Intelli Placement Paper Electrical Engineering Technical evaluation

Electrical Engineering – Sample Paper- Technical evaluation – EL

1) For successful parallel operation of DC generators, equalizer is required for:

A) Series generators only

B) Over-compounded generators only

C) Both series and over compounded generators

D) Series and under generators only

Answer: (C)

2) The z transform of (0.5) n sin (nΠ/2) u (n):

A) 1/ (z+1/4)

B) 2/ (4z+1)

c) 1/ (4+z-1)

d) 4/ (2z+1)

Answer: (D)

3) Hollow conductors are used in transmission lines to

A) increase bulk power transmission over very long distances

B) improve stability

C) reduce sag

D) reduce corona

Answer: (D)

4) A single phase full bridge inverter is fed from a DC source of 230V. Its commutating

components are L= 20 3H and C= 3F. the turn-off time of main SCR for a load current of

200A.

A) 239 (sec

B) 62.53 (

C) 80.93 (sec

D) 100 (sec

Answer: (B)

5) The function of using delta connected tertiary winding in a star-star transformer is:

i) To permit the flow of sufficient fault current for the operation of protective devices

ii) To permit the single phase loading

iii) To suppress harmonic voltages

iv) To provide low reactance path for zero sequence currents

From the above, the correct answer is:

A) i,ii,iii

B) i,ii,iv

C) ii,iii,iv

D) all

Answer: (D)

6) If Matrix A is of the order 3x4 and Matrix B is of order 4x5, the number of multiplication

operations and addition operations needed to calculate the matrix product AB is

A) 240, 60

B) 60, 45

C) 60, 60

D) 240, 32

Answer: (B)

7) In the case of HVDC system, there is:

A) Charging current but no skin effect

B) No charging current but skin effect

C) Neither charging current nor skin effect

D) Both charging current and skin effect

Answer: (C)

8) A minimum phase, feedback system has a Bode plot with a constant slope of -20

dB/decade for all frequencies. The maximum phase margin of the system is:

A) 0

B) 90

C) -90

D) 180

Answer: (C)

9) The instrument that does not have any restoring torque is:

A) D’Arsonval galvanometer

B) Flux meter

C) Ballistic galvanometer

D) MI instrument

Answer: (D)

10) In a single half wave circuit with RL load and a free wheeling diode across the load,

extinction angle β is more than Π. For a firing angle α, the SCR and free wheeling diode

would conduct for

A) Π – α, Π – β

B) Π - α, β – Π

C) β – α, Π – α

D) Π – α, β

Answer: (D)