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Q1. | A UPS contains |

A. | rectifier [Wrong Answer] |

B. | inverter [Wrong Answer] |

C. | either rectifier or inverter [Wrong Answer] |

D. | both rectifier and inverter [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ The opposition of an inductor to current flow

depends only on the resistance of the coil

depends on the magnitude of the applied voltage

varies directly with frequency

varies inversely with frequency

⇒ The log magnitude curve for a constant gain K is a horizontal straight line at a magnitude 20 log K dB.

TRUE

FALSE

⇒ In the given figure the reflected voltage wave after first reflectio

18 V

-18 V

30 V

-30 V

⇒ Image frequency rejection mainly depends upon

detector

mixer

IF

RF

⇒ Consider the z-transform X(

*z*) = 5

*z*

^{2}+ 4

*z*

^{-1}+ 3; 0 < |

*z*| < ∞ The inverse transform

*x*[

*n*] is

5δ[

*n*+ 2] + 3δ[

*n*] + 4δ[

*n*- 1]

5δ[

*n*- 2] + 3δ[

*n*] + 4δ[

*n*+ 1]

5

*u*[

*n*+ 2] + 3

*u*[

*n*] + 4

*u*[

*n*- 1]

5

*u*[

*n*- 2] + 3

*u*[

*n*] + 4

*u*[

*n*+ 1]

⇒ In a CE amplifier the ac cut off voltage is 9 V and slope of ac load line is - 0.5 mA/V. The ac saturation current is

9 mA

4.5 mA

3 mA

18 mA

⇒ -8 is equal to signed binary number

10001000

1000

10000000

11000000

⇒ The relative permeability of a ferromagnetic material is

1

less than 1

about 10

1000 or more

⇒ A 16 bit binary adder has

16 half adders

16 full adders

one half adders and 15 full adders

8 half adders and eight full adders

⇒

Match the following:

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

A. | Reflex Klystron | 1. | High efficiency |

B. | Dielectric loaded wave guide | 2. | Slow wave structure |

C. | TWT | 3. | Cross field device |

D. | Multi Cavity Klystron | 4. | Oscillator |

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

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

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

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

⇒ The logical expression Y = A + AB is equivalent to

Y = AB

Y = AB

Y = A + B

Y = A + B

⇒ Thermistor has a positive temperature coefficient.

TRUE

FALSE

⇒ Choose the correct option

- Transit period is the time between two steady state
- Transient Response is the response due to internal energy stored in circuit
- Transit response is also called natural response
- Transit response arises due to presence of C and L in the circuit
- Transit is due to R, L, C in the circuit

4, 3, 2 , 1

5, 4, 3, 2

5, 4, 3, 1

5, 1, 4

⇒ If two time varying signals of equal magnitude and zero phase displacement are applied to X and Y plates respectively; of CRO, the display will be

a straight line

a circle

an ellipse

a square

⇒ The logic realized by the circuit shown in figure belo

F = A - C

F = A + C

F = B ⊙ C

F = B ⊕ C

⇒ A p matching network for coupling the transmitter output of the antenna is shown in figu

minimum D.C. plate current

maximum D.C. plate current

maximum RF antenna current

specified value of the D.C. plate current

⇒ Which of these has semi-conductor metal junction?

PIN diode

Photo diode

Tunnel diode

Schottky diode

⇒ The quantum numbers associated with electron motion are designed as

*a, b, c*

*h, k, l*

*n, m, l*

*h, n, l*

⇒ K maps can be drawn

only for 2 variables

only for 3 variables

only for 4 variables

for any number of variables

⇒ A transistor has a maximum power dissipation of 350 mW at an ambient temperature of 25°C. If derating factor is 2 mW/°C, the maximum power dissipation for 40°C ambient temperature is

300 mW

330 mW

350 mW

380 mW

⇒ In a megger the controlling torque is provided by

spring

gravity

coil

eddy current

⇒ Acoustic strain gauges

have good linearity of measurement

do not have long term stability

have a large range of measurement

have an accuracy range of 0.1-1% depending on environment

⇒ If each branch of a Delta circuit has impedance 3 Z then each branch of the equivalent Y circuit has impedance.

Z/3

3 Z

3/3 Z

Z/3

⇒ MCVF telegraphy causes

SSB techniques

pulse modulation

Out of bond signalling

FM

⇒ The semiconductor diode which can be used in switching circuit in microwave range is

PIN diode

Varactor diode

Tunnel diode

Gunn diode

⇒ The system of the given fi

is unstable for all values of K

is stable for all values of K

can be stable for some values of K

data is insufficient to determine stability

⇒ When a power diode is conducting, the voltage drop across it is about

I V

5 V

20 V

50 V

⇒ Two coils are so wound that 60% of the flux of one links the other. The coefficient of coupling is

1.67

0.6

0.36

0.216

⇒ Two sinusoidal waves 1 and 2 have peak values V

_{m1}and V

_{m2}. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct?

*v*

_{1}= V

_{m1}sin θ and

*v*

_{2}= V

_{m2}cos θ

*v*

_{1}= V

_{m1}sin ω

*t*and

*v*

_{2}= V

_{m2}sin (ω

*t*- θ)

*v*

_{1}= V

_{m1}sin (ω

*t*+ θ/2) and

*v*

_{2}= V

_{m2}sin ω

*t*

none of the above

⇒ If 4 in binary system is 100 then 8 will be

10

100

111

1000