Out of 100 kcal/second of incident radiant energy on the surface of a
thermally transparent body, 300 kcal/second is reflected back. If the
transmissivity of the body is 0.25, the emissivity of the surface will be
(A) 0.35
(B) 0.45
(C) 0.55
(D) 0.85
Description : For an ideal black body (A) Absorptivity = 1 (B) Reflectivity = 1 (C) Emissivity = 0 (D) Transmissivity = 1
Last Answer : (A) Absorptivity = 1
Description : For a perfectly transparent surface (like gases), the (A) Absorptivity = 0 (B) Transmissivity = 1 (C) Reflectivity = 0
Last Answer : (B) Transmissivity = 1
Description : Define the following terms : (i) absorptivity (ii) reflectivity (iii) transmissivity (iv) emissivity
Last Answer : Absorptivity: It is the fraction of total incident radiation which is absorbed by a body. Reflectivity: It is the fraction of total incident radiation which is reflected by a body. Transmissivity: It ... total emissive power of a body to emissive power of a black body at the same temperature.
Description : What is the percentage of radiant energy reflected back by surface called?
Last Answer : Albedo
Description : 1. Which vitamin is necessary for blood clotting? 2. Which can be abolished but not dissolved? 3. What does Talc contains? 4. What is the percentage of radiant energy reflected back by ... which countries? 20. The extent of the Delhi Sultanate empire was the greatest during which reign?
Last Answer : Answer : 1. Vitamin K 2. State Legislative Council 3. Magnesium, silicon and oxygen 4. Albedo 5. Nalanda 6. Vijay Kelkar 7. 1 percent 8. Lemurs 9. Mild rainfall 10. Mahayana sect 11. From ... 16. National income 17. Liver 18. Both Houses of Parliament 19. Sumatra and Malaysia 20. Alauddin Khilji
Description : Assume postal rates for 'light letters' are: $0.25 up to 10 grams; $0.35 up to 50 grams; $0.45 up to 75 grams; $0.55 up to 100 grams. Which test inputs (in grams) would be selected using boundary value analysis? A. 0, 9,19, ... C. 0, 1,10,11, 50, 51, 75, 76,100,101 D. 25, 26, 35, 36, 45, 46, 55, 56
Last Answer : C. 0, 1,10,11, 50, 51, 75, 76,100,101
Description : Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. a) 1.41 b) 3.5 c) 2.2 d) 1.73
Last Answer : d) 1.73
Description : Pick out the wrong statement: (A) With change in temperature, the radiant energy emitted by a black body remains unchanged (B) Absorptivity of a body approaches unity in case of diffuse reflection (C) Absorptivity of ... unity (D) Value of Stefan-Boltzmann constant is 4.876 10 -8 KCal/m2 .hr.°K4
Last Answer : (A) With change in temperature, the radiant energy emitted by a black body remains unchanged
Description : Find the ratio of the refractive index of medium 1 to that of medium 2, when the incident and reflected angles are given by 300 and 450 respectively. a) 0.5 b) 1 c) 2 d) 4
Last Answer : c) 2
Description : A officer undertakes to complete a job in 250 days. He employs 300 male for 50 days and they complete 1/2 of the work . He then reduces the number of male to 100, who work for 120 days, after which there ... male must be employed for the remaining period to finish the work? a) 25 b) 50 c) 45 d) 35
Last Answer : B 300 male in 50 days do = 1/2work 1 male in 1 day does = ½*1/50*1/300 work 100 male in 120 days do = ½ *1/50*1/300 *100*120 =2/5 work Total work done = ½ + 2/5 =(5+4)/10=9/10 ... is done in 50 days by 300 male 1/10 work is done in 60 days by =300*50*1*2/10*60 =50 male
Description : What is the maximum percent of energy recovered if the steam is condensed before reintroduced to system? a) 25 b) 35 c) 45 d) 55
Last Answer : 35
Description : In finish machining of an island on a casting with CNC milling machine, an end mill with 10 mm diameter is employed. The corner points of the island are represented by (0, 0), (0, 30), (50, 30) and (50, 0). By applying cutter radius right ... , 5), (5, 5) d.(5, 5), (45, 5), (45, 25), (5, 25), (5, 5)
Last Answer : a.(-5, 0), (-5, 35), (55, 35), (55,-5), (-5,-5)
Description : Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent. (A) 15 to 25 (B) 35 to 45 (C) 55 to 75 (D) 75
Last Answer : (B) 35 to 45
Description : An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted ... A) Fresnel reflection (B) Fresnel refraction (C) Snell's law (D) None of these
Last Answer : Answer: Option A
Description : The ratio of the total solar radiant energy returned by a planetary body to the total radiant energy incident on the body, the called: (A) Reflectance (B) Reflectance factor (C) Albedo (D) None of these
Last Answer : Answer: Option C
Description : What is the name given to the term that defines the proportion of the incident solar radiation which is diffusely reflected from the atmosphere and surface of the planet back into outer space?
