting torque
(b)    Conditions of environment
(c)    Limitation on starting current
(d)    Speed control range and its nature
(e)    All of the above
Ans: e

3.    Which ofthefollowingmotors is preferred for traction work ?
(a)     Universal motor
(b)     D.C. series motor
(c)    Synchronous motor
(d)    Three-phase induction motor
Ans:

4   Which of the following motors always starts on load ?
(a)     Conveyor motor
(b)     Floor mill motor
(c)    Fan motor
(d)    All of the above
Ans: d

5    is preferred for automatic drives.
(a)     Squirrel cage induction motor
(b)     Synchronous motors
(c)    Ward-Leonard controlled D.C. motors
(d)    Any of the above
Ans: c

6. When the load is above _____ a synchronous motor is found to be more economical.
(a)     2 kW   
(b)     20 kW
(c)     50 kW   
(d)     100 kW
 Ans: d

7.    The load cycle for a motor driving a power press will be   
(a)     variable load
(b)     continuous
(c)    continuous but periodical
(d)    intermittent and variable load
Ans: d

8.    Light duty cranes are used in which of the following ?
(a)     Power houses
(b)     Pumping stations
(c)    Automobile workshops
(d)    All of the above
Ans: d

9.    While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
(a)    Running characteristics
(b)    Starting characteristics
(c)    Efficiency
(d)    Braking
Ans: d

10.   Which of the following motors are pre-ferred for overhead travelling cranes ?
(a)    Slow speed motors
(b)    Continuous duty motors
(c)    Short time rated motors
(d)    None of the above
Ans: c

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Electric Traction Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    Which of the following is an advantage of electric traction over other methods of traction ?
(a)    Faster acceleration
(b)    No pollution problems   
(c)    Better braking action
(d)    All of the above
Ans: a
2.    Which of the following is the voltage for single phase A.C. system ?
(a)    22 V   
(b)    440 V
(c)    5 kV   
(d)    15 kV
(e)    None of the above
Ans: a

3.    Long distance railways use which of the    following ?
(a)    200 V D.C.
(b)    25 kV single phase A.C.    10.
(c)    25 kV two phase A.C.
(d)    25 kV three phase A.C.
Ans: b
4.    The speed of a locomotive is controlled by
(a)     flywheel   
(b)     gear box
(c)    applying brakes    11.
(d)    regulating steam flow to engine
Ans: b

5.    Main traction systems used in India are, those using
(a)    electric locomotives
(b)    diesel engine locomotives
(c)    steam engine locomotives
(d)    diesel electric locomotives
(e)    all of the above
 Ans: e

6, in India diesel locomotives are manu¬factured at
(a) Ajmer   
(b) Varanasi
(c) Bangalore   
(d) Jamalpur
Ans: b

7. For diesel locomotives the range of horsepower is
(a) 50 to 200   
(b) 500 to 1000
(c) 1500 to 2500     
(d) 3000 to 5000
Ans: c

8. _______ locomotive has the highest operational availability.
(a)    Electric   
(b)    Diesel
(c)    Steam
Ans: a

9. The horsepower of steam locomotives is
(a)      upto 1500   
(b)     1500 to 2000
(c)      2000 to 3000     
(d)     3000 to 4000
Ans: a

10. The overall efficiency of steam locomo¬tive is around
(a)    5 to 10 percent
(b)    15 to 20 percent
(c)    25 to 35 percent
(d)    35 to 45 percent
Ans: a

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Control Systems Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    In an open loop control system
(a)    Output is independent of control input
(b)    Output is dependent on control input
(c)    Only system parameters have effect on the control output
(d)    None of the above
Ans: a

2.    For open control system which of the following statements is incorrect ?
(a)     Less expensive
(b)     Recalibration is not required for maintaining the required quality of the output
(c)    Construction is simple and maintenance easy
(d)    Errors are caused by disturbances
Ans: b

3.    A control system in which the control action is somehow dependent on the output is known as
(a)     Closed loop system
(b)     Semiclosed loop system
(c)     Open system
(d)     None of the above
Ans: a

4.    In closed loop control system, with positive value of feedback gain the overall gain of the system will
(a)    decrease   
(b)     increase
(c)     be unaffected    
(d)     any of the above
Ans: a

5.    Which of the following is an open loop control system ?
(a)     Field controlled D.C. motor
(b)    Ward leonard control
(c)    Metadyne   
(d)     Stroboscope
Ans: a

6.    Which of the following statements is not necessarily correct for open control system ?
(a)     Input command is the sole factor responsible for providing the control action
(b)     Presence of non-linearities causes malfunctioning
(c)    Less expensive
(d)    Generally free from problems of non-linearities
Ans: b

7.   In open loop system
(a)    the control action depends on the size of the system
(b)    the control action depends on system variables
(c)    the control action depends on the input signal
(d)    the control action is independent of the output
Ans: d

8    has tendency to oscillate.
(a)    Open loop system
(b)    Closed loop system
(c)    Both (a) and (b)
(d)    Neither (a) nor (b)
Ans: b

9.   A good control system has all the following features except
(a)     good stability   
(b)     slow response
(c)    good accuracy
(d)    sufficient power handling capacity
Ans: b

10.    A car is rtyining at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
(a)     Clutch   
(b)     Eyes
(c)    Needle of the speedometer
(d)    Steering wheel
(e)    None of the above
Ans: c

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Measurement and Instrumentation Multiple Choice Questions and Answers Preparation for Competition exams pdf

