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Q1. | In integral cycle control the period of on-off control should be more than mechanical time constant of load. |

A. | TRUE [Wrong Answer] |

B. | FALSE [Correct Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Measurement of an unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when

the primary circuit battery is changed

standardization has to be done again to compensate for drifts

voltage is larger than range of the potentiometer

range reduction by a factor of 10 is employed

⇒ A voltage wave

*v*= 10 + 20 sin ω

*t*+ 7.5 sin 3 ω(

*t*) is applied to a series combination of two elements. The current is

*i*= 5 sin (ω

*t*+ 20°) + 1.5 sin (3ω

*t*+ 10°). The elements are

R and C

R and L

L and C

both inductances

⇒ If X = 2.5 and Y = 2.5, which of the following expressions would give the result as 5/7?

X + 2.5 / Y + 3.0

(X + 2.5) / Y + 4.5

(X + 2.5) / (Y + 4.5)

(X + 2.5) / Y + 3.5

⇒

**Assertion (A):** Wien bridge can be used for measuring frequency.

**Reason (R):** A frequency meter for 50 Hz system has a frequency range of 40 to 60 Hz.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true R is false

A is false R is true

⇒ The cut in voltage

is the same for silicon and germanium diodes

is a forward voltage

is a reverse voltage

is a forward voltage below which the current is very small

⇒ In a three phase series inverter, the firing frequency is

three times output frequency

six times output frequency

twice the output frequency

equal to output frequency

⇒ Indicate the false statement: If SWR on a transmission line is infinite, the line is terminated in

open circuit

short circuit

pure reactance

complex impedance

⇒ A band elimination constant

*k*filter has series resonant circuit in series arms.

TRUE

FALSE

⇒ Consider the following statements as regards noise

- If Gaussian noise is applied at input of a rectifier, the output is not gaussian
- The noise encountered on a telephone line consists of short, pulse type disturbances whose amplitude distribution is not Gaussian
- Shot noise results from random emission of electrons from a cathode
- Shot noise results from phenomenon associated with the flow of current across semi conductor junctions

1, 2, 3, only

1, 2, 4 only

1, 2, 3, 4

2, 3 only

⇒ Silicon and germanium atoms combine orderly into array of atoms located in repetitive geometric pattern. This pattern is called

crystal

covalent bond

molecule

valence bond

⇒ For the transport lag G(

*j*ω) =

*e*

^{-jωT}, the polar plot is

a semi circle

a circle

a unit circle

none of the above

⇒ A super heterodyne receiver has a IF of 465 kHz. It is tuned to a station broadcasting at 500 KHz and its oscillator is operating at 965 KHz, then the 1330 KHz frequency would be

adjacent channel frequency

image frequency

gyro frequency

maximum usable frequency

⇒ Generally op amp is used in

open loop

closed loop

cascaded loop

either (a) or (c)

⇒ In a parallel resonant circuit, the circuit current at resonance is maximum.

TRUE

FALSE

⇒ In a series R-L circuit when excited by a 1 volt battery the current is 1 -

*e*

^{-t}. If it is excited by a source 2 sin

*t*, the current will be

2 sin (

*t*- 45°) +

*e*

^{-t}

2 sin (

*t*+ 45°) +

*e*

^{-t}

sin (

*t*- 45°) +

*e*

^{-t}

sin (

*t*+ 45°) +

*e*

^{-t}

⇒ Consider the following statements as regards communication receiver

- Variable sensitivity is used to eliminate selective fading
- A product demodulator can be used to receive Morse code
- The noise limiter cuts off receiver output during a noise pulse
- Double conversion is used to improve image rejection

1, 2, 3, 4

1, 2, 3

2, 3, 4

1, 3, 4

⇒ The feedback resistance r

_{d}in small signal model of MOSFET is of the order of

1000 MΩ

1 MΩ

1 KΩ

100 Ω

⇒ The magnitude plot of a composite signal

*x(t)*=

*e*

^{3jt}+

*e*

^{4jt}is __________ .

Half wave rectified sinusoid

Full wave rectified sinusoid

Exponentially increasing sinusoid

Exponentially decreasing sinusoid

⇒ Good frequency stability can be available

crystal oscillators

Hartley oscillators

colpitts oscillators

none of the above

⇒ A relaxation oscillator uses

tunnel diode

UJT

both tunnel diode and UJT

PIN diode

⇒ Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz

6.28

62.8

8

0

⇒

**Assertion (A):** SSB transmitter is generally smaller than AM transmitter

**Reason (R):** SSB systems mostly use combined transmitter receiver.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒

**Assertion (A):** In KVL equations involving mutually coupled circuits the sign of M terms can be positive or negative.

**Reason (R):** Dot convention helps in determining sign of M terms in KVL equations.

Both A and R are true and R is correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ Consider the following statements :

- Tellegen's theorem is applicable to any lumped networks.
- The reciprocity theorem is applicable to linear bilateral networks.
- Thevenin's theorem is applicable to two- terminal linear active networks.
- Norton's theorem is applicable to two-terminal linear active networks.

1, 2, and 3

1, 2 and 4

1, 2, 3 and 4

3 and 4

⇒ Fourier series is applicable for

periodic

finite duration

non periodic

a and b

⇒ The chemical effect of current is used in

dc ampere hour meter

dc ammeter

ac energy meter

all of the above

⇒ Consider the real expression in Pascal language

`XZ and MP + K`

`XZ + Y and MP + K`

`(MP + K + X) / Y `

`Y / (MP + K)`

⇒ For the system with given characteristic equat

3, 2, 0

4, 0, 1

3, 0, 2

4, 1, 0

⇒ In a 3 phase system, the zero sequence component of line to line voltages is zero

if line to line voltages are balanced

if line to line voltages are unbalanced

if line to line voltages are balanced or unbalanced

if degree of unbalanced in line to line voltages is small

⇒ The gain of an half wavelength antenna is

2.15 dB

10 dB

1.78 dB

100 dB