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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Q.1.Loss of heat from unlagged steam pipe to the ambient air is by
conduction
convection
radiation
all (a), (b) & (c)
Q.2.Fourier's law applies to the heat transfer by
convection
radiation
conduction
all (a), (b) & (c)
Q.3.Fourier's law of heat conduction applies to .......... surfaces.
isothermal
non-isothermal
both (a) and (b)
neither (a) and (b)
Q. 4.Unsteady state heat conduction occurs, when
temperature distribution is independent of time
temperature distribution is dependent on time
heat flows in one direction only
three dimensional heat flow is concerned
Q.5.What is the unit of thermal conductivity ?
Kcal/hr.m2 0C
Kcal/hr.m. 0C
Kcal/hr.m
Kcal/hr.0C
Q.6.The unit of heat transfer co-efficient is
BTU/hr.ft2 0F
BTU/hr.0F.ft.
BTU/hr.0F
BTU/hr.ft
Q.7.Which of the following is correct ?
Rate = Driving force * Resistance
Driving force = Rate * Resistance
Resistance = Driving force * Rate
Rate = Resistance/Driving force
Q.8.An insulator should have
low thermal conductivity
high thermal conductivity
less resistance to heat flow
a porous structure
Q.9.Heat flux through several resistance in series in analogous to the current flowing through several
resistances in parallel
capacitors in series
resistances in series
none of these
Q.10.The overall resistance for heat transfer through a series of flat resistance, is the ..... of the resistances.
average
geometric mean
product
sum
Q.11.Which of the following has the highest thermal conductivity ?
Brick
Air
Water
Silver
Q.12.Which area is used in case of heat flow by conduction through a cylinder ?
Logarithmic mean area
Arithmetic mean area
Geometric mean area
None of these
Q.13.For heat flow through very thick walled cylinder, use ............ mean radius.
arithmetic
logarithmic
geometric
either (a) or (c)
Q.14.What is the logarithmic mean of r1 and r2 ?
r1 - r2/ln r1/r2
r1 - r2/ln r2/r1
r2 - r1/ln r1/r2
r1 - r2/ - ln r1/r2
Q.15.What is Nusselt number ?
Cp.μ/k
hD/k
h.Cp/μ
Cp.μ/h
Q.16.Prandtl number is given by
Cp.μ/a
hD/k
Cp.μ/k
μ/h.Cp
Q.17.Thermal diffusivity is given by
k/r.Cp
r.Cp/k
Cp.μ/a
μ/hCp
Q.18.Grashhoff number is given by
g D3. β .∆ tr2/μ2
g D2β∆tr/μ2
g D2β∆tr2μ
g D3β∆tr2/μ
Q.19.If h1=inner film co-efficient & h2=outer film co-efficient, then the overall heat transfer co-efficient is
always less than h1
always between h1 and h2
always higher than h2
dependent on metal resistance
Q.20.Gratez number is give by
mCp/kL
kL/mCp
mCp/kμ
kL/mCp
Q.21.In the equation Q= UA ∆t ; ∆t is
geometric mean temperature difference.
arithmetic mean temperature difference.
logarithmic mean temperature difference.
the difference of average bulk temperatures of hot and cold fluids.
Q.22.Peclet number (Pe) is given by
Pe = Re.Pr
Pe = Re/Pr
Pe = Pr/Re
Pe = Nu.Re
Q.23.Prandtl number is the reciprocal of
Thermal diffusivity/ Momentum diffusivity
Thermal diffusivity x Momentum
Thermal diffusivity x Mass diffusivity
Mass diffusivity x Momentum diffusivity
Q.24.Maximum heat transfer rate is obtained in .......... flow.
laminar
turbulent
creeping
transition region
Q.25.Heat flux is the time rate of heat transfer per unit
length
area
volume
none of these
Q.26.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.27.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.28.Viscosity of gases ....... with increase in temperature.
increase very rapidly
increase slowly
decrease slowly
remain unaffected
Q.29.Heat transfer co-efficient (h1) for liquids increases with
increasing temperature
decreasing temperature
decreasing Reynolds number
none of these
Q.30.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.31.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.32.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.33.Natural convection is characterized by
Grashhoff number
Peclet number
Reynolds number
Prandtl number
Q.34.Which of the following is unimportant in forced convection ?
Reynolds number
Prandtl number
Grashhoff number
none of these
Q.35.In fored convection, the heat transfer depends on
Re, Pr
Re, Gr
mainly Gr
Re only
Q.36.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.37.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.38.Reynold's analogy states that
St = f/2
St = f/4
St = 4f
St = f1/2
Q.39.For what value of Prandtl number, St = f/2 ?
