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The ratio of voltage and electric current in a closed circuit
(a) remains constant (b) varies (c) increases (d) falls
The resistance of a wire varies inversely as
(a) area of cross section (b) length (c) resistivity (d) temperature
The electrical conductivity of metals is typically of the order of ( in ohm-1 m-1)
(a) 10 to the power of 7 (b) 10 to the power of 5 (c) 10 to the power of -4 (d) 10 to the power of -6
Four resistors, each of resistance R ohms are available. The minimum resistance of the combination will be
(a) 4R (b) R (c) R/4 (d) R/8
The elements which are not capable of delivering energy by its own are known as
(a) unilateral elements (b) non-linear elements (c) passive elements (d) active elements
The magentic susceptibility of paramagnetic material is
(a) less than zero (b) less than one but positive (c) greater than one (d) equal to zero
The Direction of current in an ac circuit
(a) is from positive to negative (b) is always in one direction (c) varies from instant to instant (d)Cannot be determined
which of the following statements associated with purely resistive circuits is correct?
(a) PF is unity (b) Power consumed is zero (c) Heat produced is zero (d) PF is zero
The magnetic field energy in an inductor changes from maximum value to minimum value in in 5m sec when connected to an ac source. The frequency of the source is
(a) 20 Hz (b) 50 Hz (c) 200 Hz (d) 500 Hz

Control Systems:

Electronic control systems have the serious draw-backs of
(a) low reliability (b) operational difficulty (c) temperature sensitiveness (d) all of above
The system whose characteristic equation has the following roots is marginally stable
(a) -j, j, -1,1 (b) -3,-2,0 (c) -2+3j, -2-3j, -2 (d) -3,-2,-1
A phase log compensation will
(a) improve relative stability
(b)increase the speed of response
(c)increase band-width
(d) increase overshoot
For Nyquist plot we use

A system with gain margin close to unity or a phase margin close to zero is

Root locus diagram exhibits the

Increase in the gain K makes the system

The transfer function of a system is used to determine

In a servo system the voltage induced in the control transformer rotor is the

With the feedback system, the transient response

Measurements and Instrumentation

Which of the material is used for the ’swamping’ resistance that is connected in series with the working coil of a voltmeter?

What are used to increase the range of ammeters.

Which voltmeter do you select for measuring 50KV DC?

Which of the following you will prefer to extend the range of an ac voltmeter?

High AC voltages are usually measured with

Creeping is the phenomena occurs in

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