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WorksheetsTechincal_Recruitment 2021-22
Total questions: 40
Worksheet time: 20mins
What is the divergence of the given vector field at the point (1, 2, 3)?
80
89
124
100
The Gauss divergence theorem converts
line to surface integral
line to volume integral
surface to line integral
surface to volume integral
How will you free the allocated memory ?
remove(var-name);
free(var-name);
delete(var-name);
dalloc(var-name);
What is the similarity between a structure, union and enumeration?
All of them let you define new values
All of them let you define new data types
All of them let you define new pointers
All of them let you define new structures
What will be the output of the program ?
#include<stdio.h>
int main()
{
struct value
{
int bit1:1;
int bit3:4;
int bit4:4;
}bit={1, 2, 13};
printf("%d, %d, %d\n", bit.bit1, bit.bit3, bit.bit4);
return 0;
}
1, 2, 13
1, 4, 4
-1, 2, -3
-1, -2, -13
Study the given program. If "abcdefg" is the input, the output will be
abcd
abc
efg
Garbage
A pointer is a memory address. Suppose the pointer variable has p address 1000, and that p is declared to have type int*, and an int is 4 bytes long. What address is represented by expression p + 2?
1002
1004
1006
1008
Study the following array definition: int num[10] = {3, 3, 3};
Which of the following statement is correct?
num[9] is the last element of the array num
The value of num[8] is 3
The value of num[3] is 3
None of the above
What is the output of the following C program?
empty string=10
C=basics
Cbasics=10
Compiler error
Local variables are stored in an area called ___________
Heap
Permanent storage area
Free memory
Stack
What will be the output of the following C code?
x is 97
x is 98
x is 99
Run time error
What will be the output of the following C code?
4
5
Compile time error
3
In C language, FILE is of which data type?
int
char *
struct
None of the mentioned
What is meant by ‘a’ in the following C operation?
fp = fopen("Random.txt", "a");
Attach
Append
Apprehend
Add
What is the principle of fibre optical communication?
Frequency modulation
Population inversion
Total internal reflection
Doppler Effect
Which of the following has more distortion?
Single step-index fibre
Graded index fibre
Multimode step-index fibre
Glass fibre
Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and 1.5 respectively.
0.55677
55.77
0.2458
0.647852
The fibers mostly not used nowadays for optical fiber communication system are ___________
Single mode fibers
Multimode step fibers
Coaxial cables
Multimode graded index fibers
How does a semiconductor behave at absolute zero?
Conductor
Insulator
Semiconductor
Protection device
What type of material is obtained when an intrinsic semiconductor is doped with trivalent impurity?
Extrinsic semiconductor
Insulator
N-type semiconductor
P-type semiconductor
How many junction/s do a diode consist?
0
1
2
3
If the voltage of the potential barrier is V0. A voltage V is applied to the input, at what moment will the barrier disappear?
V< V0
V= V0
V> V0
V<< V0
What will be the output of the following circuit? (Assume 0.7V drop across the diode)
12V
12.7V
11.3V
0V
Which of the following expressions represents the correct distribution of the electrons in the conduction band?
(gc(E)=density of quantum states, fF(E)=Fermi dirac probability)
n(E)=gc(E)*fF(E)
n(E)=gc(-E)*fF(E)
n(E)=gc(E)*fF(-E)
n(E)= gc(-E)*fF(-E)
In which of the following semiconductor, the concentration of the holes and electrons is equal?
Intrinsic
Extrinsic
Compound
Elemental
For a half wave or full wave rectifier the Peak Inverse Voltage of the rectifier is always
Greater than the input voltage
Smaller than the input voltage
Equal to the input voltage
Greater than the input voltage for full wave rectifier and smaller for the half wave rectifier
For the circuit shown below, find the PIV of the diode
√2
Vs
Vm
√2 Vm
Which region of the transistor is highly doped?
Emitter
Base
Collector
Both Emitter and Collector
Which junction is forward biased when transistor is used as an amplifier?
Emitter-Base
Emitter-Collector
Collector-Base
No junction is forward biased
From the figure, what is βac when VCE is 10V and Ic is 4 mA?
50
100
150
200
Which of the following correctly determines the relation between α and β?
β=α/(1-α)
α=β/(1-α)
β=α/(1-β)
β=α*(1-β)
For a BJT, for common base configuration the input characteristics are represented by a plot between which of the following parameters?
VBE and IE
VBE and IB
VCE and IC
VCC and IC
Field effect transistors are different from BJTs in that they are _________
monopolar devices
bipolar devices
bidirectional device
none of the mentioned
FET is a current controlled device
True
False
For a p-channel FET, What is the direction of current flow?
Source to drain
Drain to source
Gate to source
Gate to drain
To use FET as a voltage controlled resistor, in which region it should operate?
Ohmic region
cut off
Saturation
cut off and saturation
What is the generalized value for the voltage across resistor RB1 in a unijunction transistor?
VRB1 = (RB2 / RB1 + RB2) × VBB
VRB1 = (RB2 / RB1 – RB2) × VBB
VRB1 = (RB1 / RB1 + RB2) × VBB
VRB1 = (RB1 / RB1 – RB2) × VBB
What is the intrinsic stand-off ratio(η) of a unijunction transistor when RB1 = 10kΩ and RBB = 15kΩ?
0.67
0.55
0.80
0.44
What are the working regions of a unijunction transistor?
a) Linear region
b) Negative Resistance region
c) Saturation region
d) Cut-off region
Find the Laplace transform of e-at sinωt u(t)