Last Answer : ANSWER: ALBEDO
Description : The contribution of Agricultural sector to the gross domestic product (GDP) in India in the year 2004-05 has been nearly (A) 25 % (B) 45 % (C) 35 % (D) 55 %
Last Answer : (A) 25 %
Description : Disc angle in a standard disc plough varies from a. 25-35 ° c. 45-55 ° d. 55-65 °
Last Answer : Ans - b. 42-45 °
Description : At what angle must zig zag bracing be installed? a. 35-55 degree b. 35-60 degree c. 25-45 degree d. 35-70 degree
Last Answer : a. 35-55 degree
Description : An industry employed 1200 men and 800 women and the average salary was Rs 51 per day. If a woman got Rs 10 less than a man , then what are their daily salary?(mens and women respectively) A) men Rs 25 and women Rs ... Rs 45 and women Rs 55 C) men Rs 35 and women Rs 25 D) men Rs 55 and women Rs 45
Last Answer : D) Let the daily salary of man be Rs’x’ Then the daily salary of a women = Rs (x-100 Now 1200x + 800(x-10) = 51 *(1200+800) 1200x+800x -8000 = 51*2000 2000x = 102000+8000 =110000 X=55 Therefore mens daily salary Rs 55 and womens daily salary Rs 45
Description : The escape velocity from the earth’s surface is about 1. 30 km/sec 2. 6 km/sec 3. 11.2 km/sec 4. 300 km/sec 15. The radiant energy of the sun is due to (a) Nuclear fission (b) Nuclear fusion (c) Sinking of the sun (d) Violent explosions
Last Answer : Ans:(c)
Description : Carbon content in plain carbon steel is __________ percent. (A) 0.1 to 0.15 (B) 0.35 to 0.45 (C) 0.65 to 0.80 (D) 0.85 to 1.2
Last Answer : (B) 0.35 to 0.45
Description : Torch is kept at height from top surface of rail head? (i) 30 to 55 mm (ii) 35 to 40 mm (iii) 40 to 45 mm
Last Answer : (iii) 40 to 45 mm
Description : Cost of fencing a circular plot at the rate of Rs.15 per metre is Rs.3, 300. What will be the cost of flooring the plot at the rate of Rs.100 per square metre? a) Rs.3, 85,000 b) Rs.4, 70,000 c) Rs.2, 25,000 d) Rs.3, 50,000 e) Rs.2, 95,000
Last Answer : Perimeter of plot = 3300/15 = 220 meter 2πr = 220 2 × 22/7 × r = 220 r = 35 m. Area of plot = πr^2 = 22/7 × 35 × 35 = 3850 mt^2 Cost of flooring = 3850 × 100=Rs. 385000 Answer: a)
Description : BMR of healthy adult men is about (A) 30 kcal/hour/square metre (B) 35 kcal/hour/square metre (C) 40 kcal/hour/square metre (D) 45 kcal/hour/square metre
Last Answer : Answer : C
Description : Energy reserves of an average well-fed adult man are about (A) 50,000 kcal (B) 100,000 kcal (C) 200,000 kcal (D) 300,000 kcal
Last Answer : Answer : B
Description : At a respiratory quotient of 0.85, every litre of oxygen consumed represents an energy expenditure of (A) 5.825 kcal (B) 4.825 kcal (C) 3.825 kcal (D) 2.825 kcal
Description : The summarized balance sheet of Rakesh udyog Limited shows the balances of previous and current year of provision for taxation Rs. 50,000 and Rs. 65,000. If taxed paid during the current year amounted to Rs. 70,000 then amount charge ... a) Rs. 55,000 (b) Rs. 85,000 (c) Rs. 45,000 (d) Rs. 1,85,000
Last Answer : (b) Rs. 85,000
Description : A wave incident on a surface at an angle 60 degree is having field intensity of 6 units. The reflected wave is at an angle of 30 degree. Find the field intensity after reflection. a) 9.4 b) 8.4 c) 10.4 d) 7.4
Last Answer : c) 10.4
Description : An incident ray can be defined as ∙ A. a light ray reflected from a flat surface ∙ B. a light directed toward a surface ∙ C. a diffused light ray ∙ D. a light ray that happens periodically
Last Answer : ∙ B. a light directed toward a surface
Description : When a light ray travelling in glass is incident on an air surface, A. it will refract away from the normal B. some of the light may be reflected C. all of the light may be reflected D. two of A, B, and C E. all of A, B, and C
Last Answer : E. all of A, B, and C
Description : Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?
