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Q1. | In auxiliary commutated chopper, the charging and discharging time of capacitor |

A. | are constant [Wrong Answer] |

B. | depend on load current [Correct Answer] |

C. | may be constant or may depend on load current [Wrong Answer] |

D. | none of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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):** An amorphous material is obtained when mobility of atoms is inhibited during solidification.

**Reason (R):** Crystalline state is a natural state for most solids.

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 but R is false

A is false but R is true

⇒ To protect an SCR against high

*di*/

*dt*we connect

a capacitance in series with SCR

a capacitance in parallel with SCR

an inductance in parallel with SCR

an inductance in series with SCR

⇒ A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is

500 Ω

50 Ω

20 Ω

5 Ω

⇒ In a linear circuit, the superposition principle can be applied to calculate the

voltage and power

voltage and current

current and power

voltage, current and power

⇒ FM broadcast is used in

VHP range

UHF range

MF range

both VHP and UHF range

⇒ Consider the following program in B

2.827

28.27

282.7

2827

⇒ The term 'Poisson's ratio' is connected with

strain gauge

LVDT

Bourden tube

capacitance transducer

⇒ In VCR the luminance signal is recorded by

frequency modulation

phase modulation

amplitude modulation

direct recording

⇒ In low power factor wattmeter, the compensating coil is connected

in series with current coil

in parallel with current coil

in series with pressure coil

in parallel with pressure coil

⇒ Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is

0.25 mH

0.5 mH

0.707 mH

1 mH

⇒ It is desired to design a phase shift oscillator using an FET having a

*g*= 5000 μSiemen,

_{m}*r*= 40

_{d}*k*Ω and feedback circuit value of R = 10 K. Then value of C for oscillator operation at 1

*k*H

*z*and that of

*R*for A = 40 to ensure oscillator action are

_{D}6.4

*n*F, 80 K

6.5

*n*F, 10 K

6.5

*p*F, 10 K

65

*p*F, 80 K

⇒ Which of the following statements is not correct for thermistors?

They have negative temperature coefficient of resistance

The sensing element is made of sintered ceramics, which are oxides of metals in the form of beads

The variation of resistance with temperature is linear

The resistance value at ambient temperature may range from 100 Ω to 100 kΩ

⇒ The disadvantage of FET over BJT is

poor high frequency performance

low power-handling ability

low values of voltage gain

all of the above

⇒ It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and ε

_{r}= 7). The thickness of the polystyrene plate required at 10 GHz will be

5.039 cm

50.39 cm

0.5039 cm

0.05039 cm

⇒

**Assertion (A):** In computers the data is stored in hexadecimal form

**Reason (R):** Hexadecimal representation is short as compared to binary representation.

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 true, R is false

A is false, R is true

⇒ For the infix expression (A/B) * (C * F + (A - D) * E) the corresponding Post fix notation is

A / D * CF AD - F * +

AB / CF * AD - E * + *

AB / C * FAD - E * + *

None of the above

⇒ The no. of comparators required in a 3 bit comparator type ADC is

2

3

7

8

⇒ The mean free path of conduction electrons in copper is about 4 x 10

^{-8}m. For a copper block, find the electric field which can give, on an average, 1 eV energy to a conduction electron

2.62 x 10

^{7}V/m

2.64 x 10

^{7}V/m

2.5 x 10

^{7}V/m

2.58 x 10

^{7}V/m

⇒ A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

1200 revolutions

1800 revolutions

2100 revolutions

2400 revolutions

⇒ The scale of moving iron instrument is linear.

TRUE

FALSE

⇒ Which of the following is invalid integer variable name in Fortran?

IAEG

I 124

AILG

MI AC

⇒ The unit of thermal resistance of a semi-conductor device is

Ohms

Ohms/°C

°C/ohm

°C/watt

⇒ FORTRAN expression for 3

*b*

^{2}-5

*a*

^{2}is

SQRT (3 * B ** 2 - 5 * A ** 2)

SQRT 3 * B ** 2 - 5 * A ** 2

SQRT (3 * b ** 2 - 5 * a ** 2)

SQRT (3 * B ** 2) - SQRT (5 * A **2)

⇒ A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be

47°

less than 47°

more than 47°

either more or less than 47°

⇒ Two wattmeter method of 3-phase power measurement can be used to find

total active power

total active power and power factor

total active power and reactive power

total active power, power factor, apparent power, and reactive power

⇒ The first geostationary satellite launched in 1965 was called

ANIK

EARLY BIRD (Intelsat-I)

WESTAR

MOLNIYA

⇒ An electric heater is controlled by thyristors through on-off control. If a = 0.4, the heating is

16% maximum

40% of maximum

60% of maximum

84% of maximum

⇒ The coupling capacitor in amplifier circuits

affects dc biasing

does not affect dc biasing

affects dc biasing to some extent

both (a) and (c)

⇒ When analysing two port networks in parallel it is more convenient to use

*z*parameters

*h*parameters

T parameters

*y*parameters

⇒ If a = 0.995, I

_{E}= 10 mA, I

_{CO}= 0.5 mA, then I

_{CEO}will be

100 μA

25 μA

10.1 μA

10.5 μA