**ISRO Interview Pattern for Scientist 2016.**

ISRO Interview Pattern for Scientist ME

I. Project Explanation

II. Fluid Mechanics:

i. Define laminar flow & Turbulent flow

ii. What is the value of Reynolds no in pipe flow

iii. What is the significance of Reynolds no

iv. Head losses in pipe

v. Define boundary layer in pipe flow & thickness of boundary layer

vi. What is the variation of δ in laminar & turbulent flow

III. Strength of materials

i. Draw the figure for spring damper system

ii. Differential equation for spring damper system

iii. Find out the deflection of spring damper system

iv. Define stiffness and unit of stiffness

IV. Material Science

i. Ferrous materials

ii. Non-ferrous materials

iii. Define fatigue

iv. Define fatigue resistance?

v. Curve for fatigue

vi. Fatigue limit

42) Which of the following are correct? 1. A flip-flop is used to store 1-bit of information 2. Race around condition occurs in JK flip flop when both the inputs are 1 3. Master slave flip flop is used to store 2 bits of information 4. A transparent latch consists of a D- flip flop a) 1, 2,3 b) 1,3,4 (ANS) c)1,2,4 d) 2,3,4

43) The bit rate of a QPSK compared to BPSK is a)half b) double c) same

44) There are 5 red balls and 5 black balls in a box. The probability to select 2 balls one after other without reputting is, a) 2/9 b) 1/90 c) 11/90 d) none

45) The rms voltage is obtained by multiplying peak by a factor a) 1/√2

46) H(s)=S/(S+a) is a transfer function of ______ a) LPF b) Notch c) BPF d) HPF

47) Resistance of a 2 parallel resistors is 12Ώ and the effective resistance when one resistor broke is 18Ώ then the value of resistance in another is_________

48)The output of a phase modulator when input applied is integrating signal is a)FM b) AM c) PM d) none

49) For a transformer the losses which vary with load are a) core losses b) copper losses c) Hysterises losses d) none.

50) The waves which cannot be transmitted in waveguide are a) TE b) TEM c) TM d) none 51) Diplexer is a a) circulator only b)only transmitter filter c) only receiver filter d) both transmitter and receiver filter

52) δ(t) represents impulse then ∫( δ(t) cos 2t )dt with limits 0 to infinity is a) 1, b) -1 c) infinity d ) 0 53) ∫1/(x√(x2-a2)) dx is A)cosec2x

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