End Test Now
Two free parallel wires carrying current in the opposite directions
Attract each other
Repel each other
Do not effect each other
Get rotated to be perpendicular to each other
All the magnetic materials looses their magnetic property when
Dipped in water
Dipped in oil
Brought near piece of iron
Strongly heated
Potassium paramagnet is used for
Dechlorination
Improving colour
Reducing acidity
Reducing hardness
Which of the following material has the highest carbon percentage?
Cast iron
Mild steel
High carbon steel
Stainless steel
Which of the following paints is most fire resistant
Bituminous paint
Asbestos paint
Aluminum paint
Synthetic paint
The gas which is mainly responsible for the explosion in sewers is
Methane
Ethane
Ammonia
Carbon- monoxide
The Wind screen of car made of
Sheet glass
Wired glass
Laminated glass
Flint glass
Which of the welding process is used for welding of structures?
Gas welding
Fusion welding
Thermic welding
Arc welding
In a d.c generator, following losses will be minimum
Copper loss
Iron loss
Friction loss
Shunt field copper loss
Corona loss is less when the shape of the conductor is
Circular
Flat
Oval
Independent of shape
The core of the transformer is assembled with laminated sheet so as to reduce
Hysteresis loss
Magnetic noise
Eddy current loss
Which of the following instrument is used for measuring the rate of flow of liquid of pipes
Hydro meter
Venturi meter
Viscometer
Falter pump
The proper use of lubricants cannot reduce
Static friction
Inertia
Sliding friction
Rolling friction
Infra red radiation can be detected by
Spectrometer
Pyrometer
Nanometer
Photometer
Which of the following is used in optical fibers
Total internal reflection
Scattering
Diffraction
Refraction
Metal attains super- conduction properties below the temperature of
0 deg K
100 deg C
100 deg K
10 deg K
Powder clinges to the skin because of following property
Adhesion
Cohesion
Surface tension
Capillary action
The sparking at the brushes in the d.c generator is attributed to
Quick reversal of current
Reactance voltage
Armature reaction
High resistance of the brushes
D.C series motor should always be started with load because
At no load it will rotate at dangerously high speed
At no load it will not develop high starting torque
It cannot start without load
It draw a small amount of current at no load
A tunnel diode is
High resistivity p-n junction diode
A slow switching device
An amplifying device
A very heavily doped p-n junction diode
The effective channel length of a MOSFET in saturation decreases with increase in
Gate voltage
Drain voltage
Source voltage
Body voltage
The ON voltage and forward breakover voltage of an SCR depends on the
Gate current alone
Band gap of the semiconductor alone
Gate current and the semiconductor band gap respectively
Semiconductor bandgap and the gate current respectively
Negative feedback in amplifier
Improves the signal to noise ratio at the input
Improves the signal to noise ratio at the output
Does not affect the signal to noise ratio at the output
Reduce the distortion.
An ideal Op- Amp is an ideal
Voltage controlled current source
Voltage controlled voltage source
Current controlled current source
Current controlled voltage source
One of the following types of noise becomes of great importance at high frequencies. It is the
Shot noise
Random noise
Impulse noise
Transit- time noise
Piezoelectricity effect is the polarization of a dielectric under the influence of
Light
Mechanical stress
Electrical stress
Heat
Entropy of mixture of two gases after sudden mixing is
Greater than
Less than
Same as sum of entropy of individual gases
Unpredictable
If air filter is removed in a petrol engine, the air/fuel ratio will
Increase
Decrease
Increase and decrease
Remains unchanged
In a two stage compression , inter -cooling is used for
Reducing work of compression in the first stage
Reducing temperature in the first stage
Reduced work in the second stage
Reducing work and temperature in the second stage
Which component of refrigeration system controls the flow of refrigerant
Expansion valve
Condenser
Compressor
Evaporator
Laser beam welding has widest application in
Mass production in heavy industry
Jobbing industry
Electronic industry
Structure and bridge work
In Equation x-2y+3z=0 and 2x+5y+3z=0, y equals
0
1
2
3
If a system of equation has one or more solution it is called
Compatible
Consistent
Homogeneous
Simultaneous
In a microprocessor the register which holds the address of the next instruction to be fetched is
Accumulator
Program counter
Stack pointer
Instruction register
The mnemonics used in writing a program is called
Assembly language
Fetch cycle
Microinstruction
Object program
For which of the following devices, is DMA the most suitable
Keyboard
Mouse
Joy stick
Hard stick
In real time operating system, which of the following is the most suitable scheduling scheme?
