Summarize the following court judgment. ivil Appeal No. 1466 of 1987. From the Judgment and Order dated 8.12.1986 of the Calcutta High Court in Matter No. 1636 of 1985. A.K. Sen	 Shanker Kumar Ghosh and D.P. Mukherjee for the Appellant. S.N. Kacker and G.S. Chatterjee for the Respondents. The Judgment of the Court was delivered by SABYASACHI MUKHARJI	 J. Special leave granted. this is an application challenging the order of the learned single judge dated the 8th December	 1986 of the High Court of Calcutta. By the impugned judgment the said learned Judge has set aside the order dated the 19th April	 1983 of anoth er learned single judge on the ground	 inter alia	 that the first learned Judge	 when she passed the order	 acted with out 571 jurisdiction. There was an arbitration agreement. Clause 25 of the said Agreement	 inter alia	 was as follows: "except where otherwise provided in the contract all questions of disputes relating to the granting of specifications	 designs	 drawings and instructions hereinbefore mentioned and as to the quality of workmanship and materials used in the work or as to any question claims	 rights	 matters	 or things whatsoever in any way arising out of or relating to the contract	 designs	 drawings	 specifications	 estimates	 instructions orders or these conditions or otherwise concerning the work or execution or failure to execute the same where arising during the progress of the work or after completion or abandonment thereof was to be referred to sole arbitration of the Director/Unit Head	 C.M.D.A. not connected with the particular work as may be appointed by the authority. The award of the arbitrator shall be final	 conclusive and binding on all the parties to the contract. " On that basis the appellant had moved an application for removal of the named arbitrator before the first learned Judge which came up for hearing on 19th April	 1983 and this was by filing of an application under Section 20 of the for an order for filing the arbitration agreement	 for appointment of an arbitrator and for other consequential reliefs. By the order	dated 19.4.83 the said learned Judge has recorded the facts of this case and fur ther recorded that by virtue of the Clause 25 of the agree ment the appellant herein and prayed for appointment of an arbitrator for determination of the dispute that had arisen which had been set out in paragraph 15 of the petition. Inasmuch as according to the appellant the directors of all the units of Calcutta Metropolitan Development Authority had already expressed their opinion in respect of the disputes that had arisen between the appellant and the respondent and inasmuch as by the Central Tender Committee	 the directors were members. Under the circumstances the appellant appre hended that the appellant might not get justice or proper relief under such circumstances. There was reasonable basis of the apprehension against the unnamed arbitrator	 and it was urged that instead of appointing any officer of the respondent as arbitrator an independent member of the Bar be appointed as arbitrator. The learned Judge passed such order on 19th April	 1983 while recording these facts as alleged by the petitioner. These appear to have been reasons for appointing Sri Amitav Guha as the arbitrator in this case in terms of prayer (c) of the said petition. 572 The learned judge in the impugned order has observed that the Court was bound to enforce the particular agreement with which the parties came to the Court	 and the parties were not entitled to have any fresh opportunity to appoint a new arbitrator as that would amount to a new agreement between the parties. This position is good in so far as it goes. But that does not solve the problem in all situations. The learned Judge also observed that no appointment can be made by the Court on the ground of disqualification of the arbitrator without having proper materials on record and without coming to a definite finding on this point. The learned Judge further observed that the Court either should have given effect to the agreed machinery for appointment of the arbitrator or it could have appointed afresh after coming to a clear finding that all directors of the Unit of C.M.D.A. were biased against the appellant herein as well as they had rendered themselves disqualified from being ap pointed as arbitrators. Until all of them were found dis qualified	 the Court did not have the jurisdiction to ap point any new one and had to follow the correct machinery. It appears that the first learned Judge has in fact held that the arbitrator named had disqualified himself on the ground of bias and on that basis	 appointed an outside Advocate	 Shri Amitav Guha as the arbitrator. If the re spondents were not satisfied they could have moved an appeal against the order; instead respondents participated in the arbitration proceedings and acquiesced in such appointment. The order was made on 19.4.83 appointing Shri Amitav Guha an advocate of the Calcutta High Court as sole Arbitrator. The arbitrator appointed	 started arbitration proceedings in which both the parties submitted to his jurisdiction and filed their respective claims and other documents in support thereof. It appears from the List of Dates submitted before us that respondent No. 1 moved three interlocutory applica tions at different points of time which were	 however	 disposed of with orders in favour of the appellant. Both parties got extention of the arbitration proceedings even by Hon 'ble Mrs. Justice Pratibha Bonnerjea at least 14 times and the last extention was granted upto November	 1985 by Justice Mrs. Bonnerjea. In the meantime the said Arbitrator had held 74 sittings which were attended by the parties of both sides and their counsel. A large amount of time and money	 same at the cost of public have been spent on these. In the year 1985 the respondent No. 1 challenged the validity of the order of appointment of arbitrator passed by first learned judge Where she acted on the basis of the findings mentioned hereinbefore. Can a party be permitted to do that? In Arbn. Jupiter Gener al 573 Insce. Co. Ltd. vs Corporation of Calcutta	 at 472) P.B. Mukherji	 J. as the learned Chief Justice then was observed: "It is necessary to state at the outset that Courts do not favour this kind of contention and conduct of an applicant who participates in arbitration proceedings without protest and fully avails of the entire arbitration proceedings and then when he sees that the award has gone against him he comes forward to challenge the whole of the arbitration proceedings and without jurisdiction on the ground of a known disability of a party. That view of the Court is ably stated by the Editor of the 15th Edition of Russell on the Law of Arbitration at page 295 in the following terms: 'Although a party may by reason of some disability be legally incapable of submitting matters to arbitration that fact is not one that can be raised as a ground for disputing the award by other parties to a reference