PrepMart

Explanation

Manganin

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Question ID: 9668

Question 5 of 273

$Why does a moving iron meter require more power to operate than a PMMC meter? Is it due to the high magnetic circuit _______$

Explanation

Reluctance

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Question ID: 9667

Question 6 of 273

$Which one of the following compensations is adopted for improving transient response of a negative unity feedback system?$

Explanation

Phase lead compensation

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Question ID: 9666

Question 7 of 273

$For making an unstable system stable$

Explanation

gain of the system should be decreased

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Question ID: 9665

Question 8 of 273

$The steady state error due to a ramp input for a type two system is equal to$

Explanation

Zero

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Question ID: 9664

Question 9 of 273

$A unity feedback system has open-loop transfer function G(s). The steady-state error is zero for$

Explanation

step input and type-1 G(s)

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Question ID: 9663

Question 10 of 273

$Consider the following statements regarding the advantages of closed-loop negative feedback control-systems over open-loop systems: I. The overall reliability of the closed-loop systems is more than that of open-loop system. II. The transient response in the closed-loop system decays more quickly than in open loop system. III. In an open-loop system, closing of the loop increases the overall gain of the system. IV. In the closed-loop system, the effect of variation of component parameters on its performance is reduced. Of these statements:$

Explanation

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.

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Question ID: 9662

Question 11 of 273

$Which ofthe following is NOT valid in case ofsignal flow graph?$

Explanation

nodes are arranged from right to left in a sequence

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Question ID: 9661

Question 12 of 273

$Which of the following are the characteristics of closed-loop systems? I. It does not compensate for disturbances. II. It reduces the sensitivity of plant-parameter variations. III. It does not involve output measurements. IV. It has the ability to control the system transient response. Select the Answer using the codes given below:$

Explanation

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.).

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Question ID: 9660

Question 13 of 273

$Feedback control systems are$

Explanation

Less sensitive to forward-path parameter changes than to feedback-path parameter changes.

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Question ID: 9659

Question 14 of 273

$Which one of the following is open loop?$

Explanation

Traffic light control

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Question ID: 9658

Question 15 of 273

$In a resistive circuit,a voltage source is defined as V= 4i where i is the current through a 2 Ohm resistor. If the power supplied by the source is 32W, what is the value of i?$

Explanation

2.83 A

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Question ID: 9657

Question 16 of 273

$Which theorem requires that linearity is strictly followed, but bilateral nature is not mandatory?$

Explanation

Thevenin's Theorem

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Question ID: 9656

Question 17 of 273

$A dielectric is inserted between capacitor plates while the capacitor remains connected to a battery. What happens to the electric field inside?$

Explanation

Remains unchanged

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Question ID: 9655

Question 18 of 273

$Which of the following statements is false regarding electric field lines?$

Explanation

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).

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Question ID: 9654

Question 19 of 273

$In a purely inductive AC circuit, the current:$

Explanation

Lags the voltage by 90°

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Question ID: 9653

Question 20 of 273

$If a conductor is placed in an electrostatic field, the field inside the conductor is:$

Explanation

Zero

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Question ID: 9652

Question 21 of 273

$Thevenin's theorem replaces a linear circuit with:$

Explanation

A voltage source and series resistance

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Question ID: 9651

Question 22 of 273

$The divergence of a constant vector field is:$

Explanation

Zero

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Question ID: 9650

Question 23 of 273

$Kirchhoff's current law KCL states that:$

Explanation

The algebraic sum of currents entering a node or a closed boundary is zero.

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Question ID: 9649

Question 24 of 273

$What is the basic unit of Luminous intensity?$

Explanation

Candela

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Question ID: 9648

Question 25 of 273

$The reciprocal of resistance is:$

Explanation

Conductance

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Question ID: 9647

Question 26 of 273

$A network has 12 branches and 8 independent loops. How many nodes are there in the network?$

Explanation

5

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Question ID: 9646

Question 27 of 273

$The voltage 2,000,000 V can be expressed in powers of 10 as:$

Explanation

2 MV

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Question ID: 9645

Question 28 of 273

$Which lamp has the best Colour Rendering Index (CRI)?$

Explanation

Incandescent

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Question ID: 9644

Question 29 of 273

$Impulse ratios of insulators and lightning arresters should be$

Explanation

High and low, respectively

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Question ID: 9643

Question 30 of 273

$Mho relay is usually employed for the protection of:$