Steel Authority Of India Limited SAIL Model Questions Electrical Engineering Questions

Steel Authority Of India Limited

SAIL Model Questions

Electrical Engineering Questions

Q. Which of the following device is used in transformer?

• Tube light
• Electric heater
• Mobile phone
• Rectifier module

Q. Earth electrodes can be in the form of

• rods or piper
• stripes
• plates
• any of above

Q. Carbon or metal brushes are used in

• DC generators only
• AC generators only
• Both AC & DC generation
• None of above

Q. Energy is lost due to Joule's heating effects in winding of transformer. This is called

• Copper loss
• Eddy current loss
• Flux loss
• None

Q. In refrigeration cycle heat is lost in

• Cooling coil
• Condenser
• Compressor
• Expansion valve

Q. The power factor of AC circuit is

• R/X
• R/Z
• Z/R
• Zero

Q. Silicon controlled output is good if ripple factor is

• Switch
• Transformer
• Amplifier
• None of above

Q. The rectifier output is good if ripple factor is\

• More
• Less
• Constant
• None of above

Q. Protective relays can monitor large AC current by means of

• Current transformer
• Potential transformer
• Micro transformer
• None of above

Q. The combines AM of two similar batteries connected in parallel is:

• halved
• doubled
• remain constant
• none of above

Q. The current in circuit having 5 V EMI source and 10 Ohm resistance is:

• 2 Amp
• 50 Amp
• 5 Amp
• ½ Amp

Q. The chopper is a device to change

• Voltage
• Current
• Frequency
• None of these

Q. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is proportional to:

• speed
• square of speed
• cube of speed
• none of these

Q. Which of these need to be measured after rewinding the motor:

• no load current
• air gap
• winding resistance
• all of the above

Q. Five percent increase in supply frequency will change the synchronous speed of motor by:

• -5%
• +5%
• -10%
• +10%

Q. Which of the following is the best inverter?

• square wave inverter
• sine wave inverter
• pure sine wave inverter
• triangular wave inverter

Q. For driving a motor in a tape recorder or record player, the motor used is generally:

• a synchronous motor
• a hydraulic motor
• an induction motor
• a dc series motor

Q. The DC motor starter used with a constant speed shunt motor is:

• 2 point starter
• 3 point starter
• 4 point starter
• 5 point starter

Q. A commutator in a DC motor converts

• AC to DC
• DC to AC
• Both AC to DC and DC to AC
• None of these

Q. Two transformers running in parallel will share the load according to their:

• leakage reactance
• pu impedance
• efficiency
• rating

Q. The size of the Earth Wire is determined by:

• the ampere capacity of the service wires
• the atmospheric conditions
• the voltage of service wires
• none of these

Q. The function of lightning arrester is:

• to limit the short circuit fault current
• to provide path to high voltage surge to earth
• to reduce arcing
• none of these

Q. Surge protector provide:

• high impedance to normal voltage
• low impedance to surge
• both (a) and (b)
• none of these

Q. Earthing is necessary to give protection against

• voltage fluctuation
• overloading
• danger of electric shock
• high temperature of conductors

Q. The primary function of fuse is to

• protect the appliance
• open the circuit
• prevent excessive current
• protect the line

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SAIL Chemical Engineering Paper

Q.1.Nusselt number is the ratio of the

• temperature gradient of the wall to that across the entire pipe.
• temperature difference to the temperature gradient at the wall.
• heat flux at the wall to that across the entire pipe.
• none of these

Q.2.Fouling factor

• is a dimensionless quantity.
• does not provide a safety factor for design.
• accounts for additional resistances to heat flow.
• none of these.

Q.3.Viscosity of gases ....... with increase in temperature.

• increase very rapidly
• increase slowly
• decrease slowly
• remain unaffected

Q.4.Heat transfer co-efficient (h1) for liquids increases with

• increasing temperature
• decreasing temperature
• decreasing Reynolds number
• none of these

Q.5.At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?

• 0.5
• < 0.5
• > 0.6
• < 0.1

Q.6.At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the

• buffer zone
• turbulent core
• both (a) and (b)
• viscous sub-layer

Q.7.Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is

• 0.1
• > 1
• < 1
• 1

Q.8.Natural convection is characterized by

• Grashhoff number
• Peclet number
• Reynolds number
• Prandtl number

Q.9.Which of the following is unimportant in forced convection ?

• Reynolds number
• Prandtl number
• Grashhoff number
• none of these

Q.10.In fored convection, the heat transfer depends on

• Re, Pr
• Re, Gr
• mainly Gr
• Re only

Q.11.The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are

• Re. Gz
• Nu, Pr
• Nu, Pr, Re
• Nu, Gz

Q.12.At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?