Last Answer : ANSWER: 30 DEGREES
Description : The calorific value of natural gas is about __________ kcal/Nm3 . (A) 10,000 (B) 2,500 (C) 25,000 (D) 35,000
Last Answer : (A) 10,000
Description : Equipment installation cost in a chemical process plant ranges from __________ percent of the purchased equipment cost. (A) 10 to 20 (B) 35 to 45 (C) 55 to 65 (D) 70 to 80
Description : An incident ray comes in parallel to the principle axis of a concave mirror. Is it reflected: w) back along the incident ray x) at 30 degrees to incident ray y) through the focal point z) through the center of curvature
Last Answer : ANSWER: Y -- THROUGH THE FOCAL POINT
Description : For a single mode optical cable with 0.25 dB/km loss, determine the optical power 100 km from a 0.1-mW light source. ∙ A. -45 dBm ∙ B. -15 dBm ∙ C. -35 dBm
Last Answer : ∙ C. -35 dBm
Description : What is the emissivity of a black body? A. 0 B. 1 C. 0.5 D. 0.25
Last Answer : 1
Description : A beam of light is incident on a perfectly smooth body of water. The angle that the REFLECTED ray makes with the normal is: w) greater than x) smaller than y) the same as the angle the incident ray makes with the normal.
Last Answer : ANSWER: Y -- THE SAME AS
Description : A light ray traveling from glass into air strikes the glass-air surface at an angle 50 degrees to the normal. If the critical angle for the glass-air combination is 42 degrees, the percentage of light reflected from the surface is w) 6 x) 25 y) 38 z) 100
Last Answer : ANSWER: Z -- 100
Description : Determine the standing wave ratio of a 300-Ω line whose load is 400+j150 Ω. A. 3.55 B. 1.67 C. 5.53 D. 3.35
Last Answer : B. 1.67
Description : What happens to reflected energy that enters a directional coupler that is designed to sample incident energy?
Last Answer : . The reflected energy adds at the absorbent material and is absorbed.
Description : If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, ... , the fineness modulus of the aggregate, is (A) 7.30 (B) 7.35 (C) 7.40 (D) 7.45
Description : Photons are incident from vacuum on a transparent material with a refractive index n for a given wavelength. Determine the momentum of the incident ph
Last Answer : Photons are incident from vacuum on a transparent material with a refractive index n for a given wavelength. ... (nlambda)` D. `h//lambda(n+1)`
Description : What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post ( a.0.35 b.0.8 c.1.46 d.2.85 e.107 dynes
Last Answer : a. 0.35
Description : When the circuit shown in the illustration is operating correctly, the voltage at the reference electrode will be kept in the optimum range of ____________. EL-0090 A. 0.01 - 0.05 volt B. 0.80 - 0.85 volt C. 35 - 60 volts D. 100 - 115 volts
Last Answer : Answer: B
Description : The minimum width of a stair in residential buildings, is (A) 55 cm (B) 70 cm (C) 85 cm (D) 100 cm
Description : Define: i. Transmissivity ii. Black body iii. Grey body iv. Reflectivity
Last Answer : Transmissivity: It is the the fraction of energy which is transmitted through the body. Or The ratio of amount of energy transmitted to the amount of energy incident on a body. Black body: A ... is defined as the ratio of amount of energy reflected to the amount of energy incident on a body.
Description : Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2
Last Answer : b) 0.4
Description : Calculate the ratio of sine of incident angle to the sine of reflected angle when the refractive indices of medium 1 and 2 are given as 2.33 and 1.66 respectively. a) 0.71 b) 1.4 c) 2 d) 3.99
Last Answer : a) 0.71
Description : Pegging stage in groundnut comes after (a) 30 D.A.S. (b) 45 D.A.S. (c) 55 D.A.S. (d) 35 D.A.S.
Last Answer : (c) 55 D.A.S.