Description : What is the optimum reverberation time at 500 Hz for a cinema? A. 0.8 – 1.2 sec. B. 0.9 – 1.3 sec. C. 0.6 – 0.8 sec. D. 0.45 – 0.55 sec.
Last Answer : A. 0.8 – 1.2 sec.
Description : What is the optimum volume per person of rooms for speech? A. 2.8 B. 3.1 C. 4.2 D. 5.1
Last Answer : A. 2.8
Description : A radio communications link is to be established via the ionosphere. The maximum virtual height of the layer is 100 km at the midpoint of the path and the critical frequency is 2 MHz. The distance between stations is 600 ... optimum working frequency? A. 6.32 MHz B. 2.1 MHz C. 5.4 MHz D. 1.8 MHz
Last Answer : C. 5.4 MHz
Description : What is the optimum reverberation time at 500 to 1000 Hz of an auditorium? A. 0.9 to 1.1 s B. 1.4 to 1.6 s C. 1.5 to 1.6 s D. 1.6 to 1.8 s
Last Answer : D. 1.6 to 1.8 s
Description : What does OMB stand for? A. Optical media board B. Organization of medical biologist C. Optical medium board D. Optimum main board
Last Answer : A. Optical media board
Description : To obtain the most reliable sky wave propagation the ____ should be used. A. Lowest useable frequency (LUF). B. Maximum useable frequency (MUF). C. Optimum useable frequency (OUF). D. Critical frequency
Last Answer : C. Optimum useable frequency (OUF).
Description : What volume of the chamber is required to measure absorption coefficient at 100 Hz? A. 125 m3 B. 50 m3 C. 150 m3 D. 352 m3
Last Answer : D. 352 m3
Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is - (1) 4 - 6 (2) 2 - 4 (3) 8 - 10 (4) 12 - 16
Last Answer : (1) 4 - 6 Explanation: Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is ... approach saturation - that concentration which is in equilibrium with the partial pressure of atmospheric oxygen.
Description : The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organisms is : (1) 4 – 6 (2) 2 – 4 (3) 8 – 10 (4) 12 – 16
Last Answer : 4 – 6
Description : pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant. (A) 4-5 (B) 7-8 (C) 9-10 (D) 12-13
Last Answer : (B) 7-8
Description : Which is the optimum PH for nitrification? (Agriculture MCQ) a. 8.5 b. 9.5 c. 10 d. 7.5
Last Answer : a. 8.5
Description : Find the equivalent inductance per foot of the above cable? A. 13.5 nF/ft B. 13.5 pF/ft C. 116.8 nH/ft D. 116.8 pF/ft
Last Answer : C. 116.8 nH/ft
Description : ECE Board Exam March 1996 What is the transmission rate of a system for transmitting the output of a microcomputer to a line printer operating at a speed of 30 lines/minute? Assume that the line printer has 8 bits ... and prints out 80 characters/line. A. 800 bps B. 400 bps C. 320 bps D. 640 bps
Last Answer : C. 320 bps
Description : Optimum area under forest required
Last Answer : Ans. 33%of total geographical area
Description : What is the optimum spacing required for planting onion seedlings during Rabi season? a. 25*25 cm B. 20*20 cm C. 5*5 cm D. 10*10 cm
Last Answer : D. 10*10 cm
Description : Optimum number of effects in a multiple effect evaporator is decided by the (A) Cost benefit analysis (B) Floor area availability (C) Terminal parameters (D) Evaporation capacity required
Last Answer : (A) Cost benefit analysis
Description : A popular light wavelength in fiber-optic cable is a. 0.7 um b. 1.3 um c. 1.5 um d. 1.8 um
Last Answer : b. 1.3 um
Description : A measurement of -75 dBm, C-message weighted, would be _________ dBrnc. A. 8 B. 7 C. 9 D. 15
Last Answer : D. 15
Description : Which of the following principal musical intervals is considered dissonant? A. 7:8 B. 1:2 C. 5:8 D. 3:5
Last Answer : A. 7:8
Description : Calculate the reverberation time of a living room 8 ft high, 13 ft wide and 20 ft long. The total absorption of the building structure inside the room is 180.7 sabines with four persons present in the room. A. 0.5 ms B. 0.05 s C. 0.5 s D. 5 ms
Last Answer : C. 0.5 s
Description : An FM receiver whose intermediate frequency is 10.7 MHz, is experiencing image channel interference from a station transmitting on 121.1 MHz. If the local oscillator is tracking above, the receiver is tuned to A. 131.8 MHz B. 110.4 MHz C. 142.5 MHz D. 99.7 MHz
Last Answer : D. 99.7 MHz
Description : A radio signal moves from air to glass. The angle of incidence is 20°. Calculate the angle of refraction. The relative permittivity of the glass is 7.8. A. 7.8° B. 5.04° C. 6.04° D. 7.04°
Last Answer : D. 7.04°
Description : What is the typical velocity factor of open-wire line? A. 0.9 B. 0.8 C. 0.5 D. 0.7
Last Answer : A. 0.9
Description : The Ku-band in the satellite service A. 14/11 GHz B. 30/17 GHz C. 8/7 GHz D. 6/4 GHz
Last Answer : A. 14/11 GHz
Description : What is affected by the distance between the listener and the source of the sound because the intensity varies inversely with the square of the distance? A. Volume B. Pitch C. Loudness D. Frequency
Last Answer : C. Loudness
Description : In acoustics, if the volume of the room is 200 m3 then at what frequency the coefficient of absorption is measured? A. 120 kHz B. 120 Hz C. 100 Hz D. 150 Hz
