MAHATRANSCO AE Recruitment 2017- Electrical Quiz 27

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Question 1

Consider the following with regards to graph as shown in the figure given below:

1) Regular graph
2) Connected graph
3) Complete graph
4) Non-regular graph
Which of the above are correct?

• A1 and 4
• B3 and 4
• C2 and 3
• D1 and 2

Question 2

By adding resistance in the rotor circuit of a slip ring induction motor, the starting current

• Aas well as torque reduce
• Bas well as torque increase
• Creduces but the starting torque increases
• Dincrease but the starting torque decreases

Question 3

One of the basic characteristics of any steadystate sinusoidal response of a linear R-L-C circuit with constant R, L and C values is

• Athe output remains sinusodial with its frequency being the same as that of the source
• Bthe output remains sinusoidal with its frequency differing from that of the source
• Cthe output amplitude equals the source amplitude
• Dthe phase angle difference between the source and the output is always zero.

Question 4

The duration of the transient period in a control system is referred to as:

• Asettling time
• Btransient time
• Ctracking time
• Dconstant time

Question 5

A proportional integral (PI) controller results in which of the following?

• AImproves the transient response without affecting steady state response
• BImproves the steady state response without affecting transient response
• CImproves both transient response and steady state response
• DImproves the steady state response while marginally affecting transient response, for well designed control parameters.

Question 6

A third order system is approximated to an equivalent second order system. The rise time of this approximated system will be.

• ASame as the original system for any input
• BSmaller then he original system for any input
• CLarger than the original system for any input
• DSmaller or larger depending on the type of input.

Question 7

The instrument servomechanism is actually an instrument system made of components, which are

• AExclusively passive transducers
• BExclusively active transducers
• CCombination of passive transducers and active transducers
• DExclusively primary sensing elements

Question 8

Which of the following statements is not correct for thermistors?

• AThey have negative temperature coefficient of resistance.
• BThe sensing element is made of sintered ceramics, which are oxides of metals in the form of beads.
• CThe variation of resistance with temperature is linear.
• DThe resistance value at ambient temperature may range from 100Ω to 100 kΩ.

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