Technical Testpaper - Other - ISRO @ 22 Apr 2007 Delhi

paper was totally technical.Questions which i remembered are as follows:-
1) output resistance of ideal OP AMP is:-
a) 0 b) 1 c) infinite d) very high ANS: a) 0
2) waveguide acts as:-
a) LPF b) HPF c) BPF d) BRF ANS: b) HPF
3) quality factor of series RLC ckt. increases with:-
a) increase in R b) decrease in R c) doesn't depends on R d) none of these ANS: b) decrease in R.
4) energy stored in capacitor is given by:
a) CV b) 0.5CV c) CV2 d) 0.5CV2 ANS: d)
5) CMRR of an OP AMP is given as 80db and Ad is 20000.Value of Acm will be:-
a) 4 b) 8 c) 2 d) 1 ANS: c) 2
some basic questions were based upon digital electronics,ckt. analysis,antenna theory,zener doides.
1-SNR is defined as: 4 options.
2-To calculate the number of RAMchips for a given one: 4 options
3-The correct value of COS(A) in terms of exponential: 4 options
4-A figure to represent which kind of Flipflop: 4 options
5-A prob. on adder with shift register to identified no. of clock used to show the output (ie1010) 4options
6-Three questions were asked on Zener Diode to evaluate variable resirance,min. passing current & variable supplied voltage. 4 options
7- A problem on line to which passes thru point (-1,2) and making equal intercepts on both axis: 4 options
8-Transformer core requried 4 options with high permiability & low hysteris losses etc. like difft. values
9-To evaluate the prob. to get either of 2 color balls in a bag containg 6 red & 8 black balls 4 options
10-A wire length 2m having restiance 5 ohms, what will be the resitance if its length bcome 2 fold: 4options
Some more problems---
1) Vander wal's equation (We have to pick up the right answer from four choices)
2)To a heat engine a constant heat is supplied at 300kJ at 290 C and heat is rejected at 8.5 C. What is the heat rejected?
Ans : 150kJ
3)What is shrinkage allowance?
The dimensional allowance which must be made in molds to compensate for shrinkage of the plastic compound on cooling
4)Where spining operation is done?
Lathe
5) What is the maximum height of a siphon?
6)Time bound varying material is called?
7)There are two bodies, one with high mass another with low mass. Both are having same kinetic energy. Their momentum will be?
a) Both the momumtum will be equal b) Body of large mass will have high momentum. c)b) Body of low mass will have high momentum d)It depends uopn the velocities
8)Ratio of kinetic energies of two bodies is 1 : 4, The what is the ratio of their momentum?
9)What is the notch angle of izod impact test?
10) For a given nozzle angle and number of rows in the turbine, what is the optimum blade speed ratio?
11) A question on manometer with diagram
12) Two reservoirs are connected by a pipe of diameter D. Due to the chemical deposition the diameter is reduced by 20%. Neglect the frictional losses. How will the discharge will vary?
13)Around 10 questions on very basics of Matrices, Eigen values, Laplace.
14)A question on the position of metacenter
15) Match the following on Reynolds, weber, prandtl no
16) Problem on bulk modulus
17)What is the total volume change in a cylinderical vessel if strain e1 acts along longitudinal and stain e2 acts along tangential direction?
18)A question on belt friction
19)A turbine of periperal velocity V is designed for 100m head. what will be the periperal velocity of a turbine if the head is 800m?