61. The formation of frost on cooling coils in a refrigerator
(a) Increases heat transfer
(b) Improves COP of the system
(c) Reduces power consumption
(d) Increases power consumption
Answer: (d)
62. The effect of Sub cooling in a refrigeration cycle will result in
(a) More COP
(b) Less COP
(c) No change in COP
(d) More power consumption
Answer: (a)
63. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
(a) Which lies between dry bulb and wet bulb temperature of incoming stream
(b) Which lies between wet bulb and dew point temperature of incoming stream
(c) Which is equal to wet bulb temperature of air
(d) Which is lower than dew point temperature of air
Answer: (d)
64. In a chemical dehumidification process, the dry bulb temperature of air
(a) Decreases
(b) Remains constant
(c) Increases
(d) Depends on wet bulb temperature
Answer: (c)
65. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at
40°C. The air leaves the heating coil at 25°C. The by-pass factor of the heating coil is
(a) 0.376 (b) 0.6
(c) 0.4 (d) 0.5
Answer: (b)
66. A grinding wheel of 150 mm diameter is rotating at 3000 rpm. The grinding speed is :
(a) 15 $\pi$ m/s (b) 7.5 $\pi$ m/s
(c) 45 $\pi$ m/s (d) 450 $\pi$ m/s
Answer: (b)
67. The angle made by the face of the tool and the plane parallel to the base of cutting tool is called
(a) Rake angle (b) Cutting angle
(c) Lip angle (d) Clearance angle
Answer: (a)
68. When the metal is removed by erosion caused by rapidly recurring spark discharges
between the tool and work, the process is known as
(a) Electro chemical machining
(b) Ultra-sonic machining
(c) Electro-discharge machining
(d) Electro-static machining
Answer: (c)
69. In order to double the period of a simple pendulum, the length of the string should be :
(a) Halved (b) Doubled
(c) Tripled (d) Quadrupled
Answer: (d)
70. In a multiple V-belt drive system, when a single belt is damaged, it is preferable to change
the complete set in order to
(a) reduce vibration
(b) reduce slip
(c) ensure proper alignment
(d) ensure uniform loading
Answer: (d)
71. Mohan is five times older than his son. After 4 years the sum of their ages will be 44 years.
Find the present age of Mohan?
(a) 42 years (b) 30 years
(c) 25 years (d) 40 years
Answer: (b)
72. For a sphere of radius 10 cm, the numerical value of surface area is what percent of
numerical value of its volume?
(a) 40 (b) 25
(c) 12.5 (d) 30
Answer: (d)
73. A man bought a house and a cart. If he sells the house at 10% loss and cart at 20% gain, he will not lose anything. But, if he sells the house at 5% loss and cart at 5% gain he would lose Rs.100. The amount paid by him for the house and cart will be?
(a) Rs.2000 and Rs.4000
(b) Rs. 400 and Rs. 200
(c) Rs. 200 and Rs.400
(d) Rs. 4000 and Rs. 2000
Answer: (d)
74. Average marks of 15 students in a class is 145, maximum marks being 150. If two lowest scores are removed, the average increases by 5. Also two lowest scores are consecutive multiples of 9. What is the lowest score in the class?
(a) 126 (b) 108
(c) 117 (d) None of the above
Answer: (b)
75. In a mixture of wheat and barley, wheat is 60% of 400 kg of mixture. Further, some quantity
of barley is added and percentage of wheat becomes 531/3%. How many kg of barley is added?
(a) 25 (b) 50
(c) 80 (d) 40
Answer: (b)
76. I see an object 3 kms to east and 4 kms to north. It appears to be moving at 1 km per minute
in south west direction. At what speed (km per minute) is it getting closer to me?
(a)$\frac{1}{5\sqrt{2}}$ (b)$\frac{1}{5}$
(c) $\frac{7}{5\sqrt{2}}$ (d)$\frac{7}{5}$
Answer: (c)
77. Eigen values of a 4 × 4 matrix [A] are given as 2, –3, 13 and 7. Then, what is the value of
|det[A]|?
(a) 25 (b) 19
(c) –546 (d) 546
Answer: (d)
78. The mean value of a function f(x) from point ‘a’ to point ‘b’ is given by
(a) $\frac{f (a) + f (b)}{2}$
(b )$\frac{f (a) 2f(\frac{a+b}{2})+ f (b)}{4}$
(c) $\int\limits_a^b f(x) \ dx$
(d)$\frac{\int\limits_a^b f(x) \ dx}{(b-a)}$
Answer: (d)
79. The area of a circle of radius ‘a’ can be found by following integral
(a) $\int\limits_a^b (a^2 + x^2) \ dx $
(b) $\int\limits_0^{2\pi} \sqrt{(a^2 - x^2)} \ dx $
(c) 4x$\int\limits_0^a \sqrt{(a^2 - x^2)} \ dx $
(d) $\int\limits_0^a \sqrt{(a^2 - x^2)} \ dx $
Answer: (c)
80. In a box there are 5 red balls, 3 blue balls and 2 green balls. If a ball is selected at random, what is the probability that it is blue or green?
(a) 2/5 (b) 1/3
(c) 9/10 (d) 1/2
Answer: (d)
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