BASIC ENGINEERING
BASIC ENGINEERING MCQs
1:-Twist drills are made by
A:-Stainless steel
B:-Carbide steel
C:-Diamond
D:-High speed steel
Ans: D
2:-Newtons I law of motion gives the concept of
A:-Work
B:-Inertia
C:-Force
D:-Energy
Ans: B
3:-Which of the following physical quantity is not a vector ?
A:-Mass
B:-Momentum
C:-Impulse
D:-Acceleration
Ans: A
4:-When a bullet is fired from a gun, it is recoiled in backward direction due to
A:-Impulse
B:-Inertia
C:-Acceleration
D:-Conservation of momentum
Ans: D
5:-Which one of the following surface in contact has minimum coefficient of friction ?
A:-Wood on wood
B:-Steel on steel
C:-Tyre on dry concrete
D:-Tyre on wet concrete
Ans: B
6:-An increase in load at the free end of a cantilever is likely to cause failure
A:-At fixed support end
B:-Free end
C:-Mid of its length
D:-Any where
Ans: A
7:-A beam 10 m long is simply supported at the ends, carries a load of 1000 N at the mid of span, the bending moment under the load is
A:-500 Nm
B:-1000 Nm
C:-2500 Nm
D:-5000 Nm
Ans: D
8:-Which among the following substance is most elastic ?
A:-Steel
B:-Rubber
C:-Brass
D:-Aluminium
Ans: A
9:-When a body executes simple harmonic motion there is always a constant ratio between the displacement of mass and
A:-Velocity
B:-Acceleration
C:-Frequency
D:-Time period
Ans: B
10:-A closed coil helical spring of stiffness 30 N/mm is arranged in series with another such spring of stiffness 60 N/mm. The stiffness of composite unit is
A:-30 N/mm
B:-45 N/mm
C:-10 N/mm
D:-20 N/mm
Ans: D
11:-The diameter of a shaft is increased from 30 mm to 60 mm and other conditions remain same, how many times its torque carrying capacity increases
A:-2 times
B:-4 times
C:-8 times
D:-16 times
Ans: C
12:-The back staff reading on a B.M. of R.L. 100.000 is 2.685 m. If foresight reading on a point is 1.345 m, the RL of the point is
A:-102.685
B:-101.345
C:-101.340
D:-104.030
Ans: C
13:-An imaging line joining the points of equal elevation on the surface of the earth is called
A:-Contour gradient
B:-Level line
C:-Contour surface
D:-Contour line
Ans: D
14:-Bulking of sand is caused due to
A:-Surface moisture
B:-Air voids
C:-Clay contents
D:-All the above
Ans: A
15:-Long column is one which has ratio of effective length and least lateral dimension
A:-Less than 15
B:-Greater than 15
C:-Less than 20
D:-Greater than 20
Ans: B
16:-Apparatus used to test soundness of cement is
A:-Vicat's apparatus
B:-Vee bee consistometer
C:-Lechatelier apparatus
D:-Compressive strength testing apparatus
Ans: C
17:-According to Indian Road Congress, width of carriage way is
A:-3.75 m for single lane
B:-7.0 m for two lanes without raised kerbs
C:-10.5 m for three lanes
D:-All the above
Ans: D
18:-Piece of brick cut with its one corner equivalent to half the length and half the width of a full brick is known as
A:-Queen closer
B:-King closer
C:-Bevelled closer
D:-Half bat
Ans: B
19:-The standard BOD of water is taken for
A:-5 days at 20°C
B:-3 days at 20°C
C:-5 days at 27°C
D:-2 days at 27°C
Ans: A
20:-Acid rains are caused due to atmospheric pollution of
A:-Carbon dioxide
B:-Chlorofluorocarbon
C:-Ozone
D:-Sulphur dioxide
Ans: D
A:-Stainless steel
B:-Carbide steel
C:-Diamond
D:-High speed steel
Ans: D
2:-Newtons I law of motion gives the concept of
A:-Work
B:-Inertia
C:-Force
D:-Energy
Ans: B
3:-Which of the following physical quantity is not a vector ?
A:-Mass
B:-Momentum
C:-Impulse
D:-Acceleration
Ans: A
4:-When a bullet is fired from a gun, it is recoiled in backward direction due to
A:-Impulse
B:-Inertia
C:-Acceleration
D:-Conservation of momentum
Ans: D
5:-Which one of the following surface in contact has minimum coefficient of friction ?
A:-Wood on wood
B:-Steel on steel
C:-Tyre on dry concrete
D:-Tyre on wet concrete
Ans: B
6:-An increase in load at the free end of a cantilever is likely to cause failure
A:-At fixed support end
B:-Free end
C:-Mid of its length
D:-Any where
Ans: A
7:-A beam 10 m long is simply supported at the ends, carries a load of 1000 N at the mid of span, the bending moment under the load is
A:-500 Nm
B:-1000 Nm
C:-2500 Nm
D:-5000 Nm
Ans: D
8:-Which among the following substance is most elastic ?