• 1
• < 1
• > 1
• none of these

Q.13.Reynold's analogy states that

• St = f/2
• St = f/4
• St = 4f
• St = f1/2

Q.14.For what value of Prandtl number, St = f/2 ?

• 1.5
• 1
• > 1
• < 1

Q.15.Which has the lowest Prandtl number ?

• Liquid metal
• Aqueous solution
• Water
• Lube oil

Q.16.Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

• for fluids in laminar flow
• for fluids in tubulent flow
• when Grashhoff number is very important
• for liquid metals

Q.17.For what value of Prandtl number, the Colburn analogy is valid ?

• 0.06 to 120
• 0.6 to 120
• 1 to 103
• 1 to 50

Q.18.Pick out the correct equation.

• jH = (St) (Pr)2/3 = f/2 
• jH = (St) (Pr)1/3 = f/2
• jH = (St)2/3 (Pr) = f/2
• jH = (St)1/3 (Pr) = f/2

Q.19.Choose the correct equation.

• Nu = (Re) (Pr) (Gz)
• Nu = (Re) (Pr) (St)
• Nu = (Re) (Pr)
• Nu = (Pr) (St)

Q.20.For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

• Nu = 0.023 Re0.8 . Pr0.4
• Nu = p/2 Gz
• Nu = 2/p Gz
• Nu = 2Gz0.5

Q.21.If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

• ha = hl
• ha = 2 hl
• ha = 0.5 hl
• ha = 0.75 hl

Q.22.When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?

• At high fluid velocity
• At low velocity
• When fluid flows past a smooth surface
• None of these

Q.23.The heat transfer co-efficient in film type condensation is ....... that for drop wise condensation.

• greater than
• lower than
• is same as
• half

Q.24.Prandtl number is the ratio of

• momentum diffusivity to mass diffusivity
• momentum diffusivity to thermal diffusivity
• thermal diffusivity to mass diffusivity
• thermal diffusivity to momentum diffusivity

Q.25.All analogy equations connecting friction factor and heat transfer co-efficient apply only to

• wall or skin friction
• form friction
• both above
• turbulent flow

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STEEL AUTHORITY OF INDIA LIMITED
SAIL Management Trainee
Chemical Engineering Model Papers

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SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

SAIL MT Chemical Engineering Model Paper

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SAIL MT Chemical Engineering Model Paper

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SAIL Management Trainee

Electrical Engineering Model Paper

Q.1.Two 100-W, 200-V lamps are connected in series across a 200-V supply. The total power consumed by each lamp will be _____ watts.

• 200
• 100
• 50
• 25 

Q.2.The material used for fuse must have

• low melting point and low specific resistance
• high melting point and low specific resistance
• low melting point and high specific resistance
• none of these

Q.3.The purpose of introducing reactor in the ignition circuit of mercury are rectifier is to limit the

• voltage of the circuit
• rate of change of flux in the circuit
• current in the circuit
• rate of change of current in the circuit

Q.4.Sparking occurs when a load is switched off because the circuit has high

• a resistance
• inductance
• capacitance
• none of these

Q.5.The usual value of the surge impedance of a telephone line is ______ohm.

• 75
• 600
• 500
• 250

Q.6.In the case of a lossy capacitor, series equivalent resistance value will be

• small
• large
• very small
• none of these

Q.7.Time constant of an R-C circuit increases if the value of resistance is

• decreased
• increased
• neither (a) nor (b)
• either (a) or (b)

Q.8.Sparking between contacts can be reduced by inserting a

• capacitor in parallel with contacts
• resistance in the line
• capacitor in series with contacts
• none of these

Q.9.dBm is a

• ratio of power
• unit of power
• unit of voltage
• none of these

Q.10.Decibel is a unit of

• frequency
• impedance
• power ratio
• none of these

Q.11.The absolute unit of resistance is of the dimension of

• velocity
• length
• acceleration
• none of these

Q.12.The absolute unit of inductance is of the dimension of

• time
• length
• mass
• none of these

Q.13.The applied voltage from the circuit being checked is disconnected when an ohmmeter is used because

• the current will decrease the resistance
• the ohmmeter has its own battery
• no current is needed for meter movements
• none of these

Q.14.An accurate voltmeter must have an internal impedance of

• very high value
• very low value
• low value
• none of these

Q.15.A moving –coil instrument can be used to measure

• high frequency a.c.
• low frequency a.c
• both d.c. and a.c
• direct current

Q.16.The voltage drop across the moving coil of a 50-µ A (f.s) PMMC meter at full- scale deflection is ---- the voltage drop across that of a 1-mA (fs) PMMC meter at full-scale deflection.

