List of top Agricultural Engineering and Technology Questions on Electrical Machines

Which of the following types of electric motors is commonly used in applications requiring precise speed control?
In India the primary transmission of electric power is carried through
Given below are two statements:
Statement I: AC generators carry slip rings while DC generators require a commutator
Statement II: Voltage generated in any DC generator is alternating and only becomes DC after it has been rectified by the commutator.
In light of the above statements, choose the most appropriate answer from the options given below
Given below are two statements:
Statement I: The accuracy of null type instruments is higher than that of deflection type instruments
Statement II: Null type instruments are more suitable to dynamic measurements compared to deflection instruments
In light of the above statements, choose the most appropriate answer from the options given below
Five percent increase in supply frequency will change the synchronous speed of motor by
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: DC series motors are suitable for buses, trolleys and trains.
Reason R: DC series motors are variable speed motors.
In light of the above statements, choose the correct answer from the options given below
A single phase 150 V electric motor absorbs 8.0 A while running at 1500 rev/min and developing 2.8 N-m of torque. The phase angle between voltage and current is \(60^\circ\). What is power efficiency of the motor?
Consider the following statements related to electric circuits:
A. Leading and lagging current are phenomena that occur as a result of direct current.
B. In the case of a circuit having only resistances, the voltages and currents are in phase
C. In a purely capacitive circuit, the current will lead the voltage
D. In a purely inductive circuit, the current will lag the voltage
Choose the correct answer from the options given below:
Synchronous Speed of an AC induction motor depends on:
(A) Frequency of the supply voltage
(B) Number of poles
(C) Current
(D) Voltage
Choose the correct answer from the options given below:
Which of the following parts of DC motor can sustain maximum temperature rise?
In an electric circuit, current is directly proportional to electromotive force and inversely proportional to the resistance. This is known as
Transformer is a device used for
In power transmission slip is usually expressed as the percentage of
Which of the following is non-volatile storage?
Efficiency of electric motor can be represented as
The function of transducer is to