# Ericsson Placement Paper - January 2012

Posted on :23-02-2016
Ericsson Placement Paper - January 2012:-

Q1. In a MOS capacitor with n-type silicon substrate, the Fermi potential = -0.41 V and the flat-band voltage Vfb = 0V. The value of the threshold voltage Vt is:

a) -0.82 V
b) -0.41 V
c) 0.41 V
d) 0.82

Q2. In a P-well fabrication process, the substrate is

a) N-type semiconductor and is used to build P-channel MOSFET
b) P-type semiconductor and is used to build P-channel MOSFET
c) N-type semiconductor and is used to build N-channel MOSFET
d) P-type semiconductor and is used to build N-channel MOSFET

Q3. The electric field component of a uniform plane wave propagating in a loss less magnetic dielectric medium is given by E(t,z)=ax 5cos(10^9 t-20/3 z)V/m. If 0 represents the intrinsic impedance of the free space, the corresponding magnetic field component is given by

a) H(t,z)= ay 5/2 -0 cos(10^9t - 20/3 z)A/m
b) H(t,z)= ay 10/ -0 cos(10^9t - 20/3 z)A/m
c) H(t,z)= az 5/2 -0 cos(10^9t - 20/3 z)A/m
d) H(t,z)= az 10/ -0 cos(10^9t - 20/3 z)A/m

Q4. Let En and Ep, respectively, represent the effective Fermi levels for electrons and holes during current conduction in a semiconductor. For lasing to occur in a P-N junction of band-gap energy 1.2 eV, (En - Ep) should be

a) greater than 1.2eV
b) less than 1.2eV
c) equal to 1.1eV
d) equal to 0.7eV

Q5. Negative resistance characteristics is exhibited by a

a) Zener diode
b) Schottky diode
c) photo diode
d) Tunnel diode

Q6. Ajit invested Rs 35000 for 8 months and Manjit invested Rs 42000 for 10 months. On a profit of Rs 31570 Ajit share is?

ANS: Rs.12628

Q7. What is the output of the following program?

int *px;
do{
*px=f(1);
} while( i<10 && *px<900);
f(int a)
{
int x= a*50;
return &x;
}

Q8. If the sides of a square is increased by 25%, what will be the percentage increase in the area?

ANS: 56.25%

Q9. If 12 men shakes hand from each other then what will be the total number of hand shakes?

ANS: 66

Q10. One quality of wheat Rs.9.30 per kg is mixed with another quality of wheat Rs. 10.80 per kg then what will be the ratio in which they must be mixed so that the net cost is Rs. 10 per kg?

ANS: 8:7

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