# The function f(x) = 2x-x2 - x3+3 has

1.  a maxima at x = 1 and minimum at x = 5

2.  a maxima at x = 1 and minimum at x = -5

3.  only maxima at x = 1 and

4.  only a minimum at x = 5

4

only maxima at x = 1 and

Explanation :
No Explanation available for this question

# A lossy capacitor Cx, rated for operation at 5 kV, 50 Hz is represented by an equivalent circuit with an ideal capacitor Cp in parallel with a resistor RP. The value Cp is found to be 0.102 µF and the value of Rp = 1.25 MΩ. Then the power loss and tan  of the lossy capacitor operating at the rated voltage, respectively, are

1.  10 W and 0.0002

2.  20 W and 0.025

3.  10 W and 0.0025

4.  20 W and 0.04

4

10 W and 0.0025

Explanation :
No Explanation available for this question

# Let the Laplace transform of a function F(t) which exists for t > 0 be F1(s) and the Laplace transform of its delayed version f(1-τ ) be F2(s). Let F1*(s) be the complex conjugate of F1(s) with the Laplace variable set as s= σ + jw. If G(s) = , then the inverse Laplace transform of G(s) is

1.  An ideal impulse δ( t)

2.  An ideal delayed impulse δ( t -τ)

3.  An ideal step function u (t)

4.  An ideal delayed step function u (t -τ)

4

An ideal delayed impulse δ( t -τ)

Explanation :
No Explanation available for this question

# A zero mean random signal is uniformly distributed between limits -a and +a and its mean square value is equal to its variance. Then the r.m.s value of the signal is

1.  a/√3

2.  a/√2

3.  a√2

4.  a√3

4

a/√3

Explanation :
No Explanation available for this question

# A 220 V, DC shunt motor is operating at a speed of 1440 rpm.The armature resistance is 1.0Ω and armature current is 10A,of the excitation of the machine is reduced by 10%,the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

1.  1.79 Ω                   (B) 2.1 Ω                     (C) 18.9 Ω                      (D) 3.1 Ω

2.  2.1 Ω

3.  18.9 Ω

4.  3.1 Ω

4

1.79 Ω                   (B) 2.1 Ω                     (C) 18.9 Ω                      (D) 3.1 Ω

Explanation :
No Explanation available for this question

# A load center of 120MW derives power from two power stations connected by 220kV transmission lines of 25km and 75km as shown in the figure below. The three generators G1,G2 and G3 are of 100MW capacity each and have identical fuel cost characteristics. The minimum loss generation schedule for supplying the 120 MW load is

1.  P1=80MW+losses P2=20MW P3=20MW

2.  P1=60MW P2=30MW+losses P3=30 MW

3.  P1=40 MW P2=40 MW  P3=40 MW+losses

4.  P1=30 MW+losses P2=45 MW P3=45 MW

4

P1=80MW+losses

P2=20MW

P3=20MW

Explanation :
No Explanation available for this question

# The open loop transfer function G(s) of a unity feedback control system is given as G(s)= From the root locus,it can be inferred that when k tends to positive infinity,

1.  Three roots with nearly equal real parts exist on the left half of the s-plane

2.  One real root is found on the right half of the s-plane

3.  The root loci cross the jω axis for a finite value of k; k ≠ 0

4.  Three real roots are found on the right half of the s-plane

4

Three roots with nearly equal real parts exist on the left half of the s-plane

Explanation :
No Explanation available for this question

# A portion of the main program to call a subroutine SUB in an 8085 environment is given below. : : LXID, DISP LP: CALL SUB     : It is desired that control be returned to LP+DISP+3 when the RET instruction is executed in the subroutine. The set of instructions that precede the RET instruction in the subroutine are

1.  POP D DAD H PUSH D

2.  POP  H DAD  D INX   H INX   H INX   H PUSH  H

3.  POP   H DAD   D PUSH  H

4.  XTHL INX   D INX   D INX   D XTHL

4

POP   H

PUSH  H

Explanation :
No Explanation available for this question

# The transistor used in the circuit shown below has a p of 30 and ICBO is negligible   If the forward voltage drop of diode is 0.7V, then the current through collector will be

1.  168 mA

2.  108 mA

3.  20.54mA

4.  5.36 mA

4

5.36 mA

Explanation :
No Explanation available for this question

# A voltage commutated chopper circuit, operated at 500Hz, is shown below. If the maximum value of load current is 10A, then the maximum current through the main (M) and auxiliary (A) thyristors will be

1.  iM max= 12A and iA max = 10A

2.  iM max = 12A and iM max = 2A

3.  iM max = 10A and iA max = 12A

4.  iM max = 10A and iA max = 8A

4