1.5
1
> 1
< 1
Q.40.Which has the lowest Prandtl number ?
Liquid metal
Aqueous solution
Water
Lube oil
Q.41.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.42.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.43.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.44.Choose the correct equation.
Nu = (Re) (Pr) (Gz)
Nu = (Re) (Pr) (St)
Nu = (Re) (Pr)
Nu = (Pr) (St)
Q.45.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.46.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.47.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.48.The heat transfer co-efficient in film type condensation is ....... that for dropwise condensation.
greater than
lower than
is same as
half
Q.49.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.50.All analogy equations connecting friction factor and heat transfer co-efficient apply only to
wall or skin friction
form friction
both (a) and (b)
turbulent flow
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Q.1. To neglect a voltage source, the terminals across the source are
open circuited
short circuited
replaced by some resistance
replaced by an inductor
Q.2.Current I0 in the given circuit will be
10 A
3.33 A
20 A
2.5 A
Q.3. In a resonant circuit, the power factor at resonance is
zero
unity
0.5
1.5
Q.4.In the given circuit voltage V is reduced to half. The current will become
I/2
2 I
1.5 I
I / √R2 + (XL + XC)2
Q.5.The function 3 s has (s + 1) (s + 2)
one zero, two poles
no zero, one pole
no zero, two poles
one zero, no pole
Q.6.One electron volt is equivalent to
1.6 * 10-10 J
1.6 * 10-13 J
1.6 * 10-16 J
1.6 * 10-19 J (Ans)
Q.7.Which of the following is donor impurity element ?
Aluminium
Boron
Phosphorous
Indium.
Q.8.The diameter of an atom is of the order
10-6 m
10-10 m
10-15 m
10-21 m
Q.9.The following Figure represents
LED
Varistor
SCR
Diac
Q.10.If the d.c. valve of a rectified output is 300 V & peak to peak ripple voltage is 10 V, the ripple factor is
1.18%
3.33%
3.36%
6.66%
Q.11.Full wave rectifier output has ripple factor of
1.11
1.21
1.41
1.51
Q.12.In a common base connection IE = 2 mA, IC = 1.9 mA. The value of base current is
0.1 m
0.2 mA
0.3 mA
zero
Q.13.For the action of transistor the base region must be
P-type material
N-type material
very narrow
highly doped
Q.14.Compared to a CB amplifier the CE amplifier has higher
current amplification
output dynamic resistance
leakage current
input dynamic resistance
all of the above
Q.15.When a transistor is biased to cut-off its Y is
0.5
0
1.0
0.8
Q.16.The number of digits in octal system is?
8
7
8 or 7
10
Q.17.The number of digits in hexadecimal system is?
15
10
16
8
Q.18.The number of bits in a nibble is?
8
2
4
16
Q.19.The digit F in hexadecimal system is equivalent to number...........in decimal system?
16
15
17
8
Q.20.Which of the following binary number is equivalent to BCD?
1010
1000
1001
None of these
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Q.1.If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is
Triangular
Trapezoidal
Sinusoidal
Rectangular
Q.2.One of the following statement which is true for relative dielectric constant is -
It is dimensionless
It is not equal to unity for vacuum
It’s value for all substances is less than one
None
Q.3.Pure metals generally have
high conductivity and low temperature coefficient
high conductivity and large temperature coefficient
low conductivity and zero temperature coefficient
low conductivity and high temperature coefficient
Q.4.For small size, high frequency coils, the most common core material is
Air
Ferrite
Powdered ion
Steel
Q.5.For an abrupt junction Varactor diode,the dependence of device capacitance (C) on applied reverse bias (V) is given by
C a V1/3
C a V-1/3
C a V1/2
C a V-1/2
Q.6.A superconductor is a
A material showing perfect conductivity and Meissner effect below a critical temperature
A conductor having zero resistance
A perfect conductor with highest dimagnetic susceptibility
A perfect conductor which becomes resistive when the current density through it exceeds a critical value
Q.7.When a semiconductor based temperature transducer has a temperature coefficient of –2500 mV/0C then this transducer is indeed a
Thermistor
Forward biased pn junction diode
Reverse biased pn junction diode
FET
Q.8.The location of lightning arrestor is -
Near the transformer
Near the circuit breaker
Away from the transformer
None
Q.9.Time constant of an RC circuit increases if the value of the resistance is -
Increased
Decreased
Neither a nor b
Both a and b
Q.10.Intrinsic semiconductors are those which -
Are available locally
Are made of the semiconductor material in its purest from
