Correct Answer: D
Explanation:
Explanation:
6
Correct Answered:
Wrong Answered:
1. What is the multiplying power of a shunt resistance of 200 Ohm when used with a galvanometer of 1000 Ohm resistance?
A
4
B
3
C
9
D
6
6
Correct Answered:
Wrong Answered:
2. When a steady current is passed through a ballistic galvanometer, then the deflection will be
A
Zero
B
The current passing through it
C
twice the normal value as it depends on Hibbert`s magnetic standard
D
None of the above
Zero
Correct Answered:
Wrong Answered:
3. Match the two lists and choose the correct answer from the code given below:
List-I (Instrument) List-II (Error) (w) PMMC voltmeter (i) Eddy current error (x) AC ammeter ii) Phase angle error (y) Current transformer iii) Braking system error (z) Enérgy męter iv) Temperature error Choose the correct option
A
(w)- (iv), (x)-(iii), (y)-(ii), (z)-(i)
B
(W)- (iv), (x)-(i), (y)-(ii), (z)-(iii)
C
(w)-(iv), (x)-(iii), (y)-(i), (z)-(ii)
D
(w)- (ii), (x)-(iv), (y)-(i) (z)-(iii)
(w) PMMC voltmeter → sensitive to temperature variations because the copper coil resistance changes.
✅ (iv) Temperature error
(x) AC ammeter (moving iron / dynamometer type) → has errors due to inductance of the coil, which causes a phase shift between current and flux.
✅ (ii) Phase angle error
(y) Current transformer (CT) → introduces phase angle error and ratio error, but the most standard classification here is phase angle error.
✅ (ii) Phase angle error (✔️ check if duplication allowed — usually CT = phase angle error)
(z) Energy meter → uses an eddy-current-based braking system; errors arise due to this.
✅ (iii) Braking system error
Correct Answered:
Wrong Answered:
4. Which of the following materials is used in the fabrication ofthe swamping resistance of a PMMC instrument?
A
Copper
B
Tungsten
C
Aluminium
D
Manganin
Manganin
Correct Answered:
Wrong Answered:
5. Why does a moving iron meter require more power to operate than a PMMC meter? Is it due to the high magnetic circuit _______
A
Resistanc
B
Retentivity
C
Reluctance
D
Resilience
Reluctance
Correct Answered:
Wrong Answered:
6. Which one of the following compensations is adopted for improving transient response of a negative unity feedback system?
A
Phase lead compensation.
B
Phase lag compensation
C
Gain compensation
D
Both phase lag compensation and gain compensation
Phase lead compensation
Correct Answered:
Wrong Answered:
7. For making an unstable system stable
A
gain of the system should be increased
B
gain of the system should be decreased
C
the number of zeros in the loop transfer function should be increased
D
the number of poles in the loop transfer function should be increased
gain of the system should be decreased
Correct Answered:
Wrong Answered:
8. The steady state error due to a ramp input for a type two system is equal to
A
Zero
B
Infinite
C
non-zero number
D
constant
Zero
Correct Answered:
Wrong Answered:
9. A unity feedback system has open-loop transfer function G(s). The steady-state error is zero for
A
step input and type-1 G(s)
B
ramp input and type-1 G(s).
C
step input and type-0 G(s).
D
ramp input and type-0 G(s).
step input and type-1 G(s)
Correct Answered:
Wrong Answered:
10. Consider the following statements regarding the advantages of closed-loop negative
feedback control-systems over open-loop systems:
I. The overall reliability of the closed-loop systems is more than that of open-loop system.
II. The transient response in the closed-loop system decays more quickly than in open loop system.
III. In an open-loop system, closing of the loop increases the overall gain of the system. IV. In the closed-loop system, the effect of variation of component parameters on its performance is reduced. Of these statements:
A
I and III are correct
B
I and II are correct
C
II and IV are correct
D
III and IV are correct
I. The overall reliability of the closed-loop systems is more than that of open-loop system.
❌ False → Open-loop is structurally simpler and often more reliable (fewer components). Closed-loop is more accurate but less reliable due to complexity.
II. The transient response in the closed-loop system decays more quickly than in open-loop system.
✅ True → Negative feedback improves damping, reduces overshoot, and speeds up settling.