Round robin
First come first served
Random scheduling
Preemptive
In client – server system , data is usually stored on the
Server
Client
Network
None of the above
Identify the natural
LISP
PROLOG
Both (a) and (b)
Neither (a) and (b)
An interrupt that can temporarily ignored by the counter is known as
Vectored interrupt
Non – maskable interrupt
Maskable interrupt
Low priority interrupt
Binary means…..........
Three
Four
Two
None of the above.
The digits used in a binary systems are …….. and ……....
9 and 0
0 and 1
1 and 2
The hexadecimal number system is widely used in analyzing and programming
Registers
Chips
Microprocessors
The hexadecimal digits are 0 to 9 and A to…........
E
F
G
Which of the following input combinations is not allowed in an SR flip-flop?
S = 0, R = Q
S = 0, R=l
S=l, R=l
When an inverter is placed between both inputs of an SK flip-flop, the resulting flip-flop is
JK flip-flop
D flip-flop
Master slave JK flip-flop
The clock signals are used in sequential logic circuits
To tell the time of the day
To tell how much time has elapsed since the system was turned on
To synchronize events in various parts of a system
What logic function is obtained by adding an inverter to the output of an AND gate?
OR
NAND
XOR
The simplified form of the Boolean expression (X + Y+XY) (X + Z) is
X+Y+Z
XY+YZ
X+YZ
The 1’s compliment of binary number 11010 is:
00101
00010
00110
The TWO’s compliment of binary number 0.01011 is :
1.10101
0.10101
1.10100
A half-adder is also known as:
AND circuit
NOR circuit
EX-ORcircuit
The register which contains the instruction that is to be executed is known as
Index register
Instruction registers
Memory address register
The input unit of a computer
Feeds data to the CPU or memory
Processor and I/O devices
Directs all other units
Which of the following is used as storage location both in the ALU and the control section of a computer?
Register
Adder
One of the main feature that distinguish microprocessors from micro-computers is
Words are usually larger in micro-processors
Words are shorter in micro-processors
Microprocessor does not contain I/O devices
The process of fetching and executing instructions, one at a time, in the order of increasing addresses is known as
Instruction execution
Straight line sequencing
Instruction fetches
The ALU of a computer normally contains a number of high speed storage elements called
Semiconductor memory.
Registers.
Hard disk.
The process of executing several programms simultaneously by use of more than one processing unit is known as:
Multi programming.
Multiprocessing.
Time sharing.
The programme which is run on one computer and which initiates the operation of another computer is known as
compiler.
Interpreter.
Simulator.
The system which permits a large number of users at various remote terminals to simultaneously use a centrally located computer is known as
Servomechanism system.
Time sharing system.
Mainframe system.
A software programme stored in a ROM that cannot be changed easily is known as
Hardware.
Linker
firmware.
Which of the following operating systems use write through cache?
UNIX
DOS
ULTRIX
The operating system manages
Memory.
Processor.
Disk and I/O devices.
All of the above.
Situations where two or more processes are reading or writing some shared data and final result depends on who runs precisely are called
Race conditions.
Critical sections.
Mutual sections.
Part of a programme where the shared memory is accessed and which should be executed indivisibly, is called
Semaphores.
Mutual Exclusion.
Critical section.
Non-modifiable procedures are called
Serially usable procedures.
Top down procedures.
Re-entrant procedures.
Round robin scheduling is essentially the preemptive version of
FIFO.
Shortest job first.
Shortest remaining time.
In C programming language, which of the following types of operators have the highest precedence?
Relational operators.
Equality operators.
Arithmetic operators
In C programming language, which of the following type of operators have the highest precedence
Arithmetic operators.
In C programming language, if the first and the second operands of operator + are of types int and float, respectively, the result will be of type
Int
Float
char
In C programming language, how many parameters can be passed to a function ?
one
two
As many parameters as are defined in the function definition
none of the above
In a Network Sending a bad routing information (like network unreachable) back to the originating router is called
Split horizon
Route Poisoning
Reverse poisoning
In order to route data packets a router must know which of the following?
Possible routes to all remote networks
Neighbor routers from which it can learn about remote networks
Destination Address
All of these
An example of a malicious program that needs a host program is
Logic Bomb
Worm
Bug
None of these.
The resultant of a force acting on a body will be zero if the body
Rotate with uniform deceleration
Rotate with uniform acceleration
Does not rotate
Rotates
The movement of a force
Occurs about a point
Measures the capacity to do useful work
Occurs only when bodies are in motion
Measures the ability to produce turning or twisting about an axis
After reaching the yielding stage while testing a mild steel specimen strain
Becomes constant
Strain start decreasing
Increasing without any increase in load
Non of the above
Volumetric strain for a rectangular of length L, breadth B, and thickness T subjected to a pull of P is given by
e (1-2m)
e (1-2/m)
e (m-2)
e (2/M-1)
The mechanism used in petrol engine is
Crank mechanism
Slider mechanism
Slider crank mechanism
Natural lines and circular
M 10 screws have a pitch of
0.5 mm
1.25 mm
2.50 mm
5.00 mm
A coarse screw of major diameter 6.00 mm and pitch is designated as
1×6M
Coarse M 6
M 6
6Mx6×1
Longitudinal vibration are set to occur when the particles of a body moves.
