Question 1: A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?
(a) 10/21
(b) 11/21
(c) 2/7
(d) 5/7
Answer: (a)
Question 2: The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is
(a) sin θ
(b) cos θ
(c) tan θ
(d) cosec θ
Answer: (a)
Question 3:Â The ability by which a measuring device can detect small differences in the quantity being measured by it, is called its
(a) Damping
(b) Sensitivity
(c) Accuracy
(d) None of the above
Answer: (b)
Question 4:Â Filters are used to convert
(a) Pulsating dc signal into a pure dc signal
(b) Pure dc signal into a pulsating dc signal
(c) Pulsating dc signal into a pure ac signal
(d) Pulsating ac signal into a pure dc signal
Answer (a)
Question 5: If the circumference of a circle is divided into 360 congruent (equal in length) parts, the angle subtended by one part at the centre of the circle is called the.
(a) Minute
(b) Degree
(c) Radian
(d) Angle
Answer: (b)
Question 6: A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
(a) 720
(b) 900
(c) 1200
(d) 1800
Answer: (c)
Question 7: If log 2 = 0.3010 and log 3 = 0.4771, the value of log5 512 is:
(a) 2.967
(b) 2.870
(c) 3.876
(d) 3.912
Answer: (c)
Question 8: An atom’s atomic number is determined by the number of:
(a) Protons
(b) Neutrons minus protons
(c) Electrons
(d) Neutrons
Answer: (a)
Question 9: Current flows in a circuit when
(a) A switch is opened
(b) A switch is closed
(c) The switch is either open or closed
(d) There is no voltage
Answer: (b)
Question 10: A resistor is connected across a 50 V source. What is the current in the resistor if the colour code is red, orange, orange, silver?
(a) 2 mA
(b) 2.2 mA
(c) 214 mA
(d) 21.4 mA
Answer: (b)
Question 11: The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
(a) 1,000 V
(b) 2,000 V
(c) 31.25 V
(d) 3,125 V
Answer: (b)
Question 12: With an RL integrator, at the instant of the rising pulse edge,
(a) All the input voltage is across the resistor
(b) All the input voltage is across the inductor
(c) 63 percent of the input voltage is across the resistor
(d) 63 percent of the input voltage is across the inductor
Answer: (b)
Question 13: In a -connected generator, all of the phase voltages are
(a) Zero
(b) Equal in magnitude
(c) one-third of total
(d) one-sixth of total
Answer: (b)
Question 14: Buzzer in principle is a bell
(a) With hammer
(b) With gong
(c) With both hammer and gong
(d) Without hammer and gong
Answer: (d)
Question 15: If induction motor is direct switched-on then it will develop
(a) 1.5 times their full load torque
(b) 1.5 to 2.5 times their full load torque
(c) 2.5 times their full load torque
(d) 1.5 to 5 times their full load torque
Answer: (b)
Question 16: The ionization gauge an instrument used for the measurement of
(a) Very low pressure
(b) Medium pressure
(c) High pressure
(d) Very high pressure
Answer: (a)
Question 17: What is the purpose of bedding on the underground cables?
(a) To avoid leakage of current.
(b) To protect the sheath against corrosion.
(c) To protect the sheath from mechanical injury due to armouring.
(d) Both (b) and (c)
Answer: (d)
Question 18: What is the source of heat generation in cables?
(a) Copper loss in conductor
(b) Dielectric losses in cable insulation
(c) Losses in metallic sheathings and armoring
(d) All of these
Answer: (d)
Question 19: The commonly used materials for HV insulation is
(a) Paper-oil insulation
(b) Polyester resin
(c) Ceramic
(d) PVC
Answer: (a)
Question 20: The basic difference between square wave and pulse generator is their
(a) Waveforms shape
(b) Duty cycles
(c) Frequency range
(d) Cost
Answer: (b)
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