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Q1. | A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters |

A. | are common [Correct Answer] |

B. | are separate [Wrong Answer] |

C. | are generally common [Wrong Answer] |

D. | are generally separate [Wrong Answer] |

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

⇒ A 1 ms pulse can be converted into a 10 ms pulse by using which one of the following

An astable multivibrator

Stable multivibrator

A bistable multivibrator

A J-K flip-flop

⇒ Two voltages 50 V each have a phase difference of 45°. The rms value of resultant sum of the two voltages is

70.7 V

80.4 V

92.4 V

100 V

⇒ Power received from Sun per m

^{2}surface area of a geosynchronous satellite in nearly __________ watt.

100

500

2000

1000

⇒ In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

0.25 Hz

0.5 Hz

1.25 Hz

1 Hz

⇒ The three sides of an admittance triangle denote

G, B, Y

R, X, Y

G, B, Z

(R, Y, Z) or (R, X, Z)

⇒ A d.c. power supply has an open circuit voltage of 100 V. When the full load current is drawn, the output drops to 80 V. The percentage voltage regulation is

0.9725

0.75

0.5

0.25

⇒ Two phasors having rms values V

_{1}and V

_{2}which are added to give a phasor having rms value V

_{3}. V

_{3}is maximum if phase angle between V

_{1}and V

_{2}is

90°

180°

270°

360°

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Evanescent wave | 1. | Pattern multiplication |

B. | Skip distance | 2. | Mismatched transmission line |

C. | Return loss | 3. | Propagation in lossy medium |

D. | Antenna array | 4. | Short wave propagation |

5. | Propagation below cut-off |

A-5, B-2, C-4, D-3

A-2, B-4, C-1, D-5

A-5, B-4, C-2, D-1

A-1, B-3, C-4, D-5

⇒ The resonance frequency is

ω

_{r}=

*a*

ω

_{r}=

*b*

ω

_{r}=

*k*

ω

_{r}=

*ba*

⇒ Magnetic susceptibility of a medium is the ratio of

magnetic field strength to mmf

intensity of magnetization to magnetic flux density

intensity of magnetization to field strength

mmf to magnetic field strength

⇒ Output of a phase splitter is

a pair of sine waves of unequal amplitude

a pair of sine waves of equal amplitudes

a pair of sine waves of equal amplitudes and opposite phase

a pair of sine waves of unequal amplitudes and opposite phase

⇒ In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

when power factor is less than 0.5 lagging

when power factor is greater than 0.5 lagging

when power factor is less than 0.5

when power factor is unity

⇒ A rare gas having N atoms/m

^{3}is subjected to an electric field E. The electric dipole moment per unit volume is proportional to N and E.

TRUE

FALSE

⇒ Which of these commutation methods uses an external pulse for commutation?

Class A

Class C

Class E

Class F

⇒ The forbidden energy gap between the valence band and conduction band will be least in case of

metals

semiconductors

insulators

all of the above

⇒ A memory chip has 65536 cells in it. Then

time required to access cell is same as that to access cell 65536

time required to access cell is less than that required to access cell 65536

time required to access cell is more than that required to access cell 65536

either (a) or (b)

⇒ A FM signal with modulation index M

*is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of*

_{f}M

_{f}

M

*/2*

_{f}2M

_{f}

UM

_{f}

⇒ Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.

28000

15000

36000

11100

⇒ In the given fi

42737

42739

2

1

⇒ To select one out of N equally probable events, the number of bits required is

log

_{2}N

log

_{10}N

log

_{e}N

N

⇒ What will be the propagation constant at 10 MHz?

3.4 radians/km

34.4 radians/km

344 radians/km

3440 radians/km

⇒ The numerical value of directive gain may lie between

1 and + 1

0 and 1

0 and ∞

1 and ∞

⇒ A series RLC circuit has a resonant frequency of 2000 Hz. The maximum voltage across C is likely to occur at a frequency of about

1000 Hz

4000 Hz

2025 Hz

1975 Hz

⇒ A multivibrator can be used as a

cavity resonator

harmonic generator

wave form modifier

any of the above

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Output of signal generator | 1. | Modulated |

B. | Error signal from a synchro | 2. | Digital |

C. | Output of a JK flip flop | 3. | Analog |

D. | Signal received by radar | 4. | Stoichastic |

A-1, B-3, C-2, D-4

A-3, B-1, C-2, D-4

A-3, B-1, C-4, D-2

A-1, B-3, C-4, D-2

⇒ Broadcasting antennas are generally

omnidirectional type

vertical type

horizontal type

helical

⇒ Which of these are two state devices?

Lamp

Punched card

Magnetic tape

All of the above

⇒ To measure an emf by dc potentiometer it is necessary to standardise the potentiometer with the help of a standard cell.

TRUE

FALSE

⇒ Given below impulse response of two sys

*h*

_{1}(

*n*) non causal and stable

*h*

_{1}(

*n*) non causal and stable

*h*

_{1}(

*n*) causal and not stable

*h*

_{1}(

*n*) causal and stable

⇒ The function shown in figure, can represent a probability density function for A _______

A = 1/4

A = 1/6

A = 1/9

A = 1/2