Sample Questions Electrical Engineering Basede on Actual Questions of UPSC IAS
Engineering Question UPSC based on Real Question Papers
IAS Prelims Papers Free online solved Questions of Electrical Engineering
1. In India, the maximum frequency deviation in commercial FM broadcasting signals is about
(a) 5 kHz
(b) 15 kHz
(c) 75 kHz
(d) 200 kHz
Ans:-B
2. If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be increased by a factor of
(a) √2
(b) 2
(c) 4
(d) 8
Ans:-A
3. For any amplifier configuration using a BJT, the input Impedance R i is
(a) h i (l + h fe )
(b) h i / (1—h r Av)
(c) h i / (1+h r Av)
(d) h i / (1 + h fe )
Ans:-B
4. The range of numbers that can be represented in two’s complement mode with four binary digits is
(a) —15 to +15
(b) —8 to + 8
(c) —8 to +7
(d) —7 to +7
Ans:-A
5. Cycle time of a Random Access Memory is the time required between successive
(a) accesses to memory
(b) clocks
(c) delete operations
(d) Read / Write operations
Ans:-A
6. The INTEL 8080 microprocessors has a set of 91 Instructions. The op-code to Implement this Instruction set should be of at least
(a) 6 bits
(b) 4 bits
(c) 7 bits
(d) 8 bits
Ans:-C
7. Consider the following assembly language code for a simple computer having one register only:
LOAD X
ADD Y
STORE T1 STORE T2
MULT Z MULT T1
ADD T2 STORE R
Which one of the following arithmetic expressions does it evaluate?
(a) R:Z2(1+X+Y)2
(b) R:Z2(X+Y)2+(X+Y)
(c) R:=Z(X+Y)2+(X+Y)2
(d) R:=Z(X+Y)2+(X+Y)
Ans:-D
8. Consider the following statements regarding a ‘smart’ terminal:
1. It is a minimal system containing almost no memory.
2. It contains a small microcomputer or minicomputer.
3. It permits text editing.
4. It enables checking of typing errors made by operators.
Which of these statements are correct?
(a) 1, 2 and 3
(b) 1, 2 and 4
(c) 2, 3 and 4
(d) 1, 3 and 4
Ans:-C
9. The unit step response of a second order linear system with zero initial states is given by c (t) = 1 + 1.25 exp (— 6t) sin (8t — tan-1 1.333), t ≥ 0.
The damping ratio and the undamped natural frequency of oscillation of the system are respectively
(a) 0.6 and l0 rad/s
(b) 0.6 and l2.5 rad/s
(c) 0.8 and l0 rad/s
(d) 0.8 and 12.5 rad/s
Ans:-A
10. Type of a system depends on the
(a) number of its poles
(b) difference between the number of poles and zeros
(c) number of its real poles only
(d) number of poles it has at the origin
Ans:-D
11. The final value of function F(s) = 5 / s (s 2 + s + 2)
is equal to
(a) zero
(b) 2 / 5
(c) 5/2
(d) 5
Ans:-C
12. Consider the following statements:
1. P-D controller is equivalent to a high pass filter.
2. For better performance, integral action s initiated before derivative action.
3. High proportional gain is an alternative to derivative action.
4. A practical PID controller uses a high gain amplifier in the forward path.
Which of these statements are NOT correct?
(a) 1, 2 and 4
(b) 2, 3 and 4
(c) 2 and 3
(d) l and 4
Ans:-C
13. In measuring the distributed capacitance ‘C d’ of a certain coil using Q-meter, initial resonance at frequency 2 MHz is obtained by tuning the capacitance set to 430pF. If resonance at 4MHz is obtained by tuning the capacitance set to 100 pF, then the value of ‘C d’ would be
(a) 10 pF
(b) 20 pF
(c) l00 pF
(d) 200 pF
Ans:-A
14. Match List I (Measurements). with List II (Transduction principles) and Select the correct answer using the codes given below the Lists:
List I
A. rpm
B. Temperature
C. Static pressure
D. Current
List II
1. Variable resistance
2. Hall effect
3. Piezoelectric effect
4. Variable reluctance
5. Variable capacit4nce
Codes:
A B C D
(a) 4 1 5 2
(b) 1 4 5 2
(c) 2 1 3 5
(d) 4 1 2 3
Ans:-A
15. A resistance strain gauge with a gauge factor of 2 is fastened to a steel member subjected to a stress of 10.5 x 10’ kN/m2. The modulus of elasticity of steel is 2.1 x k N /m2. The change of resistance due to stress in the strain gauge is
(a) 0.1%
(b) 0.2%
(c) 1%
(d) 10%
Ans:-A
16. How many comparators are there In an ADC with 0— 5V Input and 8 bit output assuming a flash converter?
(a) 5
(b) 8
(c) 40
(d) 255
Ans:-D
17. The ratio of the electrical resistance of a material at 300 K to Its electrical resistance at 4 K is 5.
This material could be
(a) an intrinsic semiconductor
(b) an extrinsic semiconductor
(c) an insulator
(d) a conductor
Ans:-D
18. In a ferromagnetic material, the magnetic field is Increased gradually from zero. The first process which sets in the material to give net magnetization is the
(a) growth of favourable oriented domains at
the cost of other domains by reversible domain wall movement
(b) growth of favourable oriented domains at the cost of other domains by irreversible domain wall movement
(c) alignment of domain walls with the grain boundaries
(d) rotation of domains in the direction of the applied field.
Ans:-C
19. For the epitaxial growth of material M to be possible on the substrate of material N,
(a) the lattice constants of M and N must be same
(b) M and N must not react with each ‘other
(c) the coefficients of thermal expansion of M and N must be equal
(d) M must have a lower density than N
Ans:-A
20. Silicon nitride is used as the cover layer in MOS technology because it is
(a) easy to deposit
(b) resistant to oxidation
(c) an excellent barrier to alkali ions
(d) an excellent mask for gallium
Ans:-B