1. The use of _____ instruments is merely confined within laboratories as stand¬ardizing instruments.
(a)     absolute   
(b)     indicating
(c)     recording
(d)     integrating
(e)     none of the above
Ans: a

2. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
(a)    Absolute instruments
(b)    Indicating instruments
(c)    Recording instruments
(d)    Integrating instruments
Ans: b

3. _____ instruments are those which measure the total quantity of electricity delivered in a particular time.
(a)     Absolute   
(b)     Indicating
(c)     Recording   
(d)     Integrating
Ans: d

4.    Which of the following are integrating instruments ?
(a)     Ammeters   
(b)     Voltmeters
(c)    Wattmeters
(d)    Ampere-hour and watt-hour meters
Ans: d

5.    Resistances can be measured with the help of
(a)     wattmeters      
(b)     voltmeters
(c)    ammeters
(d)    ohmmeters and resistance bridges
(e)    all of the above
Ans: d

6   According to application, instruments are classified as
(a)     switch board    
(b)     portable
(c)     both (a) and (b)
(d)     moving coil
(e)     moving iron     
(f)     both (d) and (e)
Ans: c

7.    Which of the following essential features is possessed by an indicating instrument ?
(a)     Deflecting device
(b)     Controlling device
(c)    Damping device
(d)    All of the above
Ans: d

8.    A _____    device prevents the oscillation of the moving system and enables the latter to reach its final position quickly
(a)     deflecting   
(b)     controlling
(c)     damping   
(d)     any of the above
Ans: c

9.    The spring material used in a spring control device should have the following property.
(a)     Should be non-magnetic
(b)     Most be of low temperature co-efficient
(c)     Should have low specific resistance
(d)     Should not be subjected to fatigue
(e)     All of the above
Ans: e

10.    Which of the following properties a damping oil must possess ?
(a)    Must be a good insulator
(b)    Should be non-evaporating
(c)    Should not have corrosive action upon the metal of the vane
(d)    The viscosity of the oil should not change with the temperature
(e)    All of the above
Ans: e

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Electrical Machine Design Multiple Choice Questions and Answers Preparation for Competition exams pdf

1. Which of the following is the major consideration to evolve a good design ?
(a)     Cost   
(b)     Durability
(c)    Compliance with performance criteria as laid down in specifications
(d)    All of the above
Ans: d
2    impose limitation on design.
(a)    Saturation
(b)    Temperature rise
(c)    Efficiency   
(d)     Power factor
(e)    All above
Ans: e

3.    The efficiency of a machine should be as ______    as possible to reduce the operating cost.
(a)     high   
(b)     low
(c)    either of the above
(d)    none of the above
Ans: a

4.    If an insulating material is operated beyond the maximum allowable temperature, its life is
(a)     drastically increased
(b)     drastically reduced
(c)      unaffected
(d)      none of the above
Ans: b

5.    The design of mechanical parts is particularly important in case of _____ speed machines.
(a)    low   
(b)    medium
(c)    high   
(d)    any of the above
Ans: c

6.    In induction motors, the length of air gap in kept as small as mechanically possible is order to have
(a)     low power factor
(b)     high power factor
(c)    high over load capacity
(d)    any of the above
Ans: b

7.    In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
(a)     small   
(b)     medium
(c)     large   
(d)     any of the above.
Ans: c

8.    The length cf air gap to be provided in ______ is primarily determined by power factor consideration.
(a)     d.c. series motor .
(b)     d.c. shunt motor
(c)     induction motor
(d)    synchronous motor
Ans: c

9.   Electrical machines having a power output upto about 750 W may be called_______machines.
(a)    small size   
(b)    medium size
(c)    large size   
(d)    any of the above
Ans: a

10.    Electrical machines having power outputs ranging from a few kW upto approximately 250 kW may be classified as   
(a)     small size machines
(b)     medium size machines
(c)    large size machines
(d)    any ofthe above
Ans: b

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Electrical Engineering Materials Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    The converse of hardness is known as
(a)     malleability     
(b)     toughness
(c)    softness
(d)    none of the above
Ans: c

2.    On which of the following factors does the resistivity of a material depend ?
(a)    Resistance of the conductor
(b)    Area of the conductor section
(c)    Length of the conductor
(d)    All of the above
Ans: d

3.     is a negatively charged particle present in an atom.
(a)     Proton   
(b)     Neutron
(c)    Electron
(d)    None of the above
Ans: c

4.    The formula ____ determines the number of electrons that can be accommodated in any level.
(a)     2n2   
(6)     4n2
(c)     2n3   
(d)     4ns
Ans: a

5.    The tiny block formed by the arrangement of a small group of atoms is called the
(a)     unit cell   
(b)     space lattice
(c)    either (a) or (b)
(d)    none of the above
Ans: a
6.   The co-ordination number of a simple cubic structure is
(a)     2   
(b)     4
(c)     6   
(d)     8
Ans: c

7.   The covalent bond is formed by
(a)     transfer of electrons between atoms
(b)     sharing of electrons between atoms
(e)     sharing of variable number of electrons by a variable number of atoms
(d)     none of the above
 Ans: b

8.    A perfect conductor has
(a)     zero conductivity
(b)     unity conductivity
(c)    infinite conductivity
(d)    none of the above
Ans: c

9.    The metal having the lowest temperature coefficient of resistance is
(a)     gold   
(b)     copper
(c)     aluminium   
(d)     kanthal
Ans: a

10.    Commonly used conducting materials are
(a)     copper   
(b)     aluminium
(c)    both (a) and (b)
(d)    copper and silver
(e)    platinum and gold
Ans: c

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