A:-Steel
B:-Rubber
C:-Brass
D:-Aluminium
Ans: A
9:-When a body executes simple harmonic motion there is always a constant ratio between the displacement of mass and
A:-Velocity
B:-Acceleration
C:-Frequency
D:-Time period
Ans: B
10:-A closed coil helical spring of stiffness 30 N/mm is arranged in series with another such spring of stiffness 60 N/mm. The stiffness of composite unit is
A:-30 N/mm
B:-45 N/mm
C:-10 N/mm
D:-20 N/mm
Ans: D
11:-The diameter of a shaft is increased from 30 mm to 60 mm and other conditions remain same, how many times its torque carrying capacity increases
A:-2 times
B:-4 times
C:-8 times
D:-16 times
Ans: C
12:-The back staff reading on a B.M. of R.L. 100.000 is 2.685 m. If foresight reading on a point is 1.345 m, the RL of the point is
A:-102.685
B:-101.345
C:-101.340
D:-104.030
Ans: C
13:-An imaging line joining the points of equal elevation on the surface of the earth is called
A:-Contour gradient
B:-Level line
C:-Contour surface
D:-Contour line
Ans: D
14:-Bulking of sand is caused due to
A:-Surface moisture
B:-Air voids
C:-Clay contents
D:-All the above
Ans: A
15:-Long column is one which has ratio of effective length and least lateral dimension
A:-Less than 15
B:-Greater than 15
C:-Less than 20
D:-Greater than 20
Ans: B
16:-Apparatus used to test soundness of cement is
A:-Vicat's apparatus
B:-Vee bee consistometer
C:-Lechatelier apparatus
D:-Compressive strength testing apparatus
Ans: C
17:-According to Indian Road Congress, width of carriage way is
A:-3.75 m for single lane
B:-7.0 m for two lanes without raised kerbs
C:-10.5 m for three lanes
D:-All the above
Ans: D
18:-Piece of brick cut with its one corner equivalent to half the length and half the width of a full brick is known as
A:-Queen closer
B:-King closer
C:-Bevelled closer
D:-Half bat
Ans: B
19:-The standard BOD of water is taken for
A:-5 days at 20°C
B:-3 days at 20°C
C:-5 days at 27°C
D:-2 days at 27°C
Ans: A
20:-Acid rains are caused due to atmospheric pollution of
A:-Carbon dioxide
B:-Chlorofluorocarbon
C:-Ozone
D:-Sulphur dioxide
Ans: D
21:-A 150Ω resistance AB is connected across 240 V DC supply. Calculate the value of the resistance which when
connected between the midpoint of AB and end A, will carry a current of 0.8 A.
A:-100Ω
B:-125Ω
C:-90Ω
D:-112.5Ω
Ans: D
22:-The force experienced by a unit north pole at any point is called the
A:-MMF
B:-Magnetic field strength
C:-Magnetic flux density
D:-Magnetic potential
Ans: B
23:-The principle of statically induced EMF is utilized in
A:-Transformer
B:-Motor
C:-Generator
D:-Battery
Ans: A
24:-The form factor of sinusoidal wave is
A:-1.414
B:-1.11
C:-2
D:-1.5
Ans: B
25:-In an AC circuit, the ratio of kW/kVA represents
A:-Power factor
B:-Load factor
C:-Form factor
D:-Diversity factor
Ans: A
26:-Which of the following is not expressed in ohms ?
A:-Resistance
B:-Inductance
C:-Inductive reactance
D:-Capacitive reactance
Ans: B
27:-Which of the following statements associated with three phase delta connected circuits is true ?
A:-Line voltage is equal to phase voltage
B:-Line current is equal to phase current
C:-Line voltage is √3 ` `times of phase voltage
D:-Line currents are 60 degree apart
Ans: A
28:-A transformer having 1000 primary turns is connected to a 250 V AC supply. For a secondary voltage of 400 V the number of secondary turns should be
A:-1600
B:-250
C:-400
D:-1250
Ans: A
29:-The induced emf in the armature conductors of a DC motor is
A:-Sinusoidal
B:-Trapezoidal
C:-Rectangular
D:-DC
Ans: A
30:-A 4 pole wave wound armature of a DC generator has 720 conductors and is rotated at 1000 RPM. If the useful flux is 20 m Wb. Calculate the generated voltage
A:-240 V
B:-480 V
C:-960 V
D:-None of the above
Ans: B
31:-The pointer of an indicating instrument is in the final deflected position, when
A:-The deflecting torque is zero
B:-The controlling torque is zero
C:-The damping torque is zero
D:-Both deflecting and controlling torques are zero
Ans: C
32:-PMMC instrument can be used for
A:-AC only
B:-Both AC and DC
C:-DC only
D:-None of the above
Ans: C
33:-The Watt hour meter is _______ instrument.
A:-An integrating
B:-An indicating
C:-A recording
D:-A transfer
Ans: A
34:-In a household single phase induction type energy meter, the meter can be reversed by
A:-Reversing the supply terminals
B:-Reversing the load terminals
C:-Opening the meter connections and reversing either the potential coil terminals or current coil terminals
D:-Opening the meter and reversing connections of both current and potential coil circuits
Ans: C
35:-A voltmeter has resistance of 2000Ω when it is connected across a DC circuit and its power consumption is 2 mW. Suppose this voltmeter is replaced by voltmeter of 4000Ω resistance in the circuit, the power consumption will be
A:-4 mW
B:-2 mW
C:-1 mW
D:-0.5 mW
Ans: C
36:-The power in a three phase circuit is measured using two watt meter method. The reading of one of the watt meters is positive and that of the other is negative. The magnitude of the reading is different. It can be concluded that the power factor of the circuit is
A:-Unity
B:-Zero (lagging)
C:-0.5 (lagging)
D:-Less than 0.5 (lagging)
Ans: D
37:-Creeping in a single phase induction type energy meter may be due to
A:-Overcompensation for friction
B:-Overvoltage
C:-Vibration
D:-All of the above
Ans: D
38:-A 250 V moving iron voltmeter takes a current of 0.05 A when connected to a 250 V DC supply. The coil has an
inductance of 1 H. Determine the percentage error when the meter is connected to a 250 V, 100 Hz AC supply.
