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Q1. | The unit for luminous energy is |

A. | lumens/sec [Wrong Answer] |

B. | lumens/m^{2} [Wrong Answer] |

C. | lumen-sec [Correct Answer] |

D. | lumen/m [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 :**

⇒ A satellite link uses different frequencies for receiving and transmitting in order to

avoid interference from terrestrial microwave links

avoid interference between its powerful transmitted signal and weak in coming signal

minimise free-space losses

maximise antenna gain

⇒ For a transistor if a

_{dc}= 0.98 and emitter current

*I*

_{E}is 2

*mA*, then collector current will be

0.44 mA

0.88 mA

1.96 mA

3.32 mA

⇒ 2's complement number 00011111 = __________

_{10}

31

-31

11

-11

⇒ In FM signal with a modulation index

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

_{f}*m*

_{f}3

*m*

_{f}*m*/3

_{f}*m*/9

_{f}⇒ Modified Mc Murray full bridge inverter uses

4 thyristors and 2 diodes

4 thyristors and 4 diodes

8 thyristors and 4 diodes

8 thyristors and 8 diodes

⇒ The temperature of cathode is increased from 2500K to 2600K. The increase in thermionic emission current is about

0.001

0.04

0.5

1.5

⇒ Calculate the resistivity of

*n*-type semiconductor from the following data, Density of holes = 5 x 10

^{12}cm

^{-3}. Density of electrons = 8 x 10

^{13}cm

^{-3}, mobility of conduction electron = 2.3 x 10

^{4}cm

^{2}/ V-sec and mobility of holes = 100 cm

^{2}/V-sec.

0.43 Ω-m

0.34 Ω-m

0.42 Ω-m

0.24 Ω-m

⇒ The action of backward wave oscillator is similar to that of

klystron amplifier

reflex klystron oscillator

TWT

magnetron

⇒ In the given figure, the number of individual loop

2

4

5

6

⇒ Covalent bond energy in Germanium is approximately

3.8 eV

4.7 eV

7.4 eV

12.5 eV

⇒ A current of 3.18 A is flowing through resistance of 35.68 Ω. The voltage drop across resistance to the appropriate number of significant figures is

113.4624 V

113.462 V

113.46 V

113 V

⇒ Which of the following equations satisfy Maxwell's equations?

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

F

_{y}= cos (

*y*-

*ct*), E

_{x}= E

_{z}= 0

None of these

⇒ With the switch in STOP position, Y will be equa

0

1

CLK

none of these

⇒ If ω

_{0}is the angular frequency of rotation of electron in the absence of magnetic field, the angular frequency ω, when a magnetic field B is acting is ω ≅ ω

_{0}+ (

*e*/2

*m*)B.

TRUE

FALSE

⇒ The operator precedence in Java is in the order

arithmetic operation, increment and decrement operation, comprassion, logical operation and assignment operation.

increment and decrement operation, arithmetic operation, comparison, logical operation and assignment operation.

comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation.

arithmetic operation, comparison operation, increment and decrement operation, logical operation and assignment operation.

⇒ The equation ∇ . J = 0 is called

Poisson's equation

Kirchoff's node equation

Continuity equation for static currents

Continuity equation for sampling currents

⇒ If we need a low noise device, we should use

BJT

FET

thyristor

UJT

⇒ The colour on the extreme left in general purpose fixed resistors represents

first significant digit

tolerance

wattage rating

voltage rating

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave

⇒ If Nyquist plot has a encirclement of (-1 +

*jo*) point, the system is stable if

there are no poles of G(

*s*) H(

*s*) in right-half plane

there is one pole of G(

*s*) H(

*s*) in right-half plane

there is no zeros of G(

*s*) H(

*s*) in right-half plane

none of the above

⇒ Which of the following instructions in 8085 does not belong to data transfer group?

`LDA addr`

`STA addr`

`XCHG`

`SUB r`

⇒ The carrier mobility in a semiconductor is 0.4 m

^{2}/Vs. Its diffusion constant at 300k will be (in m

^{2}/s).

0.43

0.16

0.04

0.01

⇒ 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

⇒ Δ

^{2}V = - r/E is known as __________ equation

Poisson

Fourier

Laplace

Maxwell

⇒ Which of the following number specification refers to FET with one gate?

2N

3N

3Y

3X

⇒ A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the radiated power

730 W

73 W

100 W

None

⇒ A multivibrator can be used as a

cavity resonator

harmonic generator

wave form modifier

any of the above

⇒ If a sample of germanium and a sample of Si have the impurity density and are kept at room temperature then

both will have equal value of resistivity

both will have equal -ve resistivity

resistivity of germanium will be higher than that of silicon

resistivity of Si will be higher than of germanium

⇒ A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to

0.9999 V

1.9999 V

0.199 V

9.999 V

⇒ The material used for fuse must have

low melting point and low specific resistance

low melting point and high specific resistance

high melting point and low specific resistance

none