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CEPTAM 8 Electrical Engineering Exam Sample Paper
(1) Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given temperature. In what ratio should the wires made of these materials be connected in seris os as to have an overall temperature coefficient of 0.002?
(a) 1:2 (b) 2:3 (c) 9:10 (d) 15:16
Ans- (c)
(2) A chopper operating at a fixed frequency is feeding an R-L load. As they duty ratio of the choppe is increased from 25% to 75%, the ripple in the load current.
(a) Remains Constant.
(b) Decreases, reaches a minimum at 50% duty ratio and then increases.
(c) Increases, reaches a maximum at 50% duty ratio and then decreases.
(d) Keeps on increasing as the duty ratio is increased.
Ans- (a)
(3) The resistance of a strip of copper of rectangular cross section is 2 ohms. A metal of resistivity twice that of copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be
(a) 6 Ohms (b) 4/3 Ohms (c) 3/2 Ohms (d) 3/4 Ohms
Ans- (a)
(4) The electric field lines and equipotential lines
(a) Are parallel to each other
(b) Are one and the same.
(c) Cut each other orthogonally
(d) Can be inclined to each other at any angle.
Ans- (c)
(5) The transformed current in a certain branch of circuit is (2s+10)/(s)(s+2). The current has a final value of
(a) 0 (b) 2 (c) 3 (d) 5
Ans- (d)
(6) A transverse electromagnetic wave with circular polarization is received by a dipole antenna. Due to polarization mismatch, the power transfer efficiency from the wave to the antenna is reduced to about
(a) 50% (b)33.3% (c) 25% (d) 0%
Ans- (a)
(7) ‘Creep in energy meters can be prevented by
(a) Using extra turns on the voltage coil
(b) Having two holes on opposite sides of the disc
(c) Using a stronger brake magnet
(d) Using steel laminations of high permeability
Ans-(b)
(8) Top loading is sometimes used with an antenna in order it increase its
(a) Effective height (b) Bandwidth (c) Beam width (d) Input capacitance
Ans-(a)
(9) Which of the following is an example of an open-loop system?
(a) Household refrigerator
(b) Respiratory system of an animal
(c) Stabilization of air pressure entering into a mask
(d) Execution of a program by a computer
Ans-(d)
(10) For an SCR, di/dt protection is achieved through the use of
(a) R in series with SCR
(b) L in series with SCR
(c) RL in series with SCR
(d) RLC in series with SCR
Ans – (b)
(11) In dielectric heating, if the capacitor is loss free, the heat produced will be
(a) Zero
(b) Infinity
(c) Proportional to the value of capacitance
(d) Proportional to the frequency
Ans- (a)
(12) An I/O processor controls the flow of information between
(a) Cache memory and I/O devices.
(b) Main memory and I/O devices
(c) Two I/O devices
(d) Cache and main memories
Ans- (b)
(13) The most toxic pollutant obtained by combustion of coal is
(a) Carbon Dioxide (b) Nitrogen (c) Smoke (d) Hydrogen
Ans- (a)
(14) Semiconductor A has a higher band gap then semiconductor B. If both A and B have the same dimension, the same number of electrons at a given temperature and the same electron and hole motilities, then
(a) A has the same number of holes as B
(b) A has a larger number of holes then B
(c) A has less number of holes then B
(d) Any of the above statements (a),(b) or (c) could be true.
Ans- (b)
(15) A single instruction to clear the lower four bits of the accumulator I 8085 assembly language is
(a) XRI OHF (b) ANI FOH (c) XRI FOH (d) ANI OFH
Ans- (b)
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