List of top Questions asked in CUET (PG)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A Zener diode is used for voltage regulation. Reason (R) : It maintains a nearly constant voltage in reverse breakdown region. In the light of the above statements, choose the most appropriate answer from the options given below :

AC voltage regulators are widely used in :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Superposition theorem is applicable only to linear circuits. Reason (R) : The response in non-linear circuits is not directly proportional to excitation. In the light of the above statements, choose the most appropriate answer from the options given below :

Which of the element in the following is not bilateral ?

In a Zener diode :

Arrange the following statements :
A. Stator winding is energized with balanced three phase supply
B. Spatially displaced currents create phase shifted fluxes
C. Resultant magnetic field rotates at synchronous speed
D. Rotor conductor cuts the rotating flux
E. Electromagnetic torque is produced Choose the correct answer from the options given below :

In a three phase, 4 pole 50 Hz synchronous machine, if the frequency, pole number and load torque will be halved. The motor speed will be :

In a purely capacitive circuit, if the supply frequency is reduced to \( \frac{1}{4} \), the current will :

Which of the following statement is not correct with respect to short circuit test on transformer ?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A synchronous motor always runs at synchronous speed. Reason (R) : Its rotor speed is locked with the stator rotating magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below :

The power factor of a purely resistive circuit is :

If the field of a synchronous motor is under excited. The power factor will be :

The efficiency of a power transformer is of the order of :

For a R-L-C series circuit under resonance :
A. Current in the circuit is in phase with the applied voltage
B. Voltage drop across capacitor \(C\) and inductor \(L\) are equal in magnitude
C. Voltage across the capacitor is equal in magnitude to the applied voltage
D. Current in the circuit is maximum Choose the correct answer from the options given below :

The transfer impedances at a 2 port network remain constant when the position of excitation and response are interchanged if the network :
A. Is linear
B. Contains bilateral element
C. Has high impedance
D. Is resonant
E. Is non-linear Choose the correct answer from the options given below :

For closed loop control system operation :
A. Controller generates control signal
B. Error signal is produced
C. Output is sensed by sensor
D. Reference input is compared Choose the correct answer from the options given below :

Higher values of ampere-conductors cannot be recommended for synchronous machines as it will cause :
A. Increase in copper loss leading to poor efficiency and temperature rise
B. Increase in synchronous reactance leading to poor inherent voltage regulation
C. Increase in stray load loss
D. Decrease in stray load loss
E. Decrease in synchronous reactance Choose the correct answer from the options given below :

The desired properties of magnetic materials used for electrical machines are :
A. Narrow hysteresis loop to give small hysteresis loss
B. Increased resistivity to give small eddy current loss
C. Free from ageing problem
D. High ductility and free from brittleness
E. High permeability and High saturation flux density Choose the correct answer from the options given below :

For a Three phase alternator, the effect of slot harmonics can be reduced by :
A. Skewing the slots
B. Fractional slot winding
C. Short-chorded winding
D. Distributed winding
E. Increasing the number of poles Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : A Wheatstone bridge is used for precise measurement of Resistance. Reason (R) : It operates on the principle of null deflection. In the light of the above statements, choose the most appropriate answer from the options given below :