NPCIL Solution

Hello, I want to give the exam of the instrumentation of the NPCIL and I want the papers of the exam with solution.

[Kiran Chandar]

Hello, here I am providing you the questions of the previous exams of the instrumentation of the NPCIL as under:

1) Special softZare to create a job queue is called
a) driver
b) spooler
c) interpreter
d) linkage editer
2)When a process is rolled back as a result of deadlock the difficulty
arises is
a) Starvation
b) System throughput
c) low device utilization
d) cycle stealing
3)On recieving an interrupt from an I/O device the CPU
a) Halts for a predefined time.
b) Branches off the interrupt service routine after completion off the
current instruction.
c) Branches off to the interrupt service routine immediately.
d) hands over the control of address bus and data bus to the
interrupting service.
4) Which of the following is true of the auto increment addressing
mode?
1. It is useful in creating sef relocating code.
2)If it is induced in an instruction set architecture , than an additional
ALU is required for effective address calculation.
3) The amount of increment depends on the size of the data item
accessed.
a) 1 only.
b)2 only
c) 3 only
d) 2 and 3 only
5) Theprimary purpose of an operating system is
a) to make the most efficient use of the computer hardware.
b) to allow people to use the computer.
c) to make the system programmers employed.
d) to make computers easy to use.
6)consider the cpu intensive processes which require 10,20,30 time
units and arrive at time 0,2,6 respectively.how many context switches
are needed if the operating system impements a shortest remaining
time first sceduling algorithm?Do not count the context switches at the
time 0 and end.
a) 1
b) 2
c) 3
d) 4
7) consider a system having n resources of the same type.These
resources are shared by 3 processes A,B,C .These have peak
demands of 3,4,6 respectively.For what value of n deadlock won’t
occour.
a) 15
b) 9
c) 10
d) 13
In which addressing mode the effective address of the operand is computed by adding a constant value to the content of the register?
a) absolute mode.
b) indirect mode
c) immediate mode
d) index mode
9)the process of organizing the memory into two banks to allow 16 bit
and 8 bit data operation is called
a) bank switching
b) indexed mapping
c) two way memory interleaving
d) memory segmentation
10)a one dimensional array A has indices 1-75.Each element is a string
and takes up three memory words. The array is stored in location 1120
decimal. The starting address of A[49] is
a) 1267
b) 1164
c) 1264
d) 1169
11) The microsystems stored in the control memory of a processor have
a width of 26 bits. Each microinstruction is divided into three fields : a
microoperation field of 13 bits, a next address field(X), and a MUX select
field(Y). There are 8 status bits in the inputs of the MUX.How many bits
are there in the X and Y fields and what is the size of the control
memory in number of words?
a) 10,3,1024
b) 8,5,256
c) 5,8,2048
d) 10,3,512
12)The use of multiple register windows with overlap causes a reduction
in the number of memory accesses for
1.function locals and parameters
2. register saves and restores.
3. instruction fetches.
a) 1 only
b) 2 only
c) 3 only
d) 1,2,and 3
13)Which of the following about relative addressing mode is false?
a) it enables reduced instruction size.
b) it allows indexing of array element with same instruction.
c) it enabkles easy relocation of data.
d) it enables faster address calculation than absulute addressing.
14)Substitution of values for names (whose values are constants) is
done in ‘
a) local optimization
b) loop optimization
c) constant folding
d) strength reduction
15)A root a of eq f(x)=0 can be computed to any degree of accuracy if a
good initial approximation x0
is chosen for which
a) f(x0)>0
b) f(x0)f”(x0)>0
c) f(x0)f”(x0)<0
d) f”(x0)>0

NPCIL instrumentation papers:

(1) Instrument is a device for determining
(a) the magnitude of a quantity
(b) the physics of a variable
(c) either of the above
(d) both (a) and (b)

(2) Electronic instruments are preferred because they have
(a) no indicating part
(b) low resistance in parallel circuit
(c) very fast response
(d) high resistance in series circuit
(e) no passive elements.