A:-1%
B:-0.8%
C:-10%
D:-0.5%
Ans: B
39:-Which of the following instrument is equally accurate in DC as well as AC circuits ?
A:-Dynamometer type watt meter
B:-Moving iron ammeter
C:-PMMC voltmeter
D:-Induction type watt meter
Ans: A
40:-The scale of PMMC instrument is uniform because
A:-Of eddy current damping
B:-External magnetic fields have no effect
C:-It is spring controlled
D:-It has no hysteresis loss
Ans: C
41:-The donor concentration of Si crystal is 1.9 × `10^(24)` /`m^(3)` and the intrinsic concentration is 1.4 ×
`10^(18)`/`m^(3)` . Estimate the concentration of holes
A:-1.0 × `10^(12)` `/m^(3)`
B:-1.0 × `10^(6)` `/m^(3)`
C:-0.7 × `10^(6)` `/m^(3)`
D:-1.4 × `10^(12)` `/m^(3)`
Ans: A
42:-The Fermi level of intrinsic semiconductor is
A:-Above the conduction band
B:-Below the valance band
C:-Midway between conduction band and valance band
D:-None of the above
Ans: C
43:-Diode in reverse bias is equivalent to
A:-Resistor of low resistance
B:-Resistor of high resistance
C:-Capacitor of high time constant
D:-Capacitor of low time constant
Ans: B
44:-Give the relation between `alpha` and` ` `beta` of a transistor``
A:-`alpha =` `(beta)/(1-beta)`
B:-`alpha =` `(beta+1)/(beta)`
C:-`beta =` `(alpha+1)/(alpha)`
D:-`beta =` `(alpha)/(1-alpha)`
Ans: D
45:-The diode that can be used as a voltage regulator is
A:-Photo Diode
B:-Zener Diode
C:-PIN Diode
D:-Varactor Diode
Ans: B
46:-When the collector voltage in a NPN transistor increases, the effective base width decreases. This phenomenon
is called
A:-Schottky Effect
B:-Punch Through Effect
C:-Eber's Moll Effect
D:-Early Effect
Ans: D
47:-Find the amplification factor of a JFET having drain resistance 39 KΩ and transconductance 3 mS
A:-13
B:-39
C:-117
D:-42
Ans: C
48:-Peak inverse voltage of a diode in centre tap full wave rectifier is
A:-`2V_(m)`
B:-`V_(m)`
C:-`V_(m)``/`2
D:-`V_(m)2`
Ans: A
49:-The various colours of LED can be obtained by varying the
A:-Material of the diode
B:-Cut in voltage of the diode
C:-Breakdown voltage of the diode
D:-Doping concentration of the diode
Ans: A
50:-Determine the stability factor of a transistor with β = 100 with fixed bias is
A:-100
B:-78
C:-150
D:-101
Ans: D
51:-The voltage buffer has
A:-Low input impedance and high output impedance
B:-High input impedance and low output impedance
C:-Low input impedance and low output impedance
D:-High input impedance and high output impedance
Ans: B
52:-The gain of the RC coupled amplifier gets reduced at high frequencies due to
A:-Transistor
B:-Coupling capacitor
C:-Bypass capacitor
D:-Interelectrode capacitance
Ans: D
53:-Give the output signal of a common emitter amplifier having a gain of 100 for an input signal 0.3 cos (200t)
A:-3 cos (200t)
B:-30 cos (200t + 90°)
C:-30 cos (200t + 180°)
D:-100 cos (200t + 90°)
Ans: C
54:-Heat sinks are used in power amplifier circuits to
A:-Decrease output power
B:-Increase output power
C:-Increase collector dissipation rating of the transistor
D:-Reduce the heat losses in the transistor
Ans: C
55:-The main advantage of crystal oscillator is
A:-High output voltage
B:-High frequency stability
C:-High efficiency
D:-High gain
Ans: B
56:-Which of the given characteristics are false in case of ideal OPAMP ?
A:-Infinite output impedance
B:-Infinite input impedance
C:-Infinite CMRR
D:-Infinite bandwidth
Ans: A
57:-Find the signal to noise ratio for diode current `I_(D)` = 1`mu`A over a 2 MHz bandwidth.
A:-20 dB
B:-45 dB
C:-72 dB
D:-37 dB
Ans: C
58:-Which of the following causes the drain current to increase with `V_(DS)` in the saturation region ?
A:-Channel length modulation
B:-Inversion charge in the channel
C:-Body effect
D:-Hole mobility
Ans: A
59:-Why is polysilicon, rather than metal, used for the gate in modern MOS transistors ?
A:-Better channel inversion
B:-It simplifies the fabrication process
C:-Lower resistance
D:-Makes a better contact to sources and drains
Ans: B
60:-What is the level of roll off in most OPAMPs ?