• less than
• approximately equal to
• greater than
• none of these

Q.17.Voltage stress is maximum in a cable at the surface of the

• insulator
• sheath
• conductor
• none of these

Q.18.The coefficient of coupling between two air core coils depends on

• mutual inductance and self inductances of the two coils
• mutual inductance between two coils only
• self inductances of the two coils only
• none of these

Q.19.The location of lightning arrestor is

• away from the transformer
• near the transformer
• near the circuit breaker
• none of these

Q.20.A conductor of length 1 meter moves at rt. angles to a magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced e.m.f. in the conductor will be ----- volt.

• 75
• 25
• 50
• 100

Q.21.In electrical machines, laminated cores are used with a view to reducing

• eddy current loss
•  
• hysteresis loss
•  

Q.22.A battery

• always delivers power
• always absorbs power
• absorbs power when the internal resistance is non-zero but delivers power when the internal resistance is zero
• can absorb or deliver power depending upon the circuit to which it is connected

Q.23.Decibel is a

• unit of voltage
• unit of power
• ratio of power
• none of these

Q.24.Deflection of pointer of a permanent-magnet moving-coil meter for fixed current is _______ flux density in the airgap between magnetic pole shoes and coil.

• independent of
• directly proportional to
• inversely proportional to
• none of these

Q.25.A moving-iron meter is useful for voltage measurement at _______frequencies.

• high
• low
• very high
• none of these

Q.26.A thermocouple instruments would be used to measure alternating current only?

• low
• very low
• high
• none of these

Q.27.Which of the following instruments will be used to measure alternating current only?

• moving – iron (attraction-types) ammeter
• moving – iron voltmeter
• permanent-magnet type ammeter
• induction-type ammeter

Q.28.A milliammeter can be used

• only as an ammeter
• as a voltmeter
• both as voltmeter and ammeter
• none of these

Q.29.To measure the e.m.f. of a Weston standard cell, one would use a/an 

• electrostatic voltmeter
• hot-wire voltmeter
• galvanometer
• potentiometer–Answer

Q.30.Deflection sensitivity of deflecting plates of cathode ray tube ____ the distance between deflection pates.

• is inversely proportional to
• is directly proportional to
• does not depend on
• none of these

Q.31.Deflection sensitivity of deflecting plates of a cathode ray tube ___the accelerating anode (A3) voltage.

• is inversely proportional to
• is directly proportional to
• does not depend on
• none of these

Q.32.A moving – coil instrument can be used to measure

• direct current
• alternating current
• both direct current and alternating current
• none of these

Q.33.The frequency stability of a crystal oscillator depends upon

• tuned circuit
• crystal
• crystal as well as the tuned circuit
• none of these

Q.34.Hay bridge is usually used for measuring

• resistance
• capacitance
• inductance
• none of these

Q.35.Schering bridge is used for measuring

• capacitance
• inductance
• frequency
• none of these

Q.36.The Wien’s bridge is particularly useful for measuring frequencies of _______value.

• low
• very high
• high
• very low

Q.37.Impedance relay is used to protect

• line within a particular zone
• line beyond a particular zone
• the whole transmission system
• none of these

Q.38.Buchholz relay is used in ______ protection.

• line
• generator
• transformer
• none of these

Q.39.Kirchhoff’s voltage law is not valid for a non-linear network.

• True
• False

Q.40.If a piece of metal wire is stretched, its resistance will increase.

• True
• False

Q.41.In mesh analysis of a network, all the mesh currents must necessarily be either clock-wise or anticlock-wise.

• True
• False

Q.42.An uncharged capacitor is connected across a charged one.There will flow an impulsive current through the circuit.

• True
• False

Q.43.If R, L and C denote resistance, inductance and capacitance respectively, the quantity RC has the same dimensions as that of R/L.

• True
• False

Q.44.If R, L and C denote resistance, inductance and capacitance respectively, then the quantity CR2 has the dimensions, of L.

• True
• False

Q.45.A battery will not cause any current to flow, when it is connected across a pure capacitor, in the steady state even if the capacitor value varies with time.

• True
• False

Q.46.When two capacitors C1 and C2 are connected in series, the effective capacitance is C1+C2

• True
• False

Q.47.The flux linked with a coil of inductance l carrying a current i is ddt(Li).

• True
• False

Q.48.When one wants to connect two batteries in parallel to draw larger current than what can be supplied by one battery, it suffices to ensure that their e.m.f.s. are equal.

• True
• False

Q.49.An ideal battery can supply infinite current

• True
• False

Q.50.1 GHz means 100 Hz.

• True
• False

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