Question 41 : Hydraulic and pneumatic circuits:
1. Perform the same way for all functions
2. Perform differently for all functions
3. Perform the same with some exceptions
4. Does not perform all the functions
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Question 42 : The rotor of a stepper motor has no
1. Windings
2. Commutator
3. Brushes
4. All of the mentioned
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Question 43 : The use of feedback element in the feedback loop is:
1. It converts the output variable 'c' to another suitable feedback variable 'b' to compare with the input command signal.
2. It is the actuating element
3. To increase the stability
4. None of the mentioned
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Question 44 : DC motors are constructed using:
1. Permanent Magnet
2. Electromagnet.
3. Magnets are not used
4. Plastics
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Question 45 : Assertion (A): Pneumatic actuators are not as messy as hydraulic ones.
Reason (R): Pneumatic suffer from leakages and inherent inaccuracies.
1. Both A and R are true and R is correct explanation of A
2. Both A and R are true but R is not correct explanation of A
3. A is true but R is false
4. A is false but R is true
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Question 46 : The chief advantage offered by the electronics is:
1. Differencing and stable amplification by Op-Amp
2. Stable amplification of power level by use of power transistor and SCR's
3. Differencing and stable amplification of power level by Op-Amp
4. No amplification with the Op-Amp
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Question 47 : A single acting cylinder can be pressurized externally from one direction only.
1. True
2. False
3.
4.
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Question 48 : Low power DC and AC motors are also known as _________
1. Servomotors
2. Tachogenerators
3. A.C. generators
4. D.C. generators
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Question 49 : When comparing first cost of hydraulic systems to pneumatic systems, generally they are:
1. More expensive to purchase
2. Less expensive to purchase
3. Cost is same
4. Cost is not required
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Question 50 : A pneumatic symbol is:
1. Different from a hydraulic symbol used for the same function
2. The same as a hydraulic symbol used for the same function
3. Not to be compared to a hydraulic symbol used for the same function
4. None of the mentioned
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