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August 5th, 2016, 03:25 PM
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Join Date: Mar 2012
Re: ISRO Electrical Question Papers

As you want here I’m giving you ISRO Electrical Question Papers:

ISRO is invited candidates for various posts. ISRO has various Question Papers of:

Subject Stream:

Electronics Engineering
Electrical Engineering
Computer Science Engineering
Mechanical Engineering
A/c & Refrigeration
Civil Engineering

Here I’m attaching PDF of ISRO Electrical Question Papers:


ISRO Electrical Questions:

1. The energy stored in the magnetic field in a solenoid of length 30cm and
diameter 3cm wound with 1000 turns of wire & carrying a current of 10A is
a) 0.015 joules.
b) 0.15 joules.
c) 0.5 joules.
d) 1.15 joules

2 . A network is said to be linear, if and only if
a) The response is proportional to the excitation function.
b) The principle of superposition applies.
c) The principle of homogeneity applies.
d) The principles of superposition and homogeneity apply.

3 . Kirchoff's law fails in the case of
a) Non-linear networks.
b) Linear networks.
c) Dual networks.
d) Distributed parameter networks

4. In a four branch parallel circuit, 50mA current flows in each branch. If one of
the branches opens, the current in other branches
a) Increase, but not double.
b) Decrease.
c) Unaffected.
d) Double.

5. The wave length of a wave in a waveguide is
a) is greater than in free space
b) depends only on the waveguide dimensions and the free-space wavelength
c) is inversely proportional to the phase velocity
d) is directly proportional to the group velocity

6. Characteristic impedance of a quarter wave transformer connected in
between a load of 100 ohm and a transmission line of characteristic
impedance 225 ohms is
a) 100 ohm
b) 225 ohm
c) 600 ohm
d) 150 ohm


7. A transverse electromagnetic wave with circular polarization is received by
a dipole antenna due to polarization mismatch. The power transfer efficiency
from the wave to the antenna is reduced to about
a) 50%
b) 35.5%
c) 25%
d) 0%

8. The unit of displacement density of a magnetic circuit is
a) Coulomb / metre
b) Coulomb / sq. metre
c) Newton - cm
d) Amp / metre

9. The derivative of an ideal step function is
a) an impulse function
b) zero
c) sine function
d) undefined

10. An impulse function consists of
a) entire frequency range with same relative phase
b) infinite bandwidth with linear phase variation
c) pure DC
d) large DC with weak harmonics

11. The discrete time system described by y(n) = x(n2) is
a) causal, linear and time varying
b) causal, nonlinear and time varying
c) non-causal, linear and time invariant
d) non-causal, non linear and time variant

12. What does the transfer function of a system describe for the system?
a) only zero input response
b) only zero state response
c) both zero input and zero state response
d) neither zero input response nor zero state response

13. Which of the following measures cannot be effective in reducing the noise?
a) reduction in signaling rate
b) increase in transmitted power
c) increase in channel bandwidth
d) use of redundancy

14. Which among the following type of transformer have smallest size with
same electrical specification ?
a) ONAN type transformer.
b) Dry type transformer.
c) ONAF type transformer.
d) OFWF type transformer.

15. Two transformers operating in parallel will share the load depending upon
their ?
a) Ratings.
b) Leakage reactance.
c) Efficiency.
d) Per unit impendence.

16. Transformer core is laminated,
a) because it is difficult to fabricate solid core.
b) because laminated core provides high flux density.
c) to avoid eddy current and hysteresis losses.
d) to increase the main flux.

17. The eddy current losses in the transformer will be reduced if ?
a) The laminations are thick.
b) Number of turns in the primary winding is reduced.
c) The number of turns in the secondary winding is reduced.
d) The laminations are thin.

18. The Buchholz relay is used to protect the ?
a) Alternators against all internal faults.
b) Oil immersed transformers against all internal faults.
c) Synchronous motors against all internal faults.
d) Transmission lines against all short circuit faults.

19. Why are transformer stamping annealed before being used for the building?

a) to reduce eddy-current loss due to burning of edges
b) to reduce hysteresis loss due to burning of edges
c) to give mechanical strength to the core
d) to increase core permeability

20. As compared to ∆ – ∆ bank, the capacity of the V –V bank of transformers
is ---- percent.
a) 57.7
b) 66.7
c) 50
d) 86.6
Attached Files
File Type: pdf ISRO Electrical Question Papers.pdf (69.4 KB, 191 views)


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