A:-–6 dB/decade
B:-–20 dB/octave
C:-–6 dB/decade or –20 dB/octave
D:-–6 dB/octave or –20 dB/decade
Ans: D
61:-Choose the open thermodynamic system
A:-Manual ice cream freezer
B:-Centrifugal pump
C:-Pressure cooker
D:-Automobile battery
Ans: B
62:-Choose the specific property of a thermodynamic system
A:-Density
B:-Viscocity
C:-Temperature
D:-Pressure
Ans: A
63:-One ton of refrigeration is equivalent to
A:-1 kW
B:-2 kW
C:-3.5 kW
D:-100 kW
Ans: C
64:-What is mounted on the crankshaft to transform rotary motion into back and forth motion for actuating the valves ?
A:-Fly wheel
B:-Slider and crank
C:-Crank
D:-Cam shaft
Ans: D
65:-Which is not a part of petrol engine ?
A:-Valve mechanism
B:-Fuel injector
C:-Induction coil
D:-Air filter
Ans: B
66:-A pelton wheel is ideally suited for
A:-High head/Low discharge
B:-High head/High discharge
C:-Low head/Low discharge
D:-Medium head/Medium discharge
Ans: A
connected between the midpoint of AB and end A, will carry a current of 0.8 A.
A:-100Ω
B:-125Ω
C:-90Ω
D:-112.5Ω
Ans: D
22:-The force experienced by a unit north pole at any point is called the
A:-MMF
B:-Magnetic field strength
C:-Magnetic flux density
D:-Magnetic potential
Ans: B
23:-The principle of statically induced EMF is utilized in
A:-Transformer
B:-Motor
C:-Generator
D:-Battery
Ans: A
24:-The form factor of sinusoidal wave is
A:-1.414
B:-1.11
C:-2
D:-1.5
Ans: B
25:-In an AC circuit, the ratio of kW/kVA represents
A:-Power factor
B:-Load factor
C:-Form factor
D:-Diversity factor
Ans: A
26:-Which of the following is not expressed in ohms ?
A:-Resistance
B:-Inductance
C:-Inductive reactance
D:-Capacitive reactance
Ans: B
27:-Which of the following statements associated with three phase delta connected circuits is true ?
A:-Line voltage is equal to phase voltage
B:-Line current is equal to phase current
C:-Line voltage is √3 ` `times of phase voltage
D:-Line currents are 60 degree apart
Ans: A
28:-A transformer having 1000 primary turns is connected to a 250 V AC supply. For a secondary voltage of 400 V the number of secondary turns should be
A:-1600
B:-250
C:-400
D:-1250
Ans: A
29:-The induced emf in the armature conductors of a DC motor is
A:-Sinusoidal
B:-Trapezoidal
C:-Rectangular
D:-DC
Ans: A
30:-A 4 pole wave wound armature of a DC generator has 720 conductors and is rotated at 1000 RPM. If the useful flux is 20 m Wb. Calculate the generated voltage
A:-240 V
B:-480 V
C:-960 V
D:-None of the above
Ans: B
31:-The pointer of an indicating instrument is in the final deflected position, when
A:-The deflecting torque is zero
B:-The controlling torque is zero
C:-The damping torque is zero
D:-Both deflecting and controlling torques are zero
Ans: C
32:-PMMC instrument can be used for
A:-AC only
B:-Both AC and DC
C:-DC only
D:-None of the above
Ans: C
33:-The Watt hour meter is _______ instrument.
A:-An integrating
B:-An indicating
C:-A recording
D:-A transfer
Ans: A
34:-In a household single phase induction type energy meter, the meter can be reversed by
A:-Reversing the supply terminals
B:-Reversing the load terminals
C:-Opening the meter connections and reversing either the potential coil terminals or current coil terminals
D:-Opening the meter and reversing connections of both current and potential coil circuits
Ans: C
35:-A voltmeter has resistance of 2000Ω when it is connected across a DC circuit and its power consumption is 2 mW. Suppose this voltmeter is replaced by voltmeter of 4000Ω resistance in the circuit, the power consumption will be
A:-4 mW
B:-2 mW
C:-1 mW
D:-0.5 mW
Ans: C
36:-The power in a three phase circuit is measured using two watt meter method. The reading of one of the watt meters is positive and that of the other is negative. The magnitude of the reading is different. It can be concluded that the power factor of the circuit is
A:-Unity
B:-Zero (lagging)
C:-0.5 (lagging)
D:-Less than 0.5 (lagging)
Ans: D
37:-Creeping in a single phase induction type energy meter may be due to
A:-Overcompensation for friction
B:-Overvoltage
C:-Vibration
D:-All of the above
Ans: D
38:-A 250 V moving iron voltmeter takes a current of 0.05 A when connected to a 250 V DC supply. The coil has an
inductance of 1 H. Determine the percentage error when the meter is connected to a 250 V, 100 Hz AC supply.
A:-1%
B:-0.8%
C:-10%
D:-0.5%
Ans: B
39:-Which of the following instrument is equally accurate in DC as well as AC circuits ?