Have more electrons than holes
Have zero energy gaps
Q.11.The primary control on drain current in a JFET is exerted by -
Channel resistance
Size of depletion regions
Voltage drop across channel
Gate reverse bias
Q.12.The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -
1010
105
10-4
10-6
Q.13.When biased correctly, a zener diode –
acts as a fixed resistance
has a constant voltage across it
has a constant current passing through it
never overheats
Q.14.The current amplification factor adc is given by –
IC/IE
IC/IB
IB/IC
IB/IC
Q.15.Compared to bipolars, FETs have
high input impedance
low input impedance
same input impedance
none
Q.16.The source-drain channel of JFET is -
ohmic
bilateral
unilateral
both a and b
Q.17.A diac is equivalent to a -
Pair of SCRs
Pair of four layer SCRs
Diode and two resistors
Triac width
Q.18.When a sample of N type semiconductor has electron density of 6.25 ´1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ´ 1013/cm3 then the hole density will be –
106/cm3
103/ cm3
1010/ cm3
1012/ cm3
Q.19.When the two networks shown in fig. are equivalent with respect to the terminals 1 and 2 at all frequencies then the values of CA, LB, LC and CC will be –
0.5, 0.33, 6, 0.166
0.5, 3, 6, 0.66
0.5, 3, 3, 2
0.5, 3, 6, 0.166
Q.20.Poles and zeros of a driving point function of a network are simple and interlace on the jw axis.The network consists of elements –
R and C
L and C
R and L
R, L and C
Q.21.The statement 'In any network of linear impedances, the current flowing at any point is equal to the algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf's reduced to zero’ represents -
Kirchhoff's law
Norton's theorem
Thevenin's theorem
Superposition theorem
Q.22.One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at icrowave frequencies of circular cylindrical wave guides is –
TE1 mode
TM01 mode
TE01 mode
Higher order mode
Q.23.A two-port network is symmetrical if –
z11z22 – z12z21 = 1
h11h22 – h12h21 = 1
AD – BC = 1
y11y22 – y12y21 = 1
Q.24.For transmission line load matching over a range of frequencies,it is best to use
a balun
a broad band directional coupler
a double stub
a single stub of adjustable position
Q.25.The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. It can be realised -
by an LC network
as an RC driving point impedance
as an RC driving point admittance
only by an RLC network
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Q.1.‘Please’ and ‘Thank you’ are the little courtesies by which we keep the…….. of life oiled and running smoothly.
river
garden
path
machine
Q.2.The bright colour of this shirt has………. away.
gone
disappeared
faded
paled
Q.3.One major ……….between the Election Commission and the Union Government is related to the powers of the former in respect of the deployment of central police forces at places where an election isheld.
conflict
pain
irritant
culprit
Q.4.Even a ………glance will reveal the mystery
crude
cursory
critical
curious
Q.5.His standard of living has……. since his son joined service.
lifted
increased
risen
heightened
Q.6.The passengers were afraid but the captain …….them that there was no danger.
instructed
advised
promised
assured
Q.7.His first failure did not…… him from making another attempt.
interfere
forbid
frighten
deter
Q.8.No one will ……….. you for having been rude to your teacher.
exclaim
admire
advise
recommend
Q.9.The doctor …….. the patient from taking certain medicines.
banned
prohibited
prescribed
proscribed
Q.10.I ……..a car to be absolutely necessary these days.
think
regard
consider
agree
Q.11.He didn’t have the……….. idea of villager’s problems.
smallest
finest
faintest
feeblest
Q.12.This is a………… translation of the speech.
verbatim
verbal
literal
Literary
Q.13.The news of the secret deal soon despite official silence.
discovered
disclosed
leaked out
divulged
Q.14.No man had a more ………..love for literature, or a higher respect for it, than Samuel Johnson.
arduous
ardent
animated
adroit
Q.15.I have often ………why he went to live abroad.
puzzled
wondered
thought
surprised
Q.16.He lives near ……………a lonely of countryside.
piece
length
stretch
section
Q.17.To nobody else did the story seem ………
contingent
credible
credulous
creditable
Q.18.The transfer of territories could not take place because one state ……….the findings of the Commission.
objected
questioned
rejected
disputed
Q.19.Anticipating renewed rioting, the authorities erected …………….to block off the streets.
dykes
barrages
barricades
barracks
Q.20.When their examinations were over, the children gleefully……. the books they had been reading.
despised
neglected
shelve
overthrow
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