A heat pump is used to meet the heating requirements of a house and maintain it at 20°C. On a day when the outdoor air temperature drops to 2°C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the heat pump under these conditions has a COP of 2.5, determine the rate at which heat is absorbed from the cold outdoor air.

A heat pump is used to meet the heating requirements of a house and maintain it at 20°C. On a day when the outdoor air temperature drops to 2°C, the house is estimated to lose heat at a rate of 80,000 kJ/h. If the heat pump under these conditions has a COP of 2.5, determine the power consumed by the heat pump.

A

32000 kJ/h

B

33000 kJ/h

C

34000 kJ/h

D

35000 kJ/h

Which one of the following four addresses is NOT EXACTLY the same as the one given below? Zoar Outdoor E - Mail: [email protected] Mohawk Trail Charlemont, Massachusetts 01339 (800) 5327483 (i) Zoar Outdoor E - Mail: [email protected] Mohawk Trail Charlemont, Massachusetts 01339 (800) 5327483 (ii) Zoar Outdoor E - Mail: [email protected] Mohawk Trail Charlemont, Massachusetts 01339 (800) 5327483 (iii) Zoar Outdoor E - Mail: [email protected] Mohawk Trail Charilemont, Massachasetts 01339 (800) 5327483 (iv) Zoar Outdoor E - Mail: [email protected] Mohawk Trail Charlemont, Massachusetts 01339 (800) 5327483

A

i

B

ii

C

iii

D

iv

Ayesha put two drops of oil on the lid of her tiffin box. Next to that, she put two drops of water and two drops of sugar solution. She tilted the lid. She saw some drops slid down quickly, while some were left behind. Which drops slid down her tiffin box the fastest?

A

oil

B

water

C

sugar solution

D

All slid down at the same rate

In a certain language GJL TUO CBM stands for 'It is car' QAZ GJL KJH stands for 'He is Ram' CBM KJH OIU stands for 'Ram has car' In that language, which of the following stands for 'It'?

A

QAZ

B

TUO

C

CBM

D

КJН

Nirav's house is 40 m south of Akash's house. Daksh's house is to the east of Akash's house in a straight line at a distance of X m. Prakash's house if to the west of Akash's house in a straight line at a distance of Y m. If the shortest distance between Prakash's house and Nirav's house is 50 m and the shortest distance between Daksh's house and Nirav's house is also 50 m, then what is the distance between Prakash's house and Daksh's house?

A

40 m

B

30 m

C

60 m

D

80 m

The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

A

(td₂ - td₃)/(td₃ - td₁)

B

(td₃ - td₂)/(td₃ - td₁)

C

(td₃ - td₁)/(td₂ - td₃)

D

(td₃ - td₁)/(td₃ - td₂)

The bypass factor (B.P.F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil and td₃ = Dry bulb temperature of heating coil)

A

$$\frac{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}$$

B

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_2}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}$$

C

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}$$

D

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_2}}}$$

The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)_R and the co-efficient of performance as a heat pump (COP)_HP are

A

(COP)_R = (COP)_HP = 0.6

B

(COP)_R = 2.5; (COP)_HP = 1.5

C

(COP)_R = 1.5; (COP)_HP = 2.5

D

(COP)_R = (COP)_HP = 2.5

Following are general statements about water drops. (a) Surface tension is responsible for the spherical shape of the water drops. (b) Even in the absence of gravitation, water drops have a spherical shape. (c) Formation of water drops occurs, if the mass of the water is stretched. Which of the above statement/statements is/are correct?

A

(a) only

B

(a) and (b) only

C

(c) only

D

(a), (b) and (c)

Which of the following statements are true regarding cold and hot deserts: (a) Hot deserts have high temperature while cold deserts have low temperature. (b) hot deserts are battered by sun and are sandy. Cold deserts have ice and snow covered ground. (c) Hot deserts are red or orange while cold deserts are gray. (d) Hot and cold deserts experience a significant seasonal effect.

A

(a) and (b)

B

(a), (b) and (c)

C

(a) and (c)

D

(a), (b), (c) and (d)

Related Questions