A:-Dynamometer type watt meter
B:-Moving iron ammeter
C:-PMMC voltmeter
D:-Induction type watt meter
Ans: A
40:-The scale of PMMC instrument is uniform because
A:-Of eddy current damping
B:-External magnetic fields have no effect
C:-It is spring controlled
D:-It has no hysteresis loss
Ans: C
41:-The donor concentration of Si crystal is 1.9 × `10^(24)` /`m^(3)` and the intrinsic concentration is 1.4 ×
`10^(18)`/`m^(3)` . Estimate the concentration of holes
A:-1.0 × `10^(12)` `/m^(3)`
B:-1.0 × `10^(6)` `/m^(3)`
C:-0.7 × `10^(6)` `/m^(3)`
D:-1.4 × `10^(12)` `/m^(3)`
Ans: A
42:-The Fermi level of intrinsic semiconductor is
A:-Above the conduction band
B:-Below the valance band
C:-Midway between conduction band and valance band
D:-None of the above
Ans: C
43:-Diode in reverse bias is equivalent to
A:-Resistor of low resistance
B:-Resistor of high resistance
C:-Capacitor of high time constant
D:-Capacitor of low time constant
Ans: B
44:-Give the relation between `alpha` and` ` `beta` of a transistor``
A:-`alpha =` `(beta)/(1-beta)`
B:-`alpha =` `(beta+1)/(beta)`
C:-`beta =` `(alpha+1)/(alpha)`
D:-`beta =` `(alpha)/(1-alpha)`
Ans: D
45:-The diode that can be used as a voltage regulator is
A:-Photo Diode
B:-Zener Diode
C:-PIN Diode
D:-Varactor Diode
Ans: B
46:-When the collector voltage in a NPN transistor increases, the effective base width decreases. This phenomenon
is called
A:-Schottky Effect
B:-Punch Through Effect
C:-Eber's Moll Effect
D:-Early Effect
Ans: D
47:-Find the amplification factor of a JFET having drain resistance 39 KΩ and transconductance 3 mS
A:-13
B:-39
C:-117
D:-42
Ans: C
48:-Peak inverse voltage of a diode in centre tap full wave rectifier is
A:-`2V_(m)`
B:-`V_(m)`
C:-`V_(m)``/`2
D:-`V_(m)2`
Ans: A
49:-The various colours of LED can be obtained by varying the
A:-Material of the diode
B:-Cut in voltage of the diode
C:-Breakdown voltage of the diode
D:-Doping concentration of the diode
Ans: A
50:-Determine the stability factor of a transistor with β = 100 with fixed bias is
A:-100
B:-78
C:-150
D:-101
Ans: D
51:-The voltage buffer has
A:-Low input impedance and high output impedance
B:-High input impedance and low output impedance
C:-Low input impedance and low output impedance
D:-High input impedance and high output impedance
Ans: B
52:-The gain of the RC coupled amplifier gets reduced at high frequencies due to
A:-Transistor
B:-Coupling capacitor
C:-Bypass capacitor
D:-Interelectrode capacitance
Ans: D
53:-Give the output signal of a common emitter amplifier having a gain of 100 for an input signal 0.3 cos (200t)
A:-3 cos (200t)
B:-30 cos (200t + 90°)
C:-30 cos (200t + 180°)
D:-100 cos (200t + 90°)
Ans: C
54:-Heat sinks are used in power amplifier circuits to
A:-Decrease output power
B:-Increase output power
C:-Increase collector dissipation rating of the transistor
D:-Reduce the heat losses in the transistor
Ans: C
55:-The main advantage of crystal oscillator is
A:-High output voltage
B:-High frequency stability
C:-High efficiency
D:-High gain
Ans: B
56:-Which of the given characteristics are false in case of ideal OPAMP ?
A:-Infinite output impedance
B:-Infinite input impedance
C:-Infinite CMRR
D:-Infinite bandwidth
Ans: A
57:-Find the signal to noise ratio for diode current `I_(D)` = 1`mu`A over a 2 MHz bandwidth.
A:-20 dB
B:-45 dB
C:-72 dB
D:-37 dB
Ans: C
58:-Which of the following causes the drain current to increase with `V_(DS)` in the saturation region ?
A:-Channel length modulation
B:-Inversion charge in the channel
C:-Body effect
D:-Hole mobility
Ans: A
59:-Why is polysilicon, rather than metal, used for the gate in modern MOS transistors ?
A:-Better channel inversion
B:-It simplifies the fabrication process
C:-Lower resistance
D:-Makes a better contact to sources and drains
Ans: B
60:-What is the level of roll off in most OPAMPs ?
A:-–6 dB/decade
B:-–20 dB/octave
C:-–6 dB/decade or –20 dB/octave
D:-–6 dB/octave or –20 dB/decade
Ans: D
61:-Choose the open thermodynamic system
A:-Manual ice cream freezer
B:-Centrifugal pump
C:-Pressure cooker
D:-Automobile battery
Ans: B
62:-Choose the specific property of a thermodynamic system
A:-Density
B:-Viscocity
C:-Temperature
D:-Pressure
Ans: A
63:-One ton of refrigeration is equivalent to
A:-1 kW
B:-2 kW
C:-3.5 kW
D:-100 kW
Ans: C
64:-What is mounted on the crankshaft to transform rotary motion into back and forth motion for actuating the valves ?
A:-Fly wheel
B:-Slider and crank
C:-Crank
D:-Cam shaft
Ans: D
65:-Which is not a part of petrol engine ?