who were aware of the disability. If one of the parties is incapable the objection should be taken to the submission. A party will not be permitted to lie by & join in the submission and then if it suits its purpose attack the award on the ground. The presumption in the absence of proof to the contrary will be that the party complaining was aware of the disability when the submission was made. '" Mr. Kacker submitted that this principle could be in voked only in a situation where the challenge is made only after the making of an award	 and not before. We are unable to accept this differentiation. The principle is that a party shall not be allowed to blow hot and cold simultane ously. Long participation and acquiescence in the proceeding preclude such a party from contending that the proceedings were without jurisdiction. Russell on Arbitration	 18th Edition	page 105 explains the position as follows: "If the parties to the reference either agree beforehand to the method of appointment	 or afterwards acquiescence in the appointment made	 with full knowledge of all the circum stances	 they will be precluded from objecting to such appointment as invalidating subsequent proceedings. 574 Attending and taking part in the proceedings with full knowledge of the relevant	 fact will amount to such acquiescence." The Judicial Committee in decision in Chowdhury Murtaza Hossein vs Mussumat Bibi Bechunnissa	 (31.A. 209) observed at page 220: "On the whole	 therefore	 their Lordships think that the appellant	 having a clear knowledge of the circumstances on which he might have founded an objection to the arbitrators proceedings to make their awards	 did submit to the arbitration going on; that he allowed the arbitrators to deal with the case as is stood before them	 taking his chance of the decision being more or less favourable to himself; and that is too late for him	 after the award has been made	 and on the application to file the award	 to insist on this objection to the filing of the award. " Relying on the aforesaid observations this Court in N. Chellappan vs Secretary	 Kerala State Electricity Board and Another	 ; 	 acted upon the principle that acquiescence defeated the right of the applicant at a later stage. In that case the facts were similar. It was held by conduct there was acquiscence. Even in a case where initial order was not passed by consent of the parties a party by participation and acquiescence can preclude future chal lenges. In the grounds of appeal no prejudice has been indicated by the appointment of the second arbitrator. Mr. S.N. Kacker	 learned counsel for the respondents drew our attention to the fact that the decision in the Chowdhuri Murtaza Hossein 's case was where the party chal lenged the appointment of the receiver after the award was made. He also submits that in this case the respondents herein had challenged the order of appointment of the arbi trator on 19.4.83 and not after the arbitrator had made the award. We are unable to accept this distinction. Basically the principle of waiver and estoppel is not only applicable where the award had been made but also where a party to the proceeding challenges the proceedings in which he partici pated. In the facts of this case	 there was no demur but something which can be called acquiescence on the part of the respondents which precludes them from challenging the participation. 575 In that view of the matter	 we are of the opinion that the judgment and impugned order cannot be sustained. In the premises the appeal is allowed. The order and judgment of the High Court dated the 8th December	 1986 are set aside. The arbitration proceedings will go on before the Arbitrator appointed by order dated 19th April	 1983. Time for making the award is extended for four months from today. For fur ther extention of time the party may apply to the High Court of Calcutta. The appeal is disposed of accordingly. The parties will bear their respective costs. P.S.S. Appeal allowed.

Clause 24 of the arbitration agreement between the parties provided for reference of all questions of dispute arising under the contract to the sole arbitration of the Director/Unit Heads of the respondent Authority	 not con nected with the particular work. All such officers having already expressed their opinion in respect of the disputes that had arisen	 the appellant apprehended that he may not get justice or proper relief. He	 therefore	 moved an appli cation under section 20 of the for appointment of an independent member of the bar as arbitrator instead of the named officer of the respondent Authority. A Single Judge of the High Court held that the arbitra tor named had disqualified himself on the ground of bias and appointed an outside advocate as the sole arbitrator on April 19	 1983. When arbitration proceedings commenced both the parties submitted to his jurisdiction and filed their respective claims and documents. Upto November 1985 the said arbitrator held 74 sittings which were attended by the parties of both sides and their counsel. Respondent No. 1 had moved three interlocutory applications. Both the parties got extension of arbitration proceedings at least 4 times upto November 1985. Respondent No. 1 challenged the validity of the order of appointment of arbitrator dated April 19	 1983 in the year 1985	 when another Single Judge took the view that if the court was bound to enforce the particular agreement with which the parties came to the court	 the parties were not entitled to have any fresh opportunity to appoint a new arbitrator as that would amount to a new agreement between the parties. He further observed that no appointment can be made by the Court on the ground of disqualification of the arbitrator without having proper materials on record and without coming to a definite finding on this point. Until then the Court did not have the jurisdiction to appoint 570 any new arbitrator and had to follow the correct machinery. This order of the Single Judge dated December 8	 1986 set ting aside the earlier order dated April 19	 1983 was as sailed in the appeal by special leave. Allowing the appeal	 this Court	 HELD: Long participation and acquiescence in arbitration proceedings preclude a party from contending that the pro ceedings were without jurisdiction. The principle is that a party shall not be allowed to blow hot and cold simultane ously. [573F] Basically the principle of Waiver and estoppel is not only applicable where the award had been made but also where a party challenges the proceedings in which he participated. In the instant case	 there was no demur but something which can be called acquiescence on the part of the respondents or which precludes them from challenging the participation. [574G H] Arbn. Jupiter General Insce. Co. Ltd. vs Corporation of Calcutta	 at 472; Chowdhury Murtaza Hossein vs Mussumat Bibi Bechunnissa	 3 I.A. 209; N. Chel lappan vs Secretary	 Kerala State Electricity Board & Anr.	 ; and Russel on Arbitration	 18th Edn. p. 105	 referred to.