61. A transistor works in ……… regions.
(A) 1
(B) 2
(C) 3
(D) 9
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62. The a and ß of a transistor are related to each other as-—-
(A) 
(B) 
(C) 
(D) None of these
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63. A 220 V d.c. shunt motor runs at 500 rpm when the armature current is 50 A. If the torque is doubled, the speed will be ……… (given that Ra = 0.2 Ω)
(A) 476 r.p.m.
(B) 500 r.p.m.
(C) 525 r.p.m.
(D) 576 r.p.m.
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64. The ‘V’ curve of synchronous motor shows the relationship between—
(A) Applied voltage and back e.m.f.
(B) Back e.m.f. and armature current
(C) Armature current and rotor field current
(D) Back e.m.f. and power factor
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65. A 6 pole induction motor is supplied by a 10 pole alternator which is driven at 600 r.p.m. If the motor is running at 970 r.p.m. determine the percentage slip ?
(A) 3%
(B) 4%
(C) 5%
(D) 6%.
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66. The value of Stefan Boltzmann constant is equal to
(A) 4.97 x 10-4
(B) 4.97 x 10-6
(C) 4.97 x 10-8
(D) 4.97 x 10-10
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67. According to Newton’s law of cooling, the rate of heat transfer from a solid surface area A, at a temperature t1, to a fluid at temperature t2, is given by
(A) Q = hA(t1 + t2)
(B) Q = hA(t1 – t2)
(C) Q=h/A (t1 + t2)
(D) Q=h/A (t1– t2)
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68. Flywheel absorbs energy when—
(A) The turning moment is less than the resisting moment
(B) The turning moment is equal to resisting moment
(C) The turning moment is greater than the resisting moment
(D) None of these
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69. The figure shows the circuit symbol of—
(A) FET
(B) MOSFET
(C) MOSFET
(D) MOSFET
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70. In the circuit shown in the figure, if RL=Rc=1 kΩ, then the value of V0, will be—
(A) 4.55 V
(B) 2.4 V
(C) 1 V
(D) Zero
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71. Given (135)base x + (144)base x = (323)base x. What the value of base x ?
(A) 5
(B) 3
(C) 12
(D) 6
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72. (1111)2 in grey code represents—
(A) 9
(B) 15
(C) 10
(D) 16
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73. The difference between the measured value and the true value is called
(A) Gross error
(B) Relative error
(C) Probable error
(D) Absolute error
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74. Ring main distribution system is more reliable because of
(A) More protective devices used
(B) Two or more sources of supply
(C) Higher size of conductor used
(D) Higher load current
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75. A piece of silver wire has a resistance of 1 Ω. What will be the resistance of manganin
wire of one-third length and one-third the diameter, if the specific resistance of the manganin is 30 times that of silver
(A) 1/9 Ω
(B) 1/90 Ω
(C) 9 Ω
(D) 90 Ω
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76. What is the reactance of an 8 μF filter capacitor at a frequency of 120 Hz ?
(A) 6.28 Ω
(B) 120 Ω
(C) 165.9 Ω
(D) 16.59 Ω
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77. The maximum bending moment in case of simply supported beam of span ‘L’ carrying a uniform distributed load of W tons/em is equal to –
(A) WL2/4
(B) WL/4
(C) WL2/8
(D) WL2/2
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78. The maximum slope in case of a cantilever with a point load at the free end is equal to –
(A) Qmax = WL/2EI
(B) Qmax = WL3/EI
(C) Qmax = WL4/3EI
(D) Qmax = WL2/3EI
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79. The crest diameter of the screw thread is the
(A) Largest diameter
(B) Minor diameter
(C) Mean diameter
(D) None of these
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80. The ………. current of a junction FET (JFET) is practically zero.
(A) Anode
(B) Gate
(C) Cathode
(D) All of the above
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