A:-Valve mechanism
B:-Fuel injector
C:-Induction coil
D:-Air filter
Ans: B
66:-A pelton wheel is ideally suited for
A:-High head/Low discharge
B:-High head/High discharge
C:-Low head/Low discharge
D:-Medium head/Medium discharge
Ans: A
67:-Which of the following water turbines does not require a draft tube ?
A:-Propeller turbine
B:-Kaplan turbine
C:-Francis turbine
D:-Pelton turbine
Ans: D
68:-For transferring power through 90° the suitable gear is
A:-Helical
B:-Spur
C:-Bevel
D:-Herringbone
Ans: C
69:-Cavitation in centrifugal pumps can be reduced by
A:-Reducing the discharge
B:-Reducing suction head
C:-Throttling the discharge
D:-Increase the flow velocity
Ans: B
70:-The pump is to pumping high viscous fluid belongs the category of
A:-Screw pump
B:-Turbine pump
C:-Planger pump
D:-Centrifugal pump
Ans: A
71:-Identify the hardest tool material
A:-Steel
B:-Ceramics
C:-Tungston carbide
D:-Diamond
Ans: D
72:-The essential constituent of any hardened steel is
A:-Austenite
B:-Cementite
C:-Martensite
D:-Pearlite
Ans: C
73:-The collapsible tooth paste tube are made by
A:-Drawing
B:-Deep drawing
C:-Rolling
D:-Extrusion
Ans: D
74:-The vertical passage for bringing molten metal to mould cavity is called
A:-Sprue
B:-Riser
C:-Gate
D:-Chaplet
Ans: A
75:-In investment casting the mould is usually made of
A:-Aluminium
B:-Bronze
C:-Wax
D:-Steel
Ans: C
76:-Electronic components are usually joined by
A:-Brazing
B:-Sintering
C:-Soldering
D:-Welding
Ans: C
77:-Which of the following is a single point cutting tool ?
A:-Parting tool
B:-Milling cutter
C:-Grinding wheel
D:-Broach
Ans: A
78:-Enlarging an existing circular hole with a rotating single point tool is called
A:-Drilling
B:-Boring
C:-Reaming
D:-Countering
Ans: B
79:-Which of the following aspect would lead to interchangeability ?
A:-Process planning
B:-Operator training
C:-Quality control
D:-Product design
Ans: C
80:-Chlorine available in water after chlorination process is called
A:-Available chlorine
B:-Free chlorine
C:-Combined chlorine
D:-Residual chlorine
Ans: D
A:-Propeller turbine
B:-Kaplan turbine
C:-Francis turbine
D:-Pelton turbine
Ans: D
68:-For transferring power through 90° the suitable gear is
A:-Helical
B:-Spur
C:-Bevel
D:-Herringbone
Ans: C
69:-Cavitation in centrifugal pumps can be reduced by
A:-Reducing the discharge
B:-Reducing suction head
C:-Throttling the discharge
D:-Increase the flow velocity
Ans: B
70:-The pump is to pumping high viscous fluid belongs the category of
A:-Screw pump
B:-Turbine pump
C:-Planger pump
D:-Centrifugal pump
Ans: A
71:-Identify the hardest tool material
A:-Steel
B:-Ceramics
C:-Tungston carbide
D:-Diamond
Ans: D
72:-The essential constituent of any hardened steel is
A:-Austenite
B:-Cementite
C:-Martensite
D:-Pearlite
Ans: C
73:-The collapsible tooth paste tube are made by
A:-Drawing
B:-Deep drawing
C:-Rolling
D:-Extrusion
Ans: D
74:-The vertical passage for bringing molten metal to mould cavity is called
A:-Sprue
B:-Riser
C:-Gate
D:-Chaplet
Ans: A
75:-In investment casting the mould is usually made of
A:-Aluminium
B:-Bronze
C:-Wax
D:-Steel
Ans: C
76:-Electronic components are usually joined by
A:-Brazing
B:-Sintering
C:-Soldering
D:-Welding
Ans: C
77:-Which of the following is a single point cutting tool ?
A:-Parting tool
B:-Milling cutter
C:-Grinding wheel
D:-Broach
Ans: A
78:-Enlarging an existing circular hole with a rotating single point tool is called
A:-Drilling
B:-Boring
C:-Reaming
D:-Countering
Ans: B
79:-Which of the following aspect would lead to interchangeability ?