Last Answer : B. 120 Hz
Description : One of the advantages of fiber optic which is referred to the volume of capacity of signals it can carry. A. Security B. Weight C. Bandwidth D. Physical size
Last Answer : C. Bandwidth
Description : A method of expressing the amplitude of complex non-periodic signals such as speech. A. Frequency B. Wavelength C. Volume D. Pitch
Last Answer : C. Volume
Description : ______ used to measure speech volume A. Volume meter B. Audio frequency meter C. Volume unit meter D. Speech meter
Last Answer : C. Volume unit meter
Description : Synchronous modems cost more than asynchronous modem because _______. A. They have larger bandwidth B. They are larger C. The production volume is larger D. They have clock recovery circuits
Last Answer : D. They have clock recovery circuits
Description : A loudspeaker cabinet has an internal volume of 5,184 in3 (84,950 cm3 ). It has a port area on the baffle of 50 in2 (322.58cm2 ) and a thickness of 0.70 in (18 mm). What is the Helmholtz resonance, in hertz, of this loudspeaker enclosure? A. 250 Hz B. 245 Hz C. 240 Hz D. 255 Hz
Last Answer : C. 240 Hz
Description : A speaker cabinet has an internal volume 84,950 cm3 . It has a port area on the baffle of 3,230 cm2 and baffle thickness of 19 mm. What is the Helmholtz resonance hertz of this speaker enclosure? A. 260 Hz B. 245 Hz C. 265 Hz D. 250 Hz
Last Answer : B. 245 Hz
Description : The optimum plant population per hectare of bajra is (a) 50,000 plants (b) 1,00,000 plants (c) 1,50,000 plants (d) 2,00,000 plants
Last Answer : (b) 1,00,000 plants
Description : What is the required quality factor for an SSB filter with the following data: center frequency= 1 MHz, the desired attenuation level of the unwanted sideband= 80 dB and the separation between sidebands= 200 Hz? A. 1,250 B. 12,500 C. 125,000 D. 25,000
Last Answer : C. 125,000
Description : What signal-to-noise ratio is required for satisfactory television reception? A. 10 dB B. 30 dB C. 40 dB D. 20 dB
Last Answer : C. 40 dB
Description : What is the minimum number of bits required in a PCM code for a range of 10,000? A. 12 B. 9 C. 14 D. 10
Last Answer : C. 14
Description : What is the number of levels required in a PCM system with S/N ratio of 40 dB? A. 64 B. 128 C. 256 D. 512
Last Answer : B. 128
Description : In cellular system, _____ defines the geographic distance that is required between cells using identical frequencies in order to avoid interference between the radio transmissions at these cells. A. frequency-reuse ratio B. distance-to-reuse ratio (D/R) C. reuse format plan ratio D. reuse factor
Last Answer : B. distance-to-reuse ratio (D/R)
Description : A receiver is located 64 km from a space wave transmitting antenna that is 100 meters high. Find the required height of the receiving antenna. A. 36 meters high B. 64 meters high C. 100 meters high D. 182.25 meters high
Last Answer : A. 36 meters high
Description : Width of frequency band just enough to ensure the transmission of information at a required rate and quality required, and under a specified condition and class of emission. A. Occupied bandwidth B. Transmission bandwidth C. Necessary bandwidth D. Frequency bandwidth
Last Answer : C. Necessary bandwidth
Description : One of the following is not among the major components required on board ship under the global maritime distress and safety system. A. On board radio facilities B. Radio operator telegraphy onboard C. Shore base facilities D. Radio personnel on board
Last Answer : B. Radio operator telegraphy onboard
Description : The signal to noise ratio that is required for a satisfactory television reception. A. 30 dB B. 40 dB C. 10 dB D. 20 dB
Last Answer : B. 40 dB
Description : How much is the required minimum power output of an international AM BC stations? A. 5 kW B. 30 kW C. 10 kW D. 50 kW
Last Answer : D. 50 kW
Description : What is the period of a wave? A. The number of degrees in tone cycle B. The number of zero crossing in one cycle C. The amplitude of the wave D. The time required to complete one cycle
Last Answer : D. The time required to complete one cycle
Description : An AM transmitter is rated 100W at 100% modulation. How much power required for the carrier? A. 33.33 W B. 66.66 W C. 83.33 W D. 100 W
Last Answer : B. 66.66 W
Description : The width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under a specified condition and class of emission. A. Occupied bandwidth B. Reference frequency C. Necessary bandwidth D. Frequency tolerance bandwidth
Description : What signal-to-noise ratio is required for satisfactory telephone services? A. 50 dB B. 30 dB C. 40dB D. 20 dB
Last Answer : A. 50 dB
Description : A microwave system that requires the use of repeater. A. Intervening terrain is favorable B. Distances involved are greater C. The required reliability is met D. All of these
Last Answer : B. Distances involved are greater