Computer Programming MCQs

5739 MCQs  (Page 41 of 574)

Attempt Computer Programming MCQs Quiz
These days D.C. motors are widely used in____________?
A. Pumping sets
B. Air compressors
C. Electric traction
D. Machine shops
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By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
A. Frame
B. Shaft
C. Commutator
D. Stator
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In which of the following applications D.C. series motor is invariably tried?
A. Starter for a car
B. Drive for a water pump
C. Fan motor
D. Motor operation in a.c. or d.c
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In D.C. machines fractional pitch winding is used__________?
A. To improve cooling
B. To reduce copper losses
C. To increase the generated e.m.f.
D. To reduce the sparking
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A three point starter is considered suitable for______________?
A. Shunt motors
B. Shunt as well as compound motors
C. Shunt, compound and series motors
D. All d.c. motors
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In case-the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be______________?
A. 100%
B. Around 90%
C. Anywhere between 75% and 90%
D. Less than 50%
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The ratio of starting torque to full-load torque is least in case of____________?
A. Series motors
B. Shunt motors
C. Compound motors
D. None of the above
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In D.C. motor which of the following can sustain the maximum temperature rise?
A. Slip rings
B. Commutator
C. Field winding
D. Armature winding
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Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?
A. Lenz’s law
B. Faraday’s law
C. Coloumb’s law
D. Fleming’s left-hand rule
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Which of the following load normally needs starting torque more than the rated torque?
A. Blowers
B. Conveyors
C. Air compressors
D. Centrifugal pumps
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Word of the Day
11 Jul
Envisage
contemplate or conceive of as a possibility or a desirable future event.
گمان کرنا، تصور کرنا، سوچنا

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