(3) A DC wattmeter essentially consist of
(a) two ammeters
(b) two voltmeters
(c) a voltmeter and an ammeter
(d) a current and potential transformer

(4) Decibel is a unit of
(a) power
(b) impedance
(c) frequency
(d) power ratio

(5) A dc voltmeter may be used directly to measure
(a) frequency
(b) polarity
(c) power factor
(d)power

(6) An accurate voltmeter must have an internal impedance of
(a) very low value
(b) low value
(c) medium value
(d) very high value

(7) The insulation resistance of a transformer winding can be easily measured with
(a) Wheatstone bridge
(b) megger
(c) Kelvin bridge
(d) voltmeter

(8) A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of
(a) 10%
(b) 5%
(c) 2.5%
(d) 1.25%

(9) You are required to check the p. f. of an electric load. No p.f. meter is available. You would use:
(a) a wattmeter
(b) a ammeter, a voltmeter and a wattmeter
(c) voltmeter and a ammeter
(d) a kWh meter

(10) The resistance of a field coil may be correctly measured by using
(a) a voltmeter and an ammeter
(b) Schering bridge
(c) a Kelvin double bridge
(d) a Maxwell bridge

(11) An analog instrument has output
(a) Pulsating in nature
(b) Sinusoidal in nature
(c) Which is continuous function of time and bears a constant relation to its input
(d) Independent of the input quantity

(12) Basic charge measuring instrument is
(a) Duddel’s oscillograph
(b) Cathode ray oscillograph
(c) Vibration Galvanometer
(d) Bailastic Galvanometer
(e) Battery Charging equipment

(13) A.C. voltage can be measured (using a d.c. instrument) as a value obtained
(a) by subtracting the d.c. reading from it’s a.c. reading.
(b) Using the output function of the multimeter
(c) By using a suitable inductor in series with it
(d) By using a parallel capacitor with it
(e) None of the above

(14) A moving coil permanent magnet ammeter can be used to measure
(a) D. C. current only
(b) A. C. current only
(c) A. C. and D. C. currents
(d) voltage by incorporating a shunt resistance
(e) none of these

(15) Select the wrong statement
(a) the internal resistance of the voltmeter must be high
(b) the internal resistance of ammeter must be low
(c) the poor overload capacity is the main disadvantage of hot wires instrument
(d) the check continuity with multimeter, the highest range should be used.
(e) In moving iron voltmeter, frequency compensation is achieved by connecting a capacitor across its fixed coil.

(16) Which of the following instrument is suitable for measuring both a.c. and d.c.quantities.
(a) permanent magnet moving coil ammeter.
(b) Induction type ammeter.
(c) Quadrant electrometer.
(d) Moving iron repulsion type ammeter.
(e) Moving iron attraction type voltmeter.

(17) Swamping resistance is used in moving coil instruments to reduce error due to
(a) thermal EMF
(b) temperature
(c) power taken by the instrument
(d) galvanometer sensitivity.

(18) A power factor meter is based on the principle of
(a) electrostatic instrument
(b) Electrodynamometer instrument
(c) Electro thermo type instrument
(d) Rectifier type instrument.

(19) A potentiometer recorder is used for
(a) AC singles
(b) DC signals
(c) both (a) and (b)
(d) time varying signals
(e) none of these.

(20) Transformers used in conjunction with measuring instruments for measuring purposes are called
(a) Measuring transformers
(b) transformer meters
(c) power transformers
(d) instrument transformers
(e) pulse transformers.

(21) Leakage flux in an electrical machine is measure by
(a) Ballistic galvanometer
(b) Flux meter
(c) Either (a) or (b)
(d) Vibration galvanometer
(e) CRO

(22) A C.R.O. is used to indicate
(a) supply waveform
(b) magnitude of the applied voltage
(c) B.H. loop
(d) all of these
(e) Magnitude of the current flowing in it.

(23) An oscillator is a
(a) an amplifier having feedback network
(b) a high gain amplifier
(c) a wide band amplifier
(d) a untuned amplifier
(e) None of these

(24) Distortion can be measured by
(a) Wave meter
(b) Digital filters
(c) Wein bridge circuit
(d) Bridge T filter circuit

(25) Series connected Q- meter is preferable for measurement of components having
(a) high impedance
(b) low impedance
(c) both (a) and (b)
(d) high frequency
(e) low capacitance