III. In an open-loop system, closing of the loop increases the overall gain of the system.
❌ False → Negative feedback actually reduces the overall gain, but improves accuracy and stability.
IV. In the closed-loop system, the effect of variation of component parameters on its performance is reduced.
✅ True → One of the main advantages of negative feedback.
Correct Answered:
Wrong Answered:
11. Which ofthe following is NOT valid in case ofsignal flow graph?
A
in signal flow graph signals travel along branches only in the marked direction
B
nodes are arranged from right to left in a sequence
C
signal flowgraph is applicable to linear systems only
D
for signal flow graph, the algebraic equations must be in the form of cause-and-effect relationship.
nodes are arranged from right to left in a sequence
Correct Answered:
Wrong Answered:
12. Which of the following are the characteristics of closed-loop systems?
I. It does not compensate for disturbances.
II. It reduces the sensitivity of plant-parameter variations.
III. It does not involve output measurements.
IV. It has the ability to control the system transient response.
Select the Answer using the codes given below:
A
I and IV
B
II and IV
C
I and III
D
II and III
I. It does not compensate for disturbances.
❌ False → Closed-loop does compensate for disturbances using feedback.
II. It reduces the sensitivity of plant-parameter variations.
✅ True → One main advantage of closed-loop systems.
III. It does not involve output measurements.
❌ False → Closed-loop requires output measurement for feedback.
IV. It has the ability to control the system transient response.
✅ True → Feedback can shape transient response (overshoot, settling time, etc.).
Correct Answered:
Wrong Answered:
13. Feedback control systems are
A
Insensitive to both forward-and feedback-path parameter changes
B
Less sensitive to feedback-path parameter changes than to forward-path parameter changes
C
Less sensitive to forward-path parameter changes than to feedback-path parameter changes. Less sensitive to forward-path parameter changes than to feedback-path parameter changes.
D
Equally sensitive to forward and feedback-path parameter changes.
Less sensitive to forward-path parameter changes than to feedback-path parameter changes.
Correct Answered:
Wrong Answered:
14. Which one of the following is open loop?
A
The respiratory system of man
B
A system for controlling the movement of the slide of a copying miling machine
C
A thermostatic control
D
Traffic light control
Traffic light control
Correct Answered:
Wrong Answered:
15. In a resistive circuit,a voltage source is defined as V= 4i where i is the current through a 2 Ohm resistor. If the power supplied by the source is 32W, what is the value of i?
A
2 A
B
2.83 A
C
8 A
D
16 A
2.83A
Correct Answered:
Wrong Answered:
16. Which theorem requires that linearity is strictly followed, but bilateral nature is not mandatory?
A
Thevenin`s Theorem
B
Bio Savart Law
C
Maximum Power Transfer
D
Reciprocity Theorem
Thevenin's Theorem
Correct Answered:
Wrong Answered:
17. A dielectric is inserted between capacitor plates while the capacitor remains connected to a battery. What happens to the electric field inside?
A
Increases
B
Remains unchanged
C
Infinity
D
Becomes Zero
Remains unchanged
Correct Answered:
Wrong Answered:
18. Which of the following statements is false regarding electric field lines?
A
Field lines never intersect
B
Field lines originate on positive charges and terminate on negative
C
The number of lines is proportional to magnitude
D
Field lines form closed loops
A) Field lines never intersect → ✅ True (if they did, field direction would be ambiguous).
B) Field lines originate on positive charges and terminate on negative → ✅ True.
C) The number of lines is proportional to magnitude → ✅ True (denser lines = stronger field).
D) Field lines form closed loops → ❌ False (that’s true for magnetic field lines, not electric).
Correct Answered:
Wrong Answered:
19. In a purely inductive AC circuit, the current:
A
Leads the voltage
B
Lags the voltage by 90°
C
Is in phase with voltage
D
Is zero
Lags the voltage by 90°
Correct Answered:
Wrong Answered:
20. If a conductor is placed in an electrostatic field, the field inside the conductor is:
A
Equal to the external field
B
Infinite
C
Zero
D
Non-zero and uniform
Zero
Correct Answered:
Wrong Answered:
21. Thevenin's theorem replaces a linear circuit with:
A
A current source and capacitor
B
A voltage source and series resistance
C
An inductor and resistor
D
A current source and parallel resistance
A voltage source and series resistance
Correct Answered:
Wrong Answered:
22. The divergence of a constant vector field is:
A
Zero
B
Infinite
C
Equal to the field itself
D
One
Zero
Correct Answered:
Wrong Answered:
23. Kirchhoff's current law KCL states that:
A
The total voltage around a closed loop is always zero.
