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Q1. | In an ac circuit that delivers constant power at varying p.f., the current is |

A. | lowest when p.f. is leading [Wrong Answer] |

B. | lowest when p.f. is lagging [Wrong Answer] |

C. | lowest when p.f is unity [Correct Answer] |

D. | the same for all power factors [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒

**Assertion (A):** The h-parameter model of a BJT can be derived from its hybrid-p model and vice-versa.

**Reason (R):** The hybrid-p model has many more additional elements as compared to h-parameter model of the BJT.

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

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

A is true but R is false

A is false but R is true

⇒ In the signal flow graph of figure,

*y/x*equ

3

42857

2

None of the above

⇒ The transformer cores operating at microwave frequency ranges are generally made up of

silicon steel

ferrites

albino

super alloy

⇒ The scale factor for half wave and full wave rectifier is __________ respectively.

1.11, 1.414

1.11, 1.57

1.57, 1.11

1.414, 1.11

⇒ The theoretical power of white noise is

zero

finite

depend upon frequency of signal

infninite

⇒ A circular polarizer converts a linearly polarized wave into a circularly polarised wave.

TRUE

FALSE

⇒ The snubber circuit consists of

a capacitor connected in series with thyristor

a capacitor connected in parallel with thyristor

a resistor and capacitor in series connected across thyristor

none of the above

⇒ Modulation system used for video-modulation in television broadcast is

SSB AM with carrier

SSB with carrier suppressed

DSB AM with carrier

a modified form of SSB with carrier called vestigial sideband

⇒ Consider the amplitude modulated (AM) signal

*A*cos ω

_{c}*+ 2 cos ω*

_{c}t_{m}

*t*cos ω

*For demodulating the signal using envelope detector, the minimum value of A*

_{c}t_{c}should be

2

1

0.5

0

⇒ A 16 bit counter type ADC uses 1 MH

*z*clock then its maximum conversion time is __________ .

16 μ

*s*

15

*ms*

6.6

*ms*

66

*ms*

⇒ In free space, line of sight propagation case, the transmission losses between transmitter and receiver increase with frequency (

*f*) as

*f*

*f*

^{2}

*f*

^{4}

*f*

^{1/2}

⇒ For the compensator in the given figure the maximum phase lea

sin

^{-1}(1/3)

30°

45°

60°

⇒ A counter displays a sequence of numbers. If a reading corresponds to the hexadecimal number F52E, the next two readings are respectively

F52F, F520

F530, F531

F52F, F530

F52F, F52G

⇒

**Assertion (A):** In class A amplifier the distortion is minimum

**Reason (R):** In class A amplifier collector current exists for 360° of input cycle

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

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

A is correct R is wrong

A is wrong R is correct

⇒ The Table given below is the mark obtained by 2 students in 8 different subjec

*y*+ 0.57

*x*= 9.7558

*y*- 0.57

*x*= 9.758

033

*y*+

*x*= 6.335

0.33y -

*x*= 6.335

⇒ When a substance is repelled by a magnetic field it is known as

ferromagnetic

antiferromagnetic

diamagnetic

paramagnetic

⇒ Complex poles give rise to oscillatory terms in the response.

TRUE

FALSE

⇒ A memoryless source emits

*n*symbols each with a probability

*p*. The entropy of the source as a function of

*n*

increases as log

*n*

decreases as log (1/

*n*)

increases as

*n*

increases as

*n*log

*n*

⇒ In figure, V

_{1}= 40 V when R = 10 Ω, if R = 0, V

_{2}wil

40 V

30 V

20 V

10 V

⇒ In a 4 bit weighted resistor D/A converter, resistor value corresponding to LSB is 32 k ohm. The resistor value corresponding to MSB is

32 k ohm

16 k ohm

8 k ohm

4 k ohm

⇒ The circuit of figure is used to measure the value R

_{x}. Ammeter resistance R

_{a}= 0.1 Ω voltmeter resistance R

_{v}= 5000 Ω. It R

_{x1}and R

_{x2}, are the measured values of R

_{x}with switch in position 1 and 2, the mean of R

_{x1}, and R

_{x2},

9.98 Ω

10 Ω

10.04 Ω

10.1 Ω

⇒ Emitter follower is in which of following configuration.

common Base

common Emitter

common collector

common Base or common Emitter

⇒ The carriers of

*n*channel JFET are

free electrons and holes

holes

free electrons or holes

free electrons

⇒ Many circles are drawn in a Smith chart used for transmission line calculations. The circle shown in the figure represe

unit circles

constant resistance circles

constant reactance circles

constant reflection coefficient circles

⇒ For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

1000 MHz

5000 MHz

14000 MHz

140000 MHz

⇒ The gauge factor of a semiconductor strain gauge is about

2

10

100

1000

⇒ In register index addressing mode the effective address is given by

index register value

sum of the index register value and the operand

operand

difference of the index register value and the operand

⇒

Match the following:

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

A. | IF amplifier | 1. | Amplifier frequencies in the range of 100 kHz to 5 MHz. |

B. | RF amplifier | 2. | Current in the output flows only during a portion of the positive half of the input cycle |

C. | AF amplifier | 3. | Amplifier frequencies in the range of 0 Hz to 5 MHz |

D. | Class operation | 4. | Amplifier frequencies in the frequency range of 40 Hz to 15 kHz. |

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

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

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

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

⇒ Fourier transform is defined for

periodic

non-periodic

finite duration

all

⇒ If

*f*=0

X

_{L}= 0 and X

_{C}= 0

X

_{L}= ∞, X

_{C}= ∞

X

_{L}= 0 and X

_{C}= ∞

X

_{L}= ∞ and X

_{C}= 0