Perpendicular to its axis
Parallel to its axis
In a circle about its axil
None of these
A mass of 1 Kg is attached to the end of a sprig with stiffness 0.7 N/mm.. The critical damping coefficient of the system is
1.40 Ns/m
18.522 Ns/m
52.92 Ns/m
529.20 Ns/m
An ideal fluid is
Similar to a perfect gas
Friction less and incompressible
One which obeys Newtons laws of viscosity
One which satisfies continuity equation
One which flows through pipes with least friction
The stress Strain relation of the Newtonian fluids is
Linear
Parabolic
Hyperbolic
Involutic
The Reynolds No. may be defined as the ration of
Viscous forces to inertial forces
Elastic forces to pressure forces
Viscous forces to gravity forces
All heat transfer processes
Involve transfer of energy
Involve temperature difference between the bodies
Obeys the first law of the thermodynamics
Obeys second law of thermodynamics
Which insulating material is a suitable low temperature application?
Cork
Asbestos paper
Diatomaceous earth
85 % magnesia
A heat exchanger that can remove fix quantity of heat form a system is available where should it be installed for best economy
Prior to first stage compression
As intercooler
After final stage compression
Depends upon size of installation
The performance of air compressor at high altitudes as compared to that at sea level will be
Better
Same
Inferior
Will depend upon temperature of air
Which is incorrect?
Compression ration= Initial volume +final Volume
Final pressure= Initial Pressure x Compression ration
Initial pressure= Final pressure+Compression ration
During adiabatic compression
No heat leaves or enters the system
Maximum work is done
Specific heat remains constant
Temperature remains constant
In multistage turbines by introducing reheating
Thermal efficiency improves
The output of turbine increases
Work done by compressor reduces
The ratio compressor work/turbine decreases
In Jet engine the compression ration
Varies with altitude
Varies with square of speed
Varies as cube of speed
remains constant
An axial flow compressor has
Larger blade at gas entry and smaller blades at exit
Smaller blade at gas entry and larger blades at exit
Identical blades at exit as well as entry
Size of blades remains same only angles changes
An axial flow compressor is suitable for
High volume flow rates with a small pressure rise
High volume flow rate with high pressure rise
Low volume flow rates with low pressure rise
Low volume flow rates with high pressure rise
Thermal efficiency of a gas turbine cycle can be improved by
Reheating between the expansion stage
Intercooling between compression stages
Regeneration
Any of the above
Gas turbine used in aircraft is of
Open cycle type
Closed cycle type with reheating
Closed cycle type with reheating and regeneration
Open cycle type with reheating, regeneration and intercooling
In a nozzle under choked flow conditions pressures waves travel, in the divergent portion, at
Subsonic speed
Sonic speed
Super sonic
Subsonic to supersonic speed
In a nozzle if back pressure is equal to inlet pressure
No flow occurs
Maximum flow occurs
Flow is subsonic in diverging section
Flow is supersonic in convergent section as well as supersonic section
The flow on two sides of a normal shock wave is
Subsonic
Sonic
Supersonic
Supersonic on one side and subsonic on the other side
The diverging portion of the nozzle acts as a diffuser for
Subsonic flow
Supersonic flow
Both the subsonic as well as supersonic flow
Identify the correct statement
All materials undergo plastic deformation
A completely brittle material would not fracture at elastic limit
Brittleness is an important engineering consideration, because it allows the material to be redistribute localize stresses.
A metal which is brittle in tension may be ductile under hydro static compression
The defect responsible for the phenomenon of slip by which most metals deform plastically, is known as
Fracture
Twining
Dislocation
Strain hardening
Fatigue failure occurs when a part is subjected to
Tensile stress
Compressive stress
Torsion
Fluctuating stress
Stress concentration occurs when
A body is subjected to excessive stress
A body is subjected to unidirectional stress
A body is subjected to fluctuating stress
A body is subjected to non uniform stress distribution
Stress concentration may be caused by
Change in cross sectional area
Change in shape
Change in dimension
A hole or a notch in the body
The inability of a body to change its state of rest or uniform motion along a straight line is called
Momentum
Velocity
Acceleration
A material subjected to reversal of stresses does not fail at a stress known as
fatigue stress
Proof stress
Safe stress
Endurance stress
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