A:-Process planning
B:-Operator training
C:-Quality control
D:-Product design
Ans: C
80:-Chlorine available in water after chlorination process is called
A:-Available chlorine
B:-Free chlorine
C:-Combined chlorine
D:-Residual chlorine
Ans: D
81:-The thermal conductivity is maximum for
A:-Silver
B:-Chrome-nickel steel
C:-Plaster of paris
D:-Carbon steel
Ans: A
82:-A metal wire of 0.01m diameter and thermal conductivity `200 (W)/(mK)` is exposed to a fluid stream with a convective heat transfer coefficient `1000 (W)/(m^(2)K` . The Biot number is
A:-10
B:-12.5
C:-0.0035
D:-0.0125
Ans: D
83:-A packed tower is designed to recover 98% `CO_(2)` from a gas mixture containing 10% `CO_(2)` and 90% air using water. Y = 14 X can be used for equilibrium conditions where Y is kg `CO_(2)`/kg dry air and X is kg `CO_(2)`/kg water. The water to gas rate is kept 30% more than the minimum value. The height of the tower if HTU is 1 metre will be
A:-10.3 m
B:-11.3 m
C:-12.3 m
D:-14.3 m
Ans: B
84:-A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
A:-Lower heat transfer area
B:-Lower steam economy
C:-Higher steam economy
D:-Higher solute concentration in the product
Ans: C
85:-The overall heat transfer coefficient for a shell and tube heat exchanger for clean surface is `u_(o) = 400 (W)/(m^(2)K)`. The fouling factor after one year of operation is found to be `hd_(o) = 2000` `(W)/(m^(2)K)` . The overall heat transfer coefficient at this time is
A:-1200 `(W)/(m^(2)K)`
B:-894 `(W)/(m^(2)K)`
C:-333 `(W)/(m^(2)K)`
D:-287 `(W)/(m^(2)K)`
Ans: C
86:-In a shell and tube heat exchanger, baffles are provided on the shell side to ``
A:-Prevent the stagnation of shell side fluid
B:-Improve heat transfer
C:-Provide support for tubes
D:-All of the above
Ans: D
87:- In a thermal (steam) power plant, the feed water is preheated in -------
A:-Air preheater B:-Economiser C:-Condenser D:-Boiler
Ans: B
88:-A continuous gravity decanter is used for separation of two immiscible liquids A and B of differing densities `rho_(A)` and `rho_(B)` . If μ is the viscosity of continuous phase, the separation time is given by
A:-t=`(100mu)/(rho_(A)+rho_(B))`
B:-t =`(100mu)/(rho_(A)rho_(B))`
C:-t=`(100mu)/(rho_(A)-rho_(B))`
D:-t=`100murho_(A)rho_(B)`
Ans: C
89:-If the suction pressure is only slightly greater than the vapor pressure
A:-Some liquid may flash to vapor inside the pump
B:-There will be vaporization in the suction line
C:-No liquid can be drawn into the pump
D:-None of the above
Ans: A
90:-The pressure loss is maximum for
A:-Orificemeter
B:-Venturimeter
C:-Rotameter
D:-Flow nozzle
Ans: A
91:-The rate determining step of Michaelis Menten kinetics is
A:-The complex formation step
B:-The complex dissociation step to produce product
C:-Both 1) and 2)
D:-None of the above
Ans: B
92:-For any particular duty and for all positive reaction orders
A:-Mixed reactor is always smaller than a plug flow reactor
B:-Mixed reactor and plug flow reactor are of same volume
C:-Mixed reactor is always larger than the plug flow reactor
D:-None of the above
Ans: C
93:-The power required for a propeller mixer of diameter 25 cm for a liquid of specific gravity 1.4 and viscosity 2.5 cp for operating at a Reynolds number of 20,000 and power number is equal to 32 is given by
A:-0.816 W
B:-81.6 W
C:-816 W
D:-8.16 W
Ans: D
94:-The Henry's law constant for oxygen in water at 298 K is `4.4 xx 10^(4)` bar. For a partial pressure of oxygen
at 0.25 bar and at 298 K, the solubility of oxygen in water is
A:-`5.68 xx 10^(-5)` moles/mole `H_(2)O`
B:-5.68 moles/mole `H_(2)O`
C:-`5.68 xx 10^(-6)` moles/mole `H_(2)O`
D:-`5.68 xx 10^(-7)` moles/mole `H_(2)O`
Ans: C
95:-A stream of nitrogen flowing at the rate of 7000 kg/h and a stream of hydrogen flowing at the rate of 1500 kg/h mix adiabatically in a steady flow process. If the gases are ideal and are at the same temperature and pressure, the rate of entropy increases in KJ/hK is
A:--4675.3
B:-4675.3
C:-`4675.3 xx 10^(3)`
D:-None of the above
Ans: A
96:-The Lewis number is defined as
A:-`(N_(pr))/(N_(sc))`
B:-`N_(pr)` `N_(sc)`
C:-`N_(sc)/N_(pr)`
D:-`Np_(r).N_(sc)^(1/2)`
Ans: C
97:-If the feed is all saturated vapour, then q is given by
A:-q = 0
B:-q = 1
C:-q < 1
D:-q > 1
Ans: A
98:-The mode of propagation of FM Signal is by
A:-Sky wave
B:-Ground wave
C:-Direct wave
D:-Reflected wave
Ans: C
99:-Adding a weak cell in series with a battery causes
A:-Decrease in Current
B:-Increase in Current
C:-Decrease in Voltage
D:-No Change in Voltage and Current
Ans: C
100:-Wien Bridge Oscillator Circuit uses
A:-Negative Feed Back
B:-Positive Feed Back
C:-Both Negative and Positive Feed Back
D:-None of the above
Ans: C
1:-In a hydroelectric power plant, the level of water stored in reservoir is known as ----
A:-Hydraulic head B:-Tail water level
C:-Headrace D:-Spillway level
Ans: C
A:-Silver
B:-Chrome-nickel steel
C:-Plaster of paris
D:-Carbon steel
Ans: A
82:-A metal wire of 0.01m diameter and thermal conductivity `200 (W)/(mK)` is exposed to a fluid stream with a convective heat transfer coefficient `1000 (W)/(m^(2)K` . The Biot number is
A:-10
B:-12.5
C:-0.0035
D:-0.0125
Ans: D
83:-A packed tower is designed to recover 98% `CO_(2)` from a gas mixture containing 10% `CO_(2)` and 90% air using water. Y = 14 X can be used for equilibrium conditions where Y is kg `CO_(2)`/kg dry air and X is kg `CO_(2)`/kg water. The water to gas rate is kept 30% more than the minimum value. The height of the tower if HTU is 1 metre will be
A:-10.3 m
B:-11.3 m
C:-12.3 m
D:-14.3 m
Ans: B
84:-A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
A:-Lower heat transfer area
B:-Lower steam economy
C:-Higher steam economy
D:-Higher solute concentration in the product
Ans: C
85:-The overall heat transfer coefficient for a shell and tube heat exchanger for clean surface is `u_(o) = 400 (W)/(m^(2)K)`. The fouling factor after one year of operation is found to be `hd_(o) = 2000` `(W)/(m^(2)K)` . The overall heat transfer coefficient at this time is
A:-1200 `(W)/(m^(2)K)`
B:-894 `(W)/(m^(2)K)`
C:-333 `(W)/(m^(2)K)`
D:-287 `(W)/(m^(2)K)`
Ans: C
86:-In a shell and tube heat exchanger, baffles are provided on the shell side to ``
A:-Prevent the stagnation of shell side fluid
B:-Improve heat transfer
C:-Provide support for tubes
D:-All of the above
Ans: D
87:- In a thermal (steam) power plant, the feed water is preheated in -------
A:-Air preheater B:-Economiser C:-Condenser D:-Boiler
Ans: B
88:-A continuous gravity decanter is used for separation of two immiscible liquids A and B of differing densities `rho_(A)` and `rho_(B)` . If μ is the viscosity of continuous phase, the separation time is given by
A:-t=`(100mu)/(rho_(A)+rho_(B))`
B:-t =`(100mu)/(rho_(A)rho_(B))`
C:-t=`(100mu)/(rho_(A)-rho_(B))`
D:-t=`100murho_(A)rho_(B)`
Ans: C
89:-If the suction pressure is only slightly greater than the vapor pressure
A:-Some liquid may flash to vapor inside the pump
B:-There will be vaporization in the suction line
C:-No liquid can be drawn into the pump
D:-None of the above
Ans: A
90:-The pressure loss is maximum for
A:-Orificemeter
B:-Venturimeter
C:-Rotameter
D:-Flow nozzle
Ans: A
91:-The rate determining step of Michaelis Menten kinetics is
A:-The complex formation step
B:-The complex dissociation step to produce product
C:-Both 1) and 2)
D:-None of the above
Ans: B
92:-For any particular duty and for all positive reaction orders
A:-Mixed reactor is always smaller than a plug flow reactor
B:-Mixed reactor and plug flow reactor are of same volume
C:-Mixed reactor is always larger than the plug flow reactor
D:-None of the above
Ans: C
93:-The power required for a propeller mixer of diameter 25 cm for a liquid of specific gravity 1.4 and viscosity 2.5 cp for operating at a Reynolds number of 20,000 and power number is equal to 32 is given by
A:-0.816 W
B:-81.6 W
C:-816 W
D:-8.16 W
Ans: D
94:-The Henry's law constant for oxygen in water at 298 K is `4.4 xx 10^(4)` bar. For a partial pressure of oxygen
at 0.25 bar and at 298 K, the solubility of oxygen in water is
A:-`5.68 xx 10^(-5)` moles/mole `H_(2)O`
B:-5.68 moles/mole `H_(2)O`
C:-`5.68 xx 10^(-6)` moles/mole `H_(2)O`
D:-`5.68 xx 10^(-7)` moles/mole `H_(2)O`
Ans: C
95:-A stream of nitrogen flowing at the rate of 7000 kg/h and a stream of hydrogen flowing at the rate of 1500 kg/h mix adiabatically in a steady flow process. If the gases are ideal and are at the same temperature and pressure, the rate of entropy increases in KJ/hK is
A:--4675.3
B:-4675.3
C:-`4675.3 xx 10^(3)`
D:-None of the above
Ans: A
96:-The Lewis number is defined as
A:-`(N_(pr))/(N_(sc))`
B:-`N_(pr)` `N_(sc)`
C:-`N_(sc)/N_(pr)`
D:-`Np_(r).N_(sc)^(1/2)`
Ans: C
97:-If the feed is all saturated vapour, then q is given by
A:-q = 0
B:-q = 1
C:-q < 1
D:-q > 1
Ans: A
98:-The mode of propagation of FM Signal is by
A:-Sky wave
B:-Ground wave
C:-Direct wave
D:-Reflected wave
Ans: C
99:-Adding a weak cell in series with a battery causes
A:-Decrease in Current
B:-Increase in Current
C:-Decrease in Voltage
D:-No Change in Voltage and Current
Ans: C
100:-Wien Bridge Oscillator Circuit uses
A:-Negative Feed Back
B:-Positive Feed Back
C:-Both Negative and Positive Feed Back
D:-None of the above
Ans: C
1:-In a hydroelectric power plant, the level of water stored in reservoir is known as ----
A:-Hydraulic head B:-Tail water level
C:-Headrace D:-Spillway level
Ans: C