B
The resistance in a circuit remains constant.
C
The sum of power across all elements in a circuit
D
The algebraic sum of currents entering a node or a closed boundary is zero.
The algebraic sum of currents entering a node or a closed boundary is zero.
Correct Answered:
Wrong Answered:
24. What is the basic unit of Luminous intensity?
A
Candela
B
Kelvin
C
Conductanc
D
Coulombs
Candela
Correct Answered:
Wrong Answered:
25. The reciprocal of resistance is:
A
Voltage
B
Current
C
Conductance
D
Coulombs
Conductance
Correct Answered:
Wrong Answered:
26. A network has 12 branches and 8 independent loops. How many nodes are there in the network?
A
19
B
5
C
17
D
4
5
Correct Answered:
Wrong Answered:
27. The voltage 2,000,000 V can be expressed in powers of 10 as:
A
2 mV
B
2 kV
C
2 MV
D
2 GV
2 MV
Correct Answered:
Wrong Answered:
28. Which lamp has the best Colour Rendering Index (CRI)?
A
LED
B
Fluorescent
C
Incandescent
D
High pressure sodium vapour
Incandescent
Correct Answered:
Wrong Answered:
29. Impulse ratios of insulators and lightning arresters should be
A
High and low, respectively
B
Both low
C
Low and high, respectively
D
Both high
High and low, respectively
Correct Answered:
Wrong Answered:
30. Mho relay is usually employed for the protection of:
A
Short transmission lines only
B
Long transmission only
C
Medium transmission lines only
D
Any transmission line
Long transmission only
Correct Answered:
Wrong Answered:
31. The making current of a 3-phase circuit breaker rated at 2000 MVA and 33 kV will be approximately:
A
35 kA
B
59 kA
C
89 kA
D
69 kA
89 kA
Correct Answered:
Wrong Answered:
32. Match the two lists and choose the correct answer from the code given below: List-I (Phenomenon) List-II (Dominant features) (w) Voltage stability (i) Power system stabilizer (x) Transient stability (ii) Damping power (y) Oscillafory instability (iii) 'Angle' stability (z) Steady-state dynamics (iv) Reactive power Choose the correct option
A
(w)-(i), (x)-(ii), (y)-(iv), (z)-(iii)
B
(w)-(iii), (x)-(iv), (y)-(ii), (z)-(i)
C
(w)-(iii), (x)-(i), (y)-(ii), (z)-(iv)
D
(w)-(iv), (x)-(iii), (y)-(ii), (z)-(i)
(w) Voltage stability → (iv) Reactive power
(x) Transient stability → (iii) Angle stability
(y) Oscillatory instability → (ii) Damping power
(z) Steady-state dynamics → (i) Power system stabilizer
Correct Answered:
Wrong Answered:
33. In which of the following 3-phase transformer connection configurations will zero-sequence currents not flow through the transformer windings?
A
Primary in star, neutral not grounded; secondary in delta
B
Primary in star, neutral grounded; secondary in delta
C
Primary in star, neutral not grounded; secondary in star, neutral grounded
D
Primary in star, neutral grounded; secondary in star,neutral not grounded
Primary in star, neutral not grounded; secondary in delta
Correct Answered:
Wrong Answered:
34. An element in a power system has positive, negative, and zero sequence reactances of 0.3, 0.3, and 0.9, respectively. This element is most likely to be a:
A
Synchronous generator
B
Transmission line
C
Static load
D
Synchornous motor
Transmission line
Correct Answered:
Wrong Answered:
35. If a line-to-ground fault results in a fault current of 100 A in the affectedphase, whatwill,5 be the corresponding zero-sequence current?
A
0 A
B
33.3 A
C
66.6 A
D
100 A
33.3 A
Correct Answered